IC for Control of Lithium-ion Batteries Charging MM1433 MITSUMI IC for Control of Lithium-ion Batteries Charging Monolithic IC MM1433 Outline This IC is used to control charging of lithium-ion batteries. This one IC incorporates functions for constantcurrent and constant-voltage charging and for precharging, for an overcharge timer, battery temperature detection, and other protective functions. It was developed by adding to the previous MM1332 and 1333 the above-described functions. Features 1. Charging voltage accuracy 2. Consumption current 3. Precharge function. 4. Recharge function. 5. Overcharge timer. 6. Battery temperature detection function. 7. We can supply type for one and two cells. ±30mV/cell. 5mA typ. Package TSOP-24A Applications IC for control of lithium-ion batteries charging. Pin Assignment 24 23 22 21 20 19 18 17 16 15 14 13 1 2 3 4 5 6 7 8 9 10 11 12 TSOP-24A 1 CHGSW 13 BAT1 2 RESET 14 BAT2 3 TP1 15 CS 4 TP2 16 CFB 5 VREF 17 CNT 6 GND1 18 VCC 7 GND2 19 ADJ5 8 ADJ1 20 VOUT 9 ADJ2 21 LED G 10 ADJ3 22 LED R 11 ADJ4 23 OSC OUT 12 TDET 24 OSC FB- MITSUMI Block Diagram IC for Control of Lithium-ion Batteries Charging MM1433 IC for Control of Lithium-ion Batteries Charging MM1433 MITSUMI Pin Description Pin No. Pin name I/O Functions Forced charging OFF pin 1 CHGSW Input L: Forced charging circuit ON (OFF for reset) H: Charging stop is forced Logic reset pin 2 RESET Input L: Forced charging circuit ON (start) H: Forced charging circuit OFF Test pin 1 Pre-charge timer test pin 3 TP1 Input/ Inverts while counting (the middle stage of the several FF stages) and output to Output TP1, to permit monitoring. Also, TP1 output signal is inverted again inside the IC and inputs to the next stage FF. (Timer setting is done by binary counter.) 4 TP2 Input/ Output Test pin 2 Full charge timer test pin Same structure as TP1 Reference power supply output pin 5 VREF Output Outputs 1.2V typ. reference voltage. Used for temperature detection reference power supply and ADJ1 - ADJ4 adjustment. 6 GND1 Input Ground pin. 7 GND2 Input Ground pin. 8 ADJ1 Input Overcurrent detection adjustment pin Set so that overcurrent detection does not function. Pin voltage is 1.16V typ. Full charge detection adjustment pin Pin voltage is set at 93mV typ. Full charge detection value can be changed by 9 ADJ2 Input adjusting pin voltage with an external resistor, etc. Full charge detection is done by comparing ADJ2 pin voltage and 12dB voltage drop value between CS and BAT. Pre-charge current adjustment pin Pin voltage is set at 120mV typ. Pre-charge current can be changed by adjusting 10 ADJ3 Input pin voltage with an external resistor, etc. Pre-charge current control is done by comparing ADJ3 pin voltage and 12dB voltage drop value between CS and BAT. Full charge current adjustment pin Pin voltage is set at 0.89mV typ. Full charge current can be changed by adjusting pin voltage with an external resistor, etc. 11 ADJ4 Input Full charge current control is done by comparing ADJ4 pin voltage and 12dB voltage drop value between CS and BAT. When full charge current is controlled to rated current by an adapter, short ADJ4 pin and VREF pin so that rated current control does not function in the IC. IC for Control of Lithium-ion Batteries Charging MM1433 MITSUMI Pin No. Pin name I/O Functions Temperature detection input pin 12 TDET Input Apply potential resistance divided by external resistor and thermistor from reference voltage when using. Reset state will exist if TDET pin does not reach the specified potential. 13 BAT1 Input Battery voltage input pins 14 BAT2 Input Detect battery voltage and control charging. Current detection pin 15 CS Input Detects current by external resistor (between CS and BAT) voltage drop and controls charging current. Rated current control phase compensation pin 16 CFB Input Oscillation is improved by connecting an external capacitor (around 100pf) between CFB and CNT for phase compensation. 17 CNT Output 18 VCC Input Charging control output pin Controls external PNP-Tr base for rated current rated voltage charging. Power supply input pin Rated voltage control adjustment pin 19 ADJ5 Input Allows fine adjustment of rated voltage value. For example, rated voltage value rises by around 15mV (at 4.1V typ.) when ADJ5-GND is shorted. Overvoltage detection output pin 20 VOUT Output For VCC overvoltage input: L For VCC recommended operating voltage: H 21 LED G Output 22 LED R Output LED C control output pin NPN-Tr open collector output. Refer to the flow chart for ON/OFF. LED R control output pin NPN-Tr open collector output. Refer to the flow chart for ON/OFF. Oscillator output pin Timer setting time changes according to oscillation frequency. 23 OSC OUT Output Oscillation frequency is determined by an external resistor (connected between OSC OUT and OSC FB) and capacitor (connected between OSC FB and GND). For example, the full charge timer setting is 4H for external resistor of 130kΩ and capacitor of 0.01µF. 24 OSC FB- Input Oscillator inverted input pin IC for Control of Lithium-ion Batteries Charging MM1433 MITSUMI Pin Description Pin No. Pin name (The values below are average values) Equivalent circuit diagram Pin No. Pin name Equivalent circuit diagram Pin No. Pin name 1 CHGSW 10 ADJ3 17 CNT 2 RESET 11 ADJ4 19 ADJ5 3 TP1 12 TDET 20 VOUT 4 TP2 13 BAT1 21 LED G 5 VREF 14 BAT2 22 LED R 8 ADJ1 15 CS 23 OSC OUT 9 ADJ2 16 CFB 24 OSC FB- Equivalent circuit diagram IC for Control of Lithium-ion Batteries Charging MM1433 MITSUMI Absolute Maximum Ratings (Ta=25°C) Item Symbol Ratings Unit Storage temperature TSTG -40~+125 °C Operating temperature TOPR -20~+70 °C Power supply voltage VCC max. -0.3~+15 V Allowable loss Pd 250 mW Recommended Operating Conditions Item Symbol Ratings Unit Operating temperature TOPR -20~+70 °C Charging control operating voltage VOPR 2.7~5.9 V Electrical Characteristics (Except where noted otherwise, Ta=25°C, VCC=5V) Conditions Measurement Min. Typ. Max. Unit circuit Item Symbol Consumption current ICC 18 5.0 Reference voltage VREF 5 1.207 ADP detection voltage L VADPL V 2.35 2.45 2.55 V 20 50 100 150 mV 20 6.1 6.3 6.5 V VADPHW 20 50 100 150 mV ZADPL 20 BAT pin leak current IBAT 13, 14, 15 BAT pin output voltage VBAT Ta=0~+50°C 13 CNT pin output voltage VCNT ICNT=20mA 17 CHGSW pin input current ISW CHGSW pin input voltage H VSWH CHGSW pin input voltage L VSWL RESET pin input current IRE RESET pin input voltage H VREH RESET pin input voltage L Hysteresis voltage width ADP detection voltage H ADP detection voltage H Hysteresis voltage width Impedance for ADP detection output L L mA 20 ADP detection voltage L VCC : H 7.0 VADPLW VADPH VCC : L H 30 kΩ 1 4.070 4.100 4.130 1 40 CHGSW : OFF 1 0.6 CHGSW : ON 1 60 V 0.5 V 80 µA 1.20 V 0.25 V 80 µA 1.20 V 0.25 V 2 40 Charging control circuit: OFF 2 0.6 VREL Charging control circuit: ON 2 Current limit 1 VL1 Quick charge 14, 15 0.20 0.22 0.24 V Current limit 2 VL2 Pre-charge 14, 15 21 26 31 mV Full charge detection VF 14, 15 13 18 23 mV Low voltage detection voltage VLV 13 1.90 2.00 2.10 V VBAT : L H 60 µA IC for Control of Lithium-ion Batteries Charging MM1433 MITSUMI Item Symbol Low voltage detection voltage Hysteresis voltage width Pre-charge detection voltage Pre-charge detection voltage Hysteresis voltage width Measurement Min. Typ. Max. Unit circuit Conditions VLVW VBAT : L VP H VPW 13 25 50 100 mV 13 2.80 2.90 3.00 V 13 25 50 100 mV Re-charge detection voltage VR VBAT : H L 13 3.85 3.90 3.95 V Overvoltage detection voltage VOV VBAT : L H 13 4.30 4.35 4.40 V 12 0.835 0.860 0.885 V 12 0.390 0.413 0.435 V 12 0.335 0.353 0.370 V 12 30 150 nA Battery temperature Low temperature 3°C VTH detection voltage H Battery temperature ± 3°C detection High temperature 43°C ± 3°C VTL1 detection voltage L1 Battery temperature detection (charging start) High temperature 50°C ± 3°C VTL2 detection voltage L2 detection (during charging) TDET input bias current IT LED R pin output voltage VLEDR ILEDR=10mA 22 0.4 V LED G pin output voltage VLEDG ILEDG=10mA 21 0.4 V Not including external deviation 21, 22 10 % T Timer error time -10 Note 1: Current limits 1 and 2 and full charge detection are specified at current detection resistor voltage drop. Note 2: If the IC is damaged and control is no longer possible, its safety can not be guaranteed. Please protect with something other than this IC. Note 3: Temperature detection is the setting value at B constant 3435 (10KC15-1608 made by Ishizuka Denshi). Note 4: Use a capacitor with good temperature characteristics in the oscillator. Capacitor deviation will contribute to timer error. Note 5: If the battery overdischarges, charge 1mA for 14 seconds, and if it does not switch to pre-charging during that interval, it means the IC has identified a battery abnormality. OSC CR Setting Reference Materials (1) OSCR CR-Oscillation Cycle T Examples R 75k 100k 120k 130k 150k 200k 0.0047µ 0.47mS 0.63mS 0.75mS 0.82mS 0.94mS 1.26mS 0.0082µ 0.83mS 1.10mS 1.32mS 1.43mS 1.65mS 2.20mS 0.01µ 1.03mS 1.37mS 1.63mS 1.77mS 2.04mS 2.73mS 0.015µ 1.48mS 1.98mS 2.38mS 2.58mS 2.97mS 3.95mS 0.022µ 2.16mS 2.87mS 3.44mS 3.73mS 4.30mS 5.76mS C IC for Control of Lithium-ion Batteries Charging MM1433 MITSUMI (2) Timer Times Item Calculation formula Pre-charge timer T 219 Full charge timer T 223 1mA charge time T 213 Full charge detection delay time T 26 Overcurrent detection delay time T 28 Overvoltage detection delay time T 28 Re-charge detection delay time T 25 LED R blinking cycle T 210 Note: T: OSC oscillation cycle Measuring Circuit Examples of calculation (for C = 0.01µ, R = 230k) 15min. 28S 4h7min. 14.5S 0.11S 0.45S 0.45S 56.6mS 1.8S IC for Control of Lithium-ion Batteries Charging MM1433 MITSUMI Measurement Procedures Item Consumption current Reference voltage ADP detection voltage L ADP detection voltage L Hysteresis voltage width ADP detection voltage H ADP detection voltage H Hysteresis voltage width Impedance for ADP Ldetection output BAT pin leak current BAT pin output voltage CNT pin output voltage CHGSW pin input current CHGSW pin input voltage H CHGSW pin input voltage L RESET pin input current RESET pin input voltage H RESET pin input voltage L Current limit 1 Current limit 2 Full charge detection Low voltage detection voltage Low voltage detection voltage Hysteresis voltage width Pre-charge detection voltage Pre-charge detection voltage Hysteresis voltage width Re-charge detection voltage Overvoltage detection voltage Battery temperature detection voltage H Battery temperature detection voltage L1 Battery temperature detection voltage L2 TDET input bias current LED R pin output voltage LED G pin output voltage (Except where noted otherwise, Ta = 25°C, VCC=5V, V1=V2=0V, V13=4.2V, SW12, 17, 20, 22, 24:A, I15=0mA Timers are not in time up state.) Measurement Procedures V1 = 1.2V. Measure A18 current value ICC. Measure T5 potential VREF. Gradually lower Vcc from 5V; VCC - potential is VADPL when T20 potential drops below 0.5V. Gradually lower VCC - from 2V. VCC - potential is VADPL2 when T20 potential goes over VCC - 0.5V. VADPLW = VADLP2 - VADPL Gradually increase Vcc from 5V. Vcc potential is VADPH when T20 potential drops below 0.5V. Gradually lower VCC from 7V. VCC potential is VADPH2 when T20 potential goes over VCC - 0.5V. VADPHW = VADPH - VADPH2 VCC = 7V, SW20: B, V20 - 0.5V, impedance between T20-GND is ZADPL. VCC = 0V, SW17: B, V17 = 0V. Measure A13 current value IBAT. Gradually lower V13 from 3.5V. T13 potential is VBAT when T15 - T13 potential difference falls to less than 20mV. V13 = 3.5V, SW17: B. Gradually raise V17 from 0V. T17 potential is VCNT when A17 current value 20mA. Measure A1 current value ISW. V13 = 3.5V. Raise V1 from 0V to 1.2V. CHGSW: ON when A13 is more than 500mA. CHGSW: OFF when A13 is less than 1mA. Measure VSW. Measure A2 current value IRE. V13 = 3.5V. Raise V2 from 0V to 1.2V. Charging control circuit: ON when A13 is more than 500mA. Charging control circuit: OFF when A13 is less than 1mA. Measure VRE. V13 = 3.5V. T15-T13 potential difference is VL1. V13 = 3.5V. T15-T13 potential difference is VL2. SW24: B, I15 = 100mA. Gradually reduce I15 current value after reset. T15 T13 potential difference is VF when T21 potential goes under 0.5V. Gradually raise V13 from 0V. T13 potential is VLV when A13 current value goes over 50mA. Gradually lower V13 from 2.5V. T13 potential is VLV2 when A13 current value goes over 10mA. VLVW = VLV - VLV2 Gradually raise V13 from 2.5V. T13 potential is VP when A13 current value goes over 500mA. Gradually lower V13 from 3.5V. T13 potential is VP2 when A13 current value goes under 150mA. VPW = VP= VP2 Wait about 1S at V13 = 4.2V; in full charge detection state, gradually lower V13 potential to lower T21 potential to under 0.5V. T13 potential is VR when T21 potential is more than VCC - 0.5V. Gradually raise V13 from 4V. T13 potential is VOV when T22 potential starts to repeat HI/LOW. V13 = 3.5V, SW12: B. Gradually raise V12 from 0.6V. T12 potential is VTH when A13 current value goes under 1mA. V13 = 3.5V, SW12: B. Gradually raise V12 from 0V. T12 potential is VTL1 when A13 current value goes over 500mA. V13 = 3.5V, SW12: B. Gradually raise V12 from 0.6V. T12 potential is VTL2 when A13 current value goes over 1mA. SW12: B, V12 = 0V. Measure A12 current value IT. V13 = 3.5V, SW22: B. Gradually raise V22 from 0V. T22 potential is VLEDR when A22 current value is 10mA. Wait about 1S at V13 = 4.2V; in full charge detection state, make T21 potential 0.5V or less. Next at SW21: B, gradually raise V21 from 0V. T21 potential is VLEDG when A21 current value is 10mA. IC for Control of Lithium-ion Batteries Charging MM1433 MITSUMI Timing Chart Charging performed normally Adapter abnormality VCC: ON Start 5.5V VCC 0V 0V BAT pin voltage 4.1V BAT pin voltage 3.9V 2.9V 0A LED R Charging current 0A 1mA Charging Pre- Full charge charge ON LED G OFF 0A Full Recharge charge OFF ON 5.5V LED G Battery overcharge 5.5V VCC 0V BAT pin 4.35V voltage 3V Charging current Charging current 0A LED R OFF OFF 0V BAT pin voltage OFF ON Power supply setting error (temperature detection pin open) VCC 3V Charging current 2V LED R 7V VCC Abnormality detection at BA pin overvoltage for 0.5S or more 0A OFF LED R ON/OFF 0.57Hz LED G OFF LED G OFF IC for Control of Lithium-ion Batteries Charging MM1433 MITSUMI Battery overdischarge Overcurrent detection Overcurrent detection does not function 5.5V VCC 0V BAT pin voltage 2V or less 0V No battery voltage reset 14S Charging current 0A 1mA charging LED R ON/OFF 0.57Hz LED G OFF Pre-charge time up Full charge time up 5.5V VCC 0V BAT pin voltage Battery voltage 2V or less Battery voltage 2.9V or less 15min. Charging current 0A LED R 5.5V VCC 0V BAT pin voltage Battery voltage 2.9V or more 4H Charging current 0A Charging at about 12% of full charge LED R ON Full charge ON ON/OFF 0.57Hz LED G No full charge detection OFF ON/OFF 0.57Hz LED G OFF IC for Control of Lithium-ion Batteries Charging MM1433 MITSUMI Battery full charge Re-charge detection VCC 5.5V 5.5V VCC 0V 3.9V 0V 4.1V BAT pin voltage 0.11S BAT pin voltage 1 Charging current Charging current 0A LED R LED G 56mS Full charge 0A ON OFF LED R OFF ON LED G Application Circuit OFF ON ON OFF MITSUMI Flow Chart IC for Control of Lithium-ion Batteries Charging MM1433 IC for Control of Lithium-ion Batteries Charging MM1433 MITSUMI Characteristics Current limit 1 - Temperature Current limit 2 - Temperature 50 Current limit 2 (mV) Current limit 1 (V) 0.3 0.25 0.2 0.15 0.1 -25 0 25 50 40 30 20 10 0 -25 75 Ambient temperature (°C) 25 50 75 Ambient temperature (°C) VCNT voltage - ICNT current VLED G, R voltage (V) VCNT voltage (V) 0.4 0.3 0.2 0.1 0 1 10 3.95 3.94 3.93 3.92 3.91 3.9 3.89 3.88 3.87 3.86 3.85 -25 0 Ta=25°C 0.4 G 0.3 0.2 R 0.1 0 1 10 Ta=25°C C=0.022µF C=0.01µF C=0.0047µF 2 1 0 100 120 140 160 100 BAT pin reverse current - BAT pin voltage 180 OSC resistance R (kΩ) 200 BAT pin reverse current (µA) Oscillation cycle (mS) 3 75 ILED G, R current (mA) OSC oscillation cycle - CR 4 50 0.5 ICNT current (mA) 5 25 Ambient temperature (°C) 100 6 75 VLED G, R voltage - ILED G, R current Ta=25°C 0.5 50 Re-charge detection voltage - Temperature Re-charge detection voltage (V) BAT pin output voltage (V) 0 25 Ambient temperature (°C) BAT pin output voltage - Temperature 4.15 4.14 4.13 4.12 4.11 4.1 4.09 4.08 4.07 4.06 4.05 -25 0 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 0 0.5 1 1.5 2 2.5 3 3.5 BAT pin voltage (V) 4 4.5