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| MITSUMI Protection of Lithium Ion Batteries (two cells in series) MM1292, 1302 Protection of Lithium Ion Batteries (two cells in series) Monolithic IC MM1292, 1302 Outline This IC is for protecting a lithium ion battery from overcharging, excess discharging, and overcurrent. If abnormalities occur during charging and excess voltage is applied, it has a function that turns off the external FET switch when voltage is applied to each battery beyond a specified time (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. Also, when there is a large current flow due to shorting or other reasons, there is a function for turning off the external FET switch (overcurrent detection). These functions comprise a protection circuit, with few external parts, for lithium ion batteries. Temperature conditions A: Ta=-25 ~ 75C, B: Ta=-20 ~ 70C, C: Ta=0 ~ 50C, D: Ta=0 ~ 40C, E: Ta=-20 ~ 25C Series Table Model Overcharge Overcharge Overdischarge Overdischarge Overcurrent Overcharge detection voltage detection detection reset detection detection temperature hysteresis voltage (V) voltage (V) voltage (mV) SOP-8D SOP-8C, 8E voltage (V) conditions voltage (V) Package CF DF HF 4.2500.050 4.3500.050 4.3000.050 4.3500.050 KF LF NF AF EF FF GF 4.2500.050 4.2500.050 4.3500.050 4.2500.050 4.1000.050 4.3500.050 4.2150.035 B B B B B B B B D E D 2.300.10 3.000.10 22020 20060 20060 22050 22050 22050 22060 22060 2.400.10 2.400.10 2.050.10 2.050.10 2.400.10 2.400.10 2.200.10 2.300.10 2.400.10 3.000.10 3.000.10 3.000.10 3.000.10 3.000.10 3.000.10 3.000.10 3.000.10 3.000.10 15020 15020 17015 17012 15015 10010 10010 22020 15015 MM1292 MF MM1302 Features 1. 2. 3. 4. 5. 6. 7. 8. Current consumption (during overcharging) Current consumption (normal) Current consumption (during excess discharging) Current consumption (during excess discharging) Overcharge detection voltage Discharge resumption voltage Reset after overcurrent detection Operating limit voltage VCELL=4.5V 80A typ. VCELL=3.5V 13A typ. VCELL=1.9V 0.5A typ. VCELL=1.0V 0.1A max. VCELL50mV (detection for each cell) 3.0V0.1V (detection for each cell) load release 0.9V max. Package SOP-8C, SOP-8D, SOP-8E (MM1292 F) The box represents the rank resulting from the combination of protection functions. * MITSUMI Protection of Lithium Ion Batteries (two cells in series) MM1292, 1302 Applications 1. Cellular phones 2. Movies Pin Assignment 1 2 8 7 6 5 3 4 5 1 2 3 4 6 7 SOP-8C/SOP-8D 8 OC GD N.C GND TD VL CS VH Pin Description Pin No. Pin Output Function Output pin for control of the charging control FET. When voltage detected between VH-VL or VL-GND goes over overcharge detection voltage (VALM), the output PNP1 OC Output TR (open collector output) is switched ON, and charging is prohibited by activating the element (NPN-TR, or N-ch FET) that switches the charging control FET to OFF. This operation continues until the voltage falls below VALM. Output pin for driving the discharge control FET. When voltage detected between VH2 GD Output VL and VL-GND goes over excess discharge voltage (VS), this pin goes H. When voltage detected between VH-VL and VL-GND falls below VS and the voltage between CS-GND is more than the voltage detected for an overcurrent (VCS), it goes L. 3 4 N.C GND Input Non connected Negative connection pin for the low side battery. It is also the ground pin for this IC. (The IC's reference power supply pin.) Over charge detection output non-induction time setting pin. The capacitor connected 5 TD Input between TD-GND is charged with constant current (ITC) during over charging. When TC pin voltage exceeds the threshold value (VTC), OC output is switched ON. 6 VL Input Positive connection pin for the low side battery, and negative connection pin for the high side battery. Overcurrent detection pin during discharge, and charging detection pin during power down. It detects discharge current using the source drain voltage (voltage 7 CS Input between CS-GND) of discharge control FET. Also, when the battery is charged with a current whose CS-GND voltage after power down exceeds the start-up voltage (VST), the bias current is drained to the interior circuit and operating status results. 8 VH Input Positive connection pin for the high side battery, and the IC's current input pin. MITSUMI Protection of Lithium Ion Batteries (two cells in series) MM1292, 1302 Block Diagram Note 1. 45A max. (current consumption during operation of overcharge detection section) flows to input protection resistor R1. Note 2. 0.3A max. (when cells are balanced) flows to input protection resistor R2. When the cells are not balanced, the current increases to wards correction. Note 3: GD pin output is OR processed when H cell and L cell fall to VS or below from higher than VS. < > GD pin output is < > AND processed when H cell and L cell rise to VS or higher from below VS. tOP Operating interval t1 tST waiting interval Data intake prohibition interval Data intake prohibition interval t2 30A Current consumption 5A tOP tST Current consumption Average current Time Timing for setting non-induction time VCELL>4.25V Data processing VCELL<4.25V section Reset Non-induction time Overcharging identification VH GC VCS (battery-) MITSUMI Protection of Lithium Ion Batteries (two cells in series) MM1292, 1302 Timing Chart VALM VALM VALM VS VALM VALM VS Discharging state AND process OR processing VH VS VL VS Discharging GD prohibited Start-up signal generation timing operation starts operation stop Overcharging detection output Hold untill t (N+1) Overcharging identification Data latch TD OC unsettled (High impedance) Charging prohibited, constant current output (source current) unsettled Current consumption Absolute Maximum Ratings Item Storage temperature Operating temperature Power supply voltage OC pin applied voltage CS pin applied voltage Allowable power dissipation Symbol TSTG TOPR VOC max. VOVOUT VDCOUT Pd Rating -40~+125 -20~+70 -0.3~18 -10~VH -0.6~VH 300 Units C C V V V mA MITSUMI Protection of Lithium Ion Batteries (two cells in series) MM1292, 1302 Electrical Characteristics Item Current consumption 1 Current consumption 2 Current consumption 3 Current consumption 4 VL pin input voltage Overcurrent detection voltage Hysteresis voltage Overcharge detection voltage Discharge resumption voltage Starting voltage GD pin output voltage H GD pin output voltage L OC pin output current Overcurrent detection voltage Reset by overcurrent Overcurrent detection delay 1 Overcurrent detection delay 2 Excess discharge detection delay TC pin charge current TC pin threshold value Non-induction time for overcharge Operating limit voltage (unless otherwise specified, Ta=25C) Models listed MM1292CF Symbol IVH1 IVH2 IVH3 IVH4 IVL VALM VAL VS VDF VST VGDH VGDL IOCH VCS TOC1 TOC2 TOD ITC1 VTC TOC VOPL Measurement Conditions Min. Typ. Max. Units VCELL=4.5V, ROC=270k 80 100 A VCELL=3.5V (normal) 13.0 20.0 A VCELL=1.9V (During excess discharge) 0.5 0.8 A VCELL=1.0V (During excess discharge) 0.1 A VH=VL -0.3 0 0.3 A Ta=-20C~70C 4.20 4.25 4.30 V VAL=VALMH-VALML 140 200 260 mV 2.30 2.40 2.50 V Discharge resumed through voltage rise 2.90 3.00 3.10 V Voltage applied between GND-CS pins -0.6 -0.5 V VCELL=3.5V, IL=10A VH-0.3 VH-0.2 V VCELL=3.5V, IL=10A, VCS=1V 0.2 0.3 V VCELL=4.5V 20 150 A 135 150 165 mV load release 10 20 ms between CS-GND pins > 0.8V 30 100 s 10 20 ms 30 50 80 nA VCELL=4.5V, VTC=0 5V 3.65 3.90 4.15 V VOC=L H CTC=0.012F 0.5 1.0 1.5 s 0.9 V Note 1. For current consumption, it is assumed that high side cell voltage and low side cell voltage are identical. When the cell voltages differ, it is set by the higher voltage. 2. GD pin are high impedance when the current consumption is below the operating limit voltage. 3. When the circuit configuration calls for discharge resumption through charging, the discharge resumption voltage is 2.4V typ. Description of Operation [Outline] This IC is used for protecting lithium ion batteries (two cell series connection type). Overcharge detection, excess discharge detection, and overcurrent detection are built into each circuit. It controls the FET for discharge control and charge control (external N-MOS FET). There are four major operating modes. 1. Overcharge mode When the voltage between Vh-VI and VI-GND exceeds the overcharge voltage (VALM). 2. Normal mode When the voltage between Vh-VI and VI-GND exceeds the excess discharge voltage (VS) and is less than the over charge voltage (VALM). 3. Excess discharge mode When the voltage between Vh-VI and VI-GND is less than the excess discharge voltage (VS). 4. Overcurrent mode When the voltage between CS-GND is less than the overcurrent voltage (VCS). MITSUMI [Operation] 1. Excess discharge detection circuit Protection of Lithium Ion Batteries (two cells in series) MM1292, 1302 The H cell excess discharge detection circuit monitors the voltage between VH-VL, while the L cell excess discharge detection circuit monitors the voltage between VL-GND. When the voltage between VH-VL and VLGND exceeds VS, the operating state is maintained with bias current supplied from the bias circuit to the delay circuit, the output control circuit, the overcurrent detection circuit, and the overcharge detection circuit. When the battery current for either the H or L cell falls below VS, the current from the excess discharge detection circuit to the bias circuit is switched off. Also, the capacitor connected to the delay circuit's comparator (COD) input pin is charged using constant current. When this falls below the COD's reference input potential, the bias current to output control and current to the bias circuit are switched off. The excess discharge delay time (TOD) is set by the delay circuit and cannot be modified externally. When the bias circuit is in waiting mode, the hysteresis loop to the excess discharge detection circuit is switched off, and the detection voltage of the excess discharge detection circuit becomes discharge resumption voltage (VDF). When the battery is being charged and the voltage between CS-GND during excess discharge mode falls below VST, however, start-up current is supplied to the bias circuit, and the hysteresis loop of the excess discharge detection circuit is connected. Therefore, the excess discharge detection circuit detection voltage becomes VS. Also, the overcharging detection circuit goes into waiting mode, so overcharging detection does not occur in overcharging mode. When the cell voltage of either the H or L cell exceeds VALM (one is excess discharging and the other is overcharging), the bias current is maintained in the overcharging detection circuit. Therefore, the overcharging is maintained until the current falls below VALM. 2. Overcharging Detection Circuit The timing (clock) for the waiting interval and operating interval is created by the timing generation circuit. In normal mode, the only blocks operating during the waiting interval are the input stages for the timing generation circuit and the data intake section. Other blocks operate only during the operation interval. The operation interval and the waiting interval are set at a ratio of 1:10, reducing power consumption. The voltage detection resistance of the overcharge detection circuit is switched on and off by the detection section's SW circuit. Therefore, current does not flow to detection resistors during waiting time, resulting in low current consumption during excess discharge mode. (Related operations) Bias current is supplied to the timing generation circuit and data intake section by the bias circuit of the excess discharge detection section during normal mode. The operation interval and the waiting interval are created by the timing generation circuit. During the operation interval, bias current is supplied to the excess charging detection circuit, and cell voltages of both the H and L cells are monitored. MITSUMI Protection of Lithium Ion Batteries (two cells in series) MM1292, 1302 When the cell voltage of either the H or L cell exceeds VALM, an overcharge detection signal is output to the data intake section, and a reset signal is prohibited from going to the data processing section. When more than two consecutive clocks of the excess charging detection signal are input to the data intake section, a determination is made that the overcharging detection signal has been properly input, and it is output to the next stage. This prevents noise and mistaken determinations of overcharging caused by excess cell voltage fluctuation. When the date intake section outputs the overcharging detection signal, the data charge section goes into operation. When more than two clocks of overcharging signals are input, this activates the latch on the overcharging signal. When the overcharging signal latch in the date latch section is activated, the next non-induction time circuit goes into operation. When this operates, the TD pin is charged by constant current (ITC). The TD pin potential and the threshold value (VTC) are compared by the non-induction time circuit comparator. When TD pin voltage exceeds VTC, the OC pin output stage becomes operable and OC pin output PNP-TR (open collector) is switched on. Also, bias current is supplied to the timing generation circuit and the operation of the overcharging detection circuit is maintained. When discharge occurs during overcharge mode (GND < DS pin), the discharge detection circuit charges the TD pin and non-induction time is reset. When cell voltage falls below VALM and the overcharging detection circuit signal is off, the reset prohibition is lifted. The reset signal is sent to the data intake and data latch sections and the non-induction time circuit, and normal mode is reinstated. A diode is built in between the OC pin and GND. When OC pin potential falls below GND terminal VF, current flows from the OC pin. Therefore, when battery pack voltage < |
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