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MM1438

IC for Control of Lithium-ion Betteries Charging (one cell)

Mitsumi 

MITSUMI

Block Diagram

IC for Control of Lithium-ion Betteries Charging (one cell) MM1438

ICHG

R2

Control

*1 For example, if charging current (ICHQ) is set at 0.5A, R1 = 0.2 Ω can be set. (VCL/ICHQ=0.1V/0.5A=R1)

*2 Charging current can be controlled by varying resistance value with R1 and R2.

Pin Description

Pin No. Pin name I/O

1

GND Input

2

LV Output

3

SW2 Input

4

SW1 Input

5

VCC Input

6

EXT Output

7

CEL Input

8

CS Input

Pin Description

Ground pin

Low voltage detection circuit output pin

ON with NPN-Tr open collector output at low voltage

Low voltage detection circuit ON/OFF control input pin

SW2 = VCC: OFF, SW2 = GND: ON

ON/OFF control input pin for the IC

SW1 = VCC: OFF, SW1 = GND: ON

Power supply input pin

Charging control output pin Controls external PNP-Tr to control charging.

Battery voltage input pin

Detects battery voltage and controls rated voltage to the prescribed voltage value.

Current detection pin

Detects current by drop in external resistor voltage and controls rated current.

Current value can be set at 0.1V/R1 typ.

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