MITSUMI
Protection of Lithium Ion Batteries (two cells in series) MM1292
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
Model name
MM1302A
MM1292C
MM1292D
MM1302E
MM1302F
MM1302G
MM1292H
MM1292J
MM1292K
MM1292L
Overcharge protection
Detection voltage
Hysteresis
4.25鹵0.05V
10mV
4.25鹵0.05V
200mV
4.35鹵0.05V
200mV
4.10鹵0.05V
10mV
4.35鹵0.05V
10mV
4.215鹵35V
10mV
4.30鹵0.05V
220mV
4.25鹵0.05V
220mV
4.25鹵0.05V
220mV
4.25鹵0.05V
220mV
Overdischarge protection
Detection voltage
Hysteresis
2.3V鹵0.1V
700mV
2.4V鹵0.1V
600mV
2.4V鹵0.1V
600mV
2.4V鹵0.1V
600mV
None
2.3V鹵0.1V
700mV
2.05V鹵0.1V
950mV
2.4V鹵0.1V
600mV
2.4V鹵0.1V
600mV
2.2V鹵0.1V
800mV
Overcurrent
Detection voltage
220鹵20mV
150鹵15mV
150鹵15mV
150鹵15mV
None
220鹵20mV
170鹵15mV
150鹵15mV
150鹵15mV
100鹵10mV
Features
1. Current consumption (during overcharging)
2. Current consumption (normal)
3. Current consumption (during excess discharging)
4. Current consumption (during excess discharging)
5. Overcharge detection voltage (Ta=-20擄C~+70擄C)
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
V
CELL
=4.5V
V
CELL
=3.5V
V
CELL
=1.9V
V
CELL
=1.0V
80碌A(chǔ) typ.
13碌A(chǔ) typ.
0.5碌A(chǔ) typ.
0.1碌A(chǔ) max.
4.25V鹵50mV (detection for each cell)
200mV鹵60mV (detection for each cell)
2.4V鹵0.1V (detection for each cell)
3.0V鹵0.1V (detection for each cell)
150mV鹵15mV
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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