MITSUMI
Protection of Lithium Ion Battery (three cells in series) MM1309
Pin Assignment
1
2
8
7
6
5
3
4
5
1
2
3
4
6
7
SOP-8C
8
D
CHG
N. C
OV
GND
B
ATL
B
ATM
B
ATM
V
CC
Pin Description
No.
1
2
3
4
Pin
D
CHG
N. C
OV
GND
B
ATL
B
ATM
B
ATM
V
CC
Input
Input
Input
Output 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.
Output
Function
Output FET drive pin for excess discharge control
5
6
7
8
Timing Chart
Overcharge
Excess discharge
B
ATH
V
CELL
U
V
CELL
O
V
CELL
D
V
CELL
S
V
CELL
U
V
CELL
O
V
CELL
D
V
CELL
S
V
CELL
U
V
CELL
O
V
CELL
D
V
CELL
S
H
L
Normal
Unbalanced (large voltage differences)
Normal
Overcharge
Excess discharge
Excess discharge
Normal
Normal
Overcharge
B
ATM
B
ATL
V
ALM
V
ALM
V
ALM
D
CHG
OV
L
High Impedance
High Impedance
High Impedance
MITSUMI [ MITSUMI ELECTRONICS, CORP. ]
