Bipolar IC For Switching Power Supply Control FA7630CP(E) FA7630CP(E) ■ Description ■ Dimensions, mm The FA7630CP(E) is dual channel PWM-type switching power supply control IC. This IC can drive Pch-MOSFET directly and is optimum for large power DC-DC converter. This IC has all the necessary protection functions for a power MOSFET. It is optimum for a portable equipment power supply which uses low-voltage input to output comparably large power. Á SSOP-20 5.3 7.9±0.3 11 20 ■ Features 0~10˚ 0.3 2.1max 7.2 +0.1 0.2 –0.05 10 1 0.1±0.1 0.65 0.6 Á DIP-20 11 20 6.4 • Dual channel PWM-type switching power supply control • ±2.6% (VREF) and ±3% (VB ) reference voltage • Low voltage operation (Vcc: 5 to 20V) • Drive circuit for connecting a Pch-MOSFET • Overload cutoff circuit with timer latch circuit • Soft start circuit • Undervoltage lockout function (UVLO) • Pulse-by-pulse overcurrent limiting function • Output ON/OFF control function for each channel • Master-slave synchronized operation without external components • Maximum operating frequency is 500kHz 10 24.4 1.52 0.51min 3.6 0.77 2.54min 5.1max 1 0.46±0.1 2.54±0.25 +0.1 5 –0.0 0.25 7.62 0~15 ˚ 5˚ 0~1 ■ Block diagram Pin No. Pin symbol Description 1 CT Oscillator timing capacitor 2 RT Oscillator timing resistor 3 ON/OFF2 Output ON/OFF control 2 IN2+ Non-inverting input to error 4 amplifier 1 5 IN2– Inverting input to error amplifier 6 FB2 Error amplifier output 7 DT2 Dead time adjustment 8 Overcurrent limiting circuit 2 9 OCL2 GND 10 OUT2 CH.2 output 11 OUT1 CH.1 output 12 VCC Power supply 13 OCL1 DT1 Overcurrent limiting circuit 14 15 FB1 Error amplifier output 16 IN1+ Non-inverting input to error amplifier 17 ON/OFF1 Output ON/OFF control 1 18 Synchronizing signal input 19 SYNC IN CP 20 REF Reference voltage output Ground Dead time adjustment Timer and latch circuit FA7630CP(E) ■ Absolute maximum ratings ■ Recommended operating conditions Item Symbol Rating Unit Item Symbol Min. Max. Unit Maximum supply voltage VCC IOUT Pd TJ 22 V Supply voltage 5 20 V ±500 mA Feedback resistance 650 mW Oscillator timing capacitance 125 °C Oscillator timing resistance VCC RNF CT RT Topr Tstg –20 to +85 °C Oscillation frequency fOSC –40 to +150 °C Maximum output current Maximum power dissipation Junction temperature Operating temperature Storage temperature 100 kΩ 50 2200 pF 24 100 kΩ 50 500 kHz ■ Electrical characteristics (Ta=25°C, VCC=6V, CT=180pF, RT=47kΩ) Reference voltage section Item Symbol Test condition Min. Typ. Max. Unit Output voltage VREF LINE IOR = 1mA VCC = 5.0 to 20V 2.450 2.520 2.580 V 5 20 mV Line regulation Load regulation Output voltage variation due to temperature change LOAD VTC1 VTC2 IOR=1mA IOR = 0.1 to 1mA 50 mV Ta = –20 to +25°C –1 30 1 % Ta = +25 to +85°C –1 1 % Unit Oscillation and synchronizing circuit section Item Symbol Test condition Min. Typ. Max. Oscillation frequency fOSC fdV fdT CT=180pF, RT=47kΩ VCC = 3.6 to 20V 74 83 92 Frequency variation(due to supply voltage change) Frequency variation(due to temperature change) Ta = –20 to +85°C VSYH VSYL VSD ISYNC VSYNC=1.6V Item Symbol Test condition Reference voltage VB IB AVO fT H level of synchronizing signal L level of synchronizing signal Cutoff level of synchronizing signal Bias current of synchronizing signal 1 kHz % 5 % 1.5 1.8 V 0.8 1.1 V 0.4 V 5 µA Error amplifier section (Ch.1) Input bias current Open-loop voltage gain Unity-gain bandwidth Min. Typ. Max. Unit 0.769 0.793 0.817 V 5 100 VOH VOL IOH No load VOH=1V 40 Item Symbol Test condition Min. Input offset voltage VIO Input bias current IB VCOM AVO fT VOH H state output voltage L state output voltage Output source current nA 60 dB 1 MHz 2.10 V No load 55 300 mV 100 µA Error amplifier section (Ch.2) Common-mode input voltage Open-loop voltage gain Unity-gain bandwidth H state output voltage L state output voltage Output source current VOL IOH Typ. Max. Unit 2 10 mV 5 100 nA 1.0 V 0 70 dB 1.0 No load V No load VOH=1V MHz 2.10 50 65 300 mV 200 µA 2 FA7630CP(E) Pulse width modulation circuit section (FB pin) Item Symbol Test condition Input threshold voltage VTHO VTH1 Duty cycle = 0% 1.65 V Duty cycle = 100% 0.95 V Item Symbol Test condition Input threshold voltage VTHO Duty cycle = 0% Input threshold voltage VTH1 VSTB Duty cycle = 100% Item Symbol Test condition Input threshold voltage VTHOC VHYOC IOC tdoc Overdriving : 50mV Item Symbol Test condition Latch-mode threshold voltage VTHCP IINCP VSATC VCP =1.5V, VFB=0.3V ICP =20µA, VFB=1.0V Item Symbol Test condition OFF-to-ON threshold voltage ON-to-OFF threshold voltage VTHON VTHOF Input bias current IIN VIN =3V Item Symbol Test condition OFF-to-ON threshold voltage VCCON ON-to-OFF threshold voltage VCCOF VHYS Input threshold voltage Min. Typ. Max. Unit Dead time adjustment circuit section (DT pin) Standby voltage DT pin open Min. Typ. Max. Unit 1.65 V 0.95 V 1.80 V Overcurrent limiting circuit section Hysteresis voltage Input bias current Delay in OCL Min. Typ. Max. Unit 175 200 225 mV 40 45 mV 80 120 µA ns Timer and latch circuit section Input bias current CP pin voltage / LOW Min. Typ. Max. Unit 1.00 1.25 1.50 V 1 µA 300 mV Output ON/OFF control section Min. Typ. Max. Unit 3.0 V 0.60 V 230 350 µA Undervoltage lock-out circuit section Voltage hysteresis Min. Typ. Max. Unit 3.92 4.20 4.48 V 3.50 V 0.70 V Output section Item Symbol Test condition Saturation voltage(H level) VSAT+ VSAT– IO= –50mA IO= 50mA Item Symbol Test condition Typ. Max. Unit Standby supply current ICCST ICC1 Out pin open 0.1 10 µA Single channel operation 2.20 3.20 mA 3.00 4.20 mA Saturation voltage(L level) Min. Typ. Max. Unit 1.60 2.00 V 1.40 1.80 V Overall device Operating-state supply current Min. Duty cycle =50% ICC2 Dual channel operation Duty cycle =50% 3 FA7630CP(E) ■ Application circuit Á Individual application circuit 4 FA7630CP(E) Á Master-slave application circuit Parts tolerances characteristics are not defined in the circuit design sample shown above. When designing an actual circuit for a product, you must determine parts tolerances and characteristics for safe and economical operation. 5