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    F E A T U R E S TO220 (KC) PACKAGE(TOP VIEW)

    1

    2

    3

    4

    5

    EN

    INGND

    OUTPUT

    FB/PG

    1

    TO263 (KTT) PACKAGE

    (TOP VIEW)

    2

    3

    4

    5

    EN

    IN

    GND

    OUTPUT

    FB/PG

    D E S C R I P T I O N

    TJ Junction Temperature C

    40 35 11050

    DropoutVoltagemV

    VD

    O

    TPS75933

    DROPOUT VOLTAGEvs

    JUNCTION TEMPERATURE600

    125

    500

    400

    300

    200

    100

    0

    IO = 7.5 A

    25 10 5 20 65 9580

    t Time s

    TPS75915

    LOAD TRANSIENT RESPONSE

    I

    OutputCurrentA

    O

    200

    0

    0 604020 80 100 140120 160 180 200

    0

    100

    100

    VO= 1.5 V

    Co= 100 F

    10

    5

    200

    didt+

    1 Ams

    VO

    ChangeinOutputVoltagemV

    T P S 7 5 9 0 1 , T P S 7 5 9 1 5 T P S 7 5 9 1 8 , T P S 7 5 9 2 5 , T P S 7 5 9 3 3

    S L V S 3 1 8 E D E C E M B E R 2 0 0 0 R E V I S E D M A R C H 2 0 0 4

    P O W E R G O O D F A S T - T R A N S I E N T R E S P O N S E 7 . 5 - A

    L O W - D R O P O U T V O L T A G E R E G U L A T O R S

    7 . 5 - A L o w - D r o p o u t V o l t a g e R e g u l a t o r

    A v a i l a b l e i n 1 . 5 - V , 1 . 8 - V , 2 . 5 - V , a n d 3 . 3 - V F i x e d - O u t p u t a n d A d j u s t a b l e V e r s i o n s

    O p e n D r a i n P o w e r - G o o d ( P G ) S t a t u s O u t p u t ( F i x e d O p t i o n s O n l y )

    D r o p o u t V o l t a g e T y p i c a l l y 4 0 0 m V a t 7 . 5 A ( T P S 7 5 9 3 3 )

    L o w 1 2 5 A T y p i c a l Q u i e s c e n t C u r r e n t

    F a s t T r a n s i e n t R e s p o n s e

    3 % T o l e r a n c e O v e r S p e c i f i e d C o n d i t i o n s f o r

    F i x e d - O u t p u t V e r s i o n s A v a i l a b l e i n 5 - P i n T O - 2 2 0 a n d T O - 2 6 3

    S u r f a c e - M o u n t P a c k a g e s

    T h e r m a l S h u t d o w n P r o t e c t i o n

    T h e T P S 7 5 9 x x f a m i l y o f 7 . 5 - A l o w d r o p o u t ( L D O ) r e g u l a t o r s c o n t a i n s f o u r f i x e d v o l t a g e o p t i o n r e g u l a t o r s w i t h i n t e g r a t e d p o w e r - g o o d ( P G ) a n d a n a d j u s t a b l e v o l t a g e o p t i o n r e g u l a t o r . T h e s e d e v i c e s a r e c a p a b l e o f s u p p l y i n g 7 . 5 A o f o u t p u t c u r r e n t w i t h a d r o p o u t o f 4 0 0 m V ( T P S 7 5 9 3 3 ) . T h e r e f o r e , t h e d e v i c e s a r e c a p a b l e o f p e r f o r m i n g a 3 . 3 - V t o 2 . 5 - V c o n v e r s i o n . Q u i e s c e n t c u r r e n t i s 1 2 5 A a t f u l l l o a d a n d d r o p s b e l o w 1 0 A w h e n t h e d e v i c e s a r e d i s a b l e d . T h e T P S 7 5 9 x x i s d e s i g n e d t o h a v e f a s t t r a n s i e n t r e s p o n s e f o r l a r g e l o a d c u r r e n t c h a n g e s .

    P l e a s e b e a w a r e t h a t a n i m p o r t a n t n o t i c e c o n c e r n i n g a v a i l a b i l i t y , s t a n d a r d w a r r a n t y , a n d u s e i n c r i t i c a l a p p l i c a t i o n s o f T e x a s I n s t r u m e n t s s e m i c o n d u c t o r p r o d u c t s a n d d i s c l a i m e r s t h e r e t o a p p e a r s a t t h e e n d o f t h i s d a t a s h e e t .

    P o w e r P A D i s a t r a d e m a r k o f T e x a s I n s t r u m e n t s .

    P R O D U C T I O N D A T A i n f o r m a t i o n i s c u r r e n t a s o f p u b l i c a t i o n d a t e . C o p y r i g h t 2 0 0 0 2 0 0 4 , T e x a s I n s t r u m e n t s I n c o r p o r a t e d P r o d u c t s c o n f o r m t o s p e c i f i c a t i o n s p e r t h e t e r m s o f t h e T e x a s I n s t r u m e n t s s t a n d a r d w a r r a n t y . P r o d u c t i o n p r o c e s s i n g d o e s n o t n e c e s s a r i l y i n c l u d e t e s t i n g o f a l l p a r a m e t e r s .

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    (1) See application information section for capacitor selection details.

    PG

    OUT

    2

    1

    IN

    EN

    GND

    3

    5

    4

    VI PG

    VO

    47 F+

    Co(1)

    1 F

    T P S 7 5 9 0 1 , T P S 7 5 9 1 5 T P S 7 5 9 1 8 , T P S 7 5 9 2 5 , T P S 7 5 9 3 3 S L V S 3 1 8 E D E C E M B E R 2 0 0 0 R E V I S E D M A R C H 2 0 0 4

    B e c a u s e t h e P M O S d e v i c e b e h a v e s a s a l o w - v a l u e r e s i s t o r , t h e d r o p o u t v o l t a g e i s v e r y l o w ( t y p i c a l l y 4 0 0 m V a t a n o u t p u t c u r r e n t o f 7 . 5 A f o r t h e T P S 7 5 9 3 3 ) a n d i s d i r e c t l y p r o p o r t i o n a l t o t h e o u t p u t c u r r e n t . A d d i t i o n a l l y , s i n c e t h e P M O S p a s s e l e m e n t i s a v o l t a g e - d r i v e n d e v i c e , t h e q u i e s c e n t c u r r e n t i s v e r y l o w a n d i n d e p e n d e n t o f o u t p u t l o a d i n g ( t y p i c a l l y 1 2 5 A o v e r t h e f u l l r a n g e o f o u t p u t c u r r e n t , 1 m A t o 7 . 5 A ) . T h e s e t w o k e y s p e c i f i c a t i o n s y i e l d a s i g n i f i c a n t i m p r o v e m e n t i n o p e r a t i n g l i f e f o r b a t t e r y - p o w e r e d s y s t e m s .

    T h e d e v i c e i s e n a b l e d w h e n E N i s c o n n e c t e d t o a l o w - l e v e l v o l t a g e . T h i s L D O f a m i l y a l s o f e a t u r e s a s l e e p m o d e ;

    a p p l y i n g a T T L h i g h s i g n a l t o E N ( e n a b l e ) s h u t s d o w n t h e r e g u l a t o r , r e d u c i n g t h e q u i e s c e n t c u r r e n t t o l e s s t h a n 1 A a t T J = 2 5C . T h e p o w e r - g o o d t e r m i n a l ( P G ) i s a n a c t i v e l o w , o p e n d r a i n o u t p u t , w h i c h c a n b e u s e d t o i m p l e m e n t a p o w e r - o n r e s e t o r a l o w - b a t t e r y i n d i c a t o r .

    T h e T P S 7 5 9 x x i s o f f e r e d i n 1 . 5 - V , 1 . 8 - V , 2 . 5 - V , a n d 3 . 3 - V f i x e d - v o l t a g e v e r s i o n s a n d i n a n a d j u s t a b l e v e r s i o n ( p r o g r a m m a b l e o v e r t h e r a n g e o f 1 . 2 2 V t o 5 V ) . O u t p u t v o l t a g e t o l e r a n c e i s s p e c i f i e d a s a m a x i m u m o f 3 % o v e r l i n e , l o a d , a n d t e m p e r a t u r e r a n g e s . T h e T P S 7 5 9 x x f a m i l y i s a v a i l a b l e i n a 5 - p i n T O - 2 2 0 ( K C ) a n d T O - 2 6 3 ( K T T ) p a c k a g e s .

    A V A I L A B L E O P T I O N S

    O U T P U T V O L T A G E T O - 2 2 0 T O - 2 6 3 TJ ( T Y P ) ( K C ) ( K T T ) ( 1 )

    3 . 3 V T P S 7 5 9 3 3 K C T P S 7 5 9 3 3 K T T

    2 . 5 V T P S 7 5 9 2 5 K C T P S 7 5 9 2 5 K T T

    - 4 0C t o 1 2 5 C 1 . 8 V T P S 7 5 9 1 8 K C T P S 7 5 9 1 8 K T T

    1 . 5 V T P S 7 5 9 1 5 K C T P S 7 5 9 1 5 K T T

    A d j u s t a b l e 1 . 2 2 V t o 5 V T P S 7 5 9 0 1 K C T P S 7 5 9 0 1 K T T

    ( 1 ) T h e T P S 7 5 9 0 1 i s p r o g r a m m a b l e u s i n g a n e x t e r n a l r e s i s t o r d i v i d e r ( s e e a p p l i c a t i o n i n f o r m a t i o n ) . A d d T f o r K T T d e v i c e s i n 5 0 - p i e c e r e e l . A d d R f o r K T T d e v i c e s i n 5 0 0 - p i e c e r e e l .

    F i g u r e 1 . T y p i c a l A p p l i c a t i o n C o n f i g u r a t i o n ( F o r F i x e d O u t p u t O p t i o n s )

    T e r m i n a l F u n c t i o n s ( T P S 7 5 9 x x )

    T E R M I N A L I / O D E S C R I P T I O N

    N A M E N O .

    E N 1 I E n a b l e i n p u t F B / P G 5 I / O F e e d b a c k i n p u t v o l t a g e f o r a d j u s t a b l e d e v i c e / P G o u t p u t f o r f i x e d o p t i o n s

    G N D 3 R e g u l a t o r g r o u n d

    I N 2 I I n p u t v o l t a g e

    O U T P U T 4 O R e g u l a t e d o u t p u t v o l t a g e

    2

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    _ +

    Thermal

    Shutdown

    Bandgap

    ReferenceVIN

    Current

    Sense

    R2

    VIN

    GND

    EN

    VOUT

    SHUTDOWN

    Vref=1.22V

    UVLO

    ILIM

    External to

    the Device

    FB

    R1

    UVLO

    _ +

    Thermal

    Shutdown

    Falling

    Edge Delay

    VIN

    Current

    Sense

    R1

    R2

    VIN

    GND

    EN

    VOUT

    PG

    SHUTDOWN

    Vref=1.22V

    UVLO

    ILIM

    Bandgap

    Reference

    UVLO

    T P S 7 5 9 0 1 , T P S 7 5 9 1 5 T P S 7 5 9 1 8 , T P S 7 5 9 2 5 , T P S 7 5 9 3 3

    S L V S 3 1 8 E D E C E M B E R 2 0 0 0 R E V I S E D M A R C H 2 0 0 4

    F U N C T I O N A L B L O C K D I A G R A M - A D J U S T A B L E V E R S I O N

    F U N C T I O N A L B L O C K D I A G R A M - F I X E D V E R S I O N

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    T P S 7 5 9 x x P G T I M I N G D I A G R A M

    NOTE A: VIT Trip voltage is typically 9% lower than the output voltage (91%VO) VITto VIT+ is the hysteresis voltage.

    t

    t

    t

    Threshold

    Voltage

    PG

    Output

    VIT+(see Note A)

    VIN1

    VOUT

    VIT(see Note A)

    VUVLOVUVLO

    D E T A I L E D D E S C R I P T I O N

    P I N F U N C T I O N S

    E n a b l e ( E N )

    P o w e r - G o o d ( P G )

    F e e d b a c k ( F B )

    T P S 7 5 9 0 1 , T P S 7 5 9 1 5 T P S 7 5 9 1 8 , T P S 7 5 9 2 5 , T P S 7 5 9 3 3 S L V S 3 1 8 E D E C E M B E R 2 0 0 0 R E V I S E D M A R C H 2 0 0 4

    T h e T P S 7 5 9 x x f a m i l y i n c l u d e s f o u r f i x e d - o u t p u t v o l t a g e r e g u l a t o r s ( 1 . 5 V , 1 . 8 V , 2 . 5 V , a n d 3 . 3 V ) , a n d a n a d j u s t a b l e r e g u l a t o r , t h e T P S 7 5 9 0 1 ( a d j u s t a b l e f r o m 1 . 2 2 V t o 5 V ) . T h e b a n d g a p v o l t a g e i s t y p i c a l l y 1 . 2 2 V .

    T h e E N t e r m i n a l i s a n i n p u t w h i c h e n a b l e s o r s h u t s d o w n t h e d e v i c e . I f E N i s a l o g i c h i g h , t h e d e v i c e w i l l b e i n s h u t d o w n m o d e . W h e n E N g o e s t o l o g i c l o w , t h e n t h e d e v i c e w i l l b e e n a b l e d .

    T h e P G t e r m i n a l f o r t h e f i x e d v o l t a g e o p t i o n d e v i c e s i s a n o p e n d r a i n , a c t i v e l o w o u t p u t t h a t i n d i c a t e s t h e s t a t u s o f VO ( o u t p u t o f t h e L D O ) . W h e n V Or e a c h e s a p p r o x i m a t e l y 9 1 % o f t h e r e g u l a t e d v o l t a g e , P G w i l l g o t o a l o w i m p e d a n c e s t a t e . I t w i l l g o t o a h i g h - i m p e d a n c e s t a t e w h e n V O f a l l s b e l o w 9 1 % ( i . e . , o v e r l o a d c o n d i t i o n ) o f t h e r e g u l a t e d v o l t a g e . T h e o p e n d r a i n o u t p u t o f t h e P G t e r m i n a l r e q u i r e s a p u l l u p r e s i s t o r .

    F B i s a n i n p u t t e r m i n a l u s e d f o r t h e a d j u s t a b l e - o u t p u t o p t i o n a n d m u s t b e c o n n e c t e d t o t h e o u t p u t t e r m i n a l e i t h e r

    d i r e c t l y , i n o r d e r t o g e n e r a t e t h e m i n i m u m o u t p u t v o l t a g e o f 1 . 2 2 V , o r t h r o u g h a n e x t e r n a l f e e d b a c k r e s i s t o r d i v i d e r f o r o t h e r o u t p u t v o l t a g e s . T h e F B c o n n e c t i o n s h o u l d b e a s s h o r t a s p o s s i b l e . I t i s e s s e n t i a l t o r o u t e i t i n s u c h a w a y t o m i n i m i z e / a v o i d n o i s e p i c k u p . A d d i n g R C n e t w o r k s b e t w e e n F B t e r m i n a l a n d V O t o f i l t e r n o i s e i s n o t r e c o m m e n d e d b e c a u s e i t m a y c a u s e t h e r e g u l a t o r t o o s c i l l a t e .

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    I n p u t V o l t a g e ( I N )

    O u t p u t V o l t a g e ( O U T P U T )

    A B S O L U T E M A X I M U M R A T I N G S

    D I S S I P A T I O N R A T I N G T A B L E

    R E C O M M E N D E D O P E R A T I N G C O N D I T I O N S

    T P S 7 5 9 0 1 , T P S 7 5 9 1 5 T P S 7 5 9 1 8 , T P S 7 5 9 2 5 , T P S 7 5 9 3 3

    S L V S 3 1 8 E D E C E M B E R 2 0 0 0 R E V I S E D M A R C H 2 0 0 4

    T h e V I N t e r m i n a l i s a n i n p u t t o t h e r e g u l a t o r .

    T h e V O U T P U T t e r m i n a l i s a n o u t p u t t o t h e r e g u l a t o r .

    o v e r o p e r a t i n g j u n c t i o n t e m p e r a t u r e r a n g e ( u n l e s s o t h e r w i s e n o t e d ) ( 1 )

    T P S 7 5 9 X X

    I n p u t v o l t a g e r a n g e ( 2 ) VI - 0 . 3 V t o 6 V

    V o l t a g e r a n g e a t E N - 0 . 3 V t o 6 V

    M a x i m u m P G v o l t a g e ( T P S 7 5 9 x x ) 6 V

    P e a k o u t p u t c u r r e n t I n t e r n a l l y l i m i t e d

    C o n t i n u o u s t o t a l p o w e r d i s s i p a t i o n S e e D i s s i p a t i o n R a t i n g T a b l e

    O u t p u t v o l t a g e V O ( O U T P U T , F B ) 5 . 5 V

    O p e r a t i n g j u n c t i o n t e m p e r a t u r e r a n g e T J

    - 4 0C t o 1 5 0 C

    S t o r a g e t e m p e r a t u r e r a n g e T s t g - 6 5C t o 1 5 0 C

    E S D r a t i n g H B M 2 k V

    C D M 5 0 0 V

    ( 1 ) S t r e s s e s b e y o n d t h o s e l i s t e d u n d e r a b s o l u t e m a x i m u m r a t i n g s m a y c a u s e p e r m a n e n t d a m a g e t o t h e d e v i c e . T h e s e a r e s t r e s s r a t i n g s o n l y , a n d f u n c t i o n a l o p e r a t i o n o f t h e d e v i c e a t t h e s e o r a n y o t h e r c o n d i t i o n s b e y o n d t h o s e i n d i c a t e d u n d e r r e c o m m e n d e d o p e r a t i n g c o n d i t i o n s i s n o t i m p l i e d . E x p o s u r e t o a b s o l u t e - m a x i m u m - r a t e d c o n d i t i o n s f o r e x t e n d e d p e r i o d s m a y a f f e c t d e v i c e r e l i a b i l i t y .

    ( 2 ) A l l v o l t a g e v a l u e s a r e w i t h r e s p e c t t o n e t w o r k t e r m i n a l g r o u n d .

    P A C K A G E R J C (C / W ) R J A (C / W ) ( 1 )

    T O - 2 2 0 2 5 8 . 7 ( 2 )

    T O - 2 6 3 2 3 8 . 7

    ( 3 )

    ( 1 ) F o r b o t h p a c k a g e s , t h e R J Av a l u e s w e r e c o m p u t e d u s i n g J E D E C h i g h K b o a r d ( 2 S 2 P ) w i t h 1 o u n c e i n t e r n a l c o p p e r p l a n e a n d g r o u n d p l a n e . T h e r e w a s n o a i r f l o w a c r o s s t h e p a c k a g e s .

    ( 2 ) R J A w a s c o m p u t e d a s s u m i n g a v e r t i c a l , f r e e s t a n d i n g T O - 2 2 0 p a c k a g e w i t h p i n s s o l d e r e d t o t h e b o a r d . T h e r e i s n o h e a t s i n k a t t a c h e d t o t h e p a c k a g e .

    ( 3 ) R J A w a s c o m p u t e d a s s u m i n g a h o r i z o n t a l l y m o u n t e d T O - 2 6 3 p a c k a g e w i t h p i n s s o l d e r e d t o t h e b o a r d . T h e r e i s n o c o p p e r p a d u n d e r n e a t h t h e p a c k a g e .

    M I N M A X U N I T

    VI( 1 ) I n p u t v o l t a g e 2 . 8 5 . 5 V

    VO O u t p u t v o l t a g e r a n g e 1 . 2 2 5 V

    I O O u t p u t c u r r e n t 0 7 . 5 A

    TJ O p e r a t i n g v i r t u a l j u n c t i o n t e m p e r a t u r e - 4 0 1 2 5 C

    ( 1 ) T o c a l c u l a t e t h e m i n i m u m i n p u t v o l t a g e f o r y o u r m a x i m u m o u t p u t c u r r e n t , u s e t h e f o l l o w i n g e q u a t i o n : V I ( m i n ) = VO ( m a x ) + VD O ( m a x l o a d ) .

    5

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    Line regulator (mV) + (%V) VOVImax * 2.8V

    100 1000

    Line regulator (mV) + (%V) VOVImax * VO ) 1V

    100 1000

    E L E C T R I C A L C H A R A C T E R I S T I C S

    T P S 7 5 9 0 1 , T P S 7 5 9 1 5 T P S 7 5 9 1 8 , T P S 7 5 9 2 5 , T P S 7 5 9 3 3 S L V S 3 1 8 E D E C E M B E R 2 0 0 0 R E V I S E D M A R C H 2 0 0 4

    o v e r r e c o m m e n d e d o p e r a t i n g j u n c t i o n t e m p e r a t u r e r a n g e ( T J = - 4 0 C t o 1 2 5 C ) , V I = VO ( t y p ) + 1 V , I O = 1 m A , E N = 0 V , CO = 1 0 0 F ( u n l e s s o t h e r w i s e n o t e d )

    P A R A M E T E R T E S T C O N D I T I O N S M I N T Y P M A X U N I T

    1 . 2 2 V VO 5 . 5 V , T J = 2 5C VO

    1 . 2 2 V VO 5 . 5 V 0 . 9 7 V O 1 . 0 3 V OA d j u s t a b l e v o l t a g e V 1 . 2 2 V VO 5 . 5 V , T J = 0 t o 0 . 9 8 V O 1 . 0 2 V O1 2 5C ( 2 )

    TJ = 2 5C , 2 . 8 V < V I < 5 . 5 V 1 . 5 1 . 5 V O u t p u t

    2 . 8 V VI 5 . 5 V 1 . 4 5 5 1 . 5 4 5 VO u t p u t v o l t a g e ( 1 )

    TJ = 2 5C , 2 . 8 V < V I < 5 . 5 V 1 . 8 1 . 8 V O u t p u t

    2 . 8 V VI 5 . 5 V 1 . 7 4 6 1 . 8 5 4

    TJ = 2 5C , 3 . 5 V < V I < 5 . 5 V 2 . 5 2 . 5 V O u t p u t V

    3 . 5 V VI 5 . 5 V 2 . 4 2 5 2 . 5 7 5

    TJ = 2 5C , 4 . 3 V < V I < 5 . 5 V 3 . 3 3 . 3 V O u t p u t V

    4 . 3 V VI 5 . 5 V 3 . 2 0 1 3 . 3 9 9

    TJ = 2 5C 1 2 5 Q u i e s c e n t c u r r e n t ( G N D c u r r e n t ) ( 3 ) , ( 4 ) A

    2 0 0

    VO + 1 V VI 5 . 5 V , T J = 2 5C 0 . 0 4 O u t p u t v o l t a g e l i n e r e g u l a t i o n ( VO/ VO)

    ( 4 ) % / VVO + 1 V VI < 5 . 5 V 0 . 1

    L o a d r e g u l a t i o n ( 3 ) 0 . 3 5 % / V

    B W = 3 0 0 H z t o 5 0 k H z , T J = 2 5C ,O u t p u t n o i s e v o l t a g e T P S 7 5 9 1 5 3 5 V r m s VI = 2 . 8 V

    O u t p u t c u r r e n t l i m i t V O = 0 V 8 1 0 1 4 A

    T h e r m a l s h u t d o w n j u n c t i o n t e m p e r a t u r e 1 5 0 C

    E N = V I , TJ = 2 5C 0 . 1 A S t a n d b y c u r r e n t

    E N = V I 1 0 A

    F B i n p u t c u r r e n t T P S 7 5 9 0 1 F B = 1 . 5 V - 1 1 A

    P o w e r s u p p l y r i p p l e r e j e c - f = 1 0 0 H z , T J = 2 5C , VI = 2 . 8 V , T P S 7 5 9 1 5 5 8 d B t i o n I O = 7 . 5 A

    M i n i m u m i n p u t v o l t a g e f o r v a l i d P G I O ( P G ) = 3 0 0 A , V ( P G ) 0 . 8 V 0 V

    P G t r i p t h r e s h o l d v o l t a g e F i x e d o p t i o n s o n l y V O d e c r e a s i n g 8 9 9 3 % V O

    P G h y s t e r e s i s v o l t a g e F i x e d o p t i o n s o n l y M e a s u r e d a t V O 0 . 5 % V O

    P G o u t p u t l o w v o l t a g e F i x e d o p t i o n s o n l y V I = 2 . 8 V , I O ( P G ) = 1 m A 0 . 1 5 0 . 4 V

    P G l e a k a g e c u r r e n t F i x e d o p t i o n s o n l y V ( P G ) = 5 V 1 A

    E N = V I - 1 1 A I n p u t c u r r e n t ( E N )

    E N = 0 V - 1 0 1 A

    H i g h l e v e l E N i n p u t v o l t a g e 2 V

    L o w l e v e l E N i n p u t v o l t a g e 0 . 7 V

    ( 1 ) I O = 0 m A t o 7 . 5 A ( 2 ) T h e a d j u s t a b l e o p t i o n o p e r a t e s w i t h a 2 % t o l e r a n c e o v e r T J = 0 t o 1 2 5 C .( 3 ) I O = 0 m A t o 7 . 5 A

    ( 4 ) I f V O 1 . 8 V t h e n V I m i n = 2 . 8 V , V I m a x = 5 . 5 V :

    I f VO 2 . 5 V t h e n V I m i n = VO + 1 V , V I m a x = 5 . 5 V :

    6

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    T P S 7 5 9 0 1 , T P S 7 5 9 1 5 T P S 7 5 9 1 8 , T P S 7 5 9 2 5 , T P S 7 5 9 3 3

    S L V S 3 1 8 E D E C E M B E R 2 0 0 0 R E V I S E D M A R C H 2 0 0 4

    E L E C T R I C A L C H A R A C T E R I S T I C S ( c o n t i n u e d )

    o v e r r e c o m m e n d e d o p e r a t i n g j u n c t i o n t e m p e r a t u r e r a n g e ( T J = - 4 0 C t o 1 2 5 C ) , V I = VO ( t y p ) + 1 V , I O = 1 m A , E N = 0 V ,

    CO = 1 0 0 F ( u n l e s s o t h e r w i s e n o t e d )

    P A R A M E T E R T E S T C O N D I T I O N S M I N T Y P M A X U N I T

    I O = 7 . 5 A , V I = 3 . 2 V , T J = 2 5C 4 0 0 m V D r o p o u t v o l t a g e ( 3 . 3 V o u t - p u t ) ( 5 )

    VO I O = 7 . 5 A , V I = 3 . 2 V 7 5 0 m V D i s c h a r g e t r a n s i s t o r c u r r e n t V O = 1 . 5 V , T J = 2 5C 1 0 2 5 m A

    U V L O T J = 2 5C , VI r i s i n g 2 . 2 2 . 7 5 V VI

    U V L O h y s t e r e s i s T J = 2 5C , VI f a l l i n g 1 0 0 m V

    ( 5 ) I N v o l t a g e e q u a l s V O( T y p ) - 1 0 0 m V ; T P S 7 5 9 1 5 , T P S 7 5 9 1 8 , a n d T P S 7 5 9 2 5 d r o p o u t v o l t a g e l i m i t e d b y i n p u t v o l t a g e r a n g e l i m i t a t i o n s ( i . e . , T P S 7 5 9 3 3 i n p u t v o l t a g e i s s e t t o 3 . 2 V f o r t h e p u r p o s e o f t h i s t e s t ) .

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    T Y P I C A L C H A R A C T E R I S T I C S

    T a b l e o f G r a p h s

    IO Output Current A

    1.530

    1.485

    1.515

    1.5

    1.470

    1.545

    0

    OutputVoltageV

    VO

    1.4551.5 7.53

    VI = 2.8 V

    TJ = 25C

    4.5 6

    IO Output Current A

    3.330

    3.270

    3.315

    3.285

    3.2551.5 7.5

    3.345

    0

    OutputVoltageV

    VO

    4.5

    VI = 4.3 V

    TJ = 25C

    3 6

    3.3

    T P S 7 5 9 0 1 , T P S 7 5 9 1 5 T P S 7 5 9 1 8 , T P S 7 5 9 2 5 , T P S 7 5 9 3 3 S L V S 3 1 8 E D E C E M B E R 2 0 0 0 R E V I S E D M A R C H 2 0 0 4

    F I G U R E

    v s O u t p u t c u r r e n t 2 , 3 VO O u t p u t v o l t a g e

    v s J u n c t i o n t e m p e r a t u r e 4 , 5

    G r o u n d c u r r e n t v s J u n c t i o n t e m p e r a t u r e 6

    P o w e r s u p p l y r i p p l e r e j e c t i o n v s F r e q u e n c y 7

    O u t p u t s p e c t r a l n o i s e d e n s i t y v s F r e q u e n c y 8

    zo O u t p u t i m p e d a n c e v s F r e q u e n c y 9

    v s I n p u t v o l t a g e 1 0 VD O D r o p o u t v o l t a g e

    v s J u n c t i o n t e m p e r a t u r e 1 1

    VI M i n i m u m r e q u i r e d i n p u t v o l t a g e v s O u t p u t v o l t a g e 1 2

    L i n e t r a n s i e n t r e s p o n s e 1 3 , 1 5

    L o a d t r a n s i e n t r e s p o n s e 1 4 , 1 6

    VO O u t p u t v o l t a g e a n d e n a b l e v o l t a g e v s T i m e ( s t a r t - u p ) 1 7

    E q u i v a l e n t s e r i e s r e s i s t a n c e ( E S R ) v s O u t p u t c u r r e n t 1 9 , 2 0

    T P S 7 5 9 3 3 T P S 7 5 9 1 5 O U T P U T V O L T A G E O U T P U T V O L T A G E

    v s v s O U T P U T C U R R E N T O U T P U T C U R R E N T

    F i g u r e 2 . F i g u r e 3 .

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    TJ Junction Temperature C

    OutputVoltageV

    VO

    3.315

    5 125

    3.33

    3.3

    20 80

    3.270

    3.285

    3.255

    3.345

    VI = 4.3 V

    40 25 10 35 50 65 11095

    TJ Junction Temperature C

    OutputVoltageV

    VO

    1.470

    1.485

    1.455

    1.530

    VI = 2.8 V

    1.5

    1.515

    1.545

    40 20 11035 9525 10 5 50 65 80 125

    40 25 10 5 20 35 50 65 80 95 110 125

    TJ Junction Temperature C

    GroundCurrent

    A

    102

    104

    106

    108

    110

    112

    114

    116

    118VI = 5 V

    IO = 7.5 A

    100k10k

    PSRR

    PowerSupplyRippleRejectio

    ndB

    f Frequency Hz

    70

    60

    50

    40

    30

    20

    10

    0

    90

    80

    1k10010 1M

    IO = 1 mA

    IO = 7.5 A

    10M

    VI = 4.3 V

    Co = 100 F

    TJ = 25C

    T P S 7 5 9 0 1 , T P S 7 5 9 1 5 T P S 7 5 9 1 8 , T P S 7 5 9 2 5 , T P S 7 5 9 3 3

    S L V S 3 1 8 E D E C E M B E R 2 0 0 0 R E V I S E D M A R C H 2 0 0 4

    T Y P I C A L C H A R A C T E R I S T I C S ( c o n t i n u e d )

    T P S 7 5 9 3 3 T P S 7 5 9 1 5 O U T P U T V O L T A G E O U T P U T V O L T A G E

    v s v s J U N C T I O N T E M P E R A T U R E J U N C T I O N T E M P E R A T U R E

    F i g u r e 4 . F i g u r e 5 .

    T P S 7 5 9 x x T P S 7 5 9 3 3 G R O U N D C U R R E N T P O W E R S U P P L Y R I P P L E R E J E C T I O N

    v s v s J U N C T I O N T E M P E R A T U R E F R E Q U E N C Y

    F i g u r e 6 . F i g u r e 7 .

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    0

    0.5

    1

    1.5

    2

    2.5

    IO = 7.5 A

    IO = 1 mA

    f Frequency Hz

    1010 100 1k 10k 100k

    VI = 4.3 V

    VO = 3.3 V

    Co = 100 F

    TJ = 25CV/

    Hz

    OutputSpectralNoiseDensity

    f Frequency Hz

    OutputImpedance

    zo

    10 100 100k 1M

    0.001

    10k1k 10M

    1

    100

    IO = 1 mA

    0.01

    0.1

    10

    IO = 7.5 A

    0.0001

    0.00001

    VI = 4.3 VCo = 100 F

    TJ = 25C

    VI Input Voltage V

    0 3 4

    500

    400

    300

    3.52.5

    DropoutVoltagemV

    200

    4.5 5

    VDO

    700

    600

    IO = 7.5 A

    TJ = 25C

    TJ = 40C

    TJ = 125C

    100

    TJ Junction Temperature C

    40 35 11050

    DropoutVoltagemV

    VDO

    600

    125

    500

    400

    300

    200

    100

    0

    IO = 7.5 A

    25 10 5 20 65 9580

    T P S 7 5 9 0 1 , T P S 7 5 9 1 5 T P S 7 5 9 1 8 , T P S 7 5 9 2 5 , T P S 7 5 9 3 3 S L V S 3 1 8 E D E C E M B E R 2 0 0 0 R E V I S E D M A R C H 2 0 0 4

    T Y P I C A L C H A R A C T E R I S T I C S ( c o n t i n u e d )

    T P S 7 5 9 3 3 T P S 7 5 9 3 3 O U T P U T S P E C T R A L N O I S E D E N S I T Y O U T P U T I M P E D A N C E

    v s v s F R E Q U E N C Y F R E Q U E N C Y

    F i g u r e 8 . F i g u r e 9 .

    T P S 7 5 9 0 1 T P S 7 5 9 3 3 D R O P O U T V O L T A G E D R O P O U T V O L T A G E

    v s v s I N P U T V O L T A G E J U N C T I O N T E M P E R A T U R E

    F i g u r e 1 0 . F i g u r e 1 1 .

    1 0

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    3.7

    50

    0

    VI

    t Time s

    0 15010050 200 250 350300 400 450 500

    InputVoltageV

    VO= 1.5 V

    IO

    = 7.5 A

    Co=100 F

    2.8

    50

    100

    VO

    ChangeinOutputVoltage

    mV

    2

    3

    4

    1.5 2.5 3.52 3

    MinimumRequiredInputVoltageV

    VO Output Voltage V

    VI

    2.8

    1.75 2.25 2.75 3.25

    IO = 7.5 A

    TJ = 125C

    TJ = 25C

    TJ = 40C

    t Time s

    I

    OutputCurrentA

    O

    200

    0

    0 604020 80 100 140120 160 180 200

    0

    100

    100

    VO= 1.5 V

    Co= 100 F

    10

    5

    200

    di

    dt+

    1 Ams

    VO

    ChangeinOutput

    VoltagemV

    t Time s

    VIInputVoltageV

    15010050 200 250 350300 400 450 5000

    100

    5.3

    50

    4.3

    VO= 3.3 V

    IO= 7.5 A

    Co= 100 F50

    0

    VO

    ChangeinOutpu

    tVoltagemV

    T P S 7 5 9 0 1 , T P S 7 5 9 1 5 T P S 7 5 9 1 8 , T P S 7 5 9 2 5 , T P S 7 5 9 3 3

    S L V S 3 1 8 E D E C E M B E R 2 0 0 0 R E V I S E D M A R C H 2 0 0 4

    T Y P I C A L C H A R A C T E R I S T I C S ( c o n t i n u e d )

    M I N I M U M R E Q U I R E D I N P U T V O L T A G E v s T P S 7 5 9 1 5

    O U T P U T V O L T A G E L I N E T R A N S I E N T R E S P O N S E

    F i g u r e 1 2 . F i g u r e 1 3 .

    T P S 7 5 9 1 5 T P S 7 5 9 3 3 L O A D T R A N S I E N T R E S P O N S E L I N E T R A N S I E N T R E S P O N S E

    F i g u r e 1 4 . F i g u r e 1 5 .

    1 1

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    t Time s

    I

    O

    utputCurrentA

    O

    7.5

    604020 80 100 140120 160 180 2000

    0

    100

    100

    VO= 3.3 V

    Co= 100 F

    200

    5

    0

    10

    200

    di

    dt+

    1 Ams

    VO

    ChangeinOutputVoltagem

    V

    t Time (Start-Up) ms

    0

    3.3

    0

    0

    4.3

    0.2 10.4 0.6 0.8

    OutputVoltage

    V

    VO

    EnableVoltageV

    VI = 4.3 VIO = 10 mA

    TJ = 25C

    T P S 7 5 9 0 1 , T P S 7 5 9 1 5 T P S 7 5 9 1 8 , T P S 7 5 9 2 5 , T P S 7 5 9 3 3 S L V S 3 1 8 E D E C E M B E R 2 0 0 0 R E V I S E D M A R C H 2 0 0 4

    T Y P I C A L C H A R A C T E R I S T I C S ( c o n t i n u e d )

    T P S 7 5 9 3 3 O U T P U T V O L T A G E A N D E N A B L E V O L T A G E

    T P S 7 5 9 3 3 v s L O A D T R A N S I E N T R E S P O N S E T I M E ( S T A R T - U P )

    F i g u r e 1 6 . F i g u r e 1 7 .

    1 2

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    IN

    EN

    OUT

    +

    GND

    Co

    ESR

    RL

    VITo Load

    0.010 7.5

    10

    IO Output Current A

    ESR

    EquivalentSeriesResistance

    1

    0.1

    Region of Stability

    0.015Region of Instability

    Co= 680

    FTJ = 25C

    1.5 3 4.5 60.01

    0 7.5

    10

    IO Output Current A

    1

    0.2

    ESR

    EquivalentSeriesResistance

    Co= 47 FTJ = 25C

    Region of Stability

    Region of Instability

    1.5 3 4.5 6

    T P S 7 5 9 0 1 , T P S 7 5 9 1 5 T P S 7 5 9 1 8 , T P S 7 5 9 2 5 , T P S 7 5 9 3 3

    S L V S 3 1 8 E D E C E M B E R 2 0 0 0 R E V I S E D M A R C H 2 0 0 4

    T Y P I C A L C H A R A C T E R I S T I C S ( c o n t i n u e d )

    F i g u r e 1 8 . T e s t C i r c u i t f o r T y p i c a l R e g i o n s o f S t a b i l i t y ( S e e F i g u r e 1 9 a n d F i g u r e 2 0 ) ( F i x e d O u t p u t O p t i o n s )

    T Y P I C A L R E G I O N O F S T A B I L I T Y T Y P I C A L R E G I O N O F S T A B I L I T Y E Q U I V A L E N T S E R I E S R E S I S T A N C E ( A ) E Q U I V A L E N T S E R I E S R E S I S T A N C E ( A )

    v s v s O U T P U T C U R R E N T O U T P U T C U R R E N T

    F i g u r e 1 9 . F i g u r e 2 0 .

    A . E q u i v a l e n t s e r i e s r e s i s t a n c e ( E S R ) r e f e r s t o t h e t o t a l s e r i e s r e s i s t a n c e , i n c l u d i n g t h e E S R o f t h e c a p a c i t o r , a y s e r i e s r e s i s t a n c e a d d e d e x t e r n a l l y , a n d P W B t r a c e r e s i s t a n c e t o C O.

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    T H E R M A L I N F O R M A T I O N

    PD

    max + VI(avg)

    * VO(avg)

    IO(avg)

    ) VI(avg)

    x I(Q) ( 1 )

    A

    B

    C

    A

    B

    C

    TJA

    RJC

    TCB

    RCS

    TA

    C

    RSA

    (a)

    (b)

    TO263 Package

    TO220 Package

    T P S 7 5 9 0 1 , T P S 7 5 9 1 5 T P S 7 5 9 1 8 , T P S 7 5 9 2 5 , T P S 7 5 9 3 3 S L V S 3 1 8 E D E C E M B E R 2 0 0 0 R E V I S E D M A R C H 2 0 0 4

    T h e a m o u n t o f h e a t t h a t a n L D O l i n e a r r e g u l a t o r g e n e r a t e s i s d i r e c t l y p r o p o r t i o n a l t o t h e a m o u n t o f p o w e r i t d i s s i p a t e s d u r i n g o p e r a t i o n . A l l i n t e g r a t e d c i r c u i t s h a v e a m a x i m u m a l l o w a b l e j u n c t i o n t e m p e r a t u r e ( T Jm a x ) a b o v e w h i c h n o r m a l o p e r a t i o n i s n o t a s s u r e d . A s y s t e m d e s i g n e r m u s t d e s i g n t h e o p e r a t i n g e n v i r o n m e n t s o t h a t t h e o p e r a t i n g j u n c t i o n t e m p e r a t u r e ( T J) d o e s n o t e x c e e d t h e m a x i m u m j u n c t i o n t e m p e r a t u r e ( T Jm a x ) . T h e t w o m a i n e n v i r o n m e n t a l v a r i a b l e s t h a t a d e s i g n e r c a n u s e t o i m p r o v e t h e r m a l p e r f o r m a n c e a r e a i r f l o w a n d e x t e r n a l h e a t s i n k s . T h e p u r p o s e o f t h i s i n f o r m a t i o n i s t o a i d t h e d e s i g n e r i n d e t e r m i n i n g t h e p r o p e r o p e r a t i n g e n v i r o n m e n t f o r a l i n e a r r e g u l a t o r t h a t i s o p e r a t i n g a t a s p e c i f i c p o w e r l e v e l .

    I n g e n e r a l , t h e m a x i m u m e x p e c t e d p o w e r ( P D ( m a x ) ) c o n s u m e d b y a l i n e a r r e g u l a t o r i s c o m p u t e d a s :

    W h e r e :

    VI ( a v g ) i s t h e a v e r a g e i n p u t v o l t a g e .

    VO ( a v g ) i s t h e a v e r a g e o u t p u t v o l t a g e .

    I O ( a v g ) i s t h e a v e r a g e o u t p u t c u r r e n t .

    I ( Q ) i s t h e q u i e s c e n t c u r r e n t .

    F o r m o s t T I L D O r e g u l a t o r s , t h e q u i e s c e n t c u r r e n t i s i n s i g n i f i c a n t c o m p a r e d t o t h e a v e r a g e o u t p u t c u r r e n t ; t h e r e f o r e , t h e t e r m V I ( a v g ) x I ( Q ) c a n b e n e g l e c t e d . T h e o p e r a t i n g j u n c t i o n t e m p e r a t u r e i s c o m p u t e d b y a d d i n g t h e a m b i e n t t e m p e r a t u r e ( T A) a n d t h e i n c r e a s e i n t e m p e r a t u r e d u e t o t h e r e g u l a t o r ' s p o w e r d i s s i p a t i o n . T h e t e m p e r a t u r e r i s e i s c o m p u t e d b y m u l t i p l y i n g t h e m a x i m u m e x p e c t e d p o w e r d i s s i p a t i o n b y t h e s u m o f t h e t h e r m a l r e s i s t a n c e s b e t w e e n t h e j u n c t i o n a n d t h e c a s e ( R J C) , t h e c a s e t o h e a t s i n k ( R C S) , a n d t h e h e a t s i n k t o a m b i e n t ( RS A) . T h e r m a l r e s i s t a n c e s a r e m e a s u r e s o f h o w e f f e c t i v e l y a n o b j e c t d i s s i p a t e s h e a t . T y p i c a l l y , t h e l a r g e r t h e d e v i c e , t h e m o r e s u r f a c e a r e a a v a i l a b l e f o r p o w e r d i s s i p a t i o n a n d t h e l o w e r t h e o b j e c t ' s t h e r m a l r e s i s t a n c e .

    F i g u r e 2 1 i l l u s t r a t e s t h e s e t h e r m a l r e s i s t a n c e s f o r ( a ) a T O - 2 2 0 p a c k a g e a t t a c h e d t o a h e a t s i n k , a n d ( b ) a T O - 2 6 3 p a c k a g e m o u n t e d o n a J E D E C H i g h - K b o a r d .

    F i g u r e 2 1 . T h e r m a l R e s i s t a n c e s

    1 4

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    TJ+ T

    A) P

    Dmax x R

    JC) R

    CS) R

    SA

    ( 2 )

    TJ+ T

    A) P

    Dmax x R

    JA ( 3 )

    RJA

    +

    TJT

    A

    PDmax

    ( 4 )

    T O - 2 2 0 P O W E R D I S S I P A T I O N

    PD

    max + (3.3 2.5) V x 3 A + 2.4 W( 5 )

    RJA

    max + (125 55) C2.4 W + 29 CW( 6 )

    T P S 7 5 9 0 1 , T P S 7 5 9 1 5 T P S 7 5 9 1 8 , T P S 7 5 9 2 5 , T P S 7 5 9 3 3

    S L V S 3 1 8 E D E C E M B E R 2 0 0 0 R E V I S E D M A R C H 2 0 0 4

    T H E R M A L I N F O R M A T I O N ( c o n t i n u e d )

    E q u a t i o n 2 s u m m a r i z e s t h e c o m p u t a t i o n :

    T h e R J C i s s p e c i f i c t o e a c h r e g u l a t o r a s d e t e r m i n e d b y i t s p a c k a g e , l e a d f r a m e , a n d d i e s i z e p r o v i d e d i n t h e

    r e g u l a t o r ' s d a t a s h e e t . T h e R S A i s a f u n c t i o n o f t h e t y p e a n d s i z e o f h e a t s i n k . F o r e x a m p l e , b l ac k b o d y r a d i a t o r t y p e h e a t s i n k s , l i k e t h e o n e a t t a c h e d t o t h e T O - 2 2 0 p a c k a g e i n F i g u r e 2 1 ( a ) , c a n h a v e R C S v a l u e s r a n g i n g f r o m 5C / W f o r v e r y l a r g e h e a t s i n k s t o 5 0 C / W f o r v e r y s m a l l h e a t s i n k s . T h e R C Si s a f u n c t i o n o f h o w t h e p a c k a g e i s a t t a c h e d t o t h e h e a t s i n k . F o r e x a m p l e , i f a t h e r m a l c o m p o u n d i s u s e d t o a t t a c h a h e a t s i n k t o a T O - 2 2 0 p a c k a g e , RC So f 1 C / W i s r e a s o n a b l e .

    E v e n i f n o e x t e r n a l b l a c k b o d y r a d i a t o r t y p e h e a t s i n k i s a t t a c h e d t o t h e p a c k a g e , t h e b o a r d o n w h i c h t h e r e g u l a t o r i s m o u n t e d w i l l p r o v i d e s o m e h e a t s i n k i n g t h r o u g h t h e p i n s o l d e r c o n n e c t i o n s . S o m e p a c k a g e s , l i k e t h e T O - 2 6 3 a n d T I ' s T S S O P P o w e r P A D p a c k a g e s , u s e a c o p p e r p l a n e u n d e r n e a t h t h e p a c k a g e o r t h e c i r c u i t b o a r d ' s g r o u n d p l a n e f o r a d d i t i o n a l h e a t s i n k i n g t o i m p r o v e t h e i r t h e r m a l p e r f o r m a n c e . C o m p u t e r a i d e d t h e r m a l m o d e l i n g c a n b e u s e d t o c o m p u t e v e r y a c c u r a t e a p p r o x i m a t i o n s o f a n i n t e g r a t e d c i r c u i t ' s t h e r m a l p e r f o r m a n c e i n d i f f e r e n t o p e r a t i n g e n v i r o n m e n t s ( e . g . , d i f f e r e n t t y p e s o f c i r c u i t b o a r d s , d i f f e r e n t t y p e s a n d s i z e s o f h e a t s i n k s , d i f f e r e n t a i r f l o w s , e t c . ) . U s i n g t h e s e m o d e l s , t h e t h r e e t h e r m a l r e s i s t a n c e s c a n b e c o m b i n e d i n t o o n e t h e r m a l r e s i s t a n c e b e t w e e n j u n c t i o n a n d a m b i e n t ( R J A) . T h i s R J A i s v a l i d o n l y f o r t h e s p e c i f i c o p e r a t i n g e n v i r o n m e n t u s e d i n t h e c o m p u t e r m o d e l .

    E q u a t i o n 2 s i m p l i f i e s i n t o E q u a t i o n 3 :

    R e a r r a n g i n g E q u a t i o n 3 g i v e s E q u a t i o n 4 :

    U s i n g E q u a t i o n 3 a n d t h e c o m p u t e r m o d e l g e n e r a t e d c u r v e s s h o w n i n F i g u r e 2 2 a n d F i g u r e 2 5 , a d e s i g n e r c a n q u i c k l y c o m p u t e t h e r e q u i r e d h e a t s i n k t h e r m a l r e s i s t a n c e / b o a r d a r e a f o r a g i v e n a m b i e n t t e m p e r a t u r e , p o w e r d i s s i p a t i o n , a n d o p e r a t i n g e n v i r o n m e n t .

    T h e T O - 2 2 0 p a c k a g e p r o v i d e s a n e f f e c t i v e m e a n s o f m a n a g i n g p o w e r d i s s i p a t i o n i n t h r o u g h - h o l e a p p l i c a t i o n s . T h e T O - 2 2 0 p a c k a g e d i m e n s i o n s a r e p r o v i d e d i n t h e M e c h a n i c a l D a t a s e c t i o n a t t h e e n d o f t h e d a t a s h e e t . A h e a t s i n k c a n b e u s e d w i t h t h e T O - 2 2 0 p a c k a g e t o e f f e c t i v e l y l o w e r t h e j u n c t i o n - t o - a m b i e n t t h e r m a l r e s i s t a n c e .

    T o i l l u s t r a t e , t h e T P S 7 5 9 2 5 i n a T O - 2 2 0 p a c k a g e w a s c h o s e n . F o r t h i s e x a m p l e , t h e a v e r a g e i n p u t v o l t a g e i s 3 . 3 V , t h e o u t p u t v o l t a g e i s 2 . 5 V , t h e a v e r a g e o u t p u t c u r r e n t i s 3 A , t h e a m b i e n t t e m p e r a t u r e 5 5 C , t h e a i r f l o w i s 1 5 0 L F M , a n d t h e o p e r a t i n g e n v i r o n m e n t i s t h e s a m e a s d o c u m e n t e d b e l o w . N e g l e c t i n g t h e q u i e s c e n t c u r r e n t , t h e m a x i m u m a v e r a g e p o w e r i s :

    S u b s t i t u t i n g T Jm a x f o r T J i n t o E q u a t i o n 4 g i v e s E q u a t i o n 6 :

    F r o m F i g u r e 2 2 , R J A v s H e a t s i n k T h e r m a l R e s i s t a n c e , a h e a t s i n k w i t h R S A = 2 2

    C / W i s r e q u i r e d t o d i s s i p a t e 2 . 4 W . T h e m o d e l o p e r a t i n g e n v i r o n m e n t u s e d i n t h e c o m p u t e r m o d e l t o c o n s t r u c t F i g u r e 2 2 c o n s i s t e d o f a s t a n d a r d J E D E C H i g h - K b o a r d ( 2 S 2 P ) w i t h a 1 o z . i n t e r n a l c o p p e r p l a n e a n d g r o u n d p l a n e . S i n c e t h e p a c k a g e p i n s w e r e s o l d e r e d t o t h e b o a r d , 4 5 0 m m 2 o f t h e b o a r d w a s m o d e l e d a s a h e a t s i n k . F i g u r e 2 3 s h o w s t h e s i d e v i e w o f t h e o p e r a t i n g e n v i r o n m e n t u s e d i n t h e c o m p u t e r m o d e l .

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    5

    15

    25

    35

    45

    55

    65

    0510152025

    RSA Heatsink Thermal Resistance C/W

    ThermalResistance

    JA

    R

    C/W

    No Heatsink

    Natural Convection

    Air Flow = 150 LFM

    Air Flow = 250 LFM

    Air Flow = 500 LFM

    1 oz. Copper

    Power Plane1 oz. Copper

    Ground Plane

    0.21 mm 0.21 mm

    T P S 7 5 9 0 1 , T P S 7 5 9 1 5 T P S 7 5 9 1 8 , T P S 7 5 9 2 5 , T P S 7 5 9 3 3 S L V S 3 1 8 E D E C E M B E R 2 0 0 0 R E V I S E D M A R C H 2 0 0 4

    T H E R M A L I N F O R M A T I O N ( c o n t i n u e d )

    F i g u r e 2 2 . T h e r m a l R e s i s t a n c e v s H e a t s i n k T h e r m a l R e s i s t a n c e

    F i g u r e 2 3 .

    F r o m t h e d a t a i n F i g u r e 2 2 a n d r e a r r a n g i n g E q u a t i o n 4 , t h e m a x i m u m p o w e r d i s s i p a t i o n f o r a d i f f e r e n t h e a t s i n k RS A a n d a s p e c i f i c a m b i e n t t e m p e r a t u r e c a n b e c o m p u t e d ( s e e F i g u r e 2 4 ) .

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    1

    10

    01020

    PowerDissipationLimitW

    PD

    RSA Heatsink Thermal Resistance C/W

    No Heatsink

    TA = 55C

    Natural Convection

    Air Flow = 150 LFM

    Air Flow = 250 LFM

    Air Flow = 500 LFM

    P

    D

    max + (3.3 2.5) V x 3 A + 2.4 W

    ( 7 )

    RJA

    max + (125 55) C2.4 W + 29 CW( 8 )

    T P S 7 5 9 0 1 , T P S 7 5 9 1 5 T P S 7 5 9 1 8 , T P S 7 5 9 2 5 , T P S 7 5 9 3 3

    S L V S 3 1 8 E D E C E M B E R 2 0 0 0 R E V I S E D M A R C H 2 0 0 4

    T H E R M A L I N F O R M A T I O N ( c o n t i n u e d )

    F i g u r e 2 4 . P o w e r D i s s i p a t i o n v s H e a t s i n k T h e r m a l R e s i s t a n c e

    T h e T O - 2 6 3 p a c k a g e p r o v i d e s a n e f f e c t i v e m e a n s o f m a n a g i n g p o w e r d i s s i p a t i o n i n s u r f a c e m o u n t a p p l i c a t i o n s . T h e T O - 2 6 3 p a c k a g e d i m e n s i o n s a r e p r o v i d e d i n t h e M e c h a n i c a l D a t a s e c t i o n a t t h e e n d o f t h e d a t a s h e e t . T h e a d d i t i o n o f a c o p p e r p l a n e d i r e c t l y u n d e r n e a t h t h e T O - 2 6 3 p a c k a g e e n h a n c e s t h e t h e r m a l p e r f o r m a n c e o f t h e p a c k a g e .

    T o i l l u s t r a t e , t h e T P S 7 5 9 2 5 i n a T O - 2 6 3 p a c k a g e w a s c h o s e n . F o r t h i s e x a m p l e , t h e a v e r a g e i n p u t v o l t a g e i s 3 . 3 V , t h e o u t p u t v o l t a g e i s 2 . 5 V , t h e a v e r a g e o u t p u t c u r r e n t i s 3 A , t h e a m b i e n t t e m p e r a t u r e 5 5 C , t h e a i r f l o w i s 1 5 0 L F M , a n d t h e o p e r a t i n g e n v i r o n m e n t i s t h e s a m e a s d o c u m e n t e d b e l o w . N e g l e c t i n g t h e q u i e s c e n t c u r r e n t , t h e m a x i m u m a v e r a g e p o w e r i s :

    S u b s t i t u t i n g T Jm a x f o r T J i n t o E q u a t i o n 4 g i v e s E q u a t i o n 8 :

    F r o m F i g u r e 2 5 , R J A v s C o p p e r H e a t s i n k A r e a , t h e g r o u n d p l a n e n e e d s t o b e 2 c m 2 f o r t h e p a r t t o d i s s i p a t e

    2 . 4 W . T h e m o d e l o p e r a t i n g e n v i r o n m e n t u s e d i n t h e c o m p u t e r m o d e l t o c o n s t r u c t F i g u r e 2 5 c o n s i s t e d o f a s t a n d a r d J E D E C H i g h - K b o a r d ( 2 S 2 P ) w i t h a 1 o z . i n t e r n a l c o p p e r p l a n e a n d g r o u n d p l a n e . T h e p a c k a g e i s s o l d e r e d t o a 2 o z . c o p p e r p a d . T h e p a d i s t i e d t h r o u g h t h e r m a l v i a s t o t h e 1 o z . g r o u n d p l a n e . F i g u r e 2 6 s h o w s t h e s i d e v i e w o f t h e o p e r a t i n g e n v i r o n m e n t u s e d i n t h e c o m p u t e r m o d e l .

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    15

    20

    25

    30

    35

    40

    0 0.01 0.1 1 10 100

    Copper Heatsink Area cm2

    ThermalResistance

    JA

    R

    C/W

    No Air Flow

    150 LFM

    250 LFM

    1 oz. Copper

    Power Plane

    1 oz. Copper

    Ground Plane

    2 oz. Copper

    Solder Pad

    with 25 Thermal

    Vias

    Thermal Vias, 0.3 mm

    Diameter, 1.5 mm Pitch

    T P S 7 5 9 0 1 , T P S 7 5 9 1 5 T P S 7 5 9 1 8 , T P S 7 5 9 2 5 , T P S 7 5 9 3 3 S L V S 3 1 8 E D E C E M B E R 2 0 0 0 R E V I S E D M A R C H 2 0 0 4

    T H E R M A L I N F O R M A T I O N ( c o n t i n u e d )

    F i g u r e 2 5 . T h e r m a l R e s i s t a n c e v s C o p p e r H e a t s i n k A r e a

    F i g u r e 2 6 .

    F r o m t h e d a t a i n F i g u r e 2 5 a n d r e a r r a n g i n g E q u a t i o n 4 , t h e m a x i m u m p o w e r d i s s i p a t i o n f o r a d i f f e r e n t g r o u n d p l a n e a r e a a n d a s p e c i f i c a m b i e n t t e m p e r a t u r e c a n b e c o m p u t e d ( s e e F i g u r e 2 7 ) .

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    1

    2

    3

    4

    5

    0 0.01 0.1 1 10 100

    MaximumPowerDissipatio

    nW

    PD

    Copper Heatsink Area cm2

    TA = 55C

    No Air Flow

    150 LFM

    250 LFM

    T P S 7 5 9 0 1 , T P S 7 5 9 1 5 T P S 7 5 9 1 8 , T P S 7 5 9 2 5 , T P S 7 5 9 3 3

    S L V S 3 1 8 E D E C E M B E R 2 0 0 0 R E V I S E D M A R C H 2 0 0 4

    T H E R M A L I N F O R M A T I O N ( c o n t i n u e d )

    F i g u r e 2 7 . M a x i m u m P o w e r D i s s i p a t i o n v s C o p p e r H e a t s i n k A r e a

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    A P P L I C A T I O N I N F O R M A T I O N

    P R O G R A M M I N G T H E T P S 7 5 9 0 1 A D J U S T A B L E L D O R E G U L A T O R

    VO + Vref 1)R1R2

    Where:

    Vref = 1.224 V typ (the internal reference voltage) ( 9 )

    R1+ VOVref

    * 1 R2( 1 0 )

    VO

    VI

    OUT

    FB

    R1

    R2GND

    EN

    IN

    0.7 V

    2 V

    TPS75901

    1 F

    Co

    OUTPUT VOLTAGE

    PROGRAMMING GUIDE

    OUTPUT

    VOLTAGER1 R2

    2.5 V

    3.3 V

    3.6 V

    UNIT

    31.6

    51

    58.3

    30.1

    30.1

    30.1

    k

    k

    k

    R E G U L A T O R P R O T E C T I O N

    I N P U T C A P A C I T O R

    T P S 7 5 9 0 1 , T P S 7 5 9 1 5 T P S 7 5 9 1 8 , T P S 7 5 9 2 5 , T P S 7 5 9 3 3 S L V S 3 1 8 E D E C E M B E R 2 0 0 0 R E V I S E D M A R C H 2 0 0 4

    T h e o u t p u t v o l t a g e o f t h e T P S 7 5 9 0 1 a d j u s t a b l e r e g u l a t o r i s p r o g r a m m e d u s i n g a n e x t e r n a l r e s i s t o r d i v i d e r a s s h o w n i n F i g u r e 2 8 . T h e o u t p u t v o l t a g e i s c a l c u l a t e d u s i n g :

    R e s i s t o r s R 1 a n d R 2 s h o u l d b e c h o s e n f o r a p p r o x i m a t e l y 4 0 - A d i v i d e r c u r r e n t . L o w e r v a l u e r e s i s t o r s c a n b e u s e d b u t o f f e r n o i n h e r e n t a d v a n t a g e a n d w a s t e m o r e p o w e r . H i g h e r v a l u e s s h o u l d b e a v o i d e d a s l e a k a g e c u r r e n t s a t F B i n c r e a s e t h e o u t p u t v o l t a g e e r r o r . T h e r e c o m m e n d e d d e s i g n p r o c e d u r e i s t o c h o o s e R 2 = 3 0 . 1 k t o s e t t h e d i v i d e r c u r r e n t a t 4 0 A a n d t h e n c a l c u l a t e R 1 u s i n g :

    F i g u r e 2 8 . T P S 7 5 9 0 1 A d j u s t a b l e L D O R e g u l a t o r P r o g r a m m i n g

    T h e T P S 7 5 9 x x P M O S - p a s s t r a n s i s t o r h a s a b u i l t - i n b a c k d i o d e t h a t c o n d u c t s r e v e r s e c u r r e n t s w h e n t h e i n p u t v o l t a g e d r o p s b e l o w t h e o u t p u t v o l t a g e ( e . g . , d u r i n g p o w e r d o w n ) . C u r r e n t i s c o n d u c t e d f r o m t h e o u t p u t t o t h e i n p u t a n d i s n o t i n t e r n a l l y l i m i t e d . W h e n e x t e n d e d r e v e r s e v o l t a g e i s a n t i c i p a t e d , e x t e r n a l l i m i t i n g m a y b e a p p r o p r i a t e .

    T h e T P S 7 5 9 x x a l s o f e a t u r e s i n t e r n a l c u r r e n t l i m i t i n g a n d t h e r m a l p r o t e c t i o n . D u r i n g n o r m a l o p e r a t i o n , t h e T P S 7 5 9 x x l i m i t s o u t p u t c u r r e n t t o a p p r o x i m a t e l y 1 0 A . W h e n c u r r e n t l i m i t i n g e n g a g e s , t h e o u t p u t v o l t a g e s c a l e s b a c k l i n e a r l y u n t i l t h e o v e r c u r r e n t c o n d i t i o n e n d s . W h i l e c u r r e n t l i m i t i n g i s d e s i g n e d t o p r e v e n t g r o s s d e v i c e f a i l u r e , c a r e s h o u l d b e t a k e n n o t t o e x c e e d t h e p o w e r d i s s i p a t i o n r a t i n g s o f t h e p a c k a g e . I f t h e t e m p e r a t u r e o f t h e d e v i c e e x c e e d s 1 5 0 C ( t y p ) , t h e r m a l - p r o t e c t i o n c i r c u i t r y s h u t s i t d o w n . O n c e t h e d e v i c e h a s c o o l e d b e l o w 1 3 0 C( t y p ) , r e g u l a t o r o p e r a t i o n r e s u m e s .

    F o r a t y p i c a l a p p l i c a t i o n , a c e r a m i c i n p u t b y p a s s c a p a c i t o r ( 0 . 2 2 F - 1 F ) i s r e c o m m e n d e d t o e n s u r e d e v i c e s t a b i l i t y . T h i s c a p a c i t o r s h o u l d b e a s c l o s e a s p o s s i b l e t o t h e i n p u t p i n . D u e t o t h e i m p e d a n c e o f t h e i n p u t s u p p l y , l a r g e t r a n s i e n t c u r r e n t s w i l l c a u s e t h e i n p u t v o l t a g e t o d r o o p . I f t h i s d r o o p c a u s e s t h e i n p u t v o l t a g e t o d r o p b e l o w t h e U V L O t h r e s h o l d , t h e d e v i c e w i l l t u r n o f f . T h e r e f o r e , i t i s r e c o m m e n d e d t h a t a l a r g e r c a p a c i t o r b e p l a c e d i n p a r a l l e l w i t h t h e c e r a m i c b y p a s s c a p a c i t o r a t t h e r e g u l a t o r ' s i n p u t . T h e s i z e o f t h i s c a p a c i t o r d e p e n d s o n t h e o u t p u t c u r r e n t , r e s p o n s e t i m e o f t h e m a i n p o w e r s u p p l y , a n d t h e m a i n p o w e r s u p p l y ' s d i s t a n c e t o t h e r e g u l a t o r . A t a m i n i m u m , t h e c a p a c i t o r s h o u l d b e s i z e d t o e n s u r e t h a t t h e i n p u t v o l t a g e d o e s n o t d r o p b e l o w t h e m i n i m u m U V L O t h r e s h o l d v o l t a g e d u r i n g n o r m a l o p e r a t i n g c o n d i t i o n s .

    2 0

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    www.ti.com

    O U T P U T C A P A C I T O R

    100

    47

    100.01

    1000

    0.1

    ESR Equivalent Series Resistance

    OutputCapacitance

    F

    Y= ESRmin x Co

    Region of Stability

    Region of Instability

    ESR min x Co = Constant

    0.2

    T P S 7 5 9 0 1 , T P S 7 5 9 1 5 T P S 7 5 9 1 8 , T P S 7 5 9 2 5 , T P S 7 5 9 3 3

    S L V S 3 1 8 E D E C E M B E R 2 0 0 0 R E V I S E D M A R C H 2 0 0 4

    A P P L I C A T I O N I N F O R M A T I O N ( c o n t i n u e d )

    A s w i t h m o s t L D O r e g u l a t o r s , t h e T P S 7 5 9 x x r e q u i r e s a n o u t p u t c a p a c i t o r c o n n e c t e d b e t w e e n O U T a n d G N D t o s t a b i l i z e t h e i n t e r n a l c o n t r o l l o o p . T h e m i n i m u m r e c o m m e n d e d c a p a c i t a n c e v a l u e i s 4 7 F w i t h a n E S R ( e q u i v a l e n t s e r i e s r e s i s t a n c e ) o f a t l e a s t 2 0 0 m . A s s h o w n i n F i g u r e 2 9 , m o s t c a p a c i t o r a n d E S R c o m b i n a t i o n s w i t h a p r o d u c t o f 4 7 e - 6 x 0 . 2 = 9 . 4 e - 6 o r l a r g e r w i l l b e s t a b l e , p r o v i d e d t h e c a p a c i t o r v a l u e i s a t l e a s t 4 7 F . S o l i d t a n t a l u m e l e c t r o l y t i c a n d a l u m i n u m e l e c t r o l y t i c c a p a c i t o r s a r e a l l s u i t a b l e , p r o v i d e d t h e y m e e t t h e r e q u i r e m e n t s d e s c r i b e d i n t h i s s e c t i o n . L a r g e r c a p a c i t o r s p r o v i d e a w i d e r r a n g e o f s t a b i l i t y a n d b e t t e r l o a d t r a n s i e n t r e s p o n s e .

    T h i s i n f o r m a t i o n a l o n g w i t h t h e E S R g r a p h s , F i g u r e 1 9 , F i g u r e 2 0 , a n d F i g u r e 2 9 , i s i n c l u d e d t o a s s i s t i n s e l e c t i o n o f s u i t a b l e c a p a c i t a n c e f o r t h e u s e r ' s a p p l i c a t i o n . W h e n n e c e s s a r y t o a c h i e v e l o w h e i g h t r e q u i r e m e n t s a l o n g w i t h h i g h o u t p u t c u r r e n t a n d / o r h i g h l o a d c a p a c i t a n c e , s e v e r a l h i g h e r E S R c a p a c i t o r s c a n b e u s e d i n p a r a l l e l t o m e e t t h e s e g u i d e l i n e s .

    F i g u r e 2 9 . O u t p u t C a p a c i t a n c e v s E q u i v a l e n t S e r i e s R e s i s t a n c e

    2 1

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    PACKAGING INFORMATION

    ORDERABLE DEVICE STATUS(1) PACKAGE TYPE PACKAGE DRAWING PINS PACKAGE QTY

    TPS75901KC ACTIVE TO/SOT KC 5 50

    TPS75901KTT OBSOLETE PFM KTT 5TPS75901KTTR ACTIVE PFM KTT 5 500

    TPS75901KTTT ACTIVE PFM KTT 5 50

    TPS75915KC ACTIVE TO/SOT KC 5 50

    TPS75915KTT OBSOLETE PFM KTT 5

    TPS75915KTTR ACTIVE PFM KTT 5 500

    TPS75915KTTT ACTIVE PFM KTT 5 50

    TPS75918KC ACTIVE TO/SOT KC 5 50

    TPS75918KTT OBSOLETE PFM KTT 5

    TPS75918KTTR ACTIVE PFM KTT 5 500

    TPS75918KTTT ACTIVE PFM KTT 5 50

    TPS75925KC ACTIVE TO/SOT KC 5 50

    TPS75925KTT OBSOLETE PFM KTT 5

    TPS75925KTTR ACTIVE PFM KTT 5 500

    TPS75925KTTT ACTIVE PFM KTT 5 50

    TPS75933KC ACTIVE TO/SOT KC 5 50

    TPS75933KTT OBSOLETE PFM KTT 5

    TPS75933KTTR ACTIVE PFM KTT 5 500

    TPS75933KTTT ACTIVE PFM KTT 5 50

    (1) The marketing status values are defined as follows:ACTIVE: Product device recommended for new designs.LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part ina new design.PREVIEW: Device has been announced but is not in production. Samples may or may not be available.OBSOLETE: TI has discontinued the production of the device.

    PACKAGE OPTION ADDENDUM

    www.ti.com 5-Mar-2004

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    MECHANICAL DATA

    MSOT008B JANUARY 1995 REVISED SEPTEMBER 2000

    1POST OFFICE BOX 655303 DALLAS, TEXAS 75265

    KC (R-PSFM-T5) PLASTIC FLANGE-MOUNT

    4040208/E 09/00

    0.420 (10,67) 0.185 (4,70)

    0.055 (1,40)

    0.147 (3,73)

    0.340 (8,64)

    1.037 (26,34)

    0.040 (1,02)

    0.030 (0,76)

    0.997 (25,32)

    0.380 (9,65)

    0.330 (8,38)

    0.137 (3,48)

    0.045 (1,14)

    0.175 (4,46)

    0.113 (2,87)

    0.122 (3,10)

    0.025 (0,64)

    0.102 (2,59)

    0.012 (0,30)

    0.103 (2,62)0.146 (3,71)

    0.156 (3,96)DIA

    (see Note C)

    0.125 (3,18)

    0.067 (1,70)

    0.268 (6,81)

    51

    M0.010 (0,25)

    NOTES: A. All linear dimensions are in inches (millimeters).

    B. This drawing is subject to change without notice.

    C. Lead dimensions are not controlled within this area.

    D. All lead dimensions apply before solder dip.

    E. The center lead is in electrical contact with the mounting tab.

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