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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
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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 ) .
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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 :
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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 .
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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 .
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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 .
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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
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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 .
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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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IMPORTANT NOTICE
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