MITSUMI Control of Lithium Ion Battery Charging and Discharging MM1214 Control of Lithium Ion Battery Charging and Discharging Monolithic IC MM1214 Outline This IC controls constant current charging and excess discharge for lithium-ion batteries (sub-batteries). It performs constant current charging, stops charging at set voltages, and prevents excess discharging. When the voltage falls below a set level, it prohibits discharges and reduces IC current consumption nearly to zero. Features During charging 1. Input voltage range 2. Current consumption (VIN pin) 3. Current consumption (VCC pin) 4. Charging current switching voltage 5. Charging current (normal conditions) 6. Charging current (low voltages) 7. Charging control voltage (Ta =-20~+70°C) 8. Overvoltage detection voltage (Ta =-20~+70°C) 9. Overvoltage reset voltage 10.Overvoltage detection non-induction time 11.Overvoltage reset non-induction time VBATT<4.1V IBATC=0mA CCC=2.22µF CCC=0.22µF During discharging 12.Current consumption (Vbat pin) IL=10mA 13.Current consumption (Vbat pin) IL=0mA 14.Current consumption (Vbat pin) discharging off, : VBAT<2.4V 15.Excess discharging detection voltage 16.Discharge resumption voltage 17.Voltage drop between battery and output (VBATT=3.0V, IL=-10mA) 18.Voltage drop between battery and output (IL=100µA, VBATT=3V) Package SSOP-16A (MM1214XF) Application For overnight charging 4.5V~15.0V 9mA typ. 500µA typ. 2.7V±0.1V 105mA typ. 5.0mA typ. 4.200V±0.063V 4.335V±0.065V 3.50V±0.13V 0.80S typ. 0.80S typ. 450µA typ. 15µA typ. 0.1µA max. 2.30V±0.19V 2.70V±0.1V 70mV typ. 2.92V typ. Control of Lithium Ion Battery Charging and Discharging MM1214 MITSUMI Pin Assignment 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 SSOP-16A 1 GND 9 VO2 2 N.C 10 VO1 3 TCH 11 VBAT 4 CD 12 N.C 5 N.C 13 VIN 6 N.C 14 N.C 7 N.C 15 VCC 8 VOV 16 N.C Block Diagram Absolute Maximum Ratings Item Storage temperature Operating temperature input voltage Power supply voltage Battery voltage VOV pin applied voltage TCH pin applied voltage Charging current Output current Allowable power dissipation 1 Allowable power dissipation 2 (Note 1) Symbol TSTG TOPR VINN max. VCC max. VBAT max. VVOV max. VTCH max. ICHG max. IBAT max. Pd1 Pd2 Note 1 : When mounted on glass epoxy board (10 Rating -40~+125 -20~+70 18 18 4.4 10 10 -150 -30 500 1000 25 Units °C °C V V V V V mA mA mW mW 0.8) Plated area 80% (Refer to Fig.1) Control of Lithium Ion Battery Charging and Discharging MM1214 MITSUMI Electrical Characteristics (Unless otherwise specified Ta=25°C, VCC, VIN=6.5V) Item Symbol Measurement Conditions Charging input operation range 1 VINOPR1 During low-current charging (Note 2) 4.50 (15.0) V Charging input operation range 2 VINOPR2 During rapid charge 4.50 5.5 V Power supply input operation range VCCOPR Charging OFF 4.50 15.0 V Current consumption (VIN pin) IIN VBAT < 4.1V 9 12 mA Current consumption (VCC pin) ICC IBATC=0mA 500 750 µA Current consumption (VBAT pin) 1 IBAT1 IL=10mA, VCC=0V, VBATT=3V 450 550 µA Current consumption (VBAT pin) 2 IBAT2 IL=0mA, VCC=0V, VBATT=3V 15 30 µA Current consumption (VBAT pin) 3 IBAT3 VBAT < 2.4V (Discharging OFF), VCC=0V 0.1 µA Charge control voltage VBATC Ta=-20~+70°C 4.137 4.200 4.263 V Overcharge detection voltage VBATU Ta=-20~+70°C 4.270 4.335 4.400 V Overcharge reset voltage VBATO 3.37 3.50 3.63 V 100 135 Detection voltage margin 1 Charge current conversion voltage Charge hysteresis voltage VUC VCH VCH VBATT=4.5V 3.0V VBATU-VBATC, Ta=-20~+70°C Min. Typ. Max. Units mV VBATT=2.0V 3.0V 2.60 2.70 2.80 V VBATT=3.0V 2.0V 300 400 500 mV Charge current (During low voltage) ITCH VBATT < VCH- VCH -6.5 -5.0 -3.5 mA Charge current (Normal) IBATC1 4.0V > VBAT > VCH -115 -105 -95 mA Charge current 1 (Normal) IBAT1CT Ta=-20~+70°C, VIN=4.5V~5.5V -120 -105 -90 mA Charge current 2 (Normal) IBAT2CT Ta=-20~+70°C, VIN=4.5V~6.5V -125 -105 -90 mA Charge with constant current mode OFF IBATC2 VBAT=4.0V -115 -80 mA Excess discharging detection voltage VBATS Discharge resumption voltage VBATD VCC > 4.5V Voltage drop between battery and output VCE VBAT=3.0V, IL=10mA VOV pin sink current ISIVOV VBATT=4.4V, VVOV=0.4V VOV pin leak current ILVOV VBAT=4.0V VOV pin output voltage VVOV IVOV=1mA TCH pin sink current ISITCH VBAT=2.0V, VTCH=0.4V TCH pin leak current ILTCH VBAT=3.0V TCH pin output voltage VTCH ITCH=1mA 0.25 CD pin charge current ICDC CD pin discharge current VBATT=3.0V 2.0V 2.11 2.30 2.49 V 2.60 2.70 2.80 V 70 100 mV 1.00 4.00 0.25 1.00 mA 0.1 µA 0.35 V 4.00 mA 0.1 µA 0.35 V VCD=1.5V, VBAT=4.4V -800 -600 -400 nA ICDDC VCD=1.5V, VBAT=3.0V 500 680 860 nA CD pin H voltage VCDH VBATT=4.5V 2.65 2.90 3.15 V CD pin threshold voltage 1 VTHC1 VCD=3V 0V 0.65 0.73 0.91 V CD pin threshold voltage 2 VTHC2 VCD=0V 3V 2.00 2.35 2.70 V Overvoltage detection non-induction time tDCD1 CCD=0.22µF 0.40 0.80 1.60 S Overvoltage reset non-induction time tDCD2 CCD=0.22µF 0.40 0.80 1.60 S Note 2 : During rapid charging, use 5.5 V Vin power supply. Note 3 : VO2 has no current supply capacity, so do not connect load. Control of Lithium Ion Battery Charging and Discharging MM1214 MITSUMI Charcteristics PD [mW] When mounted on glass epoxy base (10 1200 Prated area 80% 1000 800 600 SSOP-16A 400 200 25 50 70 TEMP [°C] Fig.1 Application Circuits 100 125 25 0.8 [mm])