Protection of Lithium Ion Batteries (two cells in series) MM1292
MITSUMI
Protection of Lithium Ion Batteries (two cells in series)
Monolithic IC MM1292
Outline
This IC is for protecting a lithium ion battery from overcharging, excess discharging, and overcurrent. If
abnormalities occur during charging and excess voltage is applied, it has a function that turns off the external
FET switch when voltage is applied to each battery beyond a specified time (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. Also, when there is a large current flow due to shorting or other
reasons, there is a function for turning off the external FET switch (overcurrent detection).
These functions comprise a protection circuit, with few external parts, for lithium ion batteries.
2-Cell Protection ICs
Overcharge protection
Detection voltage Hysteresis
4.25±±.±5ꢀ 1±mꢀ
Overdischarge protection
Overcurrent
Detection voltage
22±±2±mꢀ
15±±15mꢀ
15±±15mꢀ
15±±15mꢀ
None
Model name
Detection voltage
2.3ꢀ±±.1ꢀ
2.4ꢀ±±.1ꢀ
2.4ꢀ±±.1ꢀ
2.4ꢀ±±.1ꢀ
None
Hysteresis
7±±mꢀ
6±±mꢀ
6±±mꢀ
6±±mꢀ
MM1302A
MM1292C
MM1292D
MM1302E
MM1302F
MM1302G
MM1292H
MM1292J
MM1292K
MM1292L
4.25±±.±5ꢀ
4.35±±.±5ꢀ
4.1±±±.±5ꢀ
4.35±±.±5ꢀ
4.215±35ꢀ
4.3±±±.±5ꢀ
4.25±±.±5ꢀ
4.25±±.±5ꢀ
4.25±±.±5ꢀ
2±±mꢀ
2±±mꢀ
1±mꢀ
1±mꢀ
1±mꢀ
22±mꢀ
22±mꢀ
22±mꢀ
22±mꢀ
2.3ꢀ±±.1ꢀ
2.±5ꢀ±±.1ꢀ
2.4ꢀ±±.1ꢀ
2.4ꢀ±±.1ꢀ
2.2ꢀ±±.1ꢀ
7±±mꢀ
95±mꢀ
6±±mꢀ
6±±mꢀ
8±±mꢀ
22±±2±mꢀ
17±±15mꢀ
15±±15mꢀ
15±±15mꢀ
1±±±1±mꢀ
Features
1. Current consumption (during overcharging)
2. Current consumption (normal)
VCELL=4.5V
VCELL=3.5V
VCELL=1.9V
VCELL=1.0V
80µA typ.
13µA typ.
0.5µA typ.
0.1µA max.
3. Current consumption (during excess discharging)
4. Current consumption (during excess discharging)
5. Overcharge detection voltage (Ta=
-20°C~+70°C)
4.25V 50mV (detection for each cell)
200mV 60mV (detection for each cell)
2.4V 0.1V (detection for each cell)
3.0V 0.1V (detection for each cell)
150mV 15mV
6. Hysteresis voltage
7. Excess discharge detection voltage
8. Discharge resumption voltage
9. Overcurrent detection voltage
10.Reset after overcurrent detection
11.Operating limit voltage
load release
0.9V max.
Package
SOP-8C, SOP-8D(MM1292 F)
The box represents the rank resulting from the combination of protection functions.
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