MITSUMI
Protection of Lithium Ion Batteries (one cell) MM1291
Protection of Lithium Ion Batteries (one cell)
Monolithic IC MM1291
Outline
This is a protection IC for one-cell series that protects lithium ion batteries during excess charging,
discharging, or 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 functions for turning off the external FET switch
(overcurrent detection). These function comprise a protection circuit, with few external parts, for lithium ion
batteries.
1-Cell Protection ICs
Overcharge
detection
SOP-8
VSOP-8 voltage
MM1291AF
AW
4.35V
BF
BW
4.25V
CF
4.10V
DF
4.35V
EF
4.35V
GF
4.225V
HF
HW
4.35V
JW
4.25V
KF
4.25V
MW
4.30V
Package
Hysteresis Dead time
200mV
200mV
25mV
25mV
27mV
27mV
200mV
270mV
200mV
270mV
Overdischarge Release
detection voltage
Delay
Overcurrent detection
Detec time shot-mode
No
No
No
min. 5mS
No
No
typ. 10mS
No
0.45V
max. 15mS
0.45V
0.9V
0.45V
at
Ctd=
0.082碌F
min. 0.5S
typ. 1S
max. 1.5S
*
2.6V 2.4V
*
2.6V 2.4V
*
2.6V 2.4V
*
2.6V 2.4V
*
2.6V 2.4V
*
2.6V 2.4V
*
2.6V 2.4V
2.3V
2.3V
2.3V
2.9V
2.9V
2.9V
2.9V
2.9V
2.9V
2.9V
2.9V
2.9V
2.9V
Overcurrent
100mV
100mV
150mV
min. 5mS
100mV
100mV
typ. 10mS
100mV
50mV
max. 15mS
125mV
50mV
125mV
Note : Under open-load conditions, returns to normal mode from overcurrent mode.
(For MM1291A to G, J, M, 5M鈩?or higher; for MM1291H, K, 50M鈩?or higher)
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