M62240FP
Single Chip Battery Charger Control IC
REJ03F0239-0200
Rev.2.00
Sep 14, 2007
Description
The M62240FP is a general purpose battery charger control IC. It can control all of the sequence needed for battery
charging, it also has functions such as detection of battery temperature, a protection against over-current/voltage, a
safety timer and so on. Moreover, it can adapt to charge Ni-Cd, Ni-MH batteries by adding few peripheral components.
The IC has the feedback control of the charge current and output voltage.
Features
•
Low voltage (3 V) operation
•
Built-in following functions and circuits;
CR oscillator for internal logic
Initialization timer and safety timer for
∆V
error detection and over-charging
D/A converter and shift registers to maintain the peak voltage of battery
Main output SW driving circuits
LED driving circuit for displaying the status of the charging
System reset circuit for detecting the power supply voltage
Temperature detection circuit for the Ni-MH battery
Voltage and current control circuits for feedback to the primary side of the SMPS.
Protective functions including detection of over-voltage in charge mode and over-current in adapter mode and so on
Application
Battery charger for video cameras and handheld telephones, etc.
Block Diagram
V
CC
17
SYSTEM
RESET CHT.
Vref1 Vref2
2
13
V
DET
16
I
DET
18
LED
3
LED
DRIVER
Chg SW
6
OUTPUT
SW DRIVER
STABLED
PWR. SUP.
P.C
15
+
−
+
−
CURRENT
SET-UP CKT.
OVER-CURRENT
DET. CKT.
BATTERY TEMP
DET. CKT.
8
VOLTAGE
SET-UP CKT.
Batt SW
CONTROL LOGIC
9
VTR SW
I
SET1
I
SET2
20
1
CLOCK
GEN. CKT.
14
Batt T
Batt
+
Batt
−
−∆V
ERROR DET.
PREV. LOGIC
BATT. VOLTAGE
DET. CKT.
11
OSCILLATOR
TEST
CKT.
12
7
4
5
10
19
GND
Rc
Cc
TEST OC SET
REJ03F0239-0200 Rev.2.00 Sep 14, 2007
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RENESAS [ RENESAS TECHNOLOGY CORP ]
