MITSUBISHI Dig./Ana.INTERFACE M62240FP SINGLE CHIP BATTERY CHARGER CONTROL IC GENERAL DESCRIPTION The M62240FP is a general purpose battery charger control IC. It can control all of the sequence needed for battery charging, it also has functions such as detection of battery temperature, a protection against over-current/voltage, a safety timer and so on. Moreover, it can adapt to charge Ni-Cd, Ni-MH batteries by adding few peripheral components. The IC has the feedback control of the charge current and output voltage. PIN CONFIGURATION (TOP VIEW) ISET2 Vref1 LED Cc FEATURES • Low voltage (3V) operation • Built-in following functions and circuits ; • CR oscillator for internal logic • Initialization timer and safety timer for ∆V error detection and over-charging • D-A converter and shift registers to maintain the peak voltage of battery. • Main output SW driving circuits • LED driving circuit for displaying the status of the charging • System reset circuit for detecting the power supply voltage • Temperature detection circuit for the Ni-MH battery • Voltage and current control circuits for feedback to the primary side of the SMPS. • Protective functions including detection of over-voltage in charge mode and over-current in adapter mode and so on ChgSW GND BattSW VTRSW 20 ISET1 19 OC SET 18 IDET M62240FP Rc 1 2 3 4 5 6 7 8 9 17 Vcc 16 VDET 15 P.C 14 Batt T 13 Vref2 12 Batt - TEST 10 11 Batt + Outline 20P2N-A APPLICATION Battery charger for video cameras and handheld telephones, etc. BLOCK DIAGRAM Vcc 17 Vref1 Vref2 2 13 SYSTEM RESET CHT. STABLED PWR. SUP. VDET IDET 16 18 LED 3 ChgSW 6 LED DRIVER OUTPUT SW DRIVER 8 BattSW P.C 15 CONTROL LOGIC VOLTAGE SET-UP CKT. 9 VTRSW CURRENT SET-UP CKT. ISET1 20 ISET2 1 OSCILLATOR 7 GND 4 Rc CLOCK GEN. CKT. 5 Cc (1/ 6) OVER-CURRENT DET. CKT. BATTERY TEMP DET. CKT 14 Batt T -∆V ERROR DET. PREV. LOGIC BATT. VOLTAGE DET. CKT. 11 Batt + TEST CKT. 10 12 Batt 19 Test OCSET 9703 MITSUBISHI Dig./Ana.INTERFACE M62240FP SINGLE CHIP BATTERY CHARGER CONTROL IC EXPLANATION OF TERMINALS Function Pin No. Symbol 3 LED 4, 5 Rc, Cc 6 Chg SW 7 GND 8 Batt SW Checking whether a bettery is mounted or not. (It has a pull-up resistor) 9 VTR SW Detecting VTR connection. (It has a pull-up resistor) 10 Test 11 Batt + This is connected to the + terminal of the battery. 12 Batt - This is connected to the - terminal of the battery. 14 Batt T This is connected to the the temperature detecting terminal of the battery. 13 Vref2 The voltage reference terminal for temperature detection. 15 P.C 16 V DET Monitoring the output voltage. 18 I DET Detecting the charging current or output current. 19 OC SET Setting the over-current detection value in the adapter mode. 20, 1 Iset1, 2 These are used to the charging current. (Iset1 is for quick charge and Iset2 is for trickle charge) 2 Vref1 17 Vcc LED drive (Open collector outputs) Setting the oscillating frequency of the internal clocks. The SW drive terminal used for charging battery. (Open collector outputs) Ground Test mode set-up. (It has a pull-up resistor) This is connected to the photo-coupler used for feedback. (It has a pull-up resistor) Setting the standard voltage for over-current set-up value and the charge current set-up. Power supply. (2/ 6) 9703 MITSUBISHI Dig./Ana.INTERFACE M62240FP SINGLE CHIP BATTERY CHARGER CONTROL IC ABSOLUTE MAXIMUM RATINGS (Ta=25°C, unless otherwise noted) Symbol Ratings Unit 16 V IChgSW ChgSW terminal drive current 50 mA ILED LED drive current 20 mA I P.C P.C drive current 20 mA Iref1 Vref1 output current -0.5 mA Iref2 Vref2 output current -1 mA Pd Power dissipation 650 mW K Thermal derating Ta=25°C 6.5 mW/°C Topr Operating temperature Ta>25°C -20 to +75 °C Tstg Storage temperature -40 to +125 °C Vcc Parameter Conditions Supply voltage Note Polarity of current: The direction of current flowing into the IC is equivalent to the positive (+). The direction of current flowing out of the IC is equivalent to the negative (-). The voltage applied to the open collector output terminal should be less than the absolute maximum voltage of the power supply. The voltage difference between the negative terminal of the battery and the GND terminal should be 0 to 0.6V. (3/ 6) 9703 MITSUBISHI Dig./Ana.INTERFACE M62240FP SINGLE CHIP BATTERY CHARGER CONTROL IC ELECTRICAL CHARACTERISTICS (Vcc=7V,Ta=25°C,unless otherwise noted) All device Symbol Parameter Vcc Supply voltage Icc Circuit current Test conditions Min Limits Typ 3.0 Vcc=7V when quick charge VTHVCC Power supply detecting voltage Max Unit 15.0 V 10.0 20.0 30.0 mA 2.70 2.80 2.90 V Max 1.30 1.87 Reference Vref1 Vref1 output voltage Iref1=150µA Limits Min Typ 1.21 1.25 Vref2 Vref2 output voltage Iref2=350µA 1.73 Symbol Parameter Symbol Test conditions Parameter Test conditions IOCSET OCSET terminal flow out current VOCSET=220mV ISET1-1 ISET1 terminal flow out current 1 Excluding charging time ISET1-2 ISET1 terminal flow out current 2 When charging ISET2-1 ISET2 terminal flow out current 1 Excluding trickle charging time ISET2-2 ISET2 terminal flow out current 2 When trickle charging Min 1.80 Limits Typ Max -1 30 V V Unit µA 50 85 -1 30 Unit µA µA 50 85 -1 µA µA Driver Symbol Parameter Test conditions Min Limits Typ Max Unit VsatChgSW ChgSW terminal output flow out current IChgSW=30mA 0.3 0.6 V VsatLED LED output low voltage ILED=10mA 0.3 0.6 V Limits Typ Max Control Section Symbol Parameter Test conditions Min VIN Range of input voltage 0 IBias Input bias current -1 VPCL P.C output low voltage IP.C=10mA Vcc Unit V µA 0.3 0.6 V Each SW Detection Terminal Symbol IBattSW Parameter Test conditions Batt SW terminal flow out current Vcc=7V,VBattSW=0V VTHBatt Batt SW terminal threshold voltage IVTRSW VTR SW terminal flow out current Vcc=7V Vcc=7V,VVTRSW=0V VTHVTR VTR SW terminal threshold voltage Vcc=7V (4/ 6) Limits Min Typ -240 -140 3.0 4.0 -240 -140 3.0 4.0 Max -80 5.0 -80 5.0 Unit µA V µA V 9703 MITSUBISHI Dig./Ana.INTERFACE M62240FP SINGLE CHIP BATTERY CHARGER CONTROL IC Internal Voltage Set-up Symbol Parameter Test conditions Min Limits Typ Max Unit VVTR Set-up output voltage at VTR mode 828 864 900 mV VCHG Set-up output voltage at charge mode 1.21 1.26 1.30 V VISET1 Iset1 set-up voltage When quick charging 124.8 130 135.2 mV VISET2 Iset2 set-up voltage When trickle charging 11.52 12.0 12.48 mV VOCSET OCSET set-up voltage When VTR mode 211.2 220 228.8 mV VCHG Voltage at the start of quick charging 0.40 0.54 0.68 V VOVP Over-voltage set-up voltage 0.91 0.95 0.99 V V- ∆V -∆V detection set-up voltage 70 100 130 mV 0.91 0.97 1.01 V 0.82 0.86 0.90 V after initialization timer has passed VVTHH1 Temperature detection set-up voltage VO/H Temperature at the start of charging Over-heating detection set-up voltage Charge stop temperature Internal Voltage Set-up Symbol Parameter Test conditions Min Limits Typ Max Unit fosc Oscillation frequency Rc=30KΩ,Cc=2200pF 9.42 10.24 11.06 KHz Tm1 Initialization timer 1 Battery voltage < 5V 18.4 20.0 21.6 min Tm2 Initialization timer 2 Battery voltage ≥ 5V 4.6 5.0 5.4 min Tms1 Safety timer 1 When quick charging 4.6 5.0 5.4 hr Tms2 Safety timer 2 When trickle charging 4.6 5.0 5.4 hr Toc Over-current detection time When VTR mode 9.2 10.0 10.8 sec Note: Each timer is set at an oscillation frequency of 10.24KHz. (5/ 6) 9703 LED1 (6/ 6) 30K Cc 2200P 5 4 Rc Cc Rc 2 R12 4.4K R11 20.6K 19 R13 11.26K Vref1 OCSET 1 R15 120 R14 1.12K 20 10 N.C ISET1 ISET2 Test M62240FP VDET P.C Vcc CP2 CP1 16 P.C 15 R1 R3 1.2K 17 C2 3 C1 (CHARGE LED) D1 R2 8.8K 7 GND R4 18 T 14 12 11 6 VTR SW 9 Batt SW 8 R8 D2 R5 SW3 SW2 3K 9K R9 1K R6 R10 Q1 Vref2 13 Batt Batt Batt Chg SW IDET 0.1Ω T To Battery To VTR MITSUBISHI Dig./Ana.INTERFACE M62240FP SINGLE CHIP BATTERY CHARGER CONTROL IC APPLICATION EXAMPLE 9703