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MITSUMI
Protection of Lithium Ion Batteries (four cells in series) MM1294
Protection of Lithium Ion Batteries (four cells in series)
Monolithic IC MM1294
Outline
This IC provides protection for lithium ion batteries in the event of overcharging, overdischarging and overcurrents. When anomalies occur during charging or at other times and excessive voltages are applied, after a certain time has elapsed for each cell an external FET switch is turned off (overcharging detection); and in order to prevent overdischarge of the battery during discharge, when the voltage of individual batteries falls below a fixed voltage, an external FET switch is turned off (overdischarge detection), and the IC is put into low-consumption current mode. When large currents flow due to a short-circuit or other cause, an external MOS switch is turned off (overcurrent detection).
4-Cell Protection ICs
Rank A B C Overcurrent Overcharge Overcharge Overdischarge Overdischarge Overcurrent At overcurrent detection voltage hysteresis voltage detection voltage resume voltage detection voltage detection release conditions Load release 4.35V50mV 200mV typ. 2.35V typ. 3.05V typ. 150mV typ. Pin 3 (DOHG pin) L H 300k or more 4.25V50mV 2.40V typ. 3.10V typ. Same as rank A 200mV typ. Same as rank A Charging reset
Features
1. Current consumption (overcharging) VCELL > VCELLU 170A typ. 2. Current consumption (normal operation) VCELL < VALM 35A typ. 3. Current consumption (overdischarge) VCELL < VCELLS 0.1A max. 4. Overcharge detection voltage (-20 to +70C) VCELL : L H 4.25V50mV/CELL 5. Overcharge hystereis voltage VCELL : H L VCELLU-200mV/CELL typ. 6. Overcharge sensing dead time C=0.1F 1.0S typ. 7. Overcharge sensing operation voltage VCELL : L H 4.10V150mV/CELL 8. Overdischarge detection voltage VCELL : H L 2.40V/CELL typ. 9. Overdischarge sensing dead time C=0.1F 1.0S typ. 10.Overcurrent detection voltage 0.15V typ. 11.Overcharge and overdischarve voltages as well as the overcurrent detection voltage can be changed upon request.
Package
SSOP-16
Applications
Lithium ion battery pack for notebook computers
MITSUMI
Protection of Lithium Ion Batteries (four cells in series) MM1294
Block Diagram
Pin Assignment
1 2 16 15 14 13 12 11 10 9 3 4 5 12345678 SSOP-16 6 7 8 OV CS DCHG PF CDC COL COV GND 9 10 11 12 13 14 15 16 V4 VCC V3 V2 V1
MITSUMI
Protection of Lithium Ion Batteries (four cells in series) MM1294
Pin Description
Pin no. Pin name Input/ output Output Function Overcharge detection output pin NPN transistor open collector output; normally high impedance, goes to L level on overdischarge Overcurrent detection pin Monitors equivalent load current through source-drain voltage drop of discharge-controlling FET, and at or above the overcurrent detection voltage sets the DCHG pin to "H" and turns off the discharge-controlling FET. Following overcurrent detection, current is passed from this pin, and if the load is decreased, the overcurrent mode is canceled. Through this action there is a temporary consumption current (at the VCC pin) of approx. 1 mA on resumption of discharge and detection of overdischarge. This function is disabled in overdischarge mode. Pin driving the discharge-controlling FET (P-ch) Normally "L"; on overdischarge set to "H" Output pin for overdischarge detection signals Overdischarge detection signal output pin When the overdischarge detector detects overdischarge at the open collector output of the NPN transistor, this pin is turned on. A delay is provided by setting a dead time until discharge ends, so that by utilizing a reset or other signal from a CPU or some other controlling device, the equipment can be put into standby mode. Pin to set the dead time for overdischarge detection By connecting a capacitor between the CDC pin and GND, a dead time can be set. Pin to set the dead time for overcurrent detection By connecting a capacitor between the COL pin and GND, a dead time can be set. If NC, protection is triggered in a short amount of time; the dead time should be set according to the application. Pin to set the dead time for overcharge detection By connecting a capacitor between the COV pin and GND, a dead time can be set. Ground pin Pin for input of V1 cell high-side voltage and V2 cell low-side voltage N.C Pin for input of V2 cell high-side voltage and V3 cell low-side voltage N.C Pin for input of V3 cell high-side voltage and V4 cell low-side voltage N.C Pin for input of V4 cell high-side voltage Power supply input pin The same potential as the V4 pin should be input
1
OV
2
CS
Input
3
DCHG
Output
4
PF
Output
5
CDC
Input
6
COL
Input
7 8 9 10 11 12 13 14 15 16
COV GND V1 V2 V3 V4 VCC
Input Input Input Input Input Input Input
Absolute Maximun Ratings
Item Storage temperature Operating temperature Charge voltage Power supply voltage
(Ta=25C) Symbol TSTG TOPR VV4 max. VCC max. VOV max. Pd Ratings -40~+125 -20~+70 24 24 24 300 Units C C V V V mW
Voltage applied to OV pin Allowable loss
MITSUMI
Protection of Lithium Ion Batteries (four cells in series) MM1294
Recommended Operating Conditions
Item Operating temperature Operating voltage Symbol TOPR VOPR Ratings -20~+70 +2~+24 Units C V
Electrical Characteristics
Item Consumption current (VCC pin) 1 Consumption current (VCC pin) 2 Consumption current (VCC pin) 3 Consumption current (V4 pin) 1 Consumption current (V4 pin) 2 Consumption current (V4 pin) 3 V3 pin input current 1 V3 pin input current 2 V2 pin input current 1 V2 pin input current 2 V1 pin input current 1 V1 pin input current 2 Overcharge detection voltage Overcharge detection release voltage Overcharge sensing dead time Overcharge sensing operation voltage
(Except where noted otherwise, Ta=25C, VCC=20V, VCELL=V4=V3=V2=V1) Symbol ICC1 ICC2 ICC3 IV41 IV42 IV43 IV3 IV3A IV2 IV2A IV1 IV1A VCELLU VCELL0 tOV VALM VALM VCELLS VCELLD VCSD tCDC1 tCDC2 VOC tCOL1 tCOL2 tCOL3 tCOL4 ISODCH ISIDCH VTHDCH VTHDCL ISIOV ISIPF Measurement conditions VCELL=4.4V VCELL=3.5V VCELL=2.2V VCELL=4.4V VCELL=3.5V VCELL=2.2V VCELL=3.5V VCELL=4.4V VCELL=3.5V VCELL=4.4V VCELL=3.5V VCELL=4.4V Ta=-20~+70C, VCELL : 3.7V VCELL : 4.5V 3.7V 4.5V -0.6 4.20 -0.3 4.25 -0.6 -0.3 -0.6 -0.3 15 5 2 Min. Typ. Max. Units 170 35 340 70 0.1 30 10 4 300 0 300 0 300 0 4.30 A A A A A A nA A nA A nA A V V S V mV V V mV S mS V mS mS S S A A 1.8 0.8 0.2 10 V V mA A 15 15
VCELLU VCELLU VCELLU -260mV -200mV -140mV 0.5 3.95 130 2.30 2.95 490 0.5 1.0 4.10 230 2.40 3.10 700 1.0 7 0.135 0.150 0.165 5 5 10 10 150 150 20 20 1.5 4.25 330 2.50 3.25 910 1.5
COV=0.1F VCELL : 3.5V VCELL : 4.4V VCELL : 3.5V VCELL : 2.0V 4.4V 3.5V 2.0V 3.5V
Overdischarge sensing hysteresis voltage Overdischarge detection voltage Discharge resume voltage Overdischarge sensing hysteresis voltage Overdischarge sensing dead time Overdischarge reset dead time Overcurrent detection voltage Overcurrent sensing dead time Overcurrent reset dead time Overcurrent sensing delay time Overcurrent reset delay time Overcurrent protection release DCHG pin source current DCHG pin sync current DCHG pin output voltage H DCHG pin output voltage L OV pin sync current PF pin sync current
VCELLD-VCELLS CCDC=0.1F CCDC=0.1F, VCS=VCC+0.3V VCC-VCS, DCHG CCOL=0.001F, DCHG CCOL=0.001F, DCHG CCOL=0, DCHG CCOL=0, DCHG VCELL < VCELLS, SW1 : A, VDCHG=VCC-1.8V VCELL > VCELLS, SW1 : A, VDCHG=0.8V VCC-VDCHG, ISO=20A, SW1 : B VDCHG-GND, ISI=-20A, SW1 : B VOV=0.4V, Ta=-20~+70C VPF=0.4V, Ta=-20~+70C
Open-load condition 300 k
MITSUMI
Protection of Lithium Ion Batteries (four cells in series) MM1294
Timing Chart
Overcharge
Charging off Overcharge detection voltage Cell voltage Overcharge detection cancel voltage
COV pin
tOV
Sensing dead zone Pin OV
(pulled up)
Overcharge state
Normal state
Overdischarge
Discharge off Cell voltage
Discharge resume voltage Overdischarge detection voltage
CDC pin
tCDC1
tCDC2
Sensing dead zone DCHG pin Overdischarge state Pin PF
(pulled up)
Reset dead zone
Normal state
MITSUMI
Protection of Lithium Ion Batteries (four cells in series) MM1294
Application circuits
Characteristics
Overcharge, overdischarge sensing dead
1
Dead time t (s)
100m
10m
1m 100P
1000P
0.01
0.1
Capacitance C (F) Note : The above characteristics are representative and are not guaranteed.

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