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| MITSUMI Protection of Lithium-Ion Batteries (for Double-Protect) MM1451 Protection of Lithium-Ion Batteries (for Double-Protect) Monolithic IC MM1451 Outline This IC is used for double-protection of lithium-ion batteries with from one to three cells, and has an ultracompact package. Short-circuits between cells accommodate series connections of one to three cells. Features 1. Overcharge detection voltage accuracy (0C to 50C) 2. Consumption current (Vcell=3.8V) 3. Consumption current (Vcell=2.3V) 4. Pin I/O current between cells (Vcell=3.8V) 5. Delay time on overcharge voltage detection (Ct=0.22F) 6. Output current (Vcell=VCC=4.5 V) 50 mV/cell. 3A typ. 0.3A typ. 0.3A max. 1.5S typ. 500A typ. Package VSOP-8B Applications IC for double-protection of lithium-ion batteries with one to three cells. Pin Assignment 1 2 8 7 6 5 3 4 1 2 3 4 5 6 VSOP-8B 7 8 V3 V2 V1 GND Ct N.C OUT VCC MITSUMI Protection of Lithium-Ion Batteries (for Double-Protect) MM1451 Block Diagram MITSUMI Protection of Lithium-Ion Batteries (for Double-Protect) MM1451 Pin Description Pin No. Pin name Functions Equivalent circuit diagram 1 V3 3-cell power supply 2 V2 2-cell power supply 3 V1 1-cell power supply 5 Ct Delay capacity pin 7 OUT OUT pin MITSUMI Protection of Lithium-Ion Batteries (for Double-Protect) MM1451 Absolute Maximun Ratings Item Operating temparature Storage temparature VCC Input voltage V1 Input voltage *1 V2 Input voltage *1 V3 Input voltage *1 Ct pin voltage *2 VOUT pin voltage Allowable loss (Ta=25C) Symbol TOPR TSTG VCC V1 V2 V3 VCT VOUT Pd -0.3~18 -0.3~18 170 V V mW -0.3~18 V Ratings -20~+80 -40~+125 Unit C C Note 1 : 1 18V > V3 > V2 > V1 > -0.3 = = = = Note 2 : 2 Do not impress current of 300A or more on the Ct pin. * * Electrical Characteristics 1 (Except where noted otherwise, Ta=25C, VCEL=V3-V2=V2-V1=V1-GND, VCC=3 Item Current consumption 1 Current consumption 2 Pin I/O current between cells Overcharge detection voltage Hysterisis voltage Overcharge detection delay time Output current Symbol I1 I2 I3 VS Hys TPLH IOH Measurement conditions VCEL=3.8V VCEL=2.3V VCEL=3.8V (between V3, V2, V1) VCEL=L H Ta= - 20~+70C VCEL=L H L Ct=0.22F VCEL=VCC=4.5V VO=3V 35 1.0 100 3.0 0.3 0.0 50 1.5 500 6.0 0.5 0.3 65 2.0 VCEL) Min. Typ. Max. Unit A A A V mV S A 4.400 4.450 4.500 Electrical Characteristics 2 (Except where noted otherwise, Ta=25C, VCEL=V3-V2=V2-V1=V1-GND, VCC=3 Item Current consumption 1 Current consumption 2 Pin I/O current between cells Overcharge detection voltage Hysterisis voltage Overcharge detection delay time Output current Output leakage current Symbol I1 I2 I3 VS Hys TPLH IOH ILEAK Measurement conditions VCEL=3.8V, VCC=VCEL VCEL=2.3V, VCC=VCEL VCEL=L 3 3 3.0 0.3 0.0 35 1.0 100 50 1.5 500 0.1 6.0 0.5 0.3 65 2.0 VCEL) Min. Typ. Max. Unit A A A V mV S A A VCEL=3.8V (between V3, V2, V1) H Ta=-20~+70C H L Ct=0.22F VCEL=VCC=4.6V VO=3V VCEL=3.8V, VCC=18V VCEL=L 4.400 4.450 4.500 MITSUMI Protection of Lithium-Ion Batteries (for Double-Protect) MM1451 Electrical Characteristics 3 (Except where noted otherwise, Ta=25C, VCEL=V3-V2=V2-V1=V1-GND, VCC=3 Item Current consumption 1 Current consumption 2 Current consumption 3 Current consumption 4 Pin I/O current between cells Overcharge detection voltage Hysterisis voltage Overcharge detection delay time Output current Output leakage current Symbol I1 I2 I3 I4 I3 VS Hys TPLH IOH ILEAK Measurement conditions VCEL=3.8V, VCC=VCEL VCEL=3.8V, VCC=VCEL VCEL=2.3V, VCC=VCEL VCEL=2.3V, VCC=VCEL VCEL=L 3 3 3 3 2.5 1.5 0.15 0.1 0.0 35 1.0 100 50 1.5 500 0.1 3.5 2.5 0.3 0.2 0.3 65 2.0 VCEL ) Min. Typ. Max. Unit A A A A A V mV S A A VCEL=3.8V (between V3, V2, V1) H Ta=-20~+70C H L Ct=0.22F VCEL=VCC=4.6V VO=3V VCEL=3.8V, VCC=18V VCEL=L 4.400 4.450 4.500 Measuring Circuit MITSUMI Protection of Lithium-Ion Batteries (for Double-Protect) MM1451 Application Circuit Delay time Td(S) = 7 CCt (F) Note 1: Can support 1, 2 or 3 cells by shorting each cell. However, be sure to connect a battery for V3 cell. V3 cell may not operate correctly when shorted. Note 2: When connecting batteries, be sure to connect in the following order: GND V3, and VCC V1OR V2. Note 3: Output may go ON momentarily when starting up power supply. If this error output during startup becomes a problem, connect the VCC pin last. Note 4: Operation can not be guaranteed for connections other than the above. Timing Chart 4.45V 4.40V V1~V3 Ct 1.8V 0.6V 1.5S OUT OUT (at Ct short) (at Ct open) Note: Output goes low simultaneously with overcharge detection at Ct pin short and open. MITSUMI Protection of Lithium-Ion Batteries (for Double-Protect) MM1451 Characteristics Detection voltage 6 5 Output delay time 3.0 2.5 Output voltage (V) Delay time (S) 4 3 2 1 2.0 2200p pm 2200ppm 1.5 1.0 0.5 -500p pm -500ppm 0 0 1 2 3 4.400 4.450 0.0 -25 25 75 Input voltage (No delay) (V) Temperature (C) Consumption current Consumption current (A) 6 5 4 3 2 1 0 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 Pin I/O current between cells Pin I/O current between cells (A) 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 Cell voltage (V) Cell voltage (V) |
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