Low-Cost Multichemistry Battery Chargers

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13

DCIN

LDO

MAX1908

MAX8724

CLS

REF

GND

CELLS

DLOV

AC ADAPTER INPUT

8.5V TO 28V

12.6V OUTPUT VOLTAGE

7.5A INPUT

CURRENT LIMIT

DHI

D3

BST

SMART

BATTERY

HOST

ACIN

D2

R6

59k

Ω

1%

R7

19.6k

Ω

1%

C5

1

µF

VCTL

ICTL

REFIN

ACOK

ICHG

IINP

R8

1M

Ω

R9

20k

Ω

R10

10k

Ω

C14

0.1

µF

C20

0.1

µF

CCV

C11

0.1

µF

R5

1k

Ω

CCI

CCS

C10

0.01

µF

C9

0.01

µF

C12

1

µF

C1

2

× 10µF

C13

1

µF

C15

0.1

µF

LX

C16

1

µF

LDO

R13

33

Ω

CSSP

CSSN

(FLOAT-THREE CELLS SELECT)

D1

RS1

0.01

Ω

L1

10

µH

RS2

0.015

Ω

CSIP

CSIN

PGND

DLO

N1b

N1a

BATT

C4

22

µF

BATT+

R19, R20, R21

10k

Ω

AVDD/REF

SCL

SDA

TEMP

BATT-

A/D INPUT

A/D INPUT

OUTPUT

D/A OUTPUT

SCL

SDA

A/D INPUT

GND

PGND

GND

TO EXTERNAL

LOAD

SHDN

0.1

µF

0.1

µF

Figure 1. µC-Controlled Typical Application Circuit

Typical Application Circuits