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1 F E A T U R E S
A P P L I C A T I O N S
D E S C R I P T I O N
ACOP
bq24751A
28 LD QFN
TOP VIEW
LEARN
SRN
BAT
CELLS
SRP
SRSET
IADAPT
ACDRV
ACSET
CHGEN
ACN
ACP
ACDET
PVCC
BTST
HIDRV
REGN
PH
LODRV
PGND
OVPSET
AGND
VREF
VADJ
VDAC
ACGOOD
BATDRV
1
2
3
4
5
6
7
8 9 10 11 12 13 14
15
16
17
18
19
20
21
27 26 25 2 4 23 2228
b q 2 4 7 5 1 A S L U S 7 5 6 S E P T E M B E R 2 0 0 7
w w w . t i . c o m
H o s t - c o n t r o l l e d M u l t i - C h e m i s t r y B a t t e r y C h a r g e r W i t h S y s t e m P o w e r S e l e c t o r , A C O v e r - P o w e r P r o t e c t i o n , P r o g r a m m a b l e O V P a n d L o w I q
2 8 - p i n , 5 x 5 - m m Q F N p a c k a g e
N M O S - N M O S S y n c h r o n o u s B u c k C o n v e r t e r E n e r g y S t a r L o w I qw i t h 3 0 0 k H z F r e q u e n c y a n d > 9 5 % E f f i c i e n c y < 1 0 - A O f f - S t a t e B a t t e r y D i s c h a r g e C u r r e n t
3 0 - n s M i n i m u m D r i v e r D e a d - t i m e a n d 9 9 . 5 % < 1 . 5 - m A O f f - S t a t e I n p u t Q u i e s c e n t C u r r e n t M a x i m u m E f f e c t i v e D u t y C y c l e
H i g h - A c c u r a c y V o l t a g e a n d C u r r e n t R e g u l a t i o n
N o t e b o o k a n d U l t r a - M o b i l e C o m p u t e r s 0 . 5 % C h a r g e V o l t a g e A c c u r a c y
P o r t a b l e D a t a C a p t u r e T e r m i n a l s 3 % C h a r g e C u r r e n t A c c u r a c y P o r t a b l e P r i n t e r s 3 % A d a p t e r C u r r e n t A c c u r a c y M e d i c a l D i a g n o s t i c s E q u i p m e n t 2 % I n p u t C u r r e n t S e n s e A m p A c c u r a c y B a t t e r y B a y C h a r g e r s
I n t e g r a t i o n B a t t e r y B a c k - u p S y s t e m s A u t o m a t i c S y s t e m P o w e r S e l e c t i o n F r o m
A C / D C A d a p t e r o r B a t t e r y
I n t e r n a l L o o p C o m p e n s a t i o nT h e b q 2 4 7 5 1 A i s a h i g h - e f f i c i e n c y , s y n c h r o n o u s
I n t e r n a l S o f t S t a r tb a t t e r y c h a r g e r w i t h i n t e g r a t e d c o m p e n s a t i o n a n d
S a f e t y s y s t e m p o w e r s e l e c t o r l o g i c , o f f e r i n g l o w c o m p o n e n t c o u n t f o r s p a c e - c o n s t r a i n e d m u l t i - c h e m i s t r y b a t t e r y P r o g r a m m a b l e I n p u t O v e r v o l t a g ec h a r g i n g a p p l i c a t i o n s . R a t i o m e t r i c c h a r g e c u r r e n t a n d P r o t e c t i o n ( O V P ) v o l t a g e p r o g r a m m i n g a l l o w s v e r y h i g h r e g u l a t i o n
D y n a m i c P o w e r M a n a g e m e n t ( D P M ) w i t ha c c u r a c i e s , a n d c a n b e e i t h e r h a r d w i r e d w i t h r e s i s t o r s
S t a t u s I n d i c a t o r o r p r o g r a m m e d b y t h e s y s t e m p o w e r - m a n a g e m e n t P r o g r a m m a b l e I n r u s h A d a p t e r P o w e r m i c r o c o n t r o l l e r u s i n g a D A C o r G P I O s .
( A C O P ) a n d O v e r c u r r e n t ( A C O C ) L i m i t s T h e b q 2 4 7 5 1 A c h a r g e s t w o , t h r e e , o r f o u r s e r i e s L i +
R e v e r s e - C o n d u c t i o n P r o t e c t i o n I n p u t F E T c e l l s , s u p p o r t i n g u p t o 1 0 A o f c h a r g e c u r r e n t , a n d i s a v a i l a b l e i n a 2 8 - p i n , 5 x 5 - m m t h i n Q F N p a c k a g e . S u p p o r t s T w o , T h r e e , o r F o u r L i + C e l l s
5 2 4 V A C / D C - A d a p t e r O p e r a t i n g R a n g e
A n a l o g I n p u t s w i t h R a t i o m e t r i c P r o g r a m m i n g v i a R e s i s t o r s o r D A C / G P I O H o s t C o n t r o l
C h a r g e V o l t a g e ( 4 - 4 . 5 1 2 V / c e l l )
C h a r g e C u r r e n t ( u p t o 1 0 A , w i t h 1 0 - m
s e n s e r e s i s t o r )
A d a p t e r C u r r e n t L i m i t ( D P M )
S t a t u s a n d M o n i t o r i n g O u t p u t s
A C / D C A d a p t e r P r e s e n t w i t h P r o g r a m m a b l e
V o l t a g e T h r e s h o l d C u r r e n t D r a w n f r o m I n p u t S o u r c e
B a t t e r y L e a r n C y c l e C o n t r o l
S u p p o r t s A n y B a t t e r y C h e m i s t r y : L i + , N i C d , N i M H , L e a d A c i d , e t c .
C h a r g e E n a b l e
1
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 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 7 , 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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2/36
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D E S C R I P T I O N ( C O N T I N U E D )
VREF
RAC
RSR
(1) Pull-up rail could be either VREF or other system rail .
(2) SRSET/ACSET could come from either DAC or resistor dividers .
Q2 (ACFET)
SI4435
Q3(BATFET)
SI4435
N
P P
ACN
ACP
ACDRV
ACDET
ACGOOD
SRSET
ACSET
VREF
DAC
CELLS
CHGEN
VDAC
VADJDAC
ADC IADAPT
HOST
PVCC
BATDRV
HIDRV
N
PH
BTST
REGN
LODRV
PGND
SRP
SRN
P
PACK+
PACK-
SYSTEMADAPTER+
ADAPTER-
ACGOOD
AGND
bq24751A
R1
R266.5
k
10 kR4
C4
100 pHC5
C8
Q4FDS6680A
Q5FDS6680A
C9 L1
D1 BAT54
1 FC10
C4
BAT
OVPSET
LEARN
ACOP
Q1 (ACFET)
SI4435
R3 422 k
C3C2
0.1 F 0.1 F
0.010
1 F
C610 F
C710 F
0.010
C12
10 F
0.1 F
C130.1 F
C11
10 F
0.1 F
C15
0.1 F
C16
0.47 F
1 F
432 k 1%
8.2 H
PowerPad
C19
10 F
C18
10 F
C17
10 F
R5 71 k
R6 100 k
b q 2 4 7 5 1 AS L U S 7 5 6 S E P T E M B E R 2 0 0 7
T h e s e d e v i c e s h a v e l i m i t e d b u i l t - i n E S D p r o t e c t i o n . T h e l e a d s s h o u l d b e s h o r t e d t o g e t h e r o r t h e d e v i c e p l a c e d i n c o n d u c t i v e f o a m d u r i n g s t o r a g e o r h a n d l i n g t o p r e v e n t e l e c t r o s t a t i c d a m a g e t o t h e M O S g a t e s .
T h e b q 2 4 7 5 1 A c o n t r o l s e x t e r n a l s w i t c h e s t o p r e v e n t b a t t e r y d i s c h a r g e b a c k t o t h e i n p u t , c o n n e c t t h e a d a p t e r t o
t h e s y s t e m , a n d t o c o n n e c t t h e b a t t e r y t o t h e s y s t e m u s i n g 6 - V g a t e d r i v e s f o r b e t t e r s y s t e m e f f i c i e n c y . F o r m a x i m u m s y s t e m s a f e t y , i n r u s h - p o w e r l i m i t i n g p r o v i d e s i n s t a n t a n e o u s r e s p o n s e t o h i g h i n p u t v o l t a g e m u l t i p l i e d b y c u r r e n t . T h i s A C O v e r - P o w e r p r o t e c t i o n ( A C O P ) f e a t u r e l i m i t s t h e i n p u t - s w i t c h p o w e r t o t h e p r o g r a m m e d l e v e l o n t h e A C O P p i n , a n d l a t c h e s o f f i f t h e h i g h - p o w e r c o n d i t i o n p e r s i s t s t o p r e v e n t o v e r h e a t i n g .
T h e b q 2 4 7 5 1 A f e a t u r e s D y n a m i c P o w e r M a n a g e m e n t ( D P M ) a n d i n p u t p o w e r l i m i t i n g . T h e s e f e a t u r e s r e d u c e b a t t e r y c h a r g e c u r r e n t w h e n t h e i n p u t p o w e r l i m i t i s r e a c h e d t o a v o i d o v e r l o a d i n g t h e A C a d a p t e r w h e n s u p p l y i n g t h e l o a d a n d t h e b a t t e r y c h a r g e r s i m u l t a n e o u s l y . A h i g h l y - a c c u r a t e c u r r e n t - s e n s e a m p l i f i e r e n a b l e s p r e c i s e m e a s u r e m e n t o f i n p u t c u r r e n t f r o m t h e A C a d a p t e r t o m o n i t o r t h e o v e r a l l s y s t e m p o w e r .
T Y P I C A L A P P L I C A T I O N
V I N = 2 0 V , V B A T = 3 - c e l l L i - I o n , I c h a r g e = 3 A , I a d a p t e r _ l i m i t = 4 A
F i g u r e 1 . T y p i c a l S y s t e m S c h e m a t i c , V o l t a g e a n d C u r r e n t P r o g r a m m e d b y D A C
2 S u b m i t D o c u m e n t a t i o n F e e d b a c k C o p y r i g h t 2 0 0 7 , 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 F o l d e r L i n k ( s ) : b q 2 4 7 5 1 A
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VREF
R1 432 k
R266.5
k
10 kR4
R3 422 k
R5 71 k
RAC
RSR
(1) Pull-up rail could be either VREF or other system rail .
(2) SRSET/ACSET could come from either DAC or resistor dividers .
Q2 (ACFET)SI4435
Q3(BATFET)
SI4435
N
P P
ACN
ACP
ACDRV
ACDET
ACGOOD
PVCC
BATDRV
HIDRV
N
PH
BTST
REGN
LODRV
PGND
SRP
SRN
P
PACK+
PACK-
SYSTEMADAPTER+
ADAPTER-
ACGOOD
AGND
bq24751A
C8
Q4
FDS6680A
Q5
FDS6680A
C9 L1
D1 BAT54
C4
BAT
OVPSET
LEARN
ACOP
Q1 (ACFET)SI4435
C3C2
0.1 F0.1 F
0.010
1 F
C6
10 FC7
10 F
0.010
C12
10 F
0.1 F
C13
0.1 F
C11
10 F
0.1 F
C15
0.1 F
C16
0.47 F
8.2 H
PowerPad
SRSET
ACSET
VREF
CELLS
CHGEN
VDAC
VADJ
GPIO
ADC IADAPT
HOST
C4
1 F
C5100 pF
66.5 k
R9
R8100 k
43 kR7
R6 100 k
C19
10 F
C1
10 F
C18
10 F
C17
10 F
R10 100 k
C10
1 F
P A C K A G E T H E R M A L D A T A
b q 2 4 7 5 1 A S L U S 7 5 6 S E P T E M B E R 2 0 0 7
V I N = 2 0 V , V B A T = 3 - c e l l L i - I o n , I c h a r g e = 3 A , I a d a p t e r _ l i m i t = 4 A
F i g u r e 2 . T y p i c a l S y s t e m S c h e m a t i c , V o l t a g e a n d C u r r e n t P r o g r a m m e d b y R e s i s t o r
O R D E R I N G I N F O R M A T I O N
O R D E R I N G N U M B E R P A R T N U M B E R P A C K A G E Q U A N T I T Y
( T a p e a n d R e e l )
b q 2 4 7 5 1 A R H D R 3 0 0 0 b q 2 4 7 5 1 A 2 8 - P I N 5 x 5 m m Q F N
b q 2 4 7 5 1 A R H D T 2 5 0
P A C K A G E J A T A = 7 0 C P O W E R R A T I N G D E R A T I N G F A C T O R A B O V E T A = 2 5 CQ F N R H D ( 1 ) ( 2 ) 3 9 C / W 2 . 3 6 W 0 . 0 2 8 W / C
( 1 ) F o r t h e m o s t c u r r e n t p a c k a g e a n d o r d e r i n g i n f o r m a t i o n , s e e t h e P a c k a g e O p t i o n A d d e n d u m a t t h e e n d o f t h i s d o c u m e n t , o r s e e t h e T IW e b s i t e a t w w w . t i . c o m .
( 2 ) T h i s d a t a i s b a s e d o n u s i n g t h e J E D E C H i g h - K b o a r d a n d t h e e x p o s e d d i e p a d i s c o n n e c t e d t o a C u p a d o n t h e b o a r d . T h i s i s c o n n e c t e d t o t h e g r o u n d p l a n e b y a 2 x 3 v i a m a t r i x .
C o p y r i g h t 2 0 0 7 , 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 S u b m i t D o c u m e n t a t i o n F e e d b a c k 3
P r o d u c t F o l d e r L i n k ( s ) : b q 2 4 7 5 1 A
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www.ti.comb q 2 4 7 5 1 AS L U S 7 5 6 S E P T E M B E R 2 0 0 7
T a b l e 1 . T E R M I N A L F U N C T I O N S 2 8 - P I N Q F N
T E R M I N A L D E S C R I P T I O N
N A M E N O .
C H G E N 1 C h a r g e e n a b l e a c t i v e - l o w l o g i c i n p u t . L O e n a b l e s c h a r g e . H I d i s a b l e s c h a r g e .
A d a p t e r c u r r e n t s e n s e r e s i s t o r , n e g a t i v e i n p u t . A n o p t i o n a l 0 . 1 - F c e r a m i c c a p a c i t o r i s p l a c e d f r o m A C N p i n t o A G N D A C N 2 f o r c o m m o n - m o d e f i l t e r i n g . A n o p t i o n a l 0 . 1 - F c e r a m i c c a p a c i t o r i s p l a c e d f r o m A C N t o A C P t o p r o v i d e
d i f f e r e n t i a l - m o d e f i l t e r i n g .
A C P 3 A d a p t e r c u r r e n t s e n s e r e s i s t o r , p o s i t i v e i n p u t . ( S e e c o m m e n t s w i t h A C N d e s c r i p t i o n )
A C a d a p t e r t o s y s t e m - s w i t c h d r i v e r o u t p u t . C o n n e c t d i r e c t l y t o t h e g a t e o f t h e A C F E T P - c h a n n e l p o w e r M O S F E T a n d t h e r e v e r s e c o n d u c t i o n b l o c k i n g P - c h a n n e l p o w e r M O S F E T . C o n n e c t b o t h F E T s a s c o m m o n - s o u r c e . C o n n e c t t h e A C F E T d r a i n t o t h e s y s t e m - l o a d s i d e . T h e P V C C s h o u l d b e c o n n e c t e d t o t h e c o m m o n - s o u r c e n o d e t o e n s u r e t h a t t h e d r i v e r l o g i c i s a l w a y s a c t i v e w h e n n e e d e d . I f n e e d e d , a n o p t i o n a l c a p a c i t o r f r o m g a t e t o s o u r c e o f t h e A C F E T i s u s e d
A C D R V 4 t o s l o w d o w n t h e O N a n d O F F t i m e s . T h e i n t e r n a l g a t e d r i v e i s a s y m m e t r i c a l , a l l o w i n g a q u i c k t u r n - o f f a n d s l o w e r t u r n - o n i n a d d i t i o n t o t h e i n t e r n a l b r e a k - b e f o r e - m a k e l o g i c w i t h r e s p e c t t o t h e B A T D R V . T h e o u t p u t g o e s i n t o l i n e a r r e g u l a t i o n m o d e w h e n t h e i n p u t s e n s e d c u r r e n t e x c e e d s t h e A C O C t h r e s h o l d . A C D R V i s l a t c h e d o f f a f t e r A C O P v o l t a g e e x c e e d s 2 V , t o p r o t e c t t h e c h a r g i n g s y s t e m f r o m a n A C F E T - o v e r p o w e r c o n d i t i o n .
A d a p t e r d e t e c t e d v o l t a g e s e t i n p u t . P r o g r a m t h e a d a p t e r d e t e c t t h r e s h o l d b y c o n n e c t i n g a r e s i s t o r d i v i d e r f r o m a d a p t e r A C D E T 5 i n p u t t o A C D E T p i n t o A G N D p i n . A d a p t e r v o l t a g e i s d e t e c t e d i f A C D E T - p i n v o l t a g e i s g r e a t e r t h a n 2 . 4 V . T h e I A D A P T
c u r r e n t s e n s e a m p l i f i e r i s a c t i v e w h e n t h e A C D E T p i n v o l t a g e i s g r e a t e r t h a n 0 . 6 V .
A d a p t e r c u r r e n t s e t i n p u t . T h e v o l t a g e r a t i o o f A C S E T v o l t a g e v e r s u s V D A C v o l t a g e p r o g r a m s t h e i n p u t c u r r e n t r e g u l a t i o n s e t - p o i n t d u r i n g D y n a m i c P o w e r M a n a g e m e n t ( D P M ) . P r o g r a m b y c o n n e c t i n g a r e s i s t o r d i v i d e r f r o m V D A C
A C S E T 6 t o A C S E T t o A G N D ; o r b y c o n n e c t i n g t h e o u t p u t o f a n e x t e r n a l D A C t o t h e A C S E T p i n a n d c o n n e c t t h e D A C s u p p l y t o t h e V D A C p i n .
I n p u t p o w e r l i m i t s e t i n p u t . P r o g r a m t h e i n p u t o v e r - p o w e r t i m e c o n s t a n t b y p l a c i n g a c e r a m i c c a p a c i t o r f r o m A C O P t o A G N D . T h e c a p a c i t o r s e t s t h e t i m e t h a t t h e i n p u t c u r r e n t l i m i t , A C O C , c a n b e s u s t a i n e d b e f o r e e x c e e d i n g t h e
A C O P 7 p o w e r - M O S F E T p o w e r l i m i t . W h e n t h e A C O P v o l t a g e e x c e e d s 2 V , t h e n t h e A C D R V l a t c h e s o f f t o p r o t e c t t h e c h a r g e s y s t e m f r o m a n o v e r - p o w e r c o n d i t i o n , A C O P . R e s e t l a t c h b y t o g g l i n g A C D E T o r P V C C _ U V L O .
S e t i n p u t o v e r v o l t a g e p r o t e c t i o n t h r e s h o l d . C h a r g e i s d i s a b l e d a n d A C D R V i s t u r n e d o f f i f a d a p t e r i n p u t v o l t a g e i s h i g h e r t h a n t h e O V P S E T p r o g r a m m e d t h r e s h o l d . I n p u t o v e r v o l t a g e , A C O V , d i s a b l e s c h a r g e a n d A C D R V w h e n
O V P S E T 8 O V P S E T > 3 . 1 V . A C O V d o e s n o t l a t c h . P r o g r a m t h e o v e r v o l t a g e p r o t e c t i o n t h r e s h o l d b y c o n n e c t i n g a r e s i s t o r d i v i d e r f r o m a d a p t e r i n p u t t o O V P S E T p i n t o A G N D p i n .
A n a l o g g r o u n d . O n P C B l a y o u t , c o n n e c t t o t h e a n a l o g g r o u n d p l a n e , a n d o n l y c o n n e c t t o P G N D t h r o u g h t h e p o w e r A G N D 9
p a d u n d e r n e a t h t h e I C .
3 . 3 - V r e g u l a t e d v o l t a g e o u t p u t . P l a c e a 1 - F c e r a m i c c a p a c i t o r f r o m V R E F t o A G N D p i n c l o s e t o t h e I C . T h i s v o l t a g e V R E F 1 0
c o u l d b e u s e d f o r r a t i o m e t r i c p r o g r a m m i n g o f v o l t a g e a n d c u r r e n t r e g u l a t i o n .
C h a r g e v o l t a g e s e t r e f e r e n c e i n p u t . C o n n e c t t h e V R E F o r e x t e r n a l D A C v o l t a g e s o u r c e t o t h e V D A C p i n . B a t t e r y v o l t a g e , c h a r g e c u r r e n t , a n d i n p u t c u r r e n t a r e p r o g r a m m e d a s a r a t i o o f t h e V D A C p i n v o l t a g e v e r s u s t h e V A D J ,
V D A C 1 1 S R S E T , a n d A C S E T p i n v o l t a g e s , r e s p e c t i v e l y . P l a c e r e s i s t o r d i v i d e r s f r o m V D A C t o V A D J , S R S E T , a n d A C S E T p i n s t o A G N D f o r p r o g r a m m i n g . A D A C c o u l d b e u s e d b y c o n n e c t i n g t h e D A C s u p p l y t o V D A C a n d c o n n e c t i n g t h e o u t p u t t o V A D J , S R S E T , o r A C S E T .
C h a r g e v o l t a g e s e t i n p u t . T h e v o l t a g e r a t i o o f V A D J v o l t a g e v e r s u s V D A C v o l t a g e p r o g r a m s t h e b a t t e r y v o l t a g e r e g u l a t i o n s e t - p o i n t . P r o g r a m b y c o n n e c t i n g a r e s i s t o r d i v i d e r f r o m V D A C t o V A D J , t o A G N D ; o r , b y c o n n e c t i n g t h e
V A D J 1 2 o u t p u t o f a n e x t e r n a l D A C t o V A D J , a n d c o n n e c t t h e D A C s u p p l y t o V D A C . V A D J c o n n e c t e d t o R E G N p r o g r a m s t h e d e f a u l t o f 4 . 2 V p e r c e l l .
V a l i d a d a p t e r a c t i v e - l o w d e t e c t l o g i c o p e n - d r a i n o u t p u t . P u l l e d l o w w h e n I n p u t v o l t a g e i s a b o v e p r o g r a m m e d A C D E T . A C G O O D 1 3
C o n n e c t a 1 0 - k p u l l u p r e s i s t o r f r o m A C G O O D t o V R E F , o r t o a d i f f e r e n t p u l l u p - s u p p l y r a i l .
B a t t e r y t o s y s t e m s w i t c h d r i v e r o u t p u t . G a t e d r i v e f o r t h e b a t t e r y t o s y s t e m l o a d B A T P M O S p o w e r F E T t o i s o l a t e t h e s y s t e m f r o m t h e b a t t e r y t o p r e v e n t c u r r e n t f l o w f r o m t h e s y s t e m t o t h e b a t t e r y , w h i l e a l l o w i n g a l o w i m p e d a n c e p a t h f r o m b a t t e r y t o s y s t e m a n d w h i l e d i s c h a r g i n g t h e b a t t e r y p a c k t o t h e s y s t e m l o a d . C o n n e c t t h i s p i n d i r e c t l y t o t h e g a t e
B A T D R V 1 4 o f t h e i n p u t B A T P - c h a n n e l p o w e r M O S F E T . C o n n e c t t h e s o u r c e o f t h e F E T t o t h e s y s t e m l o a d v o l t a g e n o d e . C o n n e c t t h e d r a i n o f t h e F E T t o t h e b a t t e r y p a c k p o s i t i v e n o d e . A n o p t i o n a l c a p a c i t o r i s p l a c e d f r o m t h e g a t e t o t h e s o u r c e t o
s l o w d o w n t h e s w i t c h i n g t i m e s . T h e i n t e r n a l g a t e d r i v e i s a s y m m e t r i c a l t o a l l o w a q u i c k t u r n - o f f a n d s l o w e r t u r n - o n , i n a d d i t i o n t o t h e i n t e r n a l b r e a k - b e f o r e - m a k e l o g i c w i t h r e s p e c t t o A C D R V .
A d a p t e r c u r r e n t s e n s e a m p l i f i e r o u t p u t . I A D A P T v o l t a g e i s 2 0 t i m e s t h e d i f f e r e n t i a l v o l t a g e a c r o s s A C P - A C N . P l a c e a I A D A P T 1 5
1 0 0 - p F o r l e s s c e r a m i c d e c o u p l i n g c a p a c i t o r f r o m I A D A P T t o A G N D .
C h a r g e c u r r e n t s e t i n p u t . T h e v o l t a g e r a t i o o f S R S E T v o l t a g e v e r s u s V D A C v o l t a g e p r o g r a m s t h e c h a r g e c u r r e n t S R S E T 1 6 r e g u l a t i o n s e t - p o i n t . P r o g r a m b y c o n n e c t i n g a r e s i s t o r d i v i d e r f r o m V D A C t o S R S E T t o A G N D ; o r b y c o n n e c t i n g t h e
o u t p u t o f a n e x t e r n a l D A C t o S R S E T p i n a n d c o n n e c t t h e D A C s u p p l y t o V D A C p i n .
B a t t e r y v o l t a g e r e m o t e s e n s e . D i r e c t l y c o n n e c t a k e l v i n s e n s e t r a c e f r o m t h e b a t t e r y p a c k p o s i t i v e t e r m i n a l t o t h e B A T B A T 1 7 p i n t o a c c u r a t e l y s e n s e t h e b a t t e r y p a c k v o l t a g e . P l a c e a 0 . 1 - F c a p a c i t o r f r o m B A T t o A G N D c l o s e t o t h e I C t o f i l t e r
h i g h - f r e q u e n c y n o i s e .
4 S u b m i t D o c u m e n t a t i o n F e e d b a c k C o p y r i g h t 2 0 0 7 , 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 F o l d e r L i n k ( s ) : b q 2 4 7 5 1 A
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A B S O L U T E M A X I M U M R A T I N G S
b q 2 4 7 5 1 A S L U S 7 5 6 S E P T E M B E R 2 0 0 7
T a b l e 1 . T E R M I N A L F U N C T I O N S 2 8 - P I N Q F N ( c o n t i n u e d )
T E R M I N A L D E S C R I P T I O N
N A M E N O .
C h a r g e c u r r e n t s e n s e r e s i s t o r , n e g a t i v e i n p u t . A n o p t i o n a l 0 . 1 - F c e r a m i c c a p a c i t o r i s p l a c e d f r o m S R N p i n t o A G N D S R N 1 8 f o r c o m m o n - m o d e f i l t e r i n g . A n o p t i o n a l 0 . 1 - F c e r a m i c c a p a c i t o r i s p l a c e d f r o m S R N t o S R P t o p r o v i d e
d i f f e r e n t i a l - m o d e f i l t e r i n g .
S R P 1 9 C h a r g e c u r r e n t s e n s e r e s i s t o r , p o s i t i v e i n p u t . ( S e e c o m m e n t s f o r S R N . )
C E L L S 2 0 2 , 3 o r 4 c e l l s s e l e c t i o n l o g i c i n p u t . L o g i c l o w p r o g r a m s 3 c e l l . L o g i c h i g h p r o g r a m s 4 c e l l . F l o a t i n g p r o g r a m s 2 c e l l .
L e a r n m o d e l o g i c i n p u t c o n t r o l p i n l o g i c h i g h t o o v e r r i d e s y s t e m s e l e c t o r w h e n a d a p t e r i s p r e s e n t , t h e b a t t e r y i s d i s c h a r g e d t o r e c a l i b r a t e t h e b a t t e r y - p a c k g a s g a u g e . W h e n a d a p t e r i s p r e s e n t a n d L E A R N i s h i g h , b a t t e r y c h a r g i n g i s d i s a b l e d , t h e a d a p t e r i s d i s c o n n e c t e d ( A C D R V i s o f f ) , a n d t h e b a t t e r y i s c o n n e c t e d t o s y s t e m ( B A T D R V i s o n ) . S s y t e m
L E A R N 2 1 s e l e c t o r a u t o m a t i c a l l y s w i t c h e s t o a d a p t e r i f b a t t e r y i s d i s c h a r g e d b e l o w L O W B A T ( 3 V ) . W h e n a d a p t e r i s p r e s e n t a n d L E A R N i s l o w , t h e a d a p t e r i s c o n n e c t e d t o s y s t e m i n n o r m a l s e l e c t o r l o g i c ( A C D R V i s o n a n d B A T D R V i s o f f ) , a l l o w i n g b a t t e r y c h a r g i n g . I f a d a p t e r i s n o t p r e s e n t , t h e b a t t e r y i s a l w a y s c o n n e c t e d t o t h e s y s t e m ( A C D R V i s o f f a n d B A T D R V i s o n ) .
P o w e r g r o u n d . O n P C B l a y o u t , c o n n e c t d i r e c t l y t o s o u r c e o f l o w - s i d e p o w e r M O S F E T , t o g r o u n d c o n n e c t i o n o f i n p u t P G N D 2 2
a n d o u t p u t c a p a c i t o r s o f t h e c h a r g e r . O n l y c o n n e c t t o A G N D t h r o u g h t h e p o w e r p a d u n d e r n e a t h t h e I C .
L O D R V 2 3 P W M l o w s i d e d r i v e r o u t p u t . C o n n e c t t o t h e g a t e o f t h e l o w - s i d e p o w e r M O S F E T w i t h a s h o r t t r a c e .
P W M l o w s i d e d r i v e r p o s i t i v e 6 - V s u p p l y o u t p u t . C o n n e c t a 1 - F c e r a m i c c a p a c i t o r f r o m R E G N t o P G N D , c l o s e t o t h e R E G N 2 4
I C . U s e f o r h i g h - s i d e d r i v e r b o o t s t r a p v o l t a g e b y c o n n e c t i n g a s m a l l - s i g n a l S c h o t t k y d i o d e f r o m R E G N t o B T S T .
P W M h i g h s i d e d r i v e r n e g a t i v e s u p p l y . C o n n e c t t o t h e p h a s e s w i t c h i n g n o d e ( j u n c t i o n o f t h e l o w - s i d e p o w e r M O S F E T P H 2 5 d r a i n , h i g h - s i d e p o w e r M O S F E T s o u r c e , a n d o u t p u t i n d u c t o r ) . C o n n e c t t h e 0 . 1 - F b o o t s t r a p c a p a c i t o r f r o m f r o m P H t o
B T S T .
H I D R V 2 6 P W M h i g h s i d e d r i v e r o u t p u t . C o n n e c t t o t h e g a t e o f t h e h i g h - s i d e p o w e r M O S F E T w i t h a s h o r t t r a c e .
P W M h i g h s i d e d r i v e r p o s i t i v e s u p p l y . C o n n e c t a 0 . 1 - F b o o t s t r a p c e r a m i c c a p a c i t o r f r o m B T S T t o P H . C o n n e c t a B T S T 2 7
s m a l l b o o t s t r a p S c h o t t k y d i o d e f r o m R E G N t o B T S T .
I C p o w e r p o s i t i v e s u p p l y . C o n n e c t t o t h e c o m m o n - s o u r c e ( d i o d e - O R ) p o i n t : s o u r c e o f h i g h - s i d e P - c h a n n e l M O S F E T P V C C 2 8 a n d s o u r c e o f r e v e r s e - b l o c k i n g p o w e r P - c h a n n e l M O S F E T . P l a c e a 1 - F c e r a m i c c a p a c i t o r f r o m P V C C t o P G N D p i n
c l o s e t o t h e I C .
o v e r o p e r a t i n g f r e e - a i r 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 ) ( 2 )
V A L U E U N I T P V C C , A C P , A C N , S R P , S R N , B A T , B A T D R V , A C D R V 0 . 3 t o 3 0
P H 1 t o 3 0
R E G N , L O D R V , V R E F , V D A C , V A D J , A C S E T , S R S E T , A C D E T , A C O P , 0 . 3 t o 7 V o l t a g e r a n g e
C H G E N , C E L L S , S T A T , A C G O O D , L E A R N , O V P S E T V
V R E F , I A D A P T 0 . 3 t o 3 . 6
B T S T , H I D R V w i t h r e s p e c t t o A G N D a n d P G N D 0 . 3 t o 3 6
M a x i m u m d i f f e r e n c e v o l t a g e A C P A C N , S R P S R N , A G N D P G N D 0 . 5 t o 0 . 5
J u n c t i o n t e m p e r a t u r e r a n g e 4 0 t o 1 5 5 C
S t o r a g e t e m p e r a t u r e r a n g e 5 5 t o 1 5 5 C
( 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 s a r e w i t h r e s p e c t t o G N D i f n o t s p e c i f i e d . C u r r e n t s a r e p o s i t i v e i n t o , n e g a t i v e o u t o f t h e s p e c i f i e d t e r m i n a l . C o n s u l t P a c k a g i n g S e c t i o n o f t h e d a t a b o o k f o r t h e r m a l l i m i t a t i o n s a n d c o n s i d e r a t i o n s o f p a c k a g e s .
C o p y r i g h t 2 0 0 7 , 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 S u b m i t D o c u m e n t a t i o n F e e d b a c k 5
P r o d u c t F o l d e r L i n k ( s ) : b q 2 4 7 5 1 A
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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
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V B A T _ R E G _ R N G B A T v o l t a g e r e g u l a t i o n r a n g e 4 - 4 . 5 1 2 V p e r c e l l , t i m e s 2 , 3 , 4 c e l l s 8 1 8 . 0 4 V 8
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d e t e c t e d ( a f t e r A C D E T > 2 . 4 ) A C S W I T C H ( A C D R V ) D R I V E R
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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 ) 7 . 0 V V P V C C 2 4 V , 0 C < T J < + 1 2 5 C , t y p i c a l v a l u e s a r e a t T A = 2 5 C , w i t h r e s p e c t t o A G N D ( 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
Q U I E S C E N T C U R R E N T
I O F F _ S T A T E T o t a l o f f - s t a t e b a t t e r y c u r r e n t f r o m V B A T = 1 6 . 8 V , V A C D E T < 0 . 6 V , 7 1 0 S R P , S R N , B A T , V C C , B T S T , P H , V P V C C > 5 V , T J = 0 t o 8 5 C A
e t c .
I B A T _ O N B a t t e r y o n - s t a t e q u i e s c e n t c u r r e n t V B A T = 1 6 . 8 V , 0 . 6 V < V A C D E T < 2 . 4 V , 1 m A V P V C C > 5 V
I B A T _ L O A D _ C D I n t e r n a l b a t t e r y l o a d c u r r e n t , c h a r g e C h a r g e i s d i s a b l e d : 1 0 0 2 0 0 Ad i s b l e d V B A T = 1 6 . 8 V , V A C D E T > 2 . 4 V ,
V P V C C > 5 V
I B A T _ L O A D _ C E I n t e r n a l b a t t e r y l o a d c u r r e n t , c h a r g e C h a r g e i s e n a b l e d : 6 1 0 1 2 m A e n a b l e d V B A T = 1 6 . 8 V , V A C D E T > 2 . 4 V ,
V P V C C > 5 V
IA C A d a p t e r q u i e s c e n t c u r r e n t V P V C C = 2 0 V , c h a r g e d i s a b l e d 1 1 . 5 m A
I A C _ S W I T C H A d a p t e r s w i t c h i n g q u i e s c e n t c u r r e n t V P V C C = 2 0 V , C h a r g e e n a b l e d , c o n v e r t e r 2 5 m A r u n n i n g , t o t a l g a t e c h a r g e = 2 1 0 n C
I N T E R N A L S O F T S T A R T ( 8 s t e p s t o r e g u l a t i o n c u r r e n t )
S o f t s t a r t s t e p s 8 s t e p
S o f t s t a r t s t e p t i m e 1 . 7 m s
C H A R G E R S E C T I O N P O W E R - U P S E Q U E N C I N G
C h a r g e - e n a b l e d e l a y a f t e r p o w e r - u p D e l a y f r o m w h e n a d a p t e r i s d e t e c t e d t o 5 1 8 7 0 0 9 0 8 m s w h e n t h e c h a r g e r i s a l l o w e d t o t u r n o n
L O G I C I N P U T P I N C H A R A C T E R I S T I C S ( C H G E N , L E A R N )
V I N _ L O I n p u t l o w t h r e s h o l d v o l t a g e 0 . 8 V
V I N _ H I I n p u t h i g h t h r e s h o l d v o l t a g e 2 . 1
V B I A S I n p u t b i a s c u r r e n t V C H G E N = 0 t o V R E G N 1 A
t C H G E N _ D E G L I T C H C h a r g e e n a b l e d e g l i t c h t i m e , C H G E N A C D E T > 2 . 4 V , C H G E N r i s i n g 2 m s f a l l i n g = e n a b l i n g c h a r g e
L O G I C I N P U T P I N C H A R A C T E R I S T I C S ( C E L L S )
V I N _ L O I n p u t l o w t h r e s h o l d v o l t a g e , 3 c e l l s C E L L S v o l t a g e f a l l i n g e d g e 0 . 5
V I N _ M I D I n p u t m i d t h r e s h o l d v o l t a g e , 2 c e l l s C E L L S v o l t a g e r i s i n g f o r M I N , 0 . 8 1 . 8 VC E L L S v o l t a g e f a l l i n g f o r M A X
V I N _ H I I n p u t h i g h t h r e s h o l d v o l t a g e , 4 c e l l s C E L L S v o l t a g e r i s i n g 2 . 5
I B I A S _ F L O A T I n p u t b i a s f l o a t c u r r e n t f o r 2 - c e l l V C H G E N = 0 t o V R E G N 1 1 As e l e c t i o n
O P E N - D R A I N L O G I C O U T P U T P I N C H A R A C T E R I S T I C S ( A C G O O D )
V O U T _ L O O u t p u t l o w s a t u r a t i o n v o l t a g e S i n k C u r r e n t = 5 m A 0 . 5 V
D e l a y , A C G O O D f a l l i n g 5 1 8 7 0 0 9 0 8 m s
D e l a y , A C G O O D r i s i n g 1 0 m s
1 0 S u b m i t D o c u m e n t a t i o n F e e d b a c k C o p y r i g h t 2 0 0 7 , 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 F o l d e r L i n k ( s ) : b q 2 4 7 5 1 A
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T Y P I C A L C H A R A T E R I S T I C S
b q 2 4 7 5 1 A S L U S 7 5 6 S E P T E M B E R 2 0 0 7
T a b l e o f G r a p h s ( 1 )
Y X F I g u r e
V R E F L o a d a n d L i n e R e g u l a t i o n v s L o a d C u r r e n t F i g u r e 3
R E G N L o a d a n d L i n e R e g u l a t i o n v s L o a d C u r r e n t F i g u r e 4
B A T V o l t a g e v s V A D J / V D A C R a t i o F i g u r e 5
C h a r g e C u r r e n t v s S R S E T / V D A C R a t i o F i g u r e 6
I n p u t C u r r e n t v s A C S E T / V D A C R a t i o F i g u r e 7
B A T V o l t a g e R e g u l a t i o n A c c u r a c y v s C h a r g e C u r r e n t F i g u r e 8
B A T V o l t a g e R e g u l a t i o n A c c u r a c y F i g u r e 9
C h a r g e C u r r e n t R e g u l a t i o n A c c u r a c y F i g u r e 1 0
I n p u t C u r r e n t R e g u l a t i o n ( D P M ) A c c u r a c y F i g u r e 1 1
V I A D A P T I n p u t C u r r e n t S e n s e A m p l i f i e r A c c u r a c y F i g u r e 1 2
I n p u t R e g u l a t i o n C u r r e n t ( D P M ) , a n d C h a r g e C u r r e n t v s S y s t e m C u r r e n t F i g u r e 1 3
T r a n s i e n t S y s t e m L o a d ( D P M ) R e s p o n s e F i g u r e 1 4
C h a r g e C u r r e n t R e g u l a t i o n v s B A T V o l t a g e F i g u r e 1 5
E f f i c i e n c y v s B a t t e r y C h a r g e C u r r e n t F i g u r e 1 6 B a t t e r y R e m o v a l ( f r o m C o n s t a n t C u r r e n t M o d e ) F i g u r e 1 7
A C D R V a n d B A T D R V S t a r t u p F i g u r e 1 8
R E F a n d R E G N S t a r t u p F i g u r e 1 9
S y s t e m S e l e c t o r o n A d a p t e r I n s e r t i o n w i t h 3 9 0 - F S Y S - t o - P G N D S y s t e m C a p a c i t o r F i g u r e 2 0
S y s t e m S e l e c t o r o n A d a p t e r R e m o v a l w i t h 3 9 0 - F S Y S - t o - P G N D S y s t e m C a p a c i t o r F i g u r e 2 1
S y s t e m S e l e c t o r L E A R N T u r n - O n w i t h 3 9 0 - F S Y S - t o - P G N D S y s t e m C a p a c i t o r F i g u r e 2 2
S y s t e m S e l e c t o r L E A R N T u r n - O f f w i t h 3 9 0 - F S Y S - t o - P G N D S y s t e m C a p a c i t o r F i g u r e 2 3
S y s t e m S e l e c t o r o n A d a p t e r I n s e r t i o n F i g u r e 2 4
S e l e c t o r G a t e D r i v e V o l t a g e s , 7 0 0 m s d e l a y a f t e r A C D E T F i g u r e 2 5
S y s t e m S e l e c t o r w h e n A d a p t e r R e m o v e d F i g u r e 2 6
C h a r g e E n a b l e / D i s a b l e a n d C u r r e n t S o f t - S t a r t F i g u r e 2 7
N o n s y n c h r o n o u s t o S y n c h r o n o u s T r a n s i t i o n F i g u r e 2 8
S y n c h r o n o u s t o N o n s y n c h r o n o u s T r a n s i t i o n F i g u r e 2 9
N e a r 1 0 0 % D u t y C y c l e B o o t s t r a p R e c h a r g e P u l s e F i g u r e 3 0
B a t t e r y S h o r t e d C h a r g e r R e s p o n s e , O v e r C u r r e n t P r o t e c t i o n ( O C P ) a n d C h a r g e C u r r e n t R e g u l a t i o n F i g u r e 3 1
C o n t i n u o u s C o n d u c t i o n M o d e ( C C M ) S w i t c h i n g W a v e f o r m s F i g u r e 3 2
D i s c o n t i n u o u s C o n d u c t i o n M o d e ( D C M ) S w i t c h i n g W a v e f o r m s F i g u r e 3 3
( 1 ) T e s t r e s u l t s b a s e d o n F i g u r e 2 a p p l i c a t i o n s c h e m a t i c . V I N = 2 0 V , V B A T = 3 - c e l l L i I o n , I C H G = 3 A , I A D A P T E R _ L I M I T = 4 A , T A = 2 5 C , u n l e s s o t h e r w i s e s p e c i f i e d .
C o p y r i g h t 2 0 0 7 , 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 S u b m i t D o c u m e n t a t i o n F e e d b a c k 1 1
P r o d u c t F o l d e r L i n k ( s ) : b q 2 4 7 5 1 A
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-0.20
-0.10
0
0.10
0.20
0.30
0.40
0.50
0 10 20 30 40 50
VREF - Load Current - mA
RegulationError-
%
PVCC = 10 V
PVCC = 20 V
-3
-2.50
-2
-1.50
-1
-0.50
0
0 10 20 30 40 50 60 70 80
REGN - Load Current - mA
RegulationError-%
PVCC = 10 V
PVCC = 20 V
0
1
2
3
4
5
6
7
8
9
10
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
SRSET/VDAC Ratio
ChargeCurrentRegulation-A
SRSET Varied,
4-Cell,
Vbat = 16 V
16
16.2
16.4
16.6
16.8
17
17.2
17.4
17.6
17.8
18
18.2
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
VADJ/VDAC Ratio
VoltageRegulation-V
VADJ = 0 -VDAC,
4-Cell,
No Load
V = 16.8 Vreg
-0.2
-0.1
0
0.1
0.2
0 2000 4000 6000 8000
Charge Current - mA
RegulationError-%
0
1
2
3
4
6
7
8
9
10
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
ACSET/VDAC Ratio
InputCurrentRegulation-A
ACSET Varied,
4-Cell,
Vbat = 16 V
5
b q 2 4 7 5 1 AS L U S 7 5 6 S E P T E M B E R 2 0 0 7
V R E F L O A D A N D L I N E R E G U L A T I O N R E G N L O A D A N D L I N E R E G U L A T I O N v s v s
L o a d C u r r e n t L O A D C U R R E N T
F i g u r e 3 . F i g u r e 4 .
B A T V O L T A G E C H A R G E C U R R E N T v s v s
V A D J / V D A C R A T I O S R S E T / V D A C R A T I O
F i g u r e 5 . F i g u r e 6 .
I N P U T C U R R E N T B A T V O L T A G E R E G U L A T I O N A C C U R A C Y v s v s
A C S E T / V D A C R A T I O C H A R G E C U R R E N T
F i g u r e 7 . F i g u r e 8 .
1 2 S u b m i t D o c u m e n t a t i o n F e e d b a c k C o p y r i g h t 2 0 0 7 , 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 F o l d e r L i n k ( s ) : b q 2 4 7 5 1 A
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SRSET Varied
-10
-9
-8
-7
-6
-5
-4-3
-2
-1
0
1
2
0 2 4 6 8
I Setpoint - A(CHRG)-
RegulationErr
or-%
4-Cell, VBAT = 16 VVADJ = 0 -VDAC
-0.10
-0.08
-0.06
-0.04
-0.02
0
0.02
0.04
0.06
0.08
0.10
16.5 17 17.5 18 18.5 19
V - Setpoint - V(BAT)
RegulationError-%
4-Cell, no load
ACSET Varied
-2
-1
0
1
2
3
4
5
6
7
8
9
10
0 1 2 3 4 5 6
Input Current Regulation Setpoint - A
RegulationError-%
4-Cell, VBAT = 16 V
Iadapt Amplifier Gain
-25
-20
-15
-10
-5
0
5
0 1 2 3 4 5 6 7 8 9 10
I - A(ACPWR)
PercentError
V = 20 V, CHG = ENI
V = 20 V, CHG = DISI
V = 20 V,
4-Cell,V = 16 V
I
bat
0
1
2
3
4
5
0 1 2 3 4System Current - A
IchrgandIin-A
Input Current
Charge Current
b q 2 4 7 5 1 A S L U S 7 5 6 S E P T E M B E R 2 0 0 7
B A T V O L T A G E R E G U L A T I O N A C C U R A C Y C H A R G E C U R R E N T R E G U L A T I O N A C C U R A C Y
F i g u r e 9 . F i g u r e 1 0 .
I N P U T C U R R E N T R E G U L A T I O N ( D P M ) A C C U R A C Y V I A D A P T I N P U T C U R R E N T S E N S E A M P L I F I E R A C C U R A C Y
F i g u r e 1 1 . F i g u r e 1 2 .
I N P U T R E G U L A T I O N C U R R E N T ( D P M ) , A N D C H A R G E C U R R E N T
v sS Y S T E M C U R R E N T T R A N S I E N T S Y S T E M L O A D ( D P M ) R E S P O N S E
F i g u r e 1 3 . F i g u r e 1 4 .
C o p y r i g h t 2 0 0 7 , 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 S u b m i t D o c u m e n t a t i o n F e e d b a c k 1 3
P r o d u c t F o l d e r L i n k ( s ) : b q 2 4 7 5 1 A
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V = 20 V,
Ichrg_set = 4 A,T = 20 C
in
A
0
1
2
3
4
5
0 2 4 6 8 10 12 14 16 18
Battery Voltage - V
ChargeCurrent-A
70
80
90
100
0 2000 4000 6000 8000
Battery Charge Current - mA
Efficiency-%
V = 12.6 Vreg
V = 16.8 V(BAT)
V = 8 .4 Vreg
Ch2
20V/div
t Time = 400 s/div
Ch1
20V/div
Ch4
10V/div