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MITSUMI
Protection of Lithium Ion Batteries (three cells in series) MM1293
Protection of Lithium Ion Batteries (three cells in series)
Monolithic IC MM1293
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 (overdischarging 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).
3-Cell Protection ICs
Rank A B C D E F G Overcharge Overcharge Overdischarge Overdischarge Overcurrent At overcurrent Overcurrent release detection voltage hysteresis voltage detection voltage resume voltage detection voltage detection conditions Load release 4.35V50mV 200mV typ. 2.35V typ. 3.05V typ. 150mV typ. Pin 3 (DOHG pin) L H 250k or more 4.25V50mV 2.40V typ. 3.10V typ. Same as rank A Same as rank A Pin 4 (OL pin) H L Same as rank B Same as rank B none (several mV) Same as rank B Pin 3 (DOHG pin) L H 4.10V50mV 2.35V typ. 3.00V typ. Same as rank A 200mV typ. Same as rank A Charging reset
Features
1. Current consumption (overcharging) VCELL > VCELLU 125A typ. 2. Current consumption (normal operation) VCELL < VALM 30A 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 (three cells in series) MM1293
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 MSW 9 10 11 12 13 14 15 16 GND ML BATL MM BATM MH BATH VCC
MITSUMI
Protection of Lithium Ion Batteries (three cells in series) MM1293
Pin Assignment
Pin no. 1 Pin name Input/output OV 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 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 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. Pin to switch the cell voltage monitor on/off GND: monitor on, VCC: monitor off The cell voltage monitor converts the different cell voltages to a GNDreference voltage and outputs it from the ML, MM and MH pins. Ground pin Monitor output pin for the L cell voltage Pin for input of L cell high-side voltage and M cell low-side voltage Monitor output pin for the M cell voltage Pin for input of M cell high-side voltage and H cell low-side voltage Monitor output pin for the H cell voltage Pin for input of H cell high-side voltage Power supply input pin The same potential as the BATH pin should be input
2
CS
Input
3
DCHG
Output
4
PF
Output
5
CDC
Input
6
COL
Input
7
COV
Input
8 9 10 11 12 13 14 15 16
MSW GND ML BATL MM BATM MH BATH VCC
Input Input Output Input Output Input Output Input Input
Absolute Maximun Ratings
Item Storage temperature Operating temperature Charge voltage Power supply voltage
(Ta=25C) Symbol TSTG TOPR VBAT max. VCC max. VOV max. Pd Ratings -40~+125 -20~+70 18 18 18 300 Units C C V V V mW
Voltage applied to OV pin Allowable loss
MITSUMI
Protection of Lithium Ion Batteries (three cells in series) MM1293
Recommended Operating Conditions
Item Operating temperature Operating voltage Symbol TOPR VOPR Ratings -20~+70 +2~+18 Units C V
Electrical Characteristics
Item Consumption current (VCC pin) 1 Consumption current (VCC pin) 2 Consumption current (VCC pin) 3 Consumption current (BATH pin) 1 Consumption current (BATH pin) 2 Consumption current (BATH pin) 3 BATM pin input current 1 BATM pin input current 2 BATL pin input current 1 BATL pin input current 2 Overcharge detection voltage Overcharge detection release voltage Overcharge sensing dead time Overcharge sensing operation voltage 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
(Except where noted otherwise, Ta=25C, VCC=15V, VCELL=VBATH=VBATM=VBATL) Symbol ICC1 ICC2 ICC3 IBATH1 IBATH2 IBATH3 IBATM IBATMA IBATL IBATLA VCELLU VCELLO 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 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 11 5 2 Min. Typ. Max. Units 125 30 250 60 0.1 22 10 4 300 0 300 0 4.30 A A A A A 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 3.95 120 2.30 2.95 490 0.5 1.0 4.10 200 2.40 3.10 700 1.0 7 0.135 0.150 0.165 5 5 10 10 150 150 20 20 1.5 4.25 300 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
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 250k
MITSUMI
Protection of Lithium Ion Batteries (three cells in series) MM1293
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 Overdischarge detection voltage Discharge resume voltage
CDC pin
tCDC1 Sensing dead zone DCHG pin Overdischarge state Pin PF
(pulled up)
tCDC2 Reset dead zone
Normal state
Overcurrent
Current passed from pin CS Load released
CS pin
COL pin
tCOL Sensing dead zone
tCOL Reset dead zone
DCHG pin Normal state Overcurrent state Normal state
MITSUMI
Protection of Lithium Ion Batteries (three cells in series) MM1293
Application circuits
Characteristics
Overcharge, overdischarge sensing dead time
1
Overcurrent dead time
100m
Dead time t (s)
100m
Dead time t (s)
1000P 0.01 0.1
10m
10m
1m
1m 100P
10P
100P
0.001
0.01
Capacitance C (F)
Capacitance C (F)
Note : The above characteristics are representative and are not guaranteed.

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