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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= 0.082F 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 or higher; for MM1291H, K, 50M or higher)
MITSUMI
Protection of Lithium Ion Batteries (one cell) MM1291
Features
1. 2. 3. 4. 5. Current consumption (during overcharging) Current consumption (normal) Current consumption (during excess discharge) Consumption current (during excess discharge) Overcharge detection voltage (Ta=-20C~+70C) VCC=4.5V VCC=3.5V VCC=1.9V VCC=1.0V VCC pin 40A typ. VCC pin 7A typ. 0.7A typ. 0.17A max. A 4.35V50mV B 4.25V50mV C 4.10V50mV A 200mV typ. B 200mV typ. C 27mV typ. 1S typ. 2.6V0.1V 2.4V0.1V 2.9V0.12V 10mS typ. A 100mV10mV B 100mV10mV C 150mV15mV load release 10mS typ. VIN pin 3A typ. VIN pin 2A typ.
6. Overcharge detection hysteresis
7. Overcharge non-induction time 8. Excess discharge voltage 1 9. Excess discharge voltage 2 10.Excess discharge reset voltage 11.Excess discharge during non-induction 12.Overcurrent detection voltage
CTD=0.082F VCS=0V VCS=0.05V
13.Reset after overcurrent detection 14.Overcurrent detection non-induction time
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. 2. 3. 4. Cellular phones PHS MD others
MITSUMI
Protection of Lithium Ion Batteries (one cell) MM1291
Pin Assignment
1 2 8 7 6 5 3 4 5 1 2 3 4 6 7 SOP-8C/SOP-8D 8
GND GD CS OC CE TD VCC VIN
Pin Description
Pin NO. NAME GND I/O Input connected between VIN-GND. Nch-FET gate connection pin for discharge control. Switches gate OFF when 2 GD Output excess discharge is detected, and for current protection. Switches gate ON when excess discharge is detected in normal state. Detection pin for voltage between CS-GND. Detects excess discharge using Nch3 CS Input FET (discharge control) ON resistor and discharge current. Control pin for Nch-FET for charge control. Switches FET off by activating an 4 OC Output external transistor when excess charging is detected. N.C This pin sets non-induction time for overcharge detection. It charges the capacitor 6 TD VCC VIN Input connected between TD-GND with a fixed current during overcharging. 7 8 Input Input Positive power supply pin for the IC. Detection pin for the battery connected between VIN-GND. Description Negative power supply for this IC. Also acts as detection pin for the battery 1
5
MITSUMI
Protection of Lithium Ion Batteries (one cell) MM1291
Block Diagram
VS indicates average values. VALML is low due to the effect of R1 linked to the VIN pin.
*1
A : 4.150V B : 4.050V C : 4.073V
*2
A : 4.350V B : 4.250V C : 4.100V
*3
A : 0.10V B : 0.10V C : 0.15V
Timing Chart
Charge Excess Normal discharge Excess Normal Excess discharge Charge Charge Charge Overcurrent protection Overcurrent protection Excess Normal discharge Normal Normal Normal Excess discharge
VIN (VCC) CS
VALM VALML VDF VS1 0V unsettled 0V VCS VST Load release
Load release Load release unsettled
*
1 1.0V
TOO GD 0V
TOC1
TOD
TOC2
TOC2
TD
0V
TALM OC 0V
*1 C only
MITSUMI
Protection of Lithium Ion Batteries (one cell) MM1291
MM1291AFBE Absolute Maximum Ratings (Ta=25C)
Item Storage temperature Operating temperature Power supply voltage VCC-OC pin voltage CS pin voltage Allowable loss Symbol TSTG TOPR VCC VOC VCS PD Rating -40~+125 -20~+70 -0.3~+18 -18~0 -0.6~VCC 300 Units C C V V V mV
* The CS pin will not cause abnormal operation when connected to protection resistor RCS (=4.7k)
Electrical Characteristics
(Unless otherwise specified Ta=25C, VCC=VIN=3.5V, VCS=0V, Measurement circuit 1, SW1 : a) Symbol ICC1 IOP2 VALM Measurement Conditions VCC=VIN=3.5V VCC=VIN=1.9V Ta=-20C~70C VCC=VIN=4.0V 4.5V VOC : L H VCC=VIN=4.5V 4.0V VOC : H L VOC-VOCR VCC=VIN=3.1V 2.0V VGD : H L, VCS=0V VCC=VIN=3.1V 2.0V VCS=0.05V, VGD : H L VCC=VIN=2.0V 3.1V VGD : L H VCC=VIN=2.75V VCS=0V -0.5V, VGD : L H VCS=0V 0.12V VGD : H L VCC=VIN=3.0V 2.4V, 1 measurement circuit 2, SW1 : b, SW2 : a VCS=0V VCS, 1 measurement circuit 2, SW1 : a, SW2 : b VCC=VIN=4.0V 4.5V, 1 measurement circuit 2, SW1 : b, SW2 : a CTD=0.082F VCC When VGDL2 > 0.4V Min. Typ. Max. Units 8.0 11.0 A 0.7 1.0 A 4.300 4.350 4.400 V
Item 1 (Normal mode) (IS1=ICC+IIN) Consumption current 2 (Overdischarge mode) Overcharge detection voltage
Overcharge reset voltage Overcharge hysteresis voltage Excess discharge detection voltage 1 Excess discharge detection voltage 2 Excess discharge reset voltage Starting voltage Overcurrent detection voltage Overcurrent protection release Excess discharge detection non-induction time Excessive current detection during non-induction time Overcurrent non-induction time Operating limit voltage 2
VALML VALM VS1 VS2 VODR VST VCS
4.050 4.150 4.240 150 2.50 2.30 2.78 -0.3 90 200 2.60 2.40 2.90 -0.1 100 110 250 2.70 2.50 3.02
V mV V V V V mV
load release (more than 5 MEG)
tOD tOC1 tALM
VOP VGDH VGDL1 VGDL2 IOC
*
5.0 5.0
10.0 10.0
15.0 15.0
mS mS
*
*
0.5
1.0
1.5 1.2
S V V
*
GD pin output voltage H GD pin output voltage L1 GD pin output voltage L2 OC pin output current
VCC=VIN=3.5V VCC=VIN=3.5V, VCS=0.5V VCC=VIN=1.5V VCC=VIN=4.5V, SW1 : b
VCC -0.3
VCC -0.1 0.1 0.2
0.3 0.4 -30
V V uA
*1 *2
Refer to input waveforms. Operation is unstable below the operating limit voltage.
MITSUMI
Protection of Lithium Ion Batteries (one cell) MM1291
MM1291BFBE Absolute Maximum Ratings
Item Storage temperature Operating temperature Power supply voltage VCC-OC pin voltage CS pin voltage Allowable loss (Ta=25C) Symbol TSTG TOPR VCC VOC VCS PD Rating -40~+125 -20~+70 -0.3~+18 -18~0 -0.6~VCC 300 Units C C V V V mV
*The CS pin will not cause abnormal operation when connected to protection resistor RCS (=4.7k)
Electrical Characteristics
(Unless otherwise specified Ta=25C, VCC=VIN=3.5V, VCS=0V, Measurement circuit 1, SW1 : a) Symbol ICC1 IOP2 VALM Measurement Conditions VCC=VIN=3.5V VCC=VIN=1.9V Ta=-20C~70C VCC=VIN=3.9V 4.4V VOC : L H VCC=VIN=4.4V 3.9V VOC : H L VOC-VOCR VCC=VIN=3.1V 2.0V VGD : H L VCS=0V VCC=VIN=3.1V 2.0V VCS=0.05V, VGD : H L VCC=VIN=2.0V 3.1V VGD : L H VCC=VIN=2.75V VCS : 0V -0.5V, VGD : L H VCS=0V 0.12V VGD : H L VCC=VIN=3.0V 2.4V, 1 measurement circuit 2, SW1 : b, SW2 : a VCS=0V VCS, 1 measurement circuit 2, SW1 : a, SW2 : b VCC=VIN=4.0V 4.5V, 1 measurement circuit 2, SW1 : b, SW2 : a CTD=0.082F VCC When VGDL2 > 0.4V Min. Typ. Max. Units 10.0 14.0 A 0.7 1.0 A 4.200 4.250 4.300 V
Item 1 (Normal mode) (IS1=ICC+IIN) Consumption current 2 (Overdischarge mode) Overcharge detection voltage
Overcharge reset voltage Overcharge hysteresis voltage Excess discharge detection voltage 1 Excess discharge detection voltage 2 Excess discharge reset voltage Starting voltage Overcurrent detection voltage Overcurrent protection release Excess discharge detection non-induction time Excessive current detection during non-induction time Overcurrent non-induction time Operating limit voltage
VALML VOCH VS1 VS2 VDF VST VCS
3.950 4.050 4.150 150 2.50 2.30 2.78 -0.3 90 200 2.60 2.40 2.90 -0.1 100 110 250 2.70 2.50 3.02
V mV V V V V mV
load release (more than 5 MEG)
tOD tOC1 tALM
VOP VGDH VGDL1 VGDL2 IOC
*
5.0 5.0
10.0 10.0
15.0 15.0
mS mS
*
*
0.5
1.0
1.5 1.2
S V V
*2
GD pin output voltage H GD pin output voltage L1 GD pin output voltage L2 OC pin output current
VCC=VIN=3.5V VCS > 1.0V VCC=VIN=3.5V, VCS=0.5V VCC=VIN=4.5V, SW1 : b
VCC -0.3
VCC -0.1 0.1 0.2
0.3 0.4 -30
V V uA
*1 *2
Refer to input waveforms. Operation is unstable below the operating limit voltage.
MITSUMI
Protection of Lithium Ion Batteries (one cell) MM1291
MM1291CFBE Absolute Maximum Ratings
Item Storage temperature Operating temperature Power supply voltage
VCC-OC pin voltage
(Ta=25C) Symbol TSTG TOPR VCC VOC VCS PD Rating -40~+125 -20~+70 -0.3~+18 -18~0 -0.6~VCC 300 Units C C V V V mV
CS pin voltage Allowable loss
* The CS pin will not cause abnormal operation when connected to protection resistor RCS (=4.7k )
Electrical Characteristics
(Unless otherwise specified Ta=25 C, VCC=VIN=3.5V, VCS=0V, Measurement circuit 1, SW1 : a) Symbol ICC1 ICC2 IIN1 IIN2 IOP3 IOP4 VALM VALML VALM VS1 VS2 VDF VST VCS Measurement Conditions VCC=4.5V VCC=3.5V VIN=4.5V VIN=3.5V VCC=VIN=1.9V VCC=VIN=1.0V Ta=-20C~70C VCC=VIN=4.0V 4.2V VCC : L H VCC=VIN=4.2V 4.0V VOC : H L VALM-VALML VCC=VIN=3.1V 2.0V VGD : H L VCC=VIN=3.1V 2.0V VCS=0.05V, VGD : H L VCC=VIN=2.0V 3.1V VGD : L H VCC=VIN=2.75V VCS=0V -0.5V, VGD : L H VCS=0V 0.17V VGD : H L VCC=VIN=3.0V 2.4V, 1 measurement circuit 2, SW1 : b, SW2 : a VCS=0V VCS, 1 measurement circuit 2, SW1 : a, SW2 : b VCS=0V 1.0V, 1 measurement circuit 2, SW1 : b, SW2 : a VCC=VIN=4.0V 4.5V, 1 measurement circuit 2, SW1 : b, SW2 : a CTD=0.082F Min. Typ. Max. Units 40 60 A 8.0 11.0 A 3.0 5.0 A 2.0 3.0 A 0.7 1.0 A 0.17 A 4.050 4.100 4.150 4.018 4.075 4.128 18 2.50 2.30 2.78 -0.3 135 25 2.60 2.40 2.90 -0.1 150 165 32 2.70 2.50 3.02 V V mV V V V V mV Item Current consumption 1 (VCC pin) Current consumption 2 (VCC pin) Current consumption 1 (VIN pin) Current consumption 2 (VIN pin) Current consumption 3 (VCC, VIN pins) Current consumption 4 (VCC, VIN pins) Overcharge detection voltage Overcharge reset voltage Overcharge hysteresis voltage Excess discharge detection voltage 1 Excess discharge detection voltage 2 Excess discharge reset voltage Starting voltage Overcurrent detection voltage Overcurrent protection release Excess discharge detection non-induction time Excessive current detection during non-induction time Overcurrent detection delay Overcurrent non-induction time Operating limit voltage
load release (more than 5 MEG)
tOD tOC1 tOC2 tALM
VOP VGDH VGDL1 VGDL2 IOC
*
5.0 5.0
10.0 10.0
15.0 15.0 100
mS mS S S V V
* *
*
0.5
1.0
1.5 1.2
*2
VCC When VGDL2 > 0.4V
GD pin output voltage H GD pin output voltage L1 GD pin output voltage L2 OC pin output current
VCC -0.3 VCS > 1.0V VCC=VIN=1.5V VCC=VIN=4.5V, SW1 : b
VCC -0.1 0.1 0.2
0.3 0.4 -30
V V uA
*1 *2
Refer to input waveforms. Operation is unstable below the operating limit voltage.

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