MITSUMI

Protection of Lithium Ion Batteries (one cell) MM1291

Pin Assignment

14

3

2

85

6

7

SOP-8C/SOP-8D

1

GND

2

GD

3

CS

4

OC

5

CE

6

TD

7

8

Pin Description

I/O

Description

1

GND

Input

Negative power supply for this IC. Also acts as detection pin for the battery

2

GD

Output

Nch-FET gate connection pin for discharge control. Switches gate OFF when

excess discharge is detected, and for current protection. Switches gate ON when

excess discharge is detected in normal state.

3

CS

Input

Detection pin for voltage between CS-GND. Detects excess discharge using Nch-

FET (discharge control) ON resistor and discharge current.

4

OC

Output

Control pin for Nch-FET for charge control. Switches FET off by activating an

external transistor when excess charging is detected.

5

N.C

6

TD

Input

This pin sets non-induction time for overcharge detection. It charges the capacitor

connected between TD-GND with a fixed current during overcharging.

7

Input

Positive power supply pin for the IC.

8

Input