bq 24703

8/9/2019 Bq 24703

1/37

1

F E A T U R E S D E S C R I P T I O N

1

2

3

4

5

6

7

8

9

10

11

12

24

23

22

21

20

19

18

17

16

15

14

13

ACDETACPRES

ACSEL

BATDEP

SRSET

ACSET

VREF

ENABLE

BATSET

COMP

ACN

ACP

ACDRVBATDRV

VCC

PWM

VHSP

ALARM

VS

GND

SRP

SRN

IBAT

BATP

bq24702, bq24703

PW PACKAGE

(TOP VIEW)

8

9

10

11

12

13

14

ACSEL

ACPRES

ACDET

ACDRV

BATDRV

NC

VCC

ACN

ACP

NC

NC

BATP

IBAT

NC

28

27

26

25

24

23

22

1 2 3 4 5 6 7

B A T D E P

S R S E T

A C S E T

V R E F

E N A B L E

B A T S E T

C O M P

P W M

V H S P

A L A R M V S

G N D

S R P

S R N

2 1

2 0

1 9

1 8

1 7

1 6

1 5

bq24703

RHD PACKAGE

(BOTTOM VIEW)

NC - No internal connection

b q 2 4 7 0 2 b q 2 4 7 0 3

S L U S 5 5 3 E – M A Y 2 0 0 3 – R E V I S E D O C T O B E R 2 0 0 7 w w w . t i . c o m

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 C O N T R O L L E R A N D

S Y S T E M P O W E R S E L E C T O R

• 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 M i n i m i z e s

B a t t e r y C h a r g e T i m e T h e b q 2 4 7 0 2 / b q 2 4 7 0 3 i s a h i g h l y i n t e g r a t e d b a t t e r y c h a r g e c o n t r o l l e r a n d s e l e c t o r t a i l o r e d f o r n o t e b o o k • I n t e g r a t e d S e l e c t o r S u p p o r t s B a t t e r y a n d s u b - n o t e b o o k P C a p p l i c a t i o n s . C o n d i t i o n i n g a n d S m a r t B a t t e r y L e a r n C y c l e

• Z e r o V o l t O p e r a t i o n T h e b q 2 4 7 0 2 / b q 2 4 7 0 3 u s 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 ) t o m i n i m i z e b a t t e r y c h a r g e t i m e • S e l e c t o r F e e d b a c k C i r c u i t E n s u r e s b y m a x i m i z i n g u s e o f a v a i l a b l e w a l l - a d a p t e r p o w e r . B r e a k - B e f o r e - M a k e T r a n s i t i o n T h i s i s a c h i e v e d b y d y n a m i c a l l y a d j u s t i n g t h e b a t t e r y

• ± 0 . 4 % C h a r g e V o l t a g e A c c u r a c y , S u i t a b l e f o r c h a r g e c u r r e n t b a s e d o n t h e t o t a l s y s t e m ( a d a p t e r ) C h a r g i n g L i - I o n C e l l s c u r r e n t .

• ± 4 % C h a r g e C u r r e n t A c c u r a c y T h e b q 2 4 7 0 2 / b q 2 4 7 0 3 u s e s a f i x e d f r e q u e n c y , p u l s e

• 3 0 0 - k H z I n t e g r a t e d P W M C o n t r o l l e r f o r w i d t h m o d u l a t o r ( P W M ) t o a c c u r a t e l y c o n t r o l b a t t e r y H i g h - E f f i c i e n c y B u c k R e g u l a t i o n c h a r g e c u r r e n t a n d v o l t a g e . C h a r g e c u r r e n t l i m i t s c a n

b e p r o g r a m m e d f r o m a k e y b o a r d c o n t r o l l e r D A C o r • D e p l e t e d B a t t e r y D e t e c t i o n a n d I n d i c a t i o n t o b y e x t e r n a l r e s i s t o r d i v i d e r s f r o m t h e p r e c i s i o n 5 - V , P r o t e c t B a t t e r y F r o m O v e r D i s c h a r g e ± 0 . 6 % , e x t e r n a l l y b y p a s s e d v o l t a g e r e f e r e n c e

• 2 0 - μ A S l e e p M o d e C u r r e n t f o r L o w B a t t e r y ( V R E F ) , s u p p l i e d b y t h e b q 2 4 7 0 2 / b q 2 4 7 0 3 . D r a i n

• 2 4 - P i n T S S O P P a c k a g e a n d 5 m m × 5 m m Q F N

p a c k a g e ( b q 2 4 7 0 3 o n l y )

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 3 – 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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D E S C R I P T I O N ( C O N T I N U E D )

D I S S I P A T I O N R A T I N G S

0

0.20

0.40

0.60

0.80

1

1.20

1.40

1.60

25 50 70 85

MAX Pd (W) @ 500 LFM



MAX Pd (W) @ 0 LFM

θJA = 89.37 C/W @ 0 LFM,

θJA = 77.98 C/W @ 150 LFM,

θJA = 73.93 C/W @ 250 LFM,

θJA = 68.23 C/W @ 500 LFM M a x i m u m P o w e r D i s s i p a

t i o n ( H i g h K B o a r d ) - W

MAXIMUM POWER DISSIPATION

(HIGH K BOARD)

vs

FREE-AIR TEMPERATURE

TA - Free-Air Temperature - °C

0

0.20

0.40

0.60

0.80

1

1.20

1.40

25 50 70 85




MAX Pd (W) @ 0 LFM

θJA = 150.17 C/W @ 0 LFM,

θJA = 110.95 C/W @ 150 LFM,

θJA = 99.81 C/W @ 250 LFM,

θJA = 86.03 C/W @ 500 LFM M a x i m u m P o w e r D i s s i p a t i o n ( L o w K B o a r d ) - W

MAXIMUM POWER DISSIPATION

(LOW K BOARD)

vs

FREE-AIR TEMPERATURE

TA - Free-Air Temperature - °C

b q 2 4 7 0 2 b q 2 4 7 0 3 S L U S 5 5 3 E – M A Y 2 0 0 3 – R E V I S E D O C T O 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 a t t e r y v o l t a g e l i m i t c a n b e p r o g r a m m e d b y u s i n g t h e i n t e r n a l 1 . 1 9 6 - V , ± 0 . 5 % p r e c i s i o n r e f e r e n c e , m a k i n g i t

s u i t a b l e f o r t h e c r i t i c a l c h a r g i n g d e m a n d s o f l i t h i u m - i o n c e l l s . A l s o , t h e b q 2 4 7 0 2 / b q 2 4 7 0 3 p r o v i d e s a n o p t i o n t o o v e r r i d e t h e p r e c i s i o n r e f e r e n c e a n d d r i v e t h e e r r o r a m p l i f i e r e i t h e r d i r e c t l y f r o m a n e x t e r n a l r e f e r e n c e o r f r o m a r e s i s t o r d i v i d e r o f f t h e 5 V s u p p l i e d b y t h e i n t e g r a t e d c i r c u i t .

T h e s e l e c t o r f u n c t i o n a l l o w s t h e m a n u a l s e l e c t i o n o f t h e s y s t e m p o w e r s o u r c e , b a t t e r y o r w a l l - a d a p t e r p o w e r . T h e b q 2 4 7 0 2 / b q 2 4 7 0 3 s u p p o r t s b a t t e r y - c o n d i t i o n i n g a n d b a t t e r y - l e a r n c y c l e s t h r o u g h t h e A C S E L f u n c t i o n . T h e

A C S E L f u n c t i o n a l l o w s m a n u a l s e l e c t i o n o f t h e b a t t e r y o r w a l l p o w e r a s t h e m a i n s y s t e m p o w e r . I t a l s o p r o v i d e s a u t o n o m o u s s w i t c h i n g t o t h e r e m a i n i n g s o u r c e ( b a t t e r y o r a c p o w e r ) s h o u l d t h e s e l e c t e d s y s t e m p o w e r s o u r c e t e r m i n a t e ( r e f e r t o A v a i l a b l e O p t i o n s t a b l e f o r t h e d i f f e r e n c e s b e t w e e n t h e b q 2 4 7 0 2 a n d t h e b q 2 4 7 0 3 ) . T h e b q 2 4 7 0 2 / b q 2 4 7 0 3 a l s o p r o v i d e s a n a l a r m f u n c t i o n t o i n d i c a t e a d e p l e t e d b a t t e r y c o n d i t i o n .

T h e b q 2 4 7 0 2 / b q 2 4 7 0 3 P W M c o n t r o l l e r i s i d e a l l y s u i t e d f o r o p e r a t i o n i n a b u c k c o n v e r t e r f o r a p p l i c a t i o n s w h e n t h e w a l l - a d a p t e r v o l t a g e i s g r e a t e r t h a n t h e b a t t e r y v o l t a g e .

A . T h e J E D E C l o w K ( 1 s ) b o a r d d e s i g n u s e d t o d e r i v e t h i s d a t a w a s a 3 - i n c h × 3 - i n c h , t w o l a y e r b o a r d w i t h 2 o u n c e

c o p p e r t r a c e s o n t o p o f t h e b o a r d .

B . T h e J E D E C h i g h K ( 1 s ) b o a r d d e s i g n u s e d t o d e r i v e t h i s d a t a w a s a 3 - i n c h × 3 - i n c h , m u l t i l a y e r b o a r d w i t h 1 o u n c e i n t e r n a l p o w e r a n d g r o u n d p l a n e s a n d 2 o u n c e c o p p e r t r a c e s o n t o p a n d b o t t o m o f t h e b o a r d .

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 3 – 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 0 2 b q 2 4 7 0 3

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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 0 2 b q 2 4 7 0 3

S L U S 5 5 3 E – M A Y 2 0 0 3 – R E V I S E D O C T O B E R 2 0 0 7

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

S E L E C T O R O P E R A T I O N C O N D I T I O N 2 0 ° C ≤ T J ≤ 1 2 5 ° C b q 2 4 7 0 2 P W b q 2 4 7 0 3 R H D

B A T T E R Y A S P O W E R S O U R C E

B a t t e r y r e m o v a l A u t o m a t i c a l l y s e l e c t s a c + a l a r m A u t o m a t i c a l l y s e l e c t s a c + a l a r m

B a t t e r y r e i n s e r t e d S e l e c t i o n b a s e d o n s e l e c t o r i n p u t s A d a p t e r l a t c h e d u n t i l a d a p t e r i s r e m o v e d o r a c s e l e c t t o g g l e s . A C A S P O W E R S O U R C E

A C r e m o v a l A u t o m a t i c a l l y s e l e c t s b a t t e r y A u t o m a t i c a l l y s e l e c t s b a t t e r y

A C r e i n s e r t e d S e l e c t i o n b a s e d o n s e l e c t o r i n p u t s S e l e c t i o n b a s e d o n s e l e c t o r i n p u t s

D E P L E T E D B A T T E R Y C O N D I T I O N

B a t t e r y a s p o w e r s o u r c e S e n d s A L A R M s i g n a l A u t o m a t i c a l l y s e l e c t s a c S e n d s A L A R M s i g n a l

A C a s p o w e r s o u r c e S e n d s A L A R M s i g n a l S e n d s A L A R M s i g n a l

A L A R M S I G N A L A C T I V E

D e p l e t e d b a t t e r y c o n d i t i o n D e p l e t e d b a t t e r y c o n d i t i o n

W h e n s e l e c t o r i n p u t i s n o t e q u a l t o s e l e c t o r o u t p u t ( s i n g l e p u l s e a l a r m )

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

V C C S u p p l y v o l t a g e r a n g e – 0 . 3 t o 3 0 V

B a t t e r y v o l t a g e r a n g e : S R P , S R N – 0 . 3 t o 3 0 V

I n p u t v o l t a g e : A C N , A C P – 0 . 3 t o 3 0 V

T J 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 r a n g e – 4 0 t o 1 2 5 ° C

M a x i m u m s o u r c e / s i n k c u r r e n t V H S P 5 0 m A

M a x i m u m r a m p r a t e f o r V C C 1 0 V / μ s

M a x i m u m s i n k c u r r e n t A C P R E S , C O M P , A L A R M 2 . 5 m A

M a x i m u m r a m p r a t e f o r V ( B A T ) 1 0 V / μ s

M a x i m u m s o u r c e / s i n k c u r r e n t B A T D R V 1 0 m A

M a x i m u m s o u r c e / s i n k c u r r e n t A C D R V 1 0 m A

M a x i m u m s o u r c e / s i n k c u r r e n t P W M 5 0 m A

M a x i m u m s o u r c e / s i n k c u r r e n t p u l s e d A C D R V , ( 1 0 - μ s r i s e t i m e , 1 0 - μ s f a l l t i m e , 1 - m s 5 0 m A

p u l s e w i d t h , s i n g l e p u l s e )

M a x i m u m s o u r c e c u r r e n t V R E F 3 0 m A

M a x i m u m s o u r c e c u r r e n t S R P 1 0 0 m A

M a x i m u m d i f f e r e n c e v o l t a g e S R P – S R N 3 0 V

T s t g S t o r a g e t e m p e r a t u r e r a n g e – 6 5 t o 1 5 0 ° 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 r o u n d . C u r r e n t s a r e p o s i t i v e i n t o a n d 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 s . C o n s u l t t h e 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 t h e p a c k a g e .

C o p y r i g h t © 2 0 0 3 – 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


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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


( T A = T O P R ) a l l v o l t a g e s r e l a t i v e t o V S S

M I N M A X U N I T

A n a l o g a n d P W M o p e r a t i o n 7 2 8 S u p p l y v o l t a g e , ( V C C ) V

S e l e c t o r o p e r a t i o n 4 . 5 2 8

N e g a t i v e a c c u r r e n t s e n s e , ( A C N ) 7 2 8 V P o s i t i v e a c c u r r e n t s e n s e , ( A C P ) 7 2 8 V

N e g a t i v e b a t t e r y c u r r e n t s e n s e , ( S R N ) 5 2 8 V

P o s i t i v e b a t t e r y c u r r e n t s e n s e , ( S R P ) 5 2 8 V

A C o r a d a p t e r p o w e r d e t e c t i o n ( A C D E T ) 0 5 V

A C p o w e r i n d i c a t o r ( A C P R E S ) 0 5 V

A C a d a p t e r p o w e r s e l e c t ( A C S E L ) 0 5 V

D e p l e t e d b a t t e r y l e v e l ( B A T D E P ) 0 5 V

B a t t e r y c h a r g e c u r r e n t p r o g r a m m i n g v o l t a g e ( S R S E T ) 0 2 . 5 V

C h a r g e e n a b l e ( E N A B L E ) 0 5 V

E x t e r n a l o v e r r i d e t o a n i n t e r n a l 0 . 5 % p r e c i s i o n r e f e r e n c e ( B A T S E T ) 0 2 . 5 V

I n v e r t i n g i n p u t t o t h e P W M c o m p a r a t o r ( C O M P ) 0 5 V

B a t t e r y c h a r g e r e g u l a t i o n v o l t a g e m e a s u r e m e n t i n p u t t o t h e b a t t e r y — v o l t a g e g m a m p l i f i e r ( B A T P ) 0 5 V

B a t t e r y c u r r e n t d i f f e r e n t i a l a m p l i f i e r o u t p u t ( I B A T ) 0 5 V

S y s t e m l o a d v o l t a g e i n p u t p i n ( V S ) 0 2 . 5 V

D e p l e t e d b a t t e r y a l a r m o u t p u t ( A L A R M ) 0 5 V

G a t e d r i v e o u t p u t ( P W M ) V H S P V C C V

B a t t e r y p o w e r s o u r c e s e l e c t o u t p u t ( B A T D R V ) 0 2 8 V

A C o r a d a p t e r p o w e r s o u r c e s e l e c t i o n o u t p u t ( A C D R V ) V H S P V C C V

A C S E T 0 2 . 5 V

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 , T A - 4 0 8 5 ° C




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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

b q 2 4 7 0 2 b q 2 4 7 0 3


– 4 0 ° C ≤ T J ≤ 1 2 5 ° C , 7 V D C ≤ V C C ≤ 2 8 V D C , a l l v o l t a g e s r e l a t i v e t o V S S ( u n l e s s o t h e r w i s e s p e c i f i 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 D D ( O P ) T o t a l c h i p o p e r a t i n g c u r r e n t A C P R E S = H i g h , E N = 0 1 1 . 6 6 m A

I D D ( S L E E P ) T o t a l b a t t e r y s l e e p c u r r e n t , a c n o t p r e s e n t A C P R E S = L o w 2 2 2 8 μ A L O G I C I N T E R F A C E D C C H A R A C T E R I S T I C S

V O L L o w - l e v e l o u t p u t v o l t a g e ( A C P R E S , A L A R M ) I O L = 1 m A 0 . 4 V

V I L L o w - l e v e l i n p u t v o l t a g e ( A C S E L , E N A B L E ) 0 . 6 V

V I H H i g h - l e v e l i n p u t v o l t a g e ( A C S E L , E N A B L E ) 1 . 8 V

I ( S I N K 1 ) S i n k c u r r e n t ( A C P R E S ) V O L = 0 . 4 1 . 5 2 2 . 5 m A

I ( S I N K 2 ) S i n k c u r r e n t ( A L A R M ) V O L = 0 . 4 1 . 5 2 2 . 5 m A

P W M O S C I L L A T O R

0 ° C ≤ T J ≤ 8 5 ° C 2 8 0 3 0 0 3 4 0 f O S C ( P W M ) O s c i l l a t o r f r e q u e n c y k H z

– 4 0 ° C ≤ T J ≤ 1 2 5 ° C 2 4 0 3 0 0 3 5 0

M a x i m u m d u t y c y c l e 1 0 0 %

I n p u t v o l t a g e f o r m a x i m u m d c ( C O M P ) 3 . 8 V

M i n i m u m d u t y c y c l e 0 %

I n p u t v o l t a g e f o r m i n i m u m d c ( C O M P ) 0 . 8 V

V ( R A M P ) O s c i l l a t o r r a m p v o l t a g e ( p e a k - t o - p e a k ) 1 . 8 5 2 . 1 5 2 . 3 0

I n t e r n a l i n p u t c l a m p v o l t a g e V I K ( C O M P ) 3 . 8 4 . 5 ( t r a c k s C O M P v o l t a g e f o r m a x i m u m d c )

I S ( C O M P ) I n t e r n a l s o u r c e c u r r e n t ( C O M P ) E r r o r a m p l i f i e r = O F F , V ( C O M P ) = 1 V 7 0 1 1 0 1 4 0 μ A

L E A K A G E C U R R E N T

I L ( A C D E T ) L e a k a g e c u r r e n t , A C D E T V ( A C D E T ) = 5 V 0 . 2 μ A

I L ( S R S E T ) L e a k a g e c u r r e n t , S R S E T V ( S R S E T ) = 2 . 5 V 0 . 2 μ A

I L ( A C S E T ) L e a k a g e c u r r e n t , A C S E T V ( A C S E T ) = 2 . 5 V 0 . 2 μ A

I L ( B A T D E P ) L e a k a g e c u r r e n t , B A T D E P V ( B A T D E P ) = 5 V 0 . 2 μ A

I L ( V S ) L e a k a g e c u r r e n t , V S V ( V S ) = 5 V 0 . 2 μ A

I L ( A L A R M ) L e a k a g e c u r r e n t , A L A R M V ( A L A R M ) = 5 V 0 . 2 μ A

I L ( A C S E L ) L e a k a g e c u r r e n t , A C S E L V ( A C S E L ) = 5 V 0 . 2 μ A

I L ( E N A B L E ) L e a k a g e c u r r e n t , E N A B L E V ( E N A B L E ) = 5 V 0 . 2 μ A

I L ( A C P R E S ) L e a k a g e c u r r e n t , A C P R E S V ( A C P R E S ) = 5 V 0 . 2 μ A

I L ( B A T P ) L e a k a g e c u r r e n t , B A T P V ( B A T P ) = 5 V 0 . 2 μ A

I L ( B A T S E T ) L e a k a g e c u r r e n t , B A T S E T V ( B A T S E T ) = 2 . 5 V 0 . 2 μ A




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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 )

( 3 ) IBAT

SRSET

RSENSE

1

AV

m e a s u r e d g a i n , A V . c

SRSETA

V, Total accuracy in %

(m c)

c 100, I(SRP) I(SRN) 0




B A T T E R Y C U R R E N T - S E N S E A M P L I F I E R

g m T r a n s c o n d u c t a n c e g a i n 7 5 1 2 0 1 7 5 m A / V

C M R R C o m m o n - m o d e r e j e c t i o n r a t i o S e e ( 1 )

9 0 d B C o m m o n - m o d e i n p u t ( S R P , S R N ) v o l t a g e

V I C R V C C = S R N , S R P + 2 V 5 3 0 V r a n g e

I ( S I N K ) S i n k c u r r e n t ( C O M P ) C O M P = 1 V , ( S R P – S R N ) = 1 0 m V 0 . 5 1 . 5 2 . 5 m A

V ( S R P ) = 1 6 V , ( S R P – S R N ) = 1 0 0 m V , I n p u t b i a s c u r r e n t ( S R P ) ( 2 ) 7 0 8 5 1 1 0 S R S E T = 2 . 5 V , V C C = 2 8

I I B μ A ( S R P - S R N ) = 1 0 0 m V , S R S E T = 2 . 5 V ,

I n p u t b i a s c u r r e n t a c c u r a c y ( I S R P – I S R N ) – 3 0 3 V C C = 2 8 V , 0 ≤ T J ≤ 1 2 5 ° C

V ( S E T ) B a t t e r y c u r r e n t p r o g r a m m i n g v o l t a g e ( S R S E T ) 0 2 . 5 V

0 . 6 5 V ≤ S R S E T ≤ 2 . 5 V , A V B a t t e r y c u r r e n t s e t g a i n 2 4 2 5 2 6 V / V 8 V ≤ S R N ≤ 1 6 V ( 3 )

S R S E T = 1 . 2 5 V , T J = 2 5 ° C ( 4 ) – 5 % 5 %

T o t a l b a t t e r y c u r r e n t - s e n s e m i d - s c a l e a c c u r a c y S R S E T = 1 . 2 5 V ( 4 ) – 6 % 6 %

S R S E T = 2 . 5 V , T J = 2 5 ° C ( 4 ) – 3 % 3 % T o t a l b a t t e r y c u r r e n t - s e n s e f u l l - s c a l e a c c u r a c y S R S E T = 2 . 5 V ( 4 ) – 4 % 4 %

( 1 ) S p e c i f i e d b y d e s i g n . N o t p r o d u c t i o n t e s t e d . ( 2 ) I ( S R P ) = I ( S R N ) = ( V ( S R S E T ) / 5 0 k Ω ) + ( ( V ( S R P ) - V ( S R N ) / 3 k Ω )

e x a m p l e : I f ( V ( S R S E T ) = 2 . 5 V ) , ( V ( S R P ) - V ( S R N ) = 1 0 0 m V ) T h e n I ( S R P ) = I ( S R N ) = 8 3 A

( 4 ) T o t a l b a t t e r y - c u r r e n t s e t i s b a s e d o n t h e m e a s u r e d v a l u e o f ( S R P – S R N ) = Δ m , a n d t h e c a l c u l a t e d v a l u e o f ( S R P – S R N ) = Δ C , u s i n g t h e




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( 1 ) C a l c u l a t i o n o f t h e a c c u r r e n t : IAC

ACSET

RSENSE

1

AV

c ACSET

AV

, Total accuracy in % (m c)

c 100,I(ACP) I(ACN) 0

b q 2 4 7 0 2 b q 2 4 7 0 3


– 4 0 ° C ≤ T J ≤ 1 2 5 ° C , 7 V D C ≤ V C C ≤ 2 8 V D C , a l l v o l t a g e s r e l a t i v e t o V S S , ( u n l e s s o t h e r w i s e s p e c i f i e d )


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


C M R R C o m m o n - m o d e r e j e c t i o n r a t i o S e e ( 1 )

9 0 d B V I C R C o m m o n - m o d e i n p u t v o l t a g e r a n g e ( A C P ) 7 V C C V

I ( S I N K ) S i n k c u r r e n t ( C O M P ) C O M P = 1 V , ( A C P – A C N ) = 1 0 m V 0 . 5 1 . 5 2 . 5 m A

A C P = A C N = 2 8 V , V C C = 2 8 V , A C S E T = 2 . 5 I n p u t b i a s c u r r e n t ( A C P , A C N ) 4 0 5 0 6 5

V I I B A

I n p u t b i a s c u r r e n t a c c u r a c y r a t i o A C P = A C N = 2 8 V , V C C = 2 8 V , – 3 0 3

( I ( A C P ) , I ( A C N ) ) A C S E T = 2 . 5 V , 0 ≤ T J ≤ 1 2 5 ° C

V ( S E T ) A C c u r r e n t p r o g r a m m i n g v o l t a g e ( A C S E T ) 0 2 . 5 V

A V A C c u r r e n t s e t g a i n 0 . 6 5 V ≤ A C S E T ≤ 2 . 5 V , 1 2 V ≤ A C P ≤ 2 0 V ( 1 ) 2 4 . 5 2 5 . 3 2 6 . 5 V / V

A C S E T = 1 . 2 5 V , T J = 2 5 ° C ( 2 ) – 5 % 5 %

T o t a l a c c u r r e n t - s e n s e m i d - s c a l e a c c u r a c y A C S E T = 1 . 2 5 V ( 2 ) – 6 % 6 %

T o t a l a c c u r r e n t - s e n s e f u l l - s c a l e a c c u r a c y A C S E T = 2 . 5 V , T J = 2 5 ° C ( 2 ) – 3 . 5 % 3 . 5 %

A C S E T = 2 . 5 V ( 2 ) – 4 % 4 %

B A T T E R Y V O L T A G E E R R O R A M P L I F I E R


C M R R C o m m o n - m o d e r e j e c t i o n r a t i o S e e ( 1 ) 9 0 d B

B A T S E T c o m m o n - m o d e i n p u t v o l t a g e V I C R 1 2 . 5 V r a n g e

I n t e r n a l r e f e r e n c e o v e r r i d e i n p u t t h r e s h o l d V I T 0 . 2 0 0 . 2 5 0 . 3 5 V v o l t a g e

C O M P = 1 V , ( B A T P – B A T S E T ) = 1 0 m V , I ( S I N K ) S i n k c u r r e n t C O M P 0 . 5 1 . 5 2 . 5 m A B A T S E T = 1 . 2 5 V

T J = 2 5 ° C 1 . 1 9 0 1 . 1 9 6 1 . 2 0 2

V ( F B ) E r r o r - a m p l i f i e r p r e c i s i o n r e f e r e n c e v o l t a g e T J = 0 ° C t o 8 5 ° C 1 . 1 8 3 1 . 1 9 6 1 . 2 0 3 V

T J = – 4 0 ° C t o 1 2 5 ° C 1 . 1 7 8 1 . 1 9 6 1 . 2 0 4

( 2 ) T o t a l a c - c u r r e n t s e t a c c u r a c y i s b a s e d o n t h e m e a s u r e d v a l u e o f ( A C P - A C N ) = Δ c , u s i n g t h e m e a s u r e d g a i n , A V .




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( 1 ) B a t t e r y r e a d b a c k t r a n s f e r g a i n GTR

VIBAT

(SRP SRN)




B A T T E R Y C U R R E N T O U T P U T A M P L I F I E R

G ( T R ) T r a n s f e r g a i n ( S R P – S R N ) = 5 m V ( 1 ) 2 0 V / V

B a t t e r y c u r r e n t r e a d b a c k o u t p u t ( S R P – S R N ) = 5 m V , S R P = 1 2 V , V I ( B A T ) 1 0 0 m V v o l t a g e ( I B A T ) V C C = 1 8 V , T J = 2 5 ° C

L i n e r e j e c t i o n v o l t a g e T J = 2 5 ° C 1 0 m V / V

C M C o m m o n - m o d e i n p u t r a n g e ( S R P ) 5 2 8 V

V O ( I B A B a t t e r y c u r r e n t o u t p u t v o l t a g e 0 2 . 5 V T ) r a n g e ( I B A T )

I S ( O ) O u t p u t s o u r c e c u r r e n t ( I B A T ) ( S R P – S R N ) = 1 0 0 m V 5 7 . 1 9 . 4 m A

( S R P – S R N ) = 5 0 m V , T J = 2 5 ° C ( 1 ) – 3 % 2 . 4 %

( S R P – S R N ) = 5 0 m V , – 2 0 % 2 0 %

0 ° C ≤ T J ≤ 8 5 ° C T o t a l b a t t e r y c u r r e n t r e a d b a c k

( S R P – S R N ) = 1 0 0 m V , f u l l - s c a l e a c c u r a c y – 1 . 5 % 1 . 2 % T J = 2 5 ° C

( 1 )

( S R P – S R N ) = 1 0 0 m V , – 6 % 8 . 5 %

0 ° C < T J

< 8 5 ° C

5 - V V O L T A G E R E F E R E N C E

V r e f O u t p u t v o l t a g e ( V R E F ) T J = 2 5 ° C 4 . 9 8 5 5 5 . 0 1 3 V

T J = 0 ° C t o 8 5 ° C 4 . 9 4 6 5 5 . 0 1 3

T J = 4 0 ° C t o 8 5 ° C 4 . 9 4 6 5 5 . 0 3 V

T J = – 4 0 ° C t o 1 2 5 ° C 4 . 9 2 6 5 5 . 0 3 V

L i n e r e g u l a t i o n I L O A D = 5 m A 0 . 1 0 . 3 7 m V / V

L o a d r e g u l a t i o n 1 m A ≤ I L O A D ≤ 5 m A 1 . 1 4 m V / m A

S h o r t c i r c u i t c u r r e n t 8 2 0 3 0 m A

5 V R E F o u t p u t c a p a c i t o r C a p a c i t a n c e 2 . 2 1 0 μ F

O u t p u t c a p a c i t o r e q u i v a l e n t E S R 5 1 0 0 0 m Ω

r e s i s t o r

H A L F S U P P L Y R E G U L A T O R I ( S I N K ) = 2 0 m A , V C C = 1 8 V V C C – 1 1 V C C – 1 0 . 2 V C C – 8 . 5

V ( H S P ) V o l t a g e r e g u l a t i o n V I ( S I N K ) = 1 m A , V C C = 7 V 1 . 5




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VIBATc (SRP SRN)GTR Total Accuracy in %

VIBATm

VIBATc

VIBATm 100

b q 2 4 7 0 2 b q 2 4 7 0 3




M O S F E T G A T E D R I V E

A C d r i v e r R D S ( o n ) h i g h V C C = 1 8 V , I ( A C D R V ) = 1 m A 8 5 1 5 0 Ω

A C d r i v e r R D S ( o n ) l o w V C C = 1 8 V , I ( A C D R V ) = 1 m A 5 5 1 1 0 Ω B a t t e r y d r i v e r R D S ( o n ) h i g h V C C = 1 8 V , I ( B A T D R V ) = 1 m A 3 1 5 6 0 0 Ω

B a t t e r y d r i v e r R D S ( o n ) l o w V C C = 1 8 V , I ( B A T D R V ) = 1 m A 7 0 1 1 5 Ω

T i m e d e l a y f r o m a c d r i v e r o f f t o t d a A C S E L 2 . 4 V ̂ 0 . 2 V 1 . 2 2 μ s b a t t e r y d r i v e r o n

T i m e d e l a y f r o m b a t t e r y d r i v e r o f f t o t d b A C S E L 0 . 2 V $ 2 . 4 V 2 . 4 3 . 3 μ s a c d r i v e r o n

I O = – 1 0 m A , V C C = 1 8 V V C C – 0 . 1 8 V C C – 0 . 0 9 P W M d r i v e r h i g h - l e v e l o u t p u t V O H V v o l t a g e I O = – 5 0 m A , V C C = 1 8 V V C C – 1 . 2 V C C – 0 . 8

P W M d r i v e r R D S ( o n ) h i g h 7 1 4 Ω

I O = 1 0 m A , V C C = 1 8 V V H S P + 0 . 1 V H S P + 0 . 4 V O L P W M d r i v e r l o w - l e v e l o u t p u t v o l t a g e V

I O = 5 0 m A , V C C = 1 8 V V H S P + 0 . 6 V H S P + 1 . 2

P W M d r i v e r R D S ( o n )

l o w 5 8 . 5 Ω

S E L E C T O R

1 . 1 9 4 1 . 2 4 6 1 . 2 8 6 V ( A C P R E S ) A C p r e s e n c e d e t e c t v o l t a g e V

– 4 0 ° C t o 8 5 ° C 1 . 2 0 8 1 . 2 4 6 1 . 2 8 5

V I T ( A C P R E S ) A C p r e s e n c e h y s t e r e s i s 1 %

t d ( A C P R E S ) D e g l i t c h d e l a y f o r a d a p t e r i n s e r t i o n 1 0 0 μ s

S e e ( 1 ) 1 . 1 9 4 1 . 2 4 6 1 . 2 8 6 B a t t e r y d e p l e t i o n A L A R M t r i p V ( B A T D E P ) V v o l t a g e – 4 0 ° C t o 8 5 ° C 1 . 2 0 8 1 . 2 4 6 1 . 2 8 5

V ( N O B A T ) N o b a t t e r y d e t e c t , s w i t c h t o A C D R V b q 2 4 7 0 2 o n l y ( 1 ) 0 . 8 6 9 1 1 . 1 4 4 V

– 4 0 ° C t o 8 5 ° C 0 . 8 8 0 1 1 . 1 1 8

B a t t e r y s e l e c t t i m e ( A C S E L l o w t o V S < B A T P , 5 0 % t h r e s h o l d , A C S E L t ( B A T S E L ) 1 2 . 5 3 . 5 μ s B A T D R V l o w ) 2 . 4 V ↓ 0 . 2 V

A C s e l e c t t i m e ( A C S E L h i g h t o t ( A C S E L ) A C S E L 0 . 2 V ↑ 2 . 4 V 1 2 . 5 5 μ s A C D R V l o w )

V ( V S ) V S v o l t a g e t o e n a b l e B A T D R V B A T P = 1 V 0 . 9 8 1 1 . 0 2 V

V I T ( V S ) V S v o l t a g e h y s t e r e s i s V S > B A T P 2 0 3 5 8 5 m V

Z E R O V O L T O P E R A T I O N ( 2 )

S t a t i c d r a i n s o u r c e o n - s t a t e r D S ( o n ) V C C = 7 V , T J = 1 2 5 ° C , I O = 1 0 0 m A 5 . 3 8 . 7 Ω r e s i s t a n c e

B A T D E P i n c r e a s i n g 0 . 7 4 3 0 . 7 9 4 0 . 8 4 0 Z e r o v o l t o p e r a t i o n t h r e s h o l d V

B A T D E P d e c r e a s i n g 0 . 5 7 0 0 . 6 2 0 . 6 5 6

( 1 ) T o t a l b a t t e r y c u r r e n t r e a d b a c k a c c u r a c y i s b a s e d o n t h e m e a s u r e d v a l u e o f V I B A T , V I B A T m , a n d t h e c a l c u l a t e d v a l u e o f V I B A T , V I B A T c , u s i n g t h e m e a s u r e d v a l u e o f t h e t r a n s f e r g a i n , G T R .

( 2 ) S e e T a b l e 1 t o d e t e r m i n e t h e l o g i c o p e r a t i o n o f t h e b q 2 4 7 0 2 a n d t h e b q 2 4 7 0 3 .




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R 6

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a r g e C u r r e n t

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R 2 8 S e t s S y

s t e m B r e a k B e f o r e M a k e

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b q 2 4 7 0 3

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p e n d s o n R 2 1 a n d R 1 9 , S e e A p p l i c a t i o n N o t e s

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A P P L I C A T I O N D I A G R A M

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 3 – 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


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UDG-00137

20

VHSP

VHSP

REGULATOR

22

VCC

7

VREF

VOLTAGE

REFERENCE

VREF

ACPRES

2ACPRES

+1ACDET

ACPRES

HYST

LEVEL

SHIFT

S Q

QR

PWM

LOGICOSC21

HIGH-SIDE

DRIVE

300 kHz

+

3ACSEL

8ENABLE

VCC

VHSP

10COMP

5 V

100 µA

+

+

5 V

SRN

+2 k Ω

12ACP

11ACN

+6ACSET

25

kΩ

VCC

ac

CURRENT

ERROR

AMPLIFIER

BATTERY

CURRENT

ERROR

AMPLIFIER

BATTERY

VOLTAGE

ERROR

AMPLIFIER

+

13

PWM

BATP

9 BATSET

16 SRP2 k Ω

15 SRN

5 SRSET

25

kΩ

0.25 V

BATTERY

SELECT

DRIVE

ADAPTER

SELECT

DRIVE

+

24

VCC

VHSP

VCC

23 BATDRV

BATTERY SELECT

LOGIC

AND

ANTI-CROSS

CONDUCT

+

NO BATTERY

COMPARATOR

17 GND

+A=20

VCC

14 IBATSRP

SRN

ACSEL

ACPRES

+

SWITCH TO

BATTERY

4BATDEP

+

DEPLETED

BATTERY

COMPARATOR

BATP

18VS

2

2

1

1

ACDRV

ACDRV

ACSELbq24702 ONLY

bq24703 ONLY

19ALARM

2 V

+BATDA

VTBD Zero VoltCharging

VACPRES

VFB

0.8 x VNOBAT

VBATDEP

b q 2 4 7 0 2 b q 2 4 7 0 3


B L O C K D I A G R A M

C o p y r i g h t © 2 0 0 3 – 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


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P I N A S S I G N M E N T S


T a b l e 1 . T E R M I N A L F U N C T I O N S

T E R M I N A L

I / O D E S C R I P T I O N b q 2 4 7 0 2 b q 2 4 7 0 3 N A M E

( P W ) ( Q F N )

A C D E T 1 2 6 I A C o r a d a p t e r p o w e r d e t e c t i o n

A C D R V 2 4 2 5 O A C o r a d a p t e r p o w e r s o u r c e s e l e c t i o n o u t p u t

A C N 1 1 8 I N e g a t i v e d i f f e r e n t i a l i n p u t

A C P 1 2 9 I P o s i t i v e d i f f e r e n t i a l i n p u t

A C P R E S 2 2 7 O A C p o w e r i n d i c a t o r

A C S E L 3 2 8 I A C a d a p t e r p o w e r s e l e c t

A C S E T 6 3 I A d a p t e r c u r r e n t p r o g r a m m i n g v o l t a g e

A L A R M 1 9 1 9 O A l a r m o u t p u t

B A T D E P 4 1 I D e p l e t e d b a t t e r y l e v e l

B A T D R V 2 3 2 4 O B a t t e r y p o w e r s o u r c e s e l e c t o u t p u t

B A T P 1 3 1 2 I B a t t e r y c h a r g e r e g u l a t i o n v o l t a g e m e a s u r e m e n t i n p u t t o t h e b a t t e r y - v o l t a g e g m a m p l i f i e r

B A T S E T 9 6 I E x t e r n a l o v e r r i d e t o a n i n t e r n a l p r e c i s i o n r e f e r e n c e

C O M P 1 0 7 O I n v e r t i n g i n p u t t o t h e P W M c o m p a r a t o r

E N A B L E 8 5 I C h a r g e e n a b l e G N D 1 7 1 7 O S u p p l y r e t u r n a n d g r o u n d r e f e r e n c e

I B A T 1 4 1 3 O B a t t e r y c u r r e n t d i f f e r e n t i a l a m p l i f i e r o u t p u t

P W M 2 1 2 1 O G a t e d r i v e o u t p u t

S R N 1 5 1 5 I N e g a t i v e d i f f e r e n t i a l b a t t e r y c u r r e n t s e n s e a m p l i f i e r i n p u t

S R P 1 6 1 6 I / O P o s i t i v e d i f f e r e n t i a l b a t t e r y c u r r e n t s e n s e a m p l i f i e r i n p u t

S R S E T 5 2 I B a t t e r y c h a r g e c u r r e n t p r o g r a m m i n g v o l t a g e

V C C 2 2 2 2 I O p e r a t i o n a l s u p p l y v o l t a g e

V H S P 2 0 2 0 O V o l t a g e s o u r c e t o d r i v e g a t e s o f t h e e x t e r n a l M O S F E T s

V R E F 7 4 O P r e c i s i o n 5 - V r e f e r e n c e

V S 1 8 1 8 I S y s t e m ( l o a d ) v o l t a g e i n p u t p i n

A C D E T : A C o r a d a p t e r p o w e r d e t e c t i o n . T h i s i n p u t p i n i s u s e d t o d e t e r m i n e t h e p r e s e n c e o f t h e a c a d a p t e r . W h e n t h e v o l t a g e l e v e l o n t h e A C D E T p i n i s l e s s t h a n V A C P R E S , t h e b q 2 4 7 0 2 / b q 2 4 7 0 3 i s i n s l e e p m o d e , t h e P W M c o n t r o l i s d i s a b l e d , t h e B A T D R V i s d r i v e n l o w , a n d t h e A C D R V i s d r i v e n h i g h . T h i s f e a t u r e c a n b e u s e d t o a u t o m a t i c a l l y s e l e c t b a t t e r y a s t h e s y s t e m p o w e r s o u r c e .

A C D R V : A C o r a d a p t e r p o w e r s o u r c e s e l e c t o u t p u t . T h i s p i n d r i v e s a n e x t e r n a l P - c h a n n e l M O S F E T u s e d t o s w i t c h t o t h e a c w a l l - a d a p t e r a s t h e s y s t e m p o w e r s o u r c e . W h e n t h e A C S E L p i n i s h i g h w h i l e t h e v o l t a g e o n t h e

A C D E T p i n i s g r e a t e r t h a n V A C P R E S , t h e o u t p u t A C D R V p i n i s d r i v e n l o w ( V H S P ) . T h i s p i n i s d r i v e n h i g h ( V C C ) w h e n t h e A C D E T i s l e s s t h a n V A C P R E S .

A C N , A C P : N e g a t i v e a n d p o s i t i v e d i f f e r e n t i a l i n p u t s , r e s p e c t i v e l y f o r a c - t o - d c 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 .

A C P R E S : T h i s o p e n - d r a i n o u t p u t p i n i s u s e d t o i n d i c a t e t h e p r e s e n c e o f a c p o w e r . A l o g i c h i g h i n d i c a t e s t h e r e i s a v a l i d a c i n p u t . A l o w i n d i c a t e s t h e l o s s o f a c p o w e r . A C P R E S i s h i g h w h e n t h e v o l t a g e l e v e l o n t h e A C D E T p i n i s g r e a t e r t h a n V A C P R E S .

A C S E L : A C a d a p t e r p o w e r s e l e c t . T h i s i n p u t s e l e c t s e i t h e r t h e a c a d a p t e r o r t h e b a t t e r y a s t h e p o w e r s o u r c e . A l o g i c h i g h s e l e c t s a c p o w e r , w h i l e a l o g i c l o w s e l e c t s t h e b a t t e r y .

A C S E T : A d a p t e r c u r r e n t p r o g r a m m i n g v o l t a g e . T h i s i n p u t s e t s t h e s y s t e m c u r r e n t l e v e l a t w h i c h d y n a m i c p o w e r m a n a g e m e n t o c c u r s . A d a p t e r c u r r e n t s a b o v e t h i s p r o g r a m m e d l e v e l a c t i v a t e t h e d y n a m i c p o w e r m a n a g e m e n t a n d p r o p o r t i o n a l l y r e d u c e t h e a v a i l a b l e p o w e r t o t h e b a t t e r y .

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 3 – 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



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b q 2 4 7 0 2 b q 2 4 7 0 3


A L A R M : D e p l e t e d b a t t e r y a l a r m o u t p u t . T h i s o p e n - d r a i n p i n i n d i c a t e s t h a t a d e p l e t e d b a t t e r y c o n d i t i o n e x i s t s . A p u l l u p o n A L A R M g o e s h i g h w h e n t h e v o l t a g e o n t h e B A T D E P p i n i s b e l o w V A C P R E S . O n t h e b q 2 4 7 0 2 , t h e

A L A R M o u t p u t a l s o a c t i v a t e s w h e n t h e s e l e c t o r i n p u t s d o n o t m a t c h t h e s e l e c t o r s t a t e .

B A T D E P : D e p l e t e d b a t t e r y l e v e l . A v o l t a g e d i v i d e r n e t w o r k f r o m t h e b a t t e r y t o B A T D E P p i n i s u s e d t o s e t t h e b a t t e r y v o l t a g e l e v e l a t w h i c h d e p l e t i o n i s i n d i c a t e d b y t h e A L A R M p i n . S e e A L A R M p i n f o r m o r e d e t a i l s . A b a t t e r y d e p l e t i o n i s d e t e c t e d w h e n B A T D E P i s l e s s t h a n V A C P R E S . A n o - b a t t e r y c o n d i t i o n i s d e t e c t e d w h e n t h e

b a t t e r y v o l t a g e i s < 8 0 % o f t h e d e p l e t e d t h r e s h o l d . I n a n o - b a t t e r y c o n d i t i o n , t h e b q 2 4 7 0 2 a u t o m a t i c a l l y s e l e c t s a c a s t h e i n p u t s o u r c e . I f E N A B L E = 1 , t h e P W M r e m a i n s e n a b l e d .

B A T D R V : B a t t e r y p o w e r s o u r c e s e l e c t o u t p u t . T h i s p i n d r i v e s a n e x t e r n a l P - c h a n n e l M O S F E T u s e d t o s w i t c h t h e b a t t e r y a s t h e s y s t e m ' s p o w e r s o u r c e . W h e n t h e v o l t a g e l e v e l o n t h e A C D E T p i n i s l e s s t h a n V A C P R E S , t h e o u t p u t o f t h e B A T D R V p i n i s d r i v e n l o w , G N D . T h i s p i n i s d r i v e n h i g h ( V C C ) w h e n A C S E L i s h i g h a n d A C D E T > V A C P R E S .

B A T P : B a t t e r y c h a r g e r e g u l a t i o n v o l t a g e m e a s u r e m e n t i n p u t t o t h e b a t t e r y - v o l t a g e g m a m p l i f i e r . T h e v o l t a g e o n t h i s p i n i s t y p i c a l l y d e r i v e d f r o m a v o l t a g e d i v i d e r n e t w o r k c o n n e c t e d a c r o s s t h e b a t t e r y . I n a v o l t a g e l o o p , B A T P i s r e g u l a t e d t o t h e V F B p r e c i s i o n r e f e r e n c e o f t h e b a t t e r y v o l t a g e g m a m p l i f i e r .

B A T S E T : A n e x t e r n a l o v e r r i d e t o a n i n t e r n a l p r e c i s i o n r e f e r e n c e . W h e n B A T S E T i s > 0 . 2 5 V , t h e v o l t a g e l e v e l o n t h e B A T S E T p i n s e t s t h e v o l t a g e c h a r g e l e v e l . W h e n B A T S E T ≤ 0 . 2 5 V , a n i n t e r n a l V F B r e f e r e n c e i s c o n n e c t e d t o t h e i n v e r t i n g i n p u t o f t h e b a t t e r y e r r o r a m p l i f i e r . T o e n s u r e p r o p e r b a t t e r y v o l t a g e r e g u l a t i o n w i t h B A T S E T , B A T S E T m u s t b e > 1 . 0 V . S i m p l y g r o u n d B A T S E T t o u s e t h e i n t e r n a l r e f e r e n c e .

C O M P : T h e i n v e r t i n g i n p u t t o t h e P W M c o m p a r a t o r a n d o u t p u t o f t h e g m a m p l i f i e r s . A t y p e I I c o m p e n s a t i o n n e t w o r k b e t w e e n C O M P a n d G N D i s r e c o m m e n d e d .

E N A B L E : C h a r g e e n a b l e . A h i g h o n t h i s i n p u t p i n a l l o w s P W M c o n t r o l o p e r a t i o n t o e n a b l e c h a r g i n g w h i l e a l o w o n t h i s p i n d i s a b l e s a n d f o r c e s t h e P W M o u t p u t t o a h i g h s t a t e . B a t t e r y c h a r g i n g i s i n i t i a t e d b y a s s e r t i n g a l o g i c 1 o n t h e E N A B L E p i n .

G N D : S u p p l y r e t u r n a n d g r o u n d r e f e r e n c e

I B A T : B a t t e r y c u r r e n t d i f f e r e n t i a l a m p l i f i e r o u t p u t . T h e o u t p u t o f t h i s p i n p r o d u c e s a v o l t a g e p r o p o r t i o n a l t o t h e b a t t e r y c h a r g e c u r r e n t . T h i s v o l t a g e i s s u i t a b l e f o r d r i v i n g a n A D C i n p u t .

P W M : G a t e d r i v e o u t p u t p i n d r i v e s t h e P - c h a n n e l M O S F E T f o r P W M c o n t r o l . T h e P W M c o n t r o l i s a c t i v e w h e n A C P R E S , A C S E L , a n d E N A B L E a r e h i g h . P W M i s d r i v e n l o w t o V H S P a n d h i g h t o V C C .

S R N , S R P : D i f f e r e n t i a l a m p l i f i e r i n p u t s f o r b a t t e r y c u r r e n t s e n s e . T h e s e p i n s f e e d b a c k t h e b a t t e r y c h a r g e c u r r e n t

f o r P W M c o n t r o l . S R N i s t i e d t o t h e b a t t e r y t e r m i n a l . S R P i s t h e s o u r c e p i n f o r z e r o v o l t o p e r a t i o n .

S R S E T : B a t t e r y c h a r g e c u r r e n t p r o g r a m m e d v o l t a g e . T h e l e v e l o n t h i s p i n s e t s t h e b a t t e r y c h a r g e c u r r e n t l i m i t .

V C C : O p e r a t i o n a l s u p p l y v o l t a g e .

V H S P : T h e V H S P p i n i s c o n n e c t e d t o a 1 - μ F c a p a c i t o r ( c l o s e t o t h e p i n ) t o p r o v i d e a s t a b l e v o l t a g e s o u r c e t o d r i v e t h e g a t e s o f t h e e x t e r n a l M O S F E T s . V H S P = V C C – 1 0 V f o r V

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