MITSMI MM1309CF, MM1309BF Datasheet
MITSUMI
Protection of Lithium Ion Battery (three cells in series) MM1309
Protection of Lithium Ion Batteries (three cells in series)
Monolithic IC MM1309
Outline
This is a 3-cell series protection IC is for protecting a lithium ion battery from overcharging and excess
discharging. If abnormalities occur during charging and excess voltage is applied, it has a function that turns
off the external FET switch (overcharging detection). It also has a function that turns off the external FET
switch when the voltage for each battery falls below a set voltage, to prevent excess discharge when
discharging the battery (discharging detection). At that time, the IC is switched to low current consumption
mode.
These functions comprise a protection circuit, with few external parts, for lithium ion batteries.
Features
1. Current consumption (for VCC pin) VCELL=4.4V 700µA typ.
2. Current consumption (for V
3. Current consumption (for V
4. Current consumption (for V
5. Current consumption (for BATH pin) V
6. Current consumption (for BATH pin) V
7. Current consumption (for BATH pin) V
8. Charge prohibit voltage (Ta=
9. Charge prohibit release voltage V
10.Charge prohibit detection function operation voltage B : 4.20V typ.
11.Excess discharge detection voltage 2.40V±0.09V, 2.35V±0.09V
12.Discharge resumption voltage B : 2.65V±0.16V
13.Excess discharge detection hysteresis voltage 250±75mV
CC pin) VCELL=4.2V 300µA typ.
CC pin) VCELL=3.8V 25µA typ.
CC pin) VCELL=2.2V 0.1µA max.
CELL=4.4V 12µA typ.
CELL=3.8V 8µA typ.
CELL=2.2V 1µA typ.
-
20°C~+70°C) B : 4.35V±50mV
C : 4.25V±50mV
CELLU
-
45mV
C : 4.10V typ.
C : 2.60V±0.16V
Package
SOP-8C (MM1309 F)
The box represents the rank resulting from the combination of protection functions.
*
Applications
1. Notebook PCs
2. Portable terminals
3. Others
MITSUMI
1432
8567
SOP-8C
High Impedance
High Impedance
High Impedance
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
O
V
CELL
D
V
CELL
S
B
ATM
B
ATH
B
ATL
V
ALM
V
ALM
V
ALM
D
CHG
OV
H
L
L
Excess discharge
Normal
Overcharge
Normal
Excess discharge
Overcharge
Normal
Overcharge
Excess discharge
Normal
Unbalanced (large voltage differences)
V
CELL
U
Pin Assignment
Protection of Lithium Ion Battery (three cells in series) MM1309
1 DCHG
2 N. C
3 OV
4 GND
Pin Description
No. Pin Output Function
1 D
2 N. C
3 OV Output
4 GND
5 B
6 B
7 B
8 V
CHG Output
ATL Input
ATM Input
ATM Input
CC
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.
5 B
ATL
6 BATM
7 BATM
8 VCC
Timing Chart
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