Bipolar IC For Switching PowerFA7616CP(E)(V) Supply Control FA7616CP(E)(V) ■ Description ■ Dimensions, mm The FA7616CP(E)(V) is a bipolar control IC having two channels of PWM-type switching regulator control circuits. With this IC, a DC-to-DC converter can be easily implemented for a minimum input voltage of 1.4V. Á TSSOP-16 9 16 0~10˚ +0.08 1.2max 8 5.0±0.1 ■ Applications • Battery power supply (two, 1.5V batteries) for portable equipment +0.05 1 0.1±0.1 • Input voltage from 1.4V (VCC = 1.4 to 12V) • Open-collector output • Wide operating frequency range (fOSC: 10 to 500kHz) • Output ON/OFF control function • Not many external discrete components are needed 0.15 –0.06 4.4±0.1 6.4±0.2 ■ Features 0.6 0.65 0.24 –0.07 Á SSOP-16 ■ Block diagram 9 0.65 2.1max 0~10˚ 0.3 +0.1 8 6.2 0.1±0.1 1 0.2 –0.05 5.3 7.9±0.3 16 0.6 Á DIP-16 16 6.5 9 Pin symbol Description 1 VCC2 CT IN2 (+) IC main power supply IN2 (–) FB2 DT2 OUT2 GND Inverting input to error amplifier OUT1 DT1 FB1 IN1 (–) CST CH. 1 Output VCC1 ON/OFF REF Start-up circuit power supply 3 4 5 6 7 8 9 10 11 12 13 14 15 16 1.5 3.4 0.81 Oscillator timing capacitor Non-inverting input to error amplifier Error amplifier output 8 19.4 0.2min 2 1 2.54±0.25 0.5±0.1 3.1min 4.3max Pin No. +0.1 5 .0 0.3 –0 7.6 0~15 ˚ 5˚ 0~1 Dead time adjustment CH. 2 Output Ground Dead time adjustment Error amplifier output Inverting input to error amplifier Start-up circuit timing capacitor Output ON/OFF control Reference voltage output (1.20V) 1 FA7616CP(E)(V) ■ Absolute maximum ratings Item Symbol VCC Reference voltage output current IOR Output sink current IO Total power dissipation Pd Supply voltage Operating temperature Storage temperature Topr Tstg ■ Recommended operating conditions Rating Unit Item 12 V Supply voltage 1 Symbol VCC1 Supply voltage 2 VCC2 Output sink current (at start-up) ISINK Output sink current ISINK 5 mA 10 mA 300 mW –20 to +85 °C (at steady state) –40 to +150 °C Oscillation frequency Oscillator timing capacitor (start-up circuit) Oscillator timing capacitor Oscillator timing resistance Feedback resistance Min. Max. Unit 1.4 12 V 2.5 12 V 3 mA 5 mA fOSC CST 10 500 kHz 47 10,000 pF CT RT RNF 220 10,000 pF 4.7 47 kΩ 100 kΩ ■ Electrical characteristics (Ta = 25°C, VCC1 = 1.6V, V CC2 = 3V, V15 = 2V, CT = 1000pF, RT = 10kΩ) Reference voltage section Item Symbol Test condition Min. Typ. Max. Unit Output voltage VREF IOR = 0.1mA 1.196 1.220 1.244 V Line regulation V CC = 2.5 to 12V, V15 = 2V fixed IOR = 0.1 to 1mA 1 8 mV Load regulation LINE LOAD 1 8 mV Output voltage variation due to temperature change VTC1 Ta = –20 to +25°C IOR = 0.1mA –2 –0.3 1 % VTC2 Ta = +25 to +85°C IOR = 0.1mA –2 –0.6 1 % Item Symbol Test condition Min. Typ. Max. Unit Oscillation frequency fOSC fdV fdT CT = 1000pF, RT = 10kΩ VCC = 2.5 to 12V 80 92 110 kHz 1 3 % Item Symbol Test condition Input offset voltage VIO IB VCM AV Oscillator section Frequency variation 1 (due to supply voltage change) Frequency variation 2 (due to temperature change) Ta = –20 to +85°C 2 % Error amplifier section Input bias current Common-mode input voltage Open-loop voltage gain Min. Typ. Max. Unit 2 10 mV 1 µA VCC2 –1.7 V 0 70 dB GB VOM+ VOM– IOM+ RNF = 100kΩ RNF = 100kΩ VOM = 1V Item Symbol Test condition Input threshold voltage VTH0 VTH100 Duty cycle = 0% 0.80 V Duty cycle = 100% 1.45 V Unity-gain bandwidth Maximum output voltage Output source current 1.0 MHz VCC2–0.5 40 V 200 mV 85 170 µA Typ. Max. PWM comparator section Input threshold voltage 2 Min. Unit FA7616CP(E)(V) Dead time adjustment circuit section Item Symbol Test condition Min. Typ. Input threshold voltage VTH DT0 VTH DT100 Duty cycle = 0% 0.08 0.15 Item Symbol Test condition ON/OFF threshold voltage VTH ON II ON Pin 15 = 2V Item Symbol Test condition Oscillation frequency fSC CST = 1000pF, VCC2 = 0.5V 70 95 115 kHz ON duty cycle DST VCC2 TH CST = 1000pF, VCC2 = 0.5V 40 50 60 % ON-to-OFF threshold voltage 2.15 at start-up circuit 2.30 2.45 V Item Symbol Test condition Typ. Output leakage current ILEAK VO = 12V L-level output voltage VOL Output sink current =5mA Item Symbol Test condition Typ. Max. Unit Standby current 1 ICC ST1 Pin 15 = 0V or VCC2 > 2.45V 0.1 10 µA Standby current ICC STAR ICC ST2 ICC AV Pin 15 = 2V, VCC2 < 2.15V 400 800 µA Pin 15 = 0V, VCC2 = 3V 0.4 0.7 mA Pin 15 = 2V, VCC2 = 3V 2.2 3.2 mA Input threshold voltage Duty cycle = 100% 0.80 Max. Unit V 0.95 V Output ON/OFF circuit section Input current Min. Typ. Max. Unit 0.5 0.9 1.2 V 650 850 µA Typ. Max. Unit Start-up circuit section Threshold voltage to stop Min. Output section Min. 0.25 Max. Unit 5 µA 0.55 V Overall device Standby current 2 Operating-state supply current Min. ■ Characteristic curves (Ta = 25°C) Oscillation frequency (fOSC ) vs. timing capacitor capacitance (CST) and output duty cycle At strat-up state Oscillation frequency (fOSC) vs. timing capacitor capacitance (CT) At steady state 3 FA7616CP(E)(V) Output duty cycle vs. FB terminal voltage (VFB) L-level output voltage (VO1L) vs. CH. 1 output sink current (ISINK1) At start-up state L-level output voltage (VOL) vs. output sink current (ISINK) At steady state Supply current (ICC) vs. supply voltage (VCC) Error amplifier frequency (f) vs. voltage gain (AV) VOL [V] Output duty cycle vs. DT terminal voltage (VDT) 4 FA7616CP(E)(V) ■ Application circuit Á Flyback-transformer type and chopper type boost converter 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. Please connect a capacitor, which the value is about 0.01 µF to 0.1µF, between VCC and REF terminals in order to prevent from irregular output pulse at start-up. 5