Lithium-Ion Battery Charge Control for AC Charger Monolithic IC MM1707 Series

Transcription

1 Lithium-Ion Battery Charge Control for AC Charger Monolithic IC MM1707 Series Outline This IC is a one-cell lithium ion battery charge control IC for AC chargers. The charging current and charging can be optimally controlled by controlling the primary side through a photocoupler. It incorporates a charging over timer, delay circuit for misoperation prevention, and over/overcurrent functions. It includes a 2-channel LED display circuit, which allows displaying the charge status. Features 1. Various charge control functions 2. Battery temperature function 3. Recharge function Accuracy ±50mV 4. Full-charge function Accuracy ±3.4mV 5. Voltage control function for the primary side of an AC adaptor 6. Abnormal battery function (Overdischarge/overcharge functions, battery temperature function) 7. Abnormal charge prevention function with a built-in timer 8. 2-channel LED display function 9. Misoperation prevention function with a built-in delay circuit Package TSOP-16A, TSOP-16B Applications 1. Cell phones 2. Portable music players 3. Digital still cameras 4. Portable game devices 5. PDA

2 Block Diagram MM1707BV B+ BATTERY PACK LI-I BATTERY CNT1 OSC-R 15 constant control BAT constant control constant current control 10 BAT OSC-C 16 TP1 1 TP2 2 OSC timer adaptor over adaptor under thermal shutdown charge control 3 CFB1 4 CFB2 under precharge over overcurrent full charging battery temperature reference 5 VREF 6 TDET 9 CNT2 CS 8 GND 7 B- TH THERMISTOR

3 MM1707CV B+ BATTERY PACK LI-I BATTERY CNT1 OSC-R 15 constant control BAT constant control constant current control 10 BAT OSC-C 16 TP1 1 TP2 2 Pin Assignment OSC timer adaptor over adaptor under thermal shutdown charge control 3 CFB1 4 CFB2 under precharge recharge over overcurrent full charging battery temperature reference 5 VREF 6 TDET 9 CNT2 CS 8 GND 7 B- TH 1 TP1 9 CNT2 2 TP2 10 BAT 3 CFB1 11 CNT1 THERMISTOR TSOP-16A TSOP-16B (TOP VIEW) 4 CFB VREF 13 6 TDET 14 7 GND 15 OSC-R 8 CS 16 OSC-C

4 Pin Description Pin no. Pin name I/O Function TEST output pin. 1 TP1 OUTPUT 2 TP2 OUTPUT 3 CFB1 INPUT 4 CFB2 INPUT 5 VREF OUTPUT 6 TDET INPUT 10 BAT INPUT Pre-charge timer test pin. Inverts while couting and output to TP1, to permit monitoring. Also, TP1 output signal is invered again inside the IC and inputs to the next stage FF. TEST output pin. Full-charge timer test pin. Same structure as TP1. Rated BAT control phase compensation pin. Oscillation is improved by connecting an external capacitor between CFB1 and CNT2 for phase compensation. Rated control phase compensation pin. Oscillation is improved by connecting an external capacitor between CFB2 and CNT2 for phase compensation. Reference power supply output pin. Outputs about 1.2Volts typ. reference. Used for temperature reference power supply. Temperature input pin. Apply potential resistance divided by external resistor and thermistor from reference when using. Reset state will exist if TDET pin does not reach the specified potential. 7 GND INPUT GND pin 8 CS INPUT Current input pin. Detects charging current by external resistor (between CS and GND) drop and cintrols charging current. The full charge current is set using following formula; Ichg=VL1(V)/R1(Ω) Photo diode drive pin of photo coupler for and BAT constant and 9 CNT2 OUTPUT constant current control. Connect to cathode of diode. 11 CNT1 OUTPUT Battery output pin. Detect battery and cntrol charging. Charging control output pin. Controls external PNP-Tr. 12 INPUT Power supply input pin. 13 OUTPUT output pin. NPN-Tr open collector output OSC-R OUTPUT INPUT output pin. NPN-Tr open collector output. Oscillator output pin Timer setting time changes according to oscillation cycle. Oscillation cycle is determined by an external resistor and capacitor. 16 OSC-C OUTPUT Oscillator inverted input pin.

5 Pin Description2 Pin no. Pin name Equivalent circuit diagram Pin no. Pin name Equivalent circuit diagram 1 TP1 1.2V 6 TDET TDET VREF CS 2 TP2 1.2V 3 CFB1 4 CFB2 BAT CFB1 CS CFB2 CS VREF 8 CS 9 CNT2 10 BAT CS BAT VREF CS VREF GND CNT2 5 VREF 11 CNT1 VREF CNT1 CS GND

6 Pin no. Pin name Equivalent circuit diagram Pin no. Pin name Equivalent circuit diagram OSC-R 1.2V OSC-R GND GND OSC-C GND Absolute Maximum Ratings (Ta=25 C) OSC-C Item Symbol Ratings Units Storage temperature TSTG -55~+150 C Operating temperature TOPR -40~+85 C Supply VDD max. -0.3~+12 V Allowable loss Pd 300 mw Recommended Operating Conditions Item Symbol Ratings Units Operating temperature TOPR -40~+85 C Supply VOPR 2.7~5.9 V VREF GND

7 Electrical Characteristics (Except where noted otherwise Ta=25 C, =5V) MM1707BV Item Symbol Measurement conditions Min. Typ. Max. Units Consumption current IDD =5V ma Reference VREF =5V V L VL =H L V L hysteresis width VLW mv H VH =L H V H hysteresis width VHW mv control V V leakage current IBAT =5V, BAT=3.5V 1 µa output VBAT =5V, Ta=0~+50 C V Current limit 1 VL1 Full charge BAT=3.5V mv Current limit 2 VL2 Pre-charge BAT=2.5V mv Full charge VF mv Overcurrent VOC mv Low VLV VBAT=L H V Low hysteresis width VLVW mv Pre-charge VP VBAT=L H V Pre-charge hysteresis width VPW mv Over VOV VBAT=L H V Battery temperature Low temperature -3 C±3 C VTH H (rising threshold) V Battery temperature High temperature 53 C±3 C VTL1 L1 (falling threshold) V Battery temperature High temperature 43 C±3 C VTL2 L2 (abnomal reset) (rising threshold) V TDET pin input current ITDET na LED R pin output VLED R ILED R=10mA 0.4 V LED G pin output VLED G ILED R=10mA 0.4 V CNT1 pin output VCNT1 ICNT1=10mA 0.4 V CNT2 pin output VCNT2 ICNT2=5mA 0.4 V Oscillation cycle TOSC t including external deviation R=130kΩ, C=0.µF ms Current limits 1, 2 and full charge are specified at current resistor drop. 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. Temperature is the setting value at B constant 3435(10KC made by Ishizuka Denshi). Use a capacitor with good temperature characteristics in the oscillator. Capacitor deviation will contribute to timer error. The standard value of Timer error time is Pre- charge, Full charge.

8 MM1707CV Item Symbol Measurement conditions Min. Typ. Max. Units Consumption current IDD =5V ma Reference VREF =5V V L VL =H L V L hysteresis width VLW mv H VH =L H V H hysteresis width VHW mv control V V leakage current IBAT =5V, BAT=3.5V 1 µa output VBAT =5V, Ta=0~+50 C V Current limit 1 VL1 Full charge BAT=3.5V mv Current limit 2 VL2 Pre-charge BAT=2.5V mv Full charge VF mv Overcurrent VOC mv Low VLV VBAT=L H V Low hysteresis width VLVW mv Pre-charge VP VBAT=L H V Pre-charge hysteresis width VPW mv Re-charge VR VBAT=H L V Over VOV VBAT=L H V Battery temperature Low temperature -3 C±3 C VTH H (rising threshold) V Battery temperature High temperature 53 C±3 C VTL1 L1 (falling threshold) V Battery temperature High temperature 43 C±3 C VTL2 L2 (abnomal reset) (rising threshold) V TDET pin input current ITDET na LED R pin output VLED R ILED R=10mA 0.4 V LED G pin output VLED G ILED R=10mA 0.4 V CNT1 pin output VCNT1 ICNT1=10mA 0.4 V CNT2 pin output VCNT2 ICNT2=5mA 0.4 V Oscillation cycle TOSC t including external deviation R=130kΩ, C=0.1µF ms Current limits 1, 2 and full charge are specified at current resistor drop. 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. Temperature is the setting value at B constant 3435(10KC made by Ishizuka Denshi). Use a capacitor with good temperature characteristics in the oscillator. Capacitor deviation will contribute to timer error. When the battery overdischarge condition, it 3mA charge for 36 seconds, and then it does not switch to precharging during that interval, it means the IC has identified a battery abnormality. The standard value of Timer error time is Pre- charge, Full charge, 3mA charge, and Blinking cycle.

9 Electrical Characteristics2 (OSC Capacitor setting te) Oscillation cycle Unit: s R C 75kΩ 100kΩ 120kΩ 130kΩ 150kΩ 200kΩ 0.047µF 4.9m 6.5m 7.8m 8.5m 9.8m 13.0m 0.082µF 8.7m 11.6m 13.9m 15.1m 17.4m 22.9m 0.1µF 10.7m 14.2m 16.9m 18.3m 21.1m 28.2m 0.15µF 16.0m 21.2m 25.4m 27.7m 31.8m 42.1m 0.22µF 23.2m 31.1m 37.5m 40.8m 46.5m 61.8m Timer of each times MM1707BV Item T; OSC oscillation cycle Calculation formula Examples of calculation (for C=0.01µF, R=130kΩ; T=18.3ms) 1199s Pre-charge timer (VBAT>2.) T 2 16 (19min 59s) 19189s Full charge timer T 2 20 (5h 19min 49s) 3mA charge timer T s Full charge delay time T s Overcurrent delay time T s Over delay time T s Battery temperature delay time T s MM1707CV Item Calculation Examples of calculation formula (for C=0.01µF, R=130kΩ; T=18.3ms) 1199s Pre-charge timer (VBAT>2.) T 2 16 (19min 59s) Full charge timer T s (5h 19min 49s) 3mA charge timer T s Full charge delay time T s Overcurrent delay time T s Over delay time T s Re-charge delay time T s Battery temperature delay time T s blinking cycle T s T; OSC oscillation cycle

10 Measuring Circuit 47µF A1 BAT 12kΩ 270Ω A2 0.1µF T2 A SW7 B 1nF 130kΩ 16 T5 15 SW kΩ SW5 13 T6 12 C 1kΩ B A SW4 T T3 9 SW3 12kΩ 5V TP1 OSC-C TP2 OSC-R CFB1 CNT1 BAT CNT2 MM1707 CFB2 VREF TDET GND µF 1nF T1 10kΩ 10kΩ 0.1µF A SW1 B C bias1 A3 CS 10Ω 3Ω 4.7µF 10Ω SW2 A B C 15kΩ 3.5kΩ bias2 3.5V 5.

11 Measuring Procedures (Except where noted otherwise Ta=25 C, SW1: A, SW31:, SW41: A, SW51:, SW6:, SW7: A) MM1707BV Item Consumption current Reference L L hysteresis width H H hysteresis width control leakage current output Current limit 1 (Full charge) Current limit 2 (Pre-charge) Full charge Overcurrent Low Low hysteresis width Pre-charge Pre-charge hysteresis width Over Battery temperature H Battery temperature L1 Battery temperature L2 TDET pin input current LED R pin output LED G pin output Measuring procedures The A1 current value when SW1: B, SW2: C, SW3:, SW4: B, SW5:, SW6:, BAT=3.5V and bias1=1.25v is ICC. The T1 when SW1: C, SW2: C, SW3:, SW4: B, SW5:, SW6: and BAT=3.5V is VREF. BAT=1.85V. Gradually decrease from 2.6V. The when T2 oscillation stops is L. BAT=1.85V. Gradually raise from 2.3V. The when T2 starts to oscillate is L2 and the difference between L and L2 is LW. BAT=2.2V. Gradually raise from 6.05V. The when T2 oscillation stops is H. BAT=2.2V. Gradually raise from 6.55V. The when T2 starts to oscillate is H2 and the difference between H and H2 is HW. BAT=2.2V. Gradually raise from 4V. when T3 switches from 5V to is V. The A2 current value when =5V and BAT=3.5V is IBAT. =5., bias2=0.05v and SW2: B. Gradually decrease BAT from 4.05V. The BAT when T3 switches from 5V to is VBAT1 and VBAT=VBAT =5V, BAT=3.5V and SW2: B. Gradually raise bias2 from 0.14V. The bias2 when T3 switches from 5V to is VL1. =5V, BAT=2.5V and SW2: B. Gradually raise bias2 from 0.01V. The bias2 when T3 switches from to 5V is VL2. =4.5V, BAT=4.15V and SW2: B. Gradually decrease Bias2 from 0.03V. The bias2 when T5 switches from to 5V is VF. =4.5V, BAT=3.5V and SW2: B. Gradually raise Bias2 from 0.16V. The bias2 when T4 switches from to 5V is VOC. =4.05V and gradually raise BAT from 1.85V. The BAT when T4 switches from 5V to is VLV. =4.05V and gradually decrease BAT from 2.2V. The BAT when T4 switches from to 5V is VLV2 and the difference between VLV and VLV2 is VLVW. =4.3V, bias2=0.027v, SW2: B and gradually raise BAT from 2.75V. The BAT when T3 switches from 5V to is VP1 and VP=VP =4.3V, bias2=0.027v, SW2: B and gradually decrease BAT from 3.2V. The BAT when T3 switches from to 5V is VP2 and the difference between VP1 and VP2 is VPW. =4.5V, bias2=0.05v and SW2: B. Gradually raise BAT from 4.05V. The BAT when T6 switches from to 5V is VOV1, and VOV=VOV =4.05V, BAT=2.5V and SW1: B. Gradually raise bias1 from 0.9. The bias1 when T6 switches from to 5V is VTH. =4.05V, BAT=2.5V and SW1: B. Gradually decrease bias1 from 0.4. The bias1 when T6 switches from to 5V is VTL1. =4.05V, BAT=2.5V and SW1: B. Gradually decrease bias1 from 0.3. The bias1 when T6 switches from 5V to is VTL2. =4.5V, BAT=2.5V, bias1=1.2v, SW1: B and the current value A3 is ITDET. =4.5V, BAT=2.5V, SW3:, SW4: C, SW5:, SW6: and the T6 when 10mA flows on T6 is VLEDR. =4.5V, BAT=2.5V, SW3:, SW4: C, SW5:, SW5: and the T5 when 10mA flows on T5 is VLEDG.

12 Item CNT1 pin output CNT2 pin output Oscillation cycle Measuring procedures =4.5V, BAT=3.5V, SW3:, SW4: C, SW5:, SW5: and the T4 when 10mA flows on T4 is VCNT1. =4.5V, BAT=2.5V, SW3:, SW4: C, SW5:, SW5: and the T3 when 5mA flows ont3 is VCNT2. The cycle of T2 signal when =4.5V and BAT=2.5V is TOSC. MM1707CV Item Consumption current Reference L L hysteresis width H H hysteresis width control leakage current output Current limit 1 (Full charge) Current limit 2 (Pre-charge) Full charge Overcurrent Low Low hysteresis width Pre-charge Pre-charge hysteresis width Re-charge Over Battery temperature H Measuring procedures The A1 current value when SW1: B, SW2: C, SW3:, SW4: B, SW5:, SW6:, BAT=3.5V and bias1=1.25v is ICC. The T1 when SW1: C, SW2: C, SW3:, SW4: B, SW5:, SW6: and BAT=3.5V is VREF. BAT=1.85V. Gradually decrease from 2.6V. The when T2 oscillation stops is L. BAT=1.85V. Gradually raise from 2.3V. The when T2 starts to oscillate is L2 and the difference between L and L2 is LW. BAT=2.2V. Gradually raise from 6.05V. The when T2 oscillation stops is H. BAT=2.2V. Gradually raise from 6.55V. The when T2 starts to oscillate is H2 and the difference between H and H2 is HW. BAT=2.2V. Gradually raise from 4V. The when T3 switches from 5V to is V. The A2 current value when =5V and BAT=3.5V is IBAT. =5., bias2=0.05v and SW2: B. Gradually decrease BAT from 4.05V. The BAT when T3 switches from 5V to is VBAT1 and VBAT=VBAT =5V, BAT=3.5V and SW2: B. Gradually raise bias2 from 0.14V. The bias2 when T3 switches from 5V to is VL1. =5V, BAT=2.5V and SW2: B. Gradually raise bias2 from 0.02V. The bias2 when T3 switches from to 5V is VL2. =4.5V, BAT=4.15V and SW2: B. Gradually decrease Bias2 from 0.03V. The bias2 when T6 switches from to 5V is VF. =4.5V, BAT=3.5V and SW2: B. Gradually raise Bias2 from 0.16V. The bias2 when T4 switches from to 5V is VOC. =4.05V and gradually raise BAT from 1.85V. The BAT when T4 switches from 5V to is VLV. =4.05V and gradually decrease BAT from 2.2V. The BAT when T4 switches from to 5V is VLV2 and the difference between VLV and VLV2 is VLVW. =4.3V, bias2=0.027v, SW2: B and gradually raise BAT from 2.75V. The BAT when T3 switches from 5V to is VP1 and VP=VP =4.3V, bias2=0.027v, SW2: B and gradually decrease BAT from 3.2V. The BAT when T3 switches from to 5V is VP2 and the difference between VP1 and VP2 is VPW. =4.35V, bias2=0.05v and SW2: B. Gradually decrease BAT from 4.05V. The BAT when T6 switches from 5V to is VR1 and VR=VR =4.5V, bias2=0.05v and SW2: B. Gradually raise BAT from 4.05V. The BAT when T6 switches from to 5V is VOV1, and VOV=VOV =4.05V, BAT=2.5V and SW1: B. Gradually raise bias1 from 0.9. The bias1 when T6 switches from to 5V is VTH.

13 Item Battery temperature L1 Battery temperature L2 TDET pin input current LED R pin output LED G pin output CNT1 pin output CNT2 pin output Oscillation cycle Timing Chart MM1707BV Case of normal charging 2. Low ; start Output Pre charging control 2.9V Pre charge Full charging BAT output Measuring procedures =4.05V, BAT=2.5V and SW1: B. Gradually decrease bias1 from 0.4. The bias1 when T6 switches from to 5V is VTL1. =4.05V, BAT=2.5V and SW1: B. Gradually decrease bias1 from 0.3. The bias1 when T6 switches from 5V to is VTL2. =4.5V, BAT=2.5V, bias1=1.2v, SW1: B and the current value A3 is ITDET. =4.5V, BAT=2.5V, SW3:, SW4: C, SW5:, SW6: and the T6 when 10mA flows on T6 is VLEDR. =4.5V, BAT=2.5V, SW3:, SW4: C, SW5:, SW5: and the T5 when 10mA flows on T5 is VLEDG. =4.5V, BAT=3.5V, SW3:, SW4: C, SW5:, SW5: and the T4 when 10mA flows on T4 is VCNT1. =4.5V, BAT=2.5V, SW3:, SW4: C, SW5:, SW5: and the T3 when 5mA flows ont3 is VCNT2. The cycle of T2 signal when =4.5V and BAT=2.5V is TOSC. control Full charge Case of connecting abnormal adapter 3V 7V

14 Case of setting battery error (temparature pin ; open) Case of overcharged battery control control 3V 4.35V over more than 0.586s Case of overdischarged battery control under 2V 37.5s 3mA charging return to normal (over 2V) Case of overcurrent 3V control 0.586s Overcurrent

15 Case of time-up for Pre charging Case of time-up for full charging control control over 2V under 2.9V over 2.9V 19min 59s 5h 19min Pre charging Full charging of Full charge Case of Full charged battery 0.146s Full charge delay time control Full charge

16 MM1707CV Case of normal charging Case of connecting abnormal adapter 2. Low ; start Output Pre charging control 2.9V Pre charge Full charging BAT output control Re-charge Full charge Case of setting battery error (temparature pin ; open) 3V control 3.9V Re-charge 3V 7V 4.35V Case of overcharged battery control over more than 0.586s

17 Case of overdischarged battery Case of overcurrent control control under 2V 37.5s 3mA charging return to normal (over 2V) 3V 0.586s Overcurrent / Case of time-up for Pre charging control over 2V 19min 59s Pre charging under 2.9V / over 2.9V 5h 19min Full charging Case of time-up for full charging control of Full charge /

18 Case of Full charged battery Case of Re-charge control control 0.146s Full charge delay time Full charge 3.9V 0.073s Re-charge delay time Full charging

19 Flow Chart MM1707BV START Always adapter judgment LED display Adapter OK? 2.45V<<6.3V rmal Battery OK? Always battery setting judgment Temparature OK? 37.5s 3mA charge under 2V Battery OK? 2.<VBAT<4.35V Battery OK? VBAT>2.9V 5h timer start Full charge (quickly charge) Charge current OK? IBAT<IOC Over OK? VBAT<4.35V rmal Abnormal charging prohibited Always temparature judgment (TBATTERY>53 C) rmal (TBATTERY<43 C) (Time out) Battery OK? 2.<VBAT When the value is normal, charging is restarted. (Time out) TIME OUT Charge stop 19min timer start Pre charge Battery OK? VBAT>2.9V LED lit up Red lit up TIME OUT Full charge detect? IBAT<IF Finish charging Green lit up Abnormal charging prohibited LED display: LED lit up When charging is prohibited, disconnect the power supply, remove the battery or use reset (SW pin) to start abain.

20 MM1707BV START Adapter OK? 2.45V<<6.3V Battery OK? Always adapter judgment rmal Always battery setting judgment LED display LED lit up Temparature OK? 37.5s 3mA charge under 2V Battery OK? 2.<VBAT<4.35V Battery OK? VBAT>2.9V 5h timer start Full charge (quickly charge) Charge current OK? IBAT<IOC Over OK? VBAT<4.35V TIME OUT rmal (TBATTERY>53 C) rmal (TBATTERY<43 C) (Time out) Abnormal charging prohibited Battery OK? 2.<VBAT When the value is normal, charging is restarted. (Time out) Charge stop 19min timer start Pre charge Battery OK? VBAT>2.9V LED lit up Red blinking Red lit up Full charge detect? IBAT<IF Finish charging Battery OK? VBAT<3.9V LED lit up Abnormal charging prohibited When charging is prohibited, disconnect the power supply, remove the battery or use reset (SW pin) to start abain. Red blinking

21 Application Circuit AC input B+ AC Adapter Input Protection Circuit OSC-R OSC-C TP1 CNT1 BAT CNT2 CS B- Battery Pack TP2 GND CFB1 CFB2 VREF TDET Portable Equipment These circuits are typical examples provided for reference purposes, so in actual applications, the circuit constants, conditions and operations should be thoroughly studied. Mitsumi Electric Co., Ltd. assumes no responsibility for any trouble or damage as a result of the use of these circuits. Mitsumi Electric Co., Ltd. assumes no responsibility for any infringement of industrial property or any other right of a third party or us, as a result of the use of these circuits. TH