MITSMI MM1291MW, MM1291AW, MM1291KF, MM1291HW, MM1291HF Datasheet
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MITSUMI
Protection of Lithium Ion Batteries (one cell) MM1291
Protection of Lithium Ion Batteries (one cell)
Monolithic IC MM1291
Outline
1-Cell Protection ICs
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.
Package
Overcharge
Overdischarge
Release Overcurrent detection
detection
Hysteresis
Dead time
detection voltage
Delay
SOP-8 VSOP-8
voltage
Overcurrent Detec time shot-mode
MM1291AF AW 4.35V 200mV
*
2.6V 2.4V
2.9V 100mV No
BF BW 4.25V 200mV
*
2.6V 2.4V
2.9V 100mV No
CF 4.10V 25mV
*
2.6V 2.4V
2.9V 150mV No
DF 4.35V 25mV
*
2.6V 2.4V
2.9V 100mV No
EF 4.35V 27mV
*
2.6V 2.4V
2.9V 100mV No
GF 4.225V 27mV
*
2.6V 2.4V
2.9V 100mV No
HF HW 4.35V 200mV
*
2.6V 2.4V
2.9V 50mV 0.45V
JW 4.25V 270mV 2.3V 2.9V 125mV 0.45V
KF 4.25V 200mV 2.3V 2.9V 50mV 0.9V
MW 4.30V 270mV 2.3V 2.9V 125mV 0.45V
at
Ctd=
0.082µF
min. 0.5S
typ. 1S
max. 1.5S
min. 5mS
typ. 10mS
max. 15mS
min. 5mS
typ. 10mS
max. 15mS
Note : Under open-load conditions, returns to normal mode from overcurrent mode.
(For MM1291A to G, J, M, 5MΩ or higher; for MM1291H, K, 50MΩ or higher)
MITSUMI
Protection of Lithium Ion Batteries (one cell) MM1291
Features
1. Current consumption (during overcharging) VCC=4.5V VCC pin 40µA typ. VIN pin 3µA typ.
2. Current consumption (normal) V
CC=3.5V VCC pin 7µA typ. VIN pin 2µA typ.
3. Current consumption (during excess discharge) V
CC=1.9V 0.7µA typ.
4. Consumption current (during excess discharge) V
CC=1.0V 0.17µA max.
5. Overcharge detection voltage (Ta=
-
20°C~+70°C) A 4.35V±50mV
B 4.25V±50mV
C 4.10V±50mV
6. Overcharge detection hysteresis A 200mV typ.
B 200mV typ.
C 27mV typ.
7. Overcharge non-induction time C
TD=0.082µF 1S typ.
8. Excess discharge voltage 1 V
CS=0V 2.6V±0.1V
9. Excess discharge voltage 2 V
CS=0.05V 2.4V±0.1V
10.Excess discharge reset voltage 2.9V±0.12V
11.Excess discharge during non-induction 10mS typ.
12.Overcurrent detection voltage A 100mV±10mV
B 100mV±10mV
C 150mV±15mV
13.Reset after overcurrent detection load release
14.Overcurrent detection non-induction time 10mS typ.
Package
SOP-8C, SOP-8D (MM1291 F)
VSOP-8A (MM1291 W)
*
The box represents the rank resulting from the combination of protection functions.
Applications
1. Cellular phones
2. PHS
3. MD
4. others
MITSUMI
Protection of Lithium Ion Batteries (one cell) MM1291
Pin Assignment
1432
8567
SOP-8C/SOP-8D
1 GND
2 GD
3 CS
4 OC
5 CE
6 TD
7 V
CC
8 VIN
Pin Description
Pin NO.
NAME I/O Description
1 GND Input
Negative power supply for this IC. Also acts as detection pin for the battery
connected between V
IN-GND.
2 GD Output
Nch-FET gate connection pin for discharge control. Switches gate OFF when
excess discharge is detected, and for current protection. Switches gate ON when
excess discharge is detected in normal state.
3 CS Input
Detection pin for voltage between CS-GND. Detects excess discharge using Nch-
FET (discharge control) ON resistor and discharge current.
4 OC Output
Control pin for Nch-FET for charge control. Switches FET off by activating an
external transistor when excess charging is detected.
5 N.C
6 TD Input
This pin sets non-induction time for overcharge detection. It charges the capacitor
connected between TD-GND with a fixed current during overcharging.
7 V
CC Input Positive power supply pin for the IC.
8 V
IN Input Detection pin for the battery connected between VIN-GND.
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