MITSUMI

Protection of Lithium Ion Battery (three cells in series) MM1309

Pin Assignment

14

3

2

85

6

7

SOP-8C

Pin Description

1

2

N. C

3

OV

4

GND

5

6

7

8

No.

Pin

Output

Function

1

Output

2

N. C

3

OV

Output

4

GND

5

Input

6

Input

7

Input

8

FET drive pin for excess discharge control

FET drive pin for overcharge control

Negative connection pin for the low side battery. Also, IC GND pin.

(IC reference power supply pin)

Positive connection pin for the low side battery, and negative connection pin for the

middle side battery.

Positive connection pin for the middle side battery, and negative connection pin for

the high side battery.

Positive connection pin for the high side battery.

IC positive power supply input pin.

Timing Chart

High Impedance

High Impedance

High Impedance

OV

H

L

L

Excess discharge

Normal

Overcharge

Normal

Excess discharge

Overcharge

Normal

Overcharge

Excess discharge

Normal

Unbalanced (large voltage differences)