Protection of Lithium Ion Batteries (one cell) MM1291 MITSUMI Protection of Lithium Ion Batteries (one cell) Monolithic IC MM1291 Outline This is a protection IC for one-cell series that protects lithium ion batteries during excess charging, discharging, or 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 functions for turning off the external FET switch (overcurrent detection). These function comprise a protection circuit, with few external parts, for lithium ion batteries. 1-Cell Protection ICs Overcharge detection SOP-8 VSOP-8 voltage MM1291AF AW 4.35V BF BW 4.25V CF 4.10V DF 4.35V EF 4.35V GF 4.225V HF HW 4.35V JW 4.25V KF 4.25V MW 4.30V Package Hysteresis Dead time 200mV 200mV 25mV 25mV 27mV 27mV 200mV 270mV 200mV 270mV at Ctd= 0.082µF min. 0.5S typ. 1S max. 1.5S Overdischarge Release detection voltage * * * * * * * 2.6V 2.4V 2.6V 2.4V 2.6V 2.4V 2.6V 2.4V 2.6V 2.4V 2.6V 2.4V 2.6V 2.4V 2.3V 2.3V 2.3V 2.9V 2.9V 2.9V 2.9V 2.9V 2.9V 2.9V 2.9V 2.9V 2.9V Delay Overcurrent detection Overcurrent 100mV 100mV 150mV min. 5mS 100mV 100mV typ. 10mS 100mV 50mV max. 15mS 125mV 50mV 125mV Note : Under open-load conditions, returns to normal mode from overcurrent mode. (For MM1291A to G, J, M, 5MΩ or higher; for MM1291H, K, 50MΩ or higher) Detec time shot-mode No No No min. 5mS No No typ. 10mS No 0.45V max. 15mS 0.45V 0.9V 0.45V MITSUMI Protection of Lithium Ion Batteries (one cell) MM1291 Features 1. 2. 3. 4. 5. Current consumption (during overcharging) Current consumption (normal) Current consumption (during excess discharge) Consumption current (during excess discharge) Overcharge detection voltage (Ta=-20°C~+70°C) VCC=4.5V VCC=3.5V VCC=1.9V VCC=1.0V 6. Overcharge detection hysteresis 7. Overcharge non-induction time 8. Excess discharge voltage 1 9. Excess discharge voltage 2 10.Excess discharge reset voltage 11.Excess discharge during non-induction 12.Overcurrent detection voltage 13.Reset after overcurrent detection 14.Overcurrent detection non-induction time CTD=0.082µF VCS=0V VCS=0.05V VCC pin 40µA typ. VCC pin 7µA typ. 0.7µA typ. 0.17µA max. A 4.35V±50mV B 4.25V±50mV C 4.10V±50mV A 200mV typ. B 200mV typ. C 27mV typ. 1S typ. 2.6V±0.1V 2.4V±0.1V 2.9V±0.12V 10mS typ. A 100mV±10mV B 100mV±10mV C 150mV±15mV load release 10mS typ. Package SOP-8C, SOP-8D (MM1291 F) VSOP-8A (MM1291 W) The box represents the rank resulting from the combination of protection functions. * Applications 1. 2. 3. 4. Cellular phones PHS MD others VIN pin 3µA typ. VIN pin 2µA typ. Protection of Lithium Ion Batteries (one cell) MM1291 MITSUMI Pin Assignment 8 1 7 2 6 3 5 4 SOP-8C/SOP-8D 1 GND 2 GD 3 CS 4 OC 5 CE 6 TD 7 VCC 8 VIN Pin Description Pin NO. NAME I/O 1 GND Input Description Negative power supply for this IC. Also acts as detection pin for the battery connected between VIN-GND. Nch-FET gate connection pin for discharge control. Switches gate OFF when 2 GD Output excess discharge is detected, and for current protection. Switches gate ON when excess discharge is detected in normal state. Detection pin for voltage between CS-GND. Detects excess discharge using Nch- 3 CS Input FET (discharge control) ON resistor and discharge current. Control pin for Nch-FET for charge control. Switches FET off by activating an 4 OC Output external transistor when excess charging is detected. 5 N.C 6 TD This pin sets non-induction time for overcharge detection. It charges the capacitor Input connected between TD-GND with a fixed current during overcharging. 7 VCC Input Positive power supply pin for the IC. 8 VIN Input Detection pin for the battery connected between VIN-GND. Protection of Lithium Ion Batteries (one cell) MM1291 MITSUMI Block Diagram VS indicates average values. VALML is low due to the effect of R1 linked to the VIN pin. *1 A : 4.150V B : 4.050V C : 4.073V *2 A : 4.350V B : 4.250V C : 4.100V *3 A : 0.10V B : 0.10V C : 0.15V Timing Chart Charge Excess Normal discharge VIN (VCC) Excess Normal Excess discharge Charge Charge Charge Overcurrent protection Overcurrent protection Excess Normal discharge Normal Normal Normal Excess discharge VALM VALML VDF VS1 0V Load release unsettled Load release Load release 1 1.0V * CS 0V VCS VST GD 0V TD 0V OC 0V unsettled TOO TALM *1 C only TOC1 TOD TOC2 TOC2 Protection of Lithium Ion Batteries (one cell) MM1291 MITSUMI MM1291AFBE Absolute Maximum Ratings (Ta=25°C) Item Storage temperature Operating temperature Power supply voltage VCC-OC pin voltage CS pin voltage Allowable loss Symbol TSTG TOPR VCC VOC VCS PD Rating -40~+125 -20~+70 -0.3~+18 -18~0 -0.6~VCC 300 Units °C °C V V V mV * The CS pin will not cause abnormal operation when connected to protection resistor R Electrical Characteristics (=4.7kΩ) (Unless otherwise specified Ta=25°C, VCC=VIN=3.5V, VCS=0V, Measurement circuit 1, SW1 : a) Item 1 (Normal mode) (IS1=ICC+IIN) Consumption current 2 (Overdischarge mode) Symbol ICC1 IOP2 Overcharge detection voltage VALM Overcharge reset voltage VALML Overcharge hysteresis voltage VALM Excess discharge detection voltage 1 VS1 Excess discharge detection voltage 2 VS2 Excess discharge reset voltage VODR Starting voltage VST Overcurrent detection voltage VCS Overcurrent protection release Excess discharge detection non-induction time Excessive current detection during non-induction time *1 *2 CS Measurement Conditions VCC=VIN=3.5V VCC=VIN=1.9V Ta=-20°C~70°C VCC=VIN=4.0V 4.5V VOC : L H VCC=VIN=4.5V 4.0V VOC : H L VOC-VOCR VCC=VIN=3.1V 2.0V VGD : H L, VCS=0V VCC=VIN=3.1V 2.0V VCS=0.05V, VGD : H L VCC=VIN=2.0V 3.1V VGD : L H VCC=VIN=2.75V VCS=0V -0.5V, VGD : L H VCS=0V 0.12V VGD : H L Min. Typ. Max. Units 8.0 11.0 µA 0.7 1.0 µA 4.300 4.350 4.400 V 4.050 4.150 4.240 V 150 200 250 mV 2.50 2.60 2.70 V 2.30 2.40 2.50 V 2.78 2.90 3.02 V -0.3 -0.1 90 100 V 110 mV load release (more than 5 MEG) tOD tOC1 VCC=VIN=3.0V 2.4V, 1 measurement circuit 2, SW1 : b, SW2 : a VCS=0V VCS, 1 measurement circuit 2, SW1 : a, SW2 : b VCC=VIN=4.0V 4.5V, 1 measurement circuit 2, SW1 : b, SW2 : a CTD=0.082µF VCC When VGDL2 > 0.4V * * * Overcurrent non-induction time tALM Operating limit voltage 2 * VOP GD pin output voltage H VGDH VCC=VIN=3.5V GD pin output voltage L1 GD pin output voltage L2 OC pin output current VGDL1 VGDL2 IOC VCC=VIN=3.5V, VCS=0.5V VCC=VIN=1.5V VCC=VIN=4.5V, SW1 : b Refer to input waveforms. Operation is unstable below the operating limit voltage. 5.0 10.0 15.0 mS 5.0 10.0 15.0 mS 0.5 1.0 1.5 S 1.2 V VCC -0.3 VCC -0.1 0.1 0.2 V 0.3 0.4 -30 V V uA Protection of Lithium Ion Batteries (one cell) MM1291 MITSUMI MM1291BFBE Absolute Maximum Ratings (Ta=25°C) Item Storage temperature Operating temperature Power supply voltage VCC-OC pin voltage CS pin voltage Allowable loss Symbol TSTG TOPR VCC VOC VCS PD Rating -40~+125 -20~+70 -0.3~+18 -18~0 -0.6~VCC 300 Units °C °C V V V mV *The CS pin will not cause abnormal operation when connected to protection resistor R CS Electrical Characteristics (Unless otherwise specified Ta=25°C, VCC=VIN=3.5V, VCS=0V, Measurement circuit 1, SW1 : a) Item 1 (Normal mode) (IS1=ICC+IIN) Consumption current 2 (Overdischarge mode) Symbol ICC1 IOP2 Overcharge detection voltage VALM Overcharge reset voltage VALML Overcharge hysteresis voltage VOCH Excess discharge detection voltage 1 VS1 Excess discharge detection voltage 2 VS2 Excess discharge reset voltage VDF Starting voltage VST Overcurrent detection voltage VCS Overcurrent protection release Excess discharge detection non-induction time Excessive current detection during non-induction time Overcurrent non-induction time Operating limit voltage *1 *2 *2 (=4.7kΩ) Measurement Conditions VCC=VIN=3.5V VCC=VIN=1.9V Ta=-20°C~70°C VCC=VIN=3.9V 4.4V VOC : L H VCC=VIN=4.4V 3.9V VOC : H L VOC-VOCR VCC=VIN=3.1V 2.0V VGD : H L VCS=0V VCC=VIN=3.1V 2.0V VCS=0.05V, VGD : H L VCC=VIN=2.0V 3.1V VGD : L H VCC=VIN=2.75V VCS : 0V -0.5V, VGD : L H VCS=0V 0.12V VGD : H L Min. Typ. Max. Units 10.0 14.0 µA 0.7 1.0 µA 4.200 4.250 4.300 V 3.950 4.050 4.150 V 150 200 250 mV 2.50 2.60 2.70 V 2.30 2.40 2.50 V 2.78 2.90 3.02 V -0.3 -0.1 90 100 V 110 mV load release (more than 5 MEG) tOD tOC1 tALM VOP VCC=VIN=3.0V 2.4V, 1 measurement circuit 2, SW1 : b, SW2 : a VCS=0V VCS, 1 measurement circuit 2, SW1 : a, SW2 : b VCC=VIN=4.0V 4.5V, 1 measurement circuit 2, SW1 : b, SW2 : a CTD=0.082µF VCC When VGDL2 > 0.4V * * * GD pin output voltage H VGDH VCC=VIN=3.5V GD pin output voltage L1 GD pin output voltage L2 OC pin output current VGDL1 VGDL2 IOC VCS > 1.0V VCC=VIN=3.5V, VCS=0.5V VCC=VIN=4.5V, SW1 : b Refer to input waveforms. Operation is unstable below the operating limit voltage. 5.0 10.0 15.0 mS 5.0 10.0 15.0 mS 0.5 1.0 1.5 S 1.2 V VCC -0.3 VCC -0.1 0.1 0.2 V 0.3 0.4 -30 V V uA Protection of Lithium Ion Batteries (one cell) MM1291 MITSUMI MM1291CFBE Absolute Maximum Ratings (Ta=25°C) Item Storage temperature Operating temperature Power supply voltage Symbol TSTG TOPR VCC VOC VCS PD VCC-OC pin voltage CS pin voltage Allowable loss Rating -40~+125 -20~+70 -0.3~+18 -18~0 -0.6~VCC 300 Units °C °C V V V mV * The CS pin will not cause abnormal operation when connected to protection resistor R Electrical Characteristics Symbol ICC1 ICC2 IIN1 IIN2 IOP3 IOP4 Overcharge detection voltage VALM Overcharge reset voltage VALML Overcharge hysteresis voltage VALM Excess discharge detection voltage 1 VS1 Excess discharge detection voltage 2 VS2 Excess discharge reset voltage VDF Starting voltage VST Overcurrent detection voltage VCS Overcurrent protection release Excess discharge detection non-induction time Excessive current detection during non-induction time tOD tOC1 tOC2 tALM *2 VOP *12 * Measurement Conditions VCC=4.5V VCC=3.5V VIN=4.5V VIN=3.5V VCC=VIN=1.9V VCC=VIN=1.0V Ta=-20°C~70°C VCC=VIN=4.0V 4.2V VCC : L H VCC=VIN=4.2V 4.0V VOC : H L VALM-VALML VCC=VIN=3.1V 2.0V VGD : H L VCC=VIN=3.1V 2.0V VCS=0.05V, VGD : H L VCC=VIN=2.0V 3.1V VGD : L H VCC=VIN=2.75V VCS=0V -0.5V, VGD : L H VCS=0V 0.17V VGD : H L Min. Typ. Max. Units 40 60 µA 8.0 11.0 µA 3.0 5.0 µA 2.0 3.0 µA 0.7 1.0 µA 0.17 µA 4.050 4.100 4.150 V 4.018 4.075 4.128 V 18 25 32 mV 2.50 2.60 2.70 V 2.30 2.40 2.50 V 2.78 2.90 3.02 V -0.3 -0.1 135 150 V 165 mV load release (more than 5 MEG) Overcurrent non-induction time Operating limit voltage (=4.7k Ω) (Unless otherwise specified Ta=25 °C, VCC=VIN=3.5V, VCS=0V, Measurement circuit 1, SW1 : a) Item Current consumption 1 (VCC pin) Current consumption 2 (VCC pin) Current consumption 1 (VIN pin) Current consumption 2 (VIN pin) Current consumption 3 (VCC, VIN pins) Current consumption 4 (VCC, VIN pins) Overcurrent detection delay CS GD pin output voltage H VGDH GD pin output voltage L1 GD pin output voltage L2 OC pin output current VGDL1 VGDL2 IOC VCC=VIN=3.0V 2.4V, 1 measurement circuit 2, SW1 : b, SW2 : a VCS=0V VCS, 1 measurement circuit 2, SW1 : a, SW2 : b VCS=0V 1.0V, 1 measurement circuit 2, SW1 : b, SW2 : a VCC=VIN=4.0V 4.5V, 1 measurement circuit 2, SW1 : b, SW2 : a CTD=0.082µF * * * * 5.0 10.0 15.0 mS 5.0 10.0 15.0 mS 100 µS 1.5 S 1.2 V 0.5 1.0 VCC When VGDL2 > 0.4V VCC -0.3 VCS > 1.0V VCC=VIN=1.5V VCC=VIN=4.5V, SW1 : b Refer to input waveforms. Operation is unstable below the operating limit voltage. VCC -0.1 0.1 0.2 V 0.3 0.4 -30 V V uA