REJ03F0246-0200 Rev.2.00 Jun 16, 2008

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M62256FP

Single Chip Battery Charger Control IC

REJ03F0246-0200

Rev.2.00

Jun 16, 2008

Description

M62256FP is a semiconductor integrated circuit designed to control the battery charger. This IC controls not only all

the time sequence needed for battery charging, but also gives full support for detection of battery temperature,

protection over current and voltage, and safety timer, etc. It is also a simple matter to charge Ni-Cd, Ni-MH batteries by

adding a small peripheral components to this IC.

This IC has a feedback controlling of the charge current and the output voltage.

Features

• Designed for low voltage (3 V) operation.

• Built-in CR oscillator is used for internal logic.

• Built-in initialization timer and safety timer enable –∆V error detection and over-charging.

• Built-in D/A converter and shift-resister circuits to maintain the peak voltage of battery.

• Built-in main output SW and discharge drive circuits.

• Built-in LED drive circuits for displaying the status of the power supply and charging/discharging.

• Built-in system reset circuit for detecting the power supply voltage.

• Built-in temperature detection circuit for the Ni-MH battery.

• Built-in voltage and current control circuit which enables feedback to the primary side of the SMPS.

• Built-in protective functions including detection of over-voltage in charge mode and over-current in adapter mode,

and others.

Applications

General electronic battery charger for VCR and camera in one unit, mobile phone, etc.

Block Diagram

12

35

6

8

10

13

4

7

9

11

12

14

15

16

17

C1

E1

C2 C3

E3

Cc

Dchg OUT

Batt SW

E2

Rc

Dchg IN

Chg SW

GND2

(A.GND)

Dchg SW

Adpt SW

Test1 Test2

36

35

34

32

31

29

27

24

33

30

28

26

25

23

22

21

20

Vref1 Iset2 Iset1

PCS OUT

PCS IN

GND1

(P.GND)

P.C

OCSET

CP1

Vcc

CP2

Vref2

Batt

−

Batt +

+

−

+

−

System

Reset ckt.

to internal

circuit

to internal

circuit

Stabl'd

Pwr. Sup.

Detect un-

plugged PS cord

Voltage

set-up ckt.

Safety

timer

Over-current

det. ckt.

Battery temp

det. ckt.

Discharge

current control

Discharge

driver

Output SW

driver

LED driver

Control logic

Batt. voltage

det. ckt.

−∆V det.

logic

−∆V error det.

prev. logic

Oscillator

Clock

gen. ckt.

Test ckt.

Current

set-up ckt.

Voltage

control

OP-amp.

Current

control

OP-amp.