Lithium-Ion Battery Charge Control (1 to 2 cells) MM1433 MITSUMI Lithium-Ion Battery Charge Control (1 to 2 cells) Monolithic IC MM1433 Outline This IC is used to control charging of lithium-ion batteries. It is a one-chip charge control IC where the protection circuit incorporates constant-current/constant-voltage charge and precharge, overcharge timer, and battery temperature detection functions. It was developed by adding the above-described functions to the conventional MM1332 and MM1333. Series Table Temperature conditions A: Ta=-25~75°C, B: Ta=-20~70°C, C: Ta=0~50°C, D: Ta=0~40°C Output Full charge Over voltage Output voltage detection detection Remarks voltage (V) temperature voltage (mV) voltage (v) SOP-8C, 8E VSOP-8A, 8B TSOP-16A TSOP-24A conditions Package MM1433 AV 4.100±0.030 C 18±5 4.35±0.05 1cell BV 8.400±0.060 C 12±5 8.70±0.10 2cell EV 4.200±0.030 C 18±5 4.35±0.05 1cell Features 1. Charge voltage accuracy (Ta=0°C ~ +50°C) ±30mV/cell 2. Current consumption 5mA typ. 3. Precharge function 4. Recharge function 5. Overcharge timer 6. Battery temperature detection function 7. Adaptor (primary side) abnormality detection function 8. LED driver (R, G pins) 9. Available for 1 to 2 cells Package TSOP-24A Applications For lithium-ion battery charge control * Lithium-Ion Battery Charge Control (1 to 2 cells) MM1433 MITSUMI 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- Block Diagram 33pF 33pF 33pF Note: For lithium ion battery charging control (1-2 cells) For mobile telephones and other cases in which high frequency noise could be a problem, we recommend lowering impedance by adding 33pF capacitance between the VREF pin and GND, between the CS pin and GND, and between external PNP TR base and GND. Please make sure that the wiring on the pattern is kept as short as possible. When implementing noise countermeasures, be sure to consider the set as a whole. Applicable circuits shown are typical examples provided for reference purposes. Mitsumi cannot assume responsibility for any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same. Lithium-Ion Battery Charge Control (1 to 2 cells) 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 GND pin. 7 GND2 Input GND pin. Overcurrent detection adjustment pin Set so that overcurrent detection does not function. Pin voltage is 1.16V typ. 8 ADJ1 Input Overcurrent detection value can be varied by adjusting pin voltage with an external resistor, etc. Overcurrent detection is based on a comparison of ADJ1 pin voltage and a CS-BAT voltage drop of 12dB. Full charge detection adjustment pin Pin voltage is set at 103mV 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. Lithium-Ion Battery Charge Control (1 to 2 cells) MM1433 MITSUMI Pin No. Pin name I/O Functions 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. 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 Lithium-Ion Battery Charge Control (1 to 2 cells) MM1433 MITSUMI Pin Description Pin No. Pin name (Models listed MM1433E) 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 16 CFB 24 OSC FB- 114.3k 9 ADJ2 Equivalent circuit diagram Lithium-Ion Battery Charge Control (1 to 2 cells) 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) Models listed MM1433E Conditions Measurement Min. Typ. Max. Unit Pin 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 4.170 4.20 1 40 CHGSW : OFF 1 0.6 CHGSW : ON 1 60 1 µA 4.23 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 kΩ Lithium-Ion Battery Charge Control (1 to 2 cells) 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 Pin 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 Lithium-Ion Battery Charge Control (1 to 2 cells) 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 Examples of calculation (for C = 0.01µ, R = 230k) 15min. 28s 4h7min. 14.5s 0.90s 0.45s 0.45s 56.6ms 1.8s Note: T: OSC oscillation cycle Operation 1. Basic Functions · Constant voltage/constant current control. · Full charge status detection. 2. Protection Functions · Protection when AC adapter or battery is abnormal. · Protection from abnormal operation by monitoring battery temperature. · Protection from abnormal operation by time limitation. 3. Warning Functions · Constant lighting of green LED to show completion of normal charging · Constant lighting of red LED to show normal charging operation · Blinking of red LED showing charging disabled on detection of abnormality. · Operation check of internal timer for time limitation 4. Forced Stop Function · Forced stopping of charging by controlling RESET and CHGSW pins. 5. Charge Restart Functions · Charge restart when battery voltage drop detection operates after full charge detection · Charge restart by reconnecting after disconnecting AC adaptor · Charge restart by reconnecting after removing batteries · Charge restart by canceling forced stop operation Description 1. Charging Operation 1.1 Start of Charging · Charging is disabled at the start of charging in the following cases: 1) Battery is in overvoltage state, i.e., the battery voltage is higher than overcharge detection voltage (Vov). (Charging is prohibited after overvoltage delay time elapses.) 2) AC adapter or battery is not correctly connected. 3) RESET pin and CHGSW pin are 0.6 ~ 1.2V. MITSUMI Lithium-Ion Battery Charge Control (1 to 2 cells) MM1433 4) Pin 12 (TDET) is open. · At the start of charging, charge waiting results in the following cases (initially prohibited, but charging starts when the voltage returns to the normal range): 1) AC adapter supply voltage is less than VADPL or higher than VADPH. 2) Pin 12 (TDET) voltage is outside the range from battery temperature detection voltage L1 (VTL1) to battery temperature detection voltage H (VTH). Even during charging or when fully charged, neither LED will light up and the timer will be reset if pin 12 (TDET) voltage is outside the temperature range. AC adapter abnormality detection, RESET and TDET will operate similarly. · Except in the above cases, charging starts. 1.2 1mA Charging Operation · When charging starts, if the battery's voltage is below the low voltage detection voltage (VLV), the battery is charged using the 1mA charging current. · If the battery is overdischarged, a time limit is provided by a 1mA charging timer in order to protect the battery if the battery voltage does not rise because of some problem. If battery voltage does not reach VLV within the time set by the 1mA charging timer, charging is prohibited. · See "OSC CR Settings" on the data sheet for the 1mA charge timer setting. 1.3 Preparatory Charging Operation · When battery voltage is higher than low voltage detection voltage (VLV), the battery is charged by pre-charge current. The standard preparatory charging current is determined by dividing current limit 2 (VL2) by the value of the external resistance (0.3-Ω recommended) between pins 14 and 15. This status is maintained until the battery's voltage rises and the voltage at pin 13 reaches the preparatory charging detection voltage (VP). · However, if for some reason the battery does not reach the preparatory charge detection voltage (VP), the preparatory charge timer limits the time in this state in order to protect the battery. If the battery does not reach the preparatory charge detection voltage (VP) within the preparatory charge timer's setting, charging is disabled. · See "OSC CR Settings" on the data sheet for the preparatory charge timer setting. 1.4 Full Charging Operation · When the battery voltage rises and the voltage at pin 13 reaches the preparatory charge detection voltage (VP), charging starts using the full charging current. The standard full charging current is determined by dividing the current limit 1 (VL1) by the value of the external resistance (0.3-Ω recommended) between pins 14 and 15. · As the battery voltage rises, operation switches from constant current charging to constant voltage charging when the voltage at pin 13 approaches the output voltage at the BAT pin (VBAT). · After switching to constant voltage charging, the charging current is gradually reduced. When the charging current drops below the value determined by dividing the full-charge detection value by the external resistance (0.3-Ω recommended) between pins 14 and 15, charging continues for the value of the full-charge detection delay timer, then stops, and the open collector NPN transistor at pin 21 (LED G) turns ON. · However, a time limit is provided by a full-charge timer in order to protect the battery if, due to some abnormality, battery voltage does not reach BAT pin output voltage (VBAT), or if charging current does not drop off after switching to constant voltage charging and full charge detection does not operate. After the full charge timer setting time has elapsed, charging will be prohibited in the above cases. · See "OSC CR Settings" on the data sheet for the full-charge detection delay timer setting and fullcharge timer setting · If, at the start of charging, the battery is already at BAT pin voltage, charging is continued for the value of the full-charge detection delay timer and then stops, and the open collector NPN transistor at pin 21 (LED G) turns ON. MITSUMI Lithium-Ion Battery Charge Control (1 to 2 cells) MM1433 1.5 Recharging Operation · On detection of a full charge and after the end of charging, the battery voltage starts to drop. Recharging starts when the voltage has dropped to the recharge detection voltage (There is no recharging detection function for rank B.). 2 Other Protective Functions 2.1 Forced Charge Disabling Function · By setting pin 1 (CHGSW) or pin 2 (RESET) level HIGH (0.6V - 1.2V), charging is disabled. Normally, ground these pins. · Pin 1 (CHGSW): Charging ON/OFF only; timer continues to work. Used to temporarily prohibit charging. · Pin 2 (RESET): Resets timer simultaneously with charging ON/OFF. · Disablement using pin 2 takes precedence over pin 1. · Pin 1 and Pin 2 are connected to Pin 5 (reference power supply output: VREF) via an internal resistor. This reference power supply does not have sync capability, so high level should not exceed Pin 5 voltage (VREF). 2.2 Temperature Monitoring Function · A potential created by splitting the voltage at pin 5 (VREF) using external resistor and thermistor is monitored at pin 12 (TDET). Charging is disabled if, at the start of charging, the temperature is not within the range of 3°C to 43°C, or between 3°C and 50°C during charging. · If a thermistor is not used, a resistor can be connected for charging operation, but temperature protection will not operate. Note: Battery OPEN detection assumes that the battery pack thermistor is removable. If the thermistor is not used, a battery OPEN detection circuit is required. · Pin 5 (VREF) is approximately 1.207V ± 2% and output source current is approximately 180mA. · Confirmation of charging prohibited status If charging is prohibited during charging due to the timers reaching time up, the open collector NPN transistor inside Pin 22 (LED R) will repeat ON/OFF. This can be verified by connecting Pin 22 (LED R) via a resistor (pull-up connection) to an LED, which will blink. 2.3 Hysteresis and Delay Times · To protect the circuit from malfunction due to noise, etc., hysteresis characteristics are applied to the ADP detection voltage, low-voltage detection voltage, and preparatory charge detection voltage. · Also, a constant delay time is applied to full-charge detection, over-voltage detection, and recharge detection operations. · The respective delay times are set by the internal timers. See the "OSC CR Settings" on the data sheet for the timer settings. 3. Checking Charging Operation · During pre-charging and full charge operations, the open collector NPN transistor inside Pin 22 (LED R) is constantly ON. Pre-charging and full charge can be verified by connecting Pin 22 (LED R) via a resistor (pull-up connection) to a red LED, which will be constantly lit. · During 1mA charging operation, the open collector NPN transistor inside Pin 22 (LED R) repeats ON/OFF. When operation switches from 1mA charging to pre-charging, the open collector NPN transistor inside Pin 22 (LED R) stays ON constantly. Switching from 1mA charging to pre-charging can be verified by connecting Pin 22 (LED R) via a resistor (pull-up connection) to a red LED, which will be constantly lit. · If charging is prohibited during charging due to the timer reaching time up, the open collector NPN transistor inside Pin 22 (LED R) will repeat ON/OFF. This can be verified by connecting Pin 22 (LED R) via a resistor (pull-up connection) to an LED, which will blink. · Pre-charging timer operation can be verified by Pin 3 (TP1) high/low switching. The TP1 pin signal inverts at the 10th stage of the pre-charge timer binary counter (total 19 stages) and MITSUMI Lithium-Ion Battery Charge Control (1 to 2 cells) MM1433 outputs on the TP pin. Referring to the data sheet “OSC CR setting reference materials,” when T = 1.77ms, a waveform with cycle of approximately 1.8s is output. · Full charge timer operation can be verified by Pin 4 (TP2) high/low switching. The TP2 pin signal inverts at the 12th stage of the full charge timer binary counter (total 23 stages) and outputs on the TP pin. Referring to the data sheet “OSC CR setting reference materials,” when T = 1.77ms, a waveform with cycle of approximately 7.2s is output. · The blinking period of the LED connected to pin 22 is determined by the internal timer. See the "OSC CR Settings" on the data sheet for the timer settings. 4. Checking the End of Charging · For full charge detection, after the full charge delay time elapses, the open collector NPN transistor inside Pin 22 (LED R) goes OFF, and the open collector NPN transistor inside Pin 21 (LED G) goes ON. This can be verified by a pull-up connection of Pin 22 (LED R) to a red LED and of Pin 21 (LED G) to a green LED via resistors. The red LED should be out and the green LED should be lit. 5. Checking Disabling of Charging · In the case of the following cases in which charging is disabled, the open collector NPN transistors at pin 21 (LED G) and pin 22 (LED R) remain OFF. The LEDs connected to pins 21 and 22 will not turn on. 1) When the battery is not connected correctly. 2) When the AC adapter is not connected correctly, or the voltage output by the AC adapter is less than VADPL or higher than VADPH. · If charging is disabled because the charger is faulty, the voltage at pin 20 (Vout) switches from HIGH level (pin 18 voltage to 0.5[v] max.) to LOW level (0.5[V] max.). You can check if the charger is faulty by monitoring this voltage. 3) When battery temperature is outside the charging start temperature range. 6. Recharging from Full Charge · Once charging ends as a result of the full-charge detection operation and the battery voltage drops as a result of it being used and simply by its own natural discharge, recharging starts when the recharge detection delay timer times out after the voltage drops to the recharge detection voltage. · See the "OSC CR Settings" on the data sheet for the recharge detection delay time. · There is no re-charging detection function for rank B. 7. Recovery from Charge-Disabled State · The following conditions apply before recovery can be implemented from the charge-disabled state: 1) Disconnect and then reconnect the charger. 2) Disconnect and then reconnect the battery. 3) Set pin 2 (RESET) to the HIGH RESET pin input voltage, then return it to the LOW RESET pin input voltage. 8. Other States · If power is supplied to MM1433 when a battery is not connected, the red LED may immediately start blinking (red LED blinking cycle is higher than the setting value). This is because voltage that is not within the temperature abnormality range detected by Pin 12 (TDET pin) is impressed, and Pins 13 and 14 (BAT 1, 2) oscillate while they are open. In IC operating state, the oscillation occurs because BAT pin impedance is high due to constant voltage control. The oscillation causes charging operation to go ON/OFF repeatedly, and the red LED blinks at BAT oscillation frequency. On this IC, it is assumed that battery connection check will be done using the thermistor inside the battery pack. If a thermistor is not used, the IC RESET pin will go ON/OFF according to whether a battery is present or not. MITSUMI Measuring Circuit Lithium-Ion Battery Charge Control (1 to 2 cells) MM1433 Lithium-Ion Battery Charge Control (1 to 2 cells) 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 = 4.27V; 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. Lithium-Ion Battery Charge Control (1 to 2 cells) 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 Lithium-Ion Battery Charge Control (1 to 2 cells) MM1433 MITSUMI Battery overdischarge Overcurrent detection Overcurrent detection does not function A Lank 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 Lithium-Ion Battery Charge Control (1 to 2 cells) MM1433 MITSUMI Battery full charge Re-charge detection VCC 5.5V 5.5V VCC 0V 3.9V 0V 4.1V BAT pin voltage BAT pin voltage 0.9s Charging current Charging current 0A LED R LED G 56ms Full charge 0A ON OFF LED R OFF ON LED G OFF ON ON OFF Application Circuit Note 1: This can be controlled even if a P-MOS FET is used in place of the external PNP-Tr. If you are using a P-MOS FET, insert a resistance of several thousand ohms between the source and gate. Note 2: Applicable circuits shown are typical examples provided for reference purposes. Mitsumi cannot assume responsibility for any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same. Lithium-Ion Battery Charge Control (1 to 2 cells) MM1433 MITSUMI Flow Chart (Models listed MM1433A) Lithium-Ion Battery Charge Control (1 to 2 cells) MM1433 MITSUMI Characteristics Current limit 1 vs Ambient temperature Current limit 2 vs Ambient 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 vs 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 vs 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 vs CR 4 50 0.5 ICNT current (mA) 5 25 Ambient temperature (°C) 100 6 75 VLED G, R voltage vs ILED G, R current Ta=25°C 0.5 50 Re-charge detection voltage vs Ambient temperature Re-charge detection voltage (V) BAT pin output voltage (V) 0 25 Ambient temperature (°C) BAT pin output voltage vs Ambient 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