MM1309

MITSUMI Protection of Lithium Ion Battery (three cells in series) MM1309 Protection of Lithium Ion Batteries (three cells in series) Monolithic IC MM1309 Outline This is a 3-cell series protection IC is for protecting a lithium ion battery from overcharging and excess discharging. If abnormalities occur during charging and excess voltage is applied, it has a function that turns off the external FET switch (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. These functions comprise a protection circuit, with few external parts, for lithium ion batteries. Features 1. 2. 3. 4. 5. 6. 7. 8. Current consumption (for VCC pin) Current consumption (for VCC pin) Current consumption (for VCC pin) Current consumption (for VCC pin) Current consumption (for BATH pin) Current consumption (for BATH pin) Current consumption (for BATH pin) Charge prohibit voltage (Ta=-20°C~+70°C) VCELL=4.4V VCELL=4.2V VCELL=3.8V VCELL=2.2V VCELL=4.4V VCELL=3.8V VCELL=2.2V 700µA typ. 300µA typ. 25µA typ. 0.1µA max. 12µA typ. 8µA typ. 1µA typ. B : 4.35V±50mV C : 4.25V±50mV VCELLU-45mV B : 4.20V typ. C : 4.10V typ. 2.40V±0.09V, 2.35V±0.09V B : 2.65V±0.16V C : 2.60V±0.16V 250±75mV 9. Charge prohibit release voltage 10.Charge prohibit detection function operation voltage 11.Excess discharge detection voltage 12.Discharge resumption voltage 13.Excess discharge detection hysteresis voltage Package SOP-8C (MM1309 F) The box represents the rank resulting from the combination of protection functions. * Applications 1. Notebook PCs 2. Portable terminals 3. Others MITSUMI Protection of Lithium Ion Battery (three cells in series) MM1309 Pin Assignment 1 2 8 7 6 5 3 4 5 1 2 3 4 6 7 SOP-8C 8 DCHG N. C OV GND BATL BATM BATM VCC Pin Description No. 1 2 3 4 Pin DCHG N. C OV GND BATL BATM BATM VCC Input Input Input Output FET drive pin for overcharge control Negative connection pin for the low side battery. Also, IC GND pin. (IC reference power supply pin) Positive connection pin for the low side battery, and negative connection pin for the middle side battery. Positive connection pin for the middle side battery, and negative connection pin for the high side battery. Positive connection pin for the high side battery. IC positive power supply input pin. Output Function Output FET drive pin for excess discharge control 5 6 7 8 Timing Chart Overcharge Excess discharge BATH VCELL U VCELL O VCELL D VCELL S VCELL U VCELL O VCELL D VCELL S VCELL U VCELL O VCELL D VCELL S H L Normal Unbalanced (large voltage differences) Normal Overcharge Excess discharge Excess discharge Normal Normal Overcharge BATM BATL VALM VALM VALM DCHG OV L High Impedance High Impedance High Impedance MITSUMI Protection of Lithium Ion Battery (three cells in series) MM1309 Block Diagram Output Pin Conditions Pin Overcharge Voltage Excess discharge Normal 4.35V/CELL 2.4V/CELL H L DCHG OV High Impedance L Absolute Maximum Ratings (Ta=25°C) Symbol TSTG TOPR VBAT max. VOC max. VO max. Pd Rating -40~+125 -20~+70 15 15 18 300 Units °C °C V V V mW Item Storage temperature Operating temperature Charging voltage Power supply voltage OV2 pin applied voltage Allowable power dissipation MITSUMI Protection of Lithium Ion Battery (three cells in series) MM1309 Electrical Characteristics (Unless otherwise specified Ta=25°C, VIN=15V, VCELL=VBATH=VBATM=VBATL) Symbol ICC1 ICC2 ICC3 ICC4 IBATH1 IBATH2 IBATH3 VCELLU VCELLO VALM VALM VCELLS VCELLD VCSD IBATL IBATLA IBATM IBATMA ISODCH ISIDCH VTHDCL VTHDCH ISIOV Measurement Conditions VCELL=4.4V VCELL=4.2V VCELL=3.8V VCELL=2.3V VCELL=4.4V VCELL=3.8V VCELL=2.3V Ta=-20~70°C VCELL=4.0V 4.5V VCELL=4.5V VCELL=3.8V VCELL=4.4V VCELL=3.0V VCELL=2.0V 4.0V 4.4V 3.8V 2.0V 3.0V Min Typ. Max. Units 0.7 1.1 mA 300 450 µA 25.0 40.0 µA 0.1 µA 12.0 20.0 µA 8.0 12.0 µA 1.0 2.0 µA 4.35 4.40 V 4.25 4.30 VCELLU VCELLU V -45mV -30mV 4.20 4.25 V 4.10 4.25 90 2.40 2.35 2.65 2.60 250 130 2.49 2.44 2.81 2.76 325 ±300 1.3 ±300 1.3 mV V V mV nA uA nA uA uA uA V V uA Item Current consumption (VCC pin) 1 Current consumption (VCC pin) 2 Current consumption (VCC pin) 3 Current consumption (VCC pin) 4 Current consumption (BATH pin) 1 Current consumption (BATH pin) 2 Current consumption (BATH pin) 3 MM1309BF Charge prohibit voltage MM1309CF Charge prohibit release voltage Charge prohibit detection MM1309BF function operation voltage MM1309CF Charge prohibition sensing operation voltage Hysteresis voltage MM1309BF Excess discharging detection voltage MM1309CF Discharge resumption MM1309BF voltage MM1309CF Excess discharge detection hysteresis voltage BATL pin input voltage 1 BATL pin input voltage 2 BATM pin input voltage 1 BATM pin input voltage 2 DCHG pin source voltage DCHG sink voltage DCHG output voltage L DCHG output voltage M OV pin sink current 4.30 4.20 VCELLU -60mV 4.05 3.95 50 2.31 2.26 2.49 2.44 175 VCELLD-VCELLS VCELL=3.8V VCELL=4.4V VCELL=3.8V VCELL=4.4V VCELL < VCELLS VCELL > VCELLS BATH-DCHG IS=20uA DCHG-GND IS=-20uA VOV=0.4, Ta=-20~70°C 0.7 0.7 20 20 1.0 1.0 1.0 0.8 200 Application