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| MITSUMI Protection of Lithium Ion Batteries MM1414 Protection of Lithium Ion Batteries Monolithic IC MM1414 Outline This IC is use to protect lithium-ion batteries consisting of three or four cells. It adopts a compact package and has the functions of previous models, with functions for overcharge detection, overdischarge detection and overcurrent detection. A dead time can be set externally. Features 1. Overcharge detection voltage accuracy 25mV/cell 2. Consumption current (Vcell=4.4V) 50A typ. 3. Consumption current (Vcell=3.5V) 23A typ. 4. Consumption current (Vcell=1.8V) 2A typ. 5. Overcharge sensing dead time: can be set externally 6. PF detection: warning signal when cell voltage falls Package TSOP-20A Applications IC for protection of lithium-ion batteries consisting of three or four cells Pin Assignment 1 2 3 20 19 18 17 16 15 14 13 12 11 4 5 1 2 3 4 5 6 7 8 9 10 TSOP-20A 6 7 8 9 10 OV N.C CS N.C DCHG N.C CDC COL COV GND 11 12 13 14 15 16 17 18 19 20 SEL N.C CON N.C V1 V2 V3 V4 N.C VCC MITSUMI Protection of Lithium Ion Batteries MM1414 Block Diagram MITSUMI Protection of Lithium Ion Batteries MM1414 Pin Description Pin No. Pin name I/O Overcharge detection output pin 1 OV Output NPNTr open collector output Normal: high impedance Overcharge: Low 2 N.C Not connected Overcurrent detection pin Monitors load current equivalently by the voltage drop between discharge control 3 CS Input FET source and drain, and makes DCHG pin high when the voltage goes below overcurrent detection voltage, turning off discharge control FET. After overcurrent detection, current flows from this pin and when there is a light load, overcurrent mode is released. This function does not operate in discharge mode. 4 N.C DCHG N.C CDC COL COV GND SEL N.C CON N.C V1 V2 V3 V4 N.C VCC Input Input Input Input Input Input Input Input Input Input Input Output Not connected Discharge control FET (P-ch) drive pin 5 Normal: Low Overdischarge: High 6 7 Not connected Overdischarge detection dead time setting pin Dead time can be set by connecting a capacitor between CDC pin and ground. Overcurrent detection dead time setting pin Dead time can be set by connecting a capacitor between COL pin and ground. Overcharge detection dead time setting pin Dead time can be set by connecting a capacitor between COV pin and ground. Ground pin 3 cell switch pin Not connected Discharge FET ON/OFF pin 13 CON pin low; DCHG pin low CON pin high; DCHG pin high 14 15 16 17 18 19 20 Not connected V1 cell high side voltage input pin V2 cell high side voltage and V3 cell low side voltage input pin V3 cell high side voltage and V4 cell low side voltage input pin V4 cell high side voltage input pin Not connected Power supply input pin SEL pin = GND: 3 cell (no V1 cell detection) SEL pin = VCC: 4 cell Functions 8 9 10 11 12 MITSUMI Protection of Lithium Ion Batteries MM1414 Pin Description Equivalent circuit diagram Equivalent circuit diagram 1 ; OV 9 ; COV 3 ; CS 11 ; SEL 5 ; DCHG 13 ; CON 7 ; CDC 15 ; V1 8 ; COL 16 ; V2 MITSUMI Protection of Lithium Ion Batteries MM1414 Equivalent circuit diagram Equivalent circuit diagram 17 ; V3 18 ; V4 Absolute Maximum Ratings Item Storage temperature Operating temperature Power supply voltage (Ta=5C) Symbol TSTG TOPR VCC max. VOV max. VSEL max. VCON max. Pd Ratings -40~+125 -20~+70 -0.3~24 -0.3~24 -0.3~24 -0.3~24 300 Unit C C V V V V mW OV pin impressed voltage SEL pin impressed voltage CON pin impressed voltage Allowable loss Recommended Operating Conditions Item Operating temperature Operating voltage Symbol TOPR VOPR Ratings -20~+70 +1.8~+24 Unit C V MITSUMI Protection of Lithium Ion Batteries MM1414 Electrical Characteristics Item Consumption current (VCC pin) 1 Consumption current (VCC pin) 2 Consumption current (VCC pin) 3 Consumption current (VCC pin) 4 Consumption current (VCC pin) 5 Consumption current (V4 pin) 1 Consumption current (V4 pin) 2 Consumption current (V4 pin) 3 V3 pin input current V2 pin input current V1 pin input current Overcharge detection voltage Overcharge hysteresis voltage Overcharge sensing dead time Overdischarge detection voltage Discharge resume voltage Overdischarge hysteresis voltage Overdischarge sensing dead time Overcurrent detection voltage Overcurrent hysteresis voltage Overcurrent sensing dead time 1 Overcurrent sensing dead time 2 Overcurrent sensing dead time 3 Overcurrent reset conditions DCHG pin source current DCHG pin sink current DCHG pin output voltage H DCHG pin output voltage L OV pin sink current OV pin leak current CON pin L voltage CON pin H voltage CON pin current SEL pin L voltage SEL pin H voltage SEL pin current (Except where noted otherwise, Ta=25C, VCC=V4+V3+V2+V1, VCEL=3.5V, CON=0V, SEL=0V) Measurement conditions VCELL=4.4V, CON=0V VCELL=3.5V, CON=0V VCELL=1.8V, CON=0V VCELL=3.5V, CON=VCC VCELL=1.8V, CON=VCC VCELL=4.4V VCELL=3.5V VCELL=1.8V VCELL=3.5V VCELL=3.5V VCELL=3.5V VCELL : 4.2V VCELL : 4.2V 4.4V 4.4V 3.9V A, B C, D A, B C, D Min. Typ. Max. Unit 55 27 2 12 1 10 8 2.5 110 50 4 20 2 20 15 5.0 300 300 300 A, C 4.325 4.350 4.375 B, D 4.225 4.250 4.275 140 0.5 1.90 2.20 2.85 0.75 0.45 0.5 135 5 5 20 20 0.8 0.8 100 0.1 0.4 VCC-0.4 1 VCC-0.4 1 2 2 0.4 200 1.0 2.00 2.30 3.00 1.00 0.70 1.0 150 20 COL=0.001F COL=0.001F, VCC-CS>1.0V COL=0.001F VCELL=1.8V, SW1 : A VDCHG=VCC-0.8V VCELL=3.5V, SW1 : A VDCHG=0.8V VCC-VDCHG, ISO=20A, SW1 : B VDCHG-GND, ISI=-20A, SW1 : B VOV=0.4V, Ta=-20~+70C VOV=24V DCHG= "High" DCHG= "Low" VCELL=3.5V, CON=0.4V for 3 cell for 4 cell VCELL=3.5V, SEL=0.4V 10 1.5 10 260 1.5 2.10 2.40 3.15 1.25 0.95 1.5 165 40 15 3.0 15 V V S mV mV mS mS mS A A V V A A V V A V V A mV S V A A A A A A A A nA nA nA V Symbol ICC1 ICC2 ICC3 ICC4 ICC5 I1V4 I2V4 I3V4 IV3 IV2 IV1 VCELLU VU tOV VCELLS VCELLD VDS tCDC VOC VOC tCOL1 tCOL2 tCOL3 ISODCH ISIDCH VTHDCH VTHDCL ISIOV ILKOV COV=0.1F VCELL : 3.5V 1.8V 3.5V VCELL : 1.8V VCELLD-VCELLS CDC=0.1F VCC-VCS, DCHG Load release conditions 500k MITSUMI Protection of Lithium Ion Batteries MM1414 Measuring Circuit Timing Chart For overcharge Charge OFF Overcharge detection voltage Cell voltage Overcharge release voltage COV pin Sensing dead OV pin (for pull up) Normal state Overcharge Normal state MITSUMI Protection of Lithium Ion Batteries MM1414 For overdischarge Discharge OFF Charge start Discharge resume voltage Cell voltag detection voltage Overdischarge CON pin Sensing dead CDC pin DCHG pin Normal state Normal state Overdischarge Normal state External control Normal state Normal state For overcurrent Overcurrent Load release Current flows from CS pin CS pin COL pin Sensing dead Reset dead DCHG pin Normal state Overcurrent Normal state MITSUMI Protection of Lithium Ion Batteries MM1414 Application Circuit Characteristics Overcharge & Overdischarge Sensing Dead Times 10 Overcurrent Sensing Dead Time 1, Overcurrent Reset Dead Time 100 1 Dead time (mS) 0.01 0.1 1 Dead time (S) 10 0.1 0.01 0.001 1 100 1000 10000 Pin capacitance (F) COL pin capacitance (pF) Overcurrent Sensing Dead Time 2 100 Overcurrent Sensing Dead Time 2 (mS) 10 1 0 100 1000 10000 COL pin capacitance (pF) Note: The above characteristics are representative values only, and are not guaranteed. |
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