Smallest, All-Internal MOSFET,

7-Channel 2 AA DSC PMIC

14

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LXSU

PVSU

SU

FBSU

PGSU

(EP)

PGSD

(EP)

PGM

(EP)

PVM

(5V, 500mA)

LXM

FBM

(3.3V, 300mA)

PVSD

LXSD

FBSD

ONSU

NOTE 1:

ALL ON_ PINS HAVE INTERNAL 1M

Ω

PULLDOWN TO GROUND.

NOTE 2:

ALL CONVERTERS’ POWER GROUND

CONNECTIONS ARE THROUGH THE

EXPOSED PADDLE (EP).

ONM

ONLED

ONBST

ONINV

LXINV

FBINV

SWBST

LXBST

FBBST

PVLED

SWLED

LXLED

OVLED

FBLED

PGBST

(EP)

PGLED

(EP)

EP

GND

REF

PVINV

(1.8V TO 5.5V)

(15V, 30mA)

(16V, 25mA)

(-7.5V, 100mA)

ONSD

PVBST

C20

0.1

µF

C18

1

µF

L2

1

µH

C1

22

µF

C2

22

µF

L1

2

µH

L6

2.2

µH

L7

10

µH

D1

D2

D3

C5

1

µF

24

32

30

26

27

39,

40

1, 2

3

35

7

34

28

4

33

12

21

8

25

9

11

10

14

13

18

22

20

17

23

15

16

29

LXSU

31

PVSU

37

LXZ

6

R16

100k

Ω

ONZ

38

PGZ

(EP)

FBZ

5

PVZ

36

D7

D6

D5

D4

MAX8857A

C3

22

µF

C4

22

µF

C21

0.1

µF

R17

100

Ω

R2

100k

Ω

R3

23.2k

Ω

R1

402k

Ω

C6

22

µF

C7

22

µF

C8

10

µF

C11

1

µF

C14

1

µF

C16

1

µF

R4

10k

Ω

(1.8V, 250mA)

L3

4.7

µH

R5

80.6k

Ω

C10

10

µF

C9

10

µF

R6

100k

Ω

(2.5V, 200mA)

L4

4.7

µH

L5

4.7

µH

R7

150k

Ω

C12

10

µF

C13

10

µF

C15

3.3

µF

R8

100k

Ω

R9

1.6M

Ω

R10

100k

Ω

C17

2.2

µF

C19

10

µF

R11

1.4M

Ω

R12

100k

Ω

R13

604k

Ω

R14

100k

Ω

SDOK

R15

10

Ω

PVGD

19

C23

1

µF, OPTIONAL

Figure 1. MAX8857A Typical Application Circuit

ABRIDGED