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| MITSUMI Protection of Lithium Ion Batteries (one cell) MM1301 Protection of Lithium Ion Batteries (one cell) Monolithic IC MM1301 Outline This IC provides protection for the MM1291 series of compact, high-precision type lithium ion batteries which have been in use for some time. Precision of 30mV is guaranteed between 0C and +50C, and this IC can be used in applications where precision is crucial. 1-Cell Protection ICs Overcharge Overdischarge Release Overcurrent detection detection Hysteresis Dead time Delay detection voltage SOP-8 VSOP-8 voltage Overcurrent Detec time shot-mode MM1301 AW 4.27V 200mV at 2.3V 2.9V 100mV 0.9V BW 4.17V 100mV Ctd= 2.3V 2.9V 100mV 0.9V min. 5mS 125mV min. 5mS 0.45V CW 4.18V 100mV 0.082F 2.3V 2.9V DW 4.28V 220mV 2.3V 2.9V 50mV 0.45V EF 4.20V 100mV min. 0.5S 2.3V 2.9V typ. 10mS 125mV typ. 10mS 0.45V FW 4.28V 100mV 2.3V 2.9V 50mV 0.45V GW 4.18V 220mV typ. 1S 2.3V 2.9V max. 15mS 125mV max. 15mS 0.45V HW 4.35V 220mV 2.3V 2.9V 50mV 0.45V JW 4.20V 220mV max. 1.5S 2.3V 2.9V 125mV 0.45V Note : Under open-load conditions, returns to normal mode from overcurrent mode. (For MM1291A to G, J, M, 5M or higher; for MM1291H, K, 50M or higher) Package Features 1 Overcharge detection voltage Ta=0~+50C VCEL30mV 1.0S typ. 2 Overcharge detection delay time CTD=0.082F 10A typ. 3 Current consumption (normal operation VCEL=3.5V) 0.7A typ. 4 Current consumption (overdischarge operation VCEL=1.9V) 5 Overcurrent cancel conditions Load removed : Load of 5M or greater across battery pack terminals Package VSOP-8A Applications Lithium ion battery pack (for battery protection) MITSUMI Protection of Lithium Ion Batteries (one cell) MM1301 Block Diagram Pin Assignment 1 2 8 7 6 5 3 4 1 2 3 4 5 6 VSOP-8A 7 8 GND GD CS OC N.C TD VCC VIN Pin Description Pin No. Pin name 1 GND Negative power supply pin Also serves as voltage detection pin for battery connected between VIN and GND Gate connection pin for discharge-control FET (N-ch) 2 GD Turns the gate off in overdischarge mode and overcurrent mode. Gate is turned on in overcharge and normal modes. Overcurrent detection input pin 3 CS Discharge current detected by connection to drain pin of discharge-control FET. Discharge current = (CS-GND voltage)/(FET turn-on resistance) Function MITSUMI Protection of Lithium Ion Batteries (one cell) MM1301 4 5 6 7 8 OC N.C TD VCC VIN Overcharge detection output pin On overcharge, an external transistor is driven to turn off the charge-control FET (N-ch) Overcharge detection dead time setting pin Positive power supply voltage pin Voltage detection pin for battery connected between VIN and GND Notes : Overcharge mode : Battery voltage > overcharge detection voltage Normal mode : Overdischarge detection voltage < battery voltage < overcharge detection voltage, discharge current < overcurrent detection level Overdischarge mode : Overdischarge detection voltage > battery voltage Overcurrent mode : Discharge current > overdischarge detection level=CS-GND voltage > discharge current turn-on resistance (discharge-control FET) Absolute Maximun Ratings Item Storage temperature Operating temperature Power supply voltage OC pin voltage CS pin voltage Allowable loss (Ta=25C) Symbol TSTG TOPR VCC max. VOC max. VCS max. Pd Ratings -40~+125 -20~+70 -0.3~+18 -0.6~VCC 300 Units C C V V mW Recommended Operating Conditions Item Operating temperature Operating voltage Symbol TOPR VOP Ratings -20~+70 +0.9~+18 Units C V Electrical Characteristics Item Overcharge detection voltage Overcharge release voltage Overcharge sensing hysteresis VOCH=VOC-VOCR (Except where noted otherwise, Ta=25C) Symbol VOC VOCR VOCH VODC1 VODR VCS VCSS VCC=VIN=H L VCC=VIN=L H VCS=L H Measurement conditions VCC=VIN=L H, Ta=0~50C VCC=VIN=H L Min. Typ. Max. Units 4.15 4.04 60 2.20 2.78 112 0.35 4.18 4.09 90 2.30 2.90 125 0.45 4.21 4.14 120 2.40 3.02 138 0.55 V V mV V V mV V Overdischarge detection voltage Overdischarge release voltage Overcurrent detection threshold Overcurrent short-circuit detection Overcurrent release conditions Consumption current 1 (Normal mode) (IS1=ICC+IIN) Consumption current 2 (Overdischarge mode) Load open : Load of 5M or greater across battery pack terminals IS1 IS2 VCC=VIN=3.5V VCC=VIN=1.9V 10.0 0.7 14.0 1.0 A A MITSUMI Protection of Lithium Ion Batteries (one cell) MM1301 Overcurrent detection delay time 1 Overcurrent detection delay time 2 Overdischarge detection delay time Overcharge detection delay time OC pin output current GD pin "H" Output voltage (Normal mode) GD pin "L" Output voltage (Overcurrent mode) GD pin "L" Output voltage (Overdischarge mode) tCS1 tCS2 tOD tOC IOC VGDH VGDL1 VGDL2 CTD=0.082F 5.0 10.0 30 10.0 1.0 VCC -0.1 0.1 0.2 15.0 100 15.0 1.5 -30 mS S mS S A V *1 5.0 *2 0.5 VCC -0.3 VCC=VIN=4.5V VCC=VIN=3.5V VCC=VIN=3.5V VCS=0.5V VCC=VIN=1.5V 0.3 0.4 V V *1: The overcurrent short mode delay time (overcurrent delay time 2) is the response time of the IC itself. In actual use, the time required for discharge of the gate capacitance of the discharge-controlling FET is added to this. When excessive currents cause considerable voltage fluctuation, the bias current within the IC may be temporarily turned off, so that the response time is lengthened. The time constant of the capacitance and resistance connected to the power supply pin should be set to at least 100S/V, to limit power supply fluctuations. Use the following formula to calculate the overcharge detection time: overcharge detection dead time tOC = 12.2 CTD [S] [where CTD is the external capacitance in F] *2: Timing Chart Overcharge cutoff voltage Overcharge expulsion voltage Cell voltage Overdischarge expulsion voltage TD FET gate (charge control) Overdischarge cutoff voltage FET gate (discharge control) removing load Normal mode Normal mode Normal mode Overcharge mode Overcurrent MITSUMI Protection of Lithium Ion Batteries (one cell) MM1301 Application circuits Characteristics Power supply current vs power supply voltage Power supply current (ICC, IIN) (A) 50 Overcharge detection time Overcharge detection time (S) 10 40 1 30 20 ICC IIN 0 1.0 2.0 3.0 4.0 5.0 0.1 10 0.01 0.001 0.01 0.1 External capacitance (CTD) (F) Power supply voltage (ICC, VIN) (V) |
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