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MM1248

Control of Lithium Ion Battery Charging and Discharging

Mitsumi 

MITSUMI

Pin Description

Pin no.

1

Pin name

DCHG

Control of Lithium Ion Battery Charging and Discharging MM1248

Equivalent circuit

Function

Pch-FET gate connector pin for discharge control

"L" output during discharge, "H" when discharge is

stopped

2

CHG

3

VIN

4

CON

Pch-FET gate connector pin for charge control

Feedback loop for constant-voltage control formed

during charging; "H" output when charging is

stopped

When overvoltage or overheating is sensed (during

charging), the gate is turned off ("H" level).

Power supply input pin for the charge control unit

Input pin for charge control signal.

Input "L" to turn charging on, "H" to turn charging

off (when open, charging is off)

5

OV1

6

VBAT

Overvoltage signal output pin. PNP output, with

internal pull-down resistance (50 kΩ typ.)

"L" output in normal operation, "H" output on

overvoltage

On discharge, 1/3 the battery module voltage is

output; when discharge stops, switches to high-

impedance output

7

CCC

Pin for connection to a capacitor to set the dead

time for overcharge detection

Normal operation : GND level; overcharge : approx.

5V

Dead time is approx 1S for an 0.068µF capacitance

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