8-Channel PMICs for

Digital Camera Power Supplies

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21

Figure 2. MAX8611 (Li+ or Combination Li+/2 AA Input) Typical Application Circuit. The MAIN (M) and AFE outputs operate as step-

down converters and are powered from the step-up (SU) for efficient boost-buck operation.

MAX8611

LXINV

21

REF

R7

604k

Ω

R8

100k

Ω

25

FBINV

L5

10

GD

PVBST

SWBST

LXBST

FBBST

26

R9

1.3M

Ω

R10

100k

Ω

L6

4.3

μH

D2

LXAFE

PVAFE

8

9

7

PGAFE

FBAFE

R12

100k

Ω

R11

243k

Ω

L3

3

μH

REXT

R18

100k

Ω

39

PVLED

SWLED

LXLED

PG2

FBHLED

FBLLED

D3

C13

10

μF

L7

10

μH

R16

100k

Ω

R15

1.6M

Ω

DRVAUX

C22*

1

μF

C21*

1

μF

FBAUX

R13

1.1M

Ω

R14

100k

Ω

C14

1

μF

D4

L8

10

μH

CCAUX

R20

100k

Ω

C18

2.2nF

PVINV

20

C25

1

μF

REF

40

C15

0.22

μF

BATT

(3V TO 5V)

L1

1

LXSU

PVSU

SU

45

44

FBSU

R1

402k

Ω

R2

100k

Ω

R3

232k

Ω

R4

100k

Ω

R5

40.2k

Ω

R6

100k

Ω

PGSU

5V

LXM

PVM

L2

3

3.3V

FBM

PGM

PVSD

LXSD

L4

4.7

μH

FBSD

PGSD

C10

10

μF

1.4V

3.4V

14V

-7.4V

PG1

EP

GND

ONSU

ONM

ONSD

ONLED

ONBST

SEQCCD

ONAFE

ONAUX

46

3

15

36

22

27

10

14

1

12

6

17

16

13

2

4

5

48

42

43

47

41

18

24

23

19

37

38

32

33

34

35

11

31

30

29

28

D1

C2

22

μF

C1

22

μF

C4

22

μF

C3

22

μF

C5

OPEN

C6

22

μF

C9

10

μF

(2x)

ONINV

C11

10

μF

C19

OPEN

C12

10

μF

C20

OPEN

C7

22

μF

C8

OPEN

C24

1

μF

C23

1

μF

R17

10

Ω

WHITE

LEDs

* C21, C22 ARE OPTIONAL.

ABRIDGED