Lithium-Ion Battery Charge Control MM1581 MITSUMI Lithium-Ion Battery Charge Control Monolithic IC MM1581 Outline This is a lithium-ion battery charge control IC. It incorporates constant-voltage and constant-current circuits for easy implementation of lithium-ion battery charge. It includes functions to disable charging to overdischarged batteries and disable charging due to abnormal temperature, etc. It is also equipped with a 2channel LED driver to allow the charge status to be displayed. Features 1. Operating supply voltage 4.8~15.0V 2. Operating ambient temperature -20~85C 3. Current consumption 7.0mA typ. 4. Low voltage detection voltage 1.54V typ. (rank A) 2.60V typ. (rank B) 5. BAT pin output voltage 4.200.03V 6. Recharge detection voltage 3.99V typ. 7. Precharge detection voltage 3.07V typ. 8. Fast-charge current setting Rsense=0.256V/IqCHG Example: For 0.512A, 0.256V/0.512A=0.5 (Rsence) Precharge current 0.026V/Rsence=0.026/0.5=0.052A Full-charge adjustable for rank A Full-charge current Example: When ADJ = 0.25V, 5 * 0. *full-charge current=0.25V, full-charge current=0.1A 9. Recharge delay time 0.48s (C1=0.1F) 10. Full-charge detection delay time 0.52s (C2=0.1F) 11. Temperature detection delay time 0.049s (C3=0.1F) 12. LED switching delay time 1.0s (C2=0.1F) Package TSOP-16A Application For lithium-ion/lithium-polymer battery protection circuits Pin Assignment 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 TSOP-16A (TOP VIEW) 1 2 3 4 5 6 7 8 TDET C3 ADJ VREF VCC N. C LEDR LEDG 9 10 11 12 13 14 15 16 C1 C2 N. C GND BAT CSCS+ CNT Lithium-Ion Battery Charge Control MM1581 MITSUMI Block Diagram VCC 5 CN 16 CS+ 1 CS1 BA 13 Rated voltage control circuit Rated current control circuit LEDG 8 LEDR 7 Vref 4 ADJ 3 Reference power supply Current detection circuit Mis-detection prevention circuit 3.07V 1.49V 1.54V Mis-detection prevention circuit Mis-detection prevention circuit 1 TDET 3.21V 10 12 9 2 C2 GND C1 C3 Lithium-Ion Battery Charge Control MM1581 MITSUMI Pin Description Pin no. Pin name 1 TDET I/O Function Input Temperature detection and battery connection detection pin (used for both) Internal equivalent circuit diagram VCC 1 GND 2 C3 Input Temperature detection delay. Time setting pin (TPd=49ms C3=0.1F) VCC 2 GND 3 ADJ Input Charging detection voltage setting pin (typ.=49ms C3=0.1F) VCC 3 GND Lithium-Ion Battery Charge Control MM1581 MITSUMI Pin no. Pin name 4 VREF I/O Output Function Internal equivalent circuit diagram Reference voltage output in (typ.=4.53V) VCC 4 GND 5 VCC Input Power voltage 5 VCC GND 6 7 N. C LEDR N.C Output LED connection pin Lights up during charging (open collector output) VCC 7 GND Lithium-Ion Battery Charge Control MM1581 MITSUMI Pin no. Pin name 8 LEDG I/O Input Function Internal equivalent circuit diagram LDE connection pin when charging is complete (open collector output) VCC 8 GND 9 C1 Input Current detection delay time setting pin (typ.=0.48s C3=1.0F) VCC 9 GND 10 C2 Input Current detection delay time setting pin (typ.=0.48s C2=1.0F) VCC 10 GND Lithium-Ion Battery Charge Control MM1581 MITSUMI Pin no. Pin name 11 12 N. C GND I/O Function Internal equivalent circuit diagram N. C GND pin 12 13 BAT Input Battery voltage detection pin VCC 13 GND 14 CS- Input Charging current detection pin (connect to low detection resistance side) 14 GND 15 CS+ Input Charging current detection pin (connect to high detection resistance side) 15 GND Lithium-Ion Battery Charge Control MM1581 MITSUMI Pin no. Pin name 16 CNT I/O Output Function Internal equivalent circuit diagram Output pin (open collector output) VCC 1 GND Absolute Maximum Ratings (Ta=25C) Item Symbol Ratings Units Storage temperature TSTG -40~+150 C Operating temperature TOPR -20~+85 C Supply voltage VIN -0.3~+16 V CNT pin output current ICNT 30 mA TDET pin output voltage VTIN -0.3~VCC V Allowable loss Pd 400 (Not attached) mW Recommended Operating Conditions (Ta=25C) Item Symbol Ratings Units Operating temperature TOPR -20~+85 C CNT current 1CNT 0~30 mA Operating voltage VOP 4.8~15.0 V Lithium-Ion Battery Charge Control MM1581 MITSUMI Electrical Characteristics (Except where noted otherwise, Ta=25C, VCC=12V, VSENSE=3.6V, C1=1.0F, C2=1.0F, C3=0.1F) Item Symbol Measurement conditions Consumption current ICC When LED OFF Reference voltage Vref Low voltage detection voltage VLV VBAT: L Pre-charge detection voltage VP VBAT: L BAT pin output voltage VBAT Re-charge detection voltage VR BAT pin input current IBAT Current Limit 1 VIL1 VBAT: H Measurement Min. Typ. Max. Units Circuit a 4 7 10 mA a 4.30 4..53 4.76 V H a 1.44 1.54 1.64 V H a 2.97 3.07 3.17 V a 4.17 4.20 4.23 V a 3.89 3.99 4.09 V b -2 2 A a 15 26 37 mV a 232 256 280 mV a 237 257 275 mV L 1.54V < Battery voltage <3. 07V Pre-charge 5.0V <= VCC <= 8.0V Current Limit 2-1 VIL2-1 3.07V <= Battery voltage <= 4.2V Quick charge 8.0V<VCC <= 15.0V Current Limit 2-2 VIL2-2 3.07V <= Battery voltage <= 4.2V Quick charge Full charge detection voltage 1 VFl Vadj=0.13V a 15 26 37 mV Full charge detection voltage 2 VF2 Vadj=0.5V a 75 100 125 mV CS+ pin input current ICS+ VCS+ -3.6V a 60 85 A CS- pin input current ICS- VCS-=3.6V a 60 85 A LED R pin output voltage VLEDR ILED R=10mA b 0.4 V LED G pin output voltage VLEDG ILED G=10mA b 0.4 V Battery temperature VTH1 a 3.11 3.21 3.31 V VTL1 a 1.39 1.49 1.59 V VTH2 a 3.13 3.23 3.33 V VTH2 a 1.49 1.59 1.69 V TDET pin input bias current IT b -1.0 CNT pin output voltage VCNT ICNT=20mA b CNT pin leak current ICNT VOUT=15V b Re-charge detection delay time tdcl Re-charge time C1=1.0F c 0.34 Connection detection time 1 tdBDET 4.2V constant voltage output time C2=1.0F c Fullcharge detection delay time tdIDET C2=1.0F LED switching delay time tdILED Discharge time Temperature detection delay time detection voltage H1 Battery temperature detection voltage L1 Battery temperature detection voltage H2 Battery temperature detection voltage L2 Vref=4.53V A 1.0 2.0 V l.0 A 0.48 0.62 s 0.37 0.52 0.67 s c 0.37 0.52 0.67 s C2=1.0F c 0.71 1.00 1.3 s tdchg C2=1.0F (after current detection) c 13 41 tdC3 C3=0.1F c 34 49 ms 64 ms Lithium-Ion Battery Charge Control MM1581 MITSUMI Measuring Circuit Measuring circuit A VCC R1 680 VTIH1, 2 VTL1, 2 R2 240 1 16 C1 =1.0F Q1 R6 0.1F IDS+ 2 15 A R3 100 Vadj 3 V 14 4 A IDS- Vref D1 13 VBAT C4=1.0F ICC A R4 1 V 5 SW1 12 100mA C5=1.0F 6 11 7 10 V VLV VP VR A VBAT VLEDR 10k 10k C2=1.0F 8 9 C3=0.1F V VLEDG Note SW1 = b only during BAT pin output voltage measurement b IBAT a V VL1, VL-1, 2 VF1, VF2 Lithium-Ion Battery Charge Control MM1581 MITSUMI Measuring circuit B VCNT V SW2 VTIN a 20mA IT A 1 16 VCNT b C1=1.0F 2 15 A ICNT A ICS+ VCS+ A ICS- VCS- A IBAT VBAT Vadj 3 14 C4=1.0F 4 13 VCC 5 12 6 11 7 10 C5=10F V VLEDR C2=1.0F 10mA 8 9 C3=0.1F 10mA V Note SW2 = b only during CNT pin gain leak current measurement Lithium-Ion Battery Charge Control MM1581 MITSUMI Measuring circuit C VCC R1 680 VT R2 240 1 16 Q1 R6 0.1F C1=1.0F 2 15 R3 100 Vadj 3 R4 1 14 D1 C4=1.0F 4 13 5 12 Current probe VCC VBAT C1=10F 6 11 7 10 VBAT oscilloscope 1k C2=1.0F 8 1k oscilloscope 9 C3=0.1F Lithium-Ion Battery Charge Control MM1581 MITSUMI Application Circuit RSENCE B+ VCC 5 CNT 16 1 SE+ 1 SE- Rated voltage control circuit 8 LED G LED R 7 Vref 4 1F 3 ADJ Battery pack 1.49V Misdetection prevention circuit Misdetection prevention circuit 1.0F Rated current control circuit 3.07V 1.54V C2 16 BAT Misdetection prevention circuit Reference power supply Current detection circuit 13 Vref 1 TDET 3.21V GND 12 C1 9 1.0F 2 C3 0.1F B- Lithium-Ion Battery Charge Control MM1581 MITSUMI Operation 12-1 Charging operation Charging is prohibited in the following cases. 1. AC adaptor or battery is not connected properly. 2. TDET pin voltage is outside the range from battery temperature detection voltage L1 to battery temperature detection voltage H1. If neither of the above problems exists, charging starts. 12-2 Battery voltage check operation *When potential within the range from battery temperature detection voltage L1 to battery temperature detection voltage H1 is impressed on the TDET pin, then after temperature detection delay time, VBAT output voltage is 4.2V. Then, after 1.15 seconds (when C2 = 2.2F) output voltage is switched to 1.46V, battery voltage is detected and charging starts. (Voltage detection is not performed during this time.) Also, during 4.2V constant voltage output, current detection resistance voltage drop is limited to 256mV. 12-3 Abnormal battery detection *Charging is stopped if, after battery voltage check, the battery is deemed abnormal because battery voltage goes below low voltage detection voltage. 12-4 Pre-charge operation *Charging is done by pre-charge current when, after battery voltage check, battery voltage is below low voltage detection voltage (VLV). 12-5 Full charge operation *When battery voltage rises and BAT pin voltage reaches pre-charge detection voltage (VP), the battery is charged by full charging current. The standard value for full charging current is determined by the value obtained by dividing current limit 1 (VL1) by the external resistance between CS+ and CS-. *When battery voltage rises, the operation switches from constant current charging to constant voltage charging when BAT pin voltage approaches BAT pin output voltage (VBAT). *After switching to constant voltage charging, charging current gradually diminishes. When charging current goes below the value obtained by dividing full charge detection voltage (VF) by the external resistance between CS + -CS, charging is completed after full charge detection delay time and the LED G pin open collector NPNP transistor goes on. (LED G stays lit except when (1) AD adaptor is removed, or (2) when outside battery temperature detection voltage range (including removal of battery).) *If battery voltage is already at BAT pin voltage when charging starts, charging is completed after full charge detection delay time, and the LED G pin open collector NPN transistor goes on. 12-6 Re-charge operation *After full charge detection, battery voltage drops from charging completed state, and re-charge starts when it goes below re-charge detection voltage. 12-7 Temperature monitoring function *The potential divided from VREF by the external resistor and thermistor is monitored by the TDET pin. *When a thermistor is not used, a resistor can be connected to enable charging, but temperature protection will no longer operate. Battery open detection assumes a removable thermistor in the battery pack. A battery open detection circuit would be required if a thermistor is not used. Lithium-Ion Battery Charge Control MM1581 MITSUMI 12-8 Charging state verification *The open collector NPN transistor inside LEDR normally goes on during pre-charging and full charging operations. When a PULL UP connection is made to LEDR via the red LED and a resistor, pre-charging and full charging can be verified by the red LED lighting up and staying lit. 12-9 Charging complete verification *When full charge is detected, the open collector NPN transistor inside the LEDR pin goes off after full charge delay time elapses, and the open collector NPNP transistor inside the LEDG pin goes on. Full charge can be verified by making pull-up connections between the LEDR pin and red LED and LEDG pin and green LED via resistors and checking that the red LED is off and the green LED is flashing, 12-10 Check charging prohibited state *For the following charging prohibited states, the LED G pin and LED R pin open collector NPN transistors remain off. The LEDs do not light up. 1. Battery is not connected properly. 2. AC adapter is not connected properly. 3. Battery temperature is outside charging start temperature range. 12-11 Recovery after charging prohibited state *The conditions are as follows for recovery after charging prohibited state: 1. Cut connection to charger and re-connect. 2. Cut battery connection and re-connect. 12-12 Quick charge and charging complete settings 1. Setting current value (Iqchg) for quick charge Quick charge current value Icqchg depends on sensing resistor resistance value Rsense. Insert the desired quick charge value Iqchg into the following formula and set the sensing resistor value. Rsense () = Charging current setting voltage 2 256mV = Iqchg (mA) Iqchg (mA) Pre-charge current at this time becomes the following value. Pre-charge current (A)= charging current setting voltage 1 26mV = Rsense () Rsense () 2. Setting charging complete detection current value (Icomp) Charging complete detection current value Icomp depends on sensing resistor resistance value Rsense and ADJ pin voltage Vadj. Insert the desired charging complete detection current value and the sensing resistor value set in 1. into the following formula to set ADJ pin voltage. Vadj (V) =5 Rsense () Icomp (A) (Note) is IC internal fixed value Note Lithium-Ion Battery Charge Control MM1581 MITSUMI The graph below shows examples of ADJ pin voltage setting and the relationship between charging complete detection current (Icomp) and ADJ pin voltage (Vadj). Please use as reference for sensing resistor and ADJ pin voltage settings. ADJ pin voltage setting examples Quick charge 256mA 450mA 512mA 700mA Sensing resistor Rsense 1 0.56 0.50 0.36 Charging complete current Icomo 26mA 100mA 130mA 100mA 130mA 100mA 130mA 125mV 280mV 364mV 250mV 325mV 180mV 234mV ADJ pin voltage Vadj=5 Rs Icomo Use several 10k for ADJ resistor (R, R2) total resistance value. Lithium-Ion Battery Charge Control MM1581 MITSUMI Flow Chart Battery set Charging prohibited Charging OFF LED R, LED G: not lit No 1.59 VTDET 3.23V Yes Temperature detection delay circuit start No after 49ms 1.59 VTDET 3.23V Yes LED R lit ADJ pin voltage 256mA constant current charging Charging complete current= 4.2V constant voltage (output for 0.48s) 5 Rsence 1.46V constant voltage output Charging prohibited Charging OFF LED R, LED G: not lit 1.54V VBAT 1.54V 3.07V VBAT 4.2V Battery voltage check 4.2V VBAT VBAT 4.2V Battery voltage check 1.54V VBAT 3.07V Charging complete current below Charging current check Charging complete current below Current detection delay circuit start 26mA constant current charging No Battery voltage check VBAT 3.07V Yes 4.2V constant voltage charging 26mA constant current charging Charging current Charging complete current below (fixed 0.52s) No Yes Current detection (Voltage output 1.40V switching) Battery voltage check 3.07V 4.2V VBAT 4.2V VBAT Temperature detection during charging (temperature hysteresis function) flow chart for constant voltage charging or constant current charging (1.49 VTIN 3.21V) LED R or G lit up 4.2V constant voltage charging Charging current check Charging complete Charging complete current current below Current detection below delay circuit start No No 1.49 3.23V Yes Temperature delay time delay circuit start Charging current Charging complete current below (fixed 0.52s) Yes VTDET after 49ms TDET voltage VTDET 1.49V 3.23V VTDET No Current detection (output voltage 1.46V switching) Yes LED R: not lit LED G: lit Connection Charging complete 1.0s passed LED R: not lit LED G: lit No Battery voltage check VBAT 3.99V Charging prohibited LED: not lit No Yes Voltage detection delay circuit start No Battery voltage check VBAT 3.99V (fixed for 0.48s) Yes 1.59 VTDET 3.21V Yes Temperature delay time delay circuit start No after 49ms TDET voltage 1.58V VTDET 3.21V Yes Lithium-Ion Battery Charge Control MM1581 MITSUMI Timing Chart Timing at the time of battery connection Temperature detection timing 4.2V 49ms Battery temperature 45C 42.5C BAT pin voltage 1.46V 3C 2.5C 0.52s ON Charge OFF Voltage detection 49ms 49ms 49ms 49ms Current detection Charging start Battery connection Timing at the time of charge 4.20V 3.99V Constant current charge Battery voltage 0.48s 3.07V Pre-charge 1.54V full charge Constant voltage charge 256mA Constant voltage charge (It charges by the impedance of a battery.) 0.52s Charge current 26mA Charging stop 256mA 256mA Re-charge 0.52s ADJ voltage/ 5 RSENCE 26mA Completion of charge The completion of battery temperature detection ON Charge LED R OFF Putting out lights Lighting 0.48s Lighting Putting out lights ON Charge LED G OFF Lithium-Ion Battery Charge Control MM1581 MITSUMI Characteristics (Except where noted otherwise, Ta=25C, VCC=12V, VSENSE=3.6V, C1=1.0F, C2=1.0F, C3=0.1F) 20 18 16 14 12 10 8 6 4 2 0 Standard voltage characteristic 6.0 Output voltage (V) ICC (mA) Consumption current characteristic 5.0 4.0 3.0 2.0 1.0 0.0 0 1 2 3 4 5 6 7 8 9 1011121314 15 VCC (V) VCC (V) TDEF characteristic 300 300 250 250 IBAT (mA) IBAT (mA) Charge current characteristic 200 150 100 50 200 150 100 50 0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 VBATT (V) VIDET (V) VBAT pin characteristic 1.0 0.8 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1.0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 VBAT (V) TDET pin current characteristic ITDET (A) IBANT (A) 0 1 2 3 4 5 6 7 8 9 1011121314 15 0.0 -0.1 -0.2 -0.3 -0.4 -0.5 -0.6 -0.7 -0.8 -0.9 -1.0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 VTDET (V) Lithium-Ion Battery Charge Control MM1581 MITSUMI Re-charge delay time vs capacitance value 10.000 Delay time (s) Delay time (s) 100.00 10.00 1.00 0.10 0.01 0.1 Temperature detection delay time vs capacitance value 1 10 1.000 0.100 0.010 0.001 0.01 100 C1 capacitance value (F) 1000 1000 100 100 10 1 0.1 1 10 1 0.1 0.01 0.1 100 1 10 100 C2 capacitance value (F) LED switch delay time vs capacitance value 1000.0 Discharge time vs capacitance value 100.000 10.000 Delay time (s) Delay time (s) 10 10 C2 capacitance value (F) 100.0 10.0 1.0 0.1 0.1 1 Full charge detection delay time vs capacitance value Delay time (s) Delay time (s) Connection detection delay time vs capacitance value 0.01 0.1 0.1 C3 capacitance value (F) 1 10 C2 capacitance value (F) 100 1.000 0.100 0.010 0.001 0.1 1 10 C2 capacitance value (F) 100