MB3776A

FUJITSU SEMICONDUCTOR DATA SHEET DS04-27201-3E ASSP For Power Supply Applications Switching Regulator Controller MB3776A s DESCRIPTION MB3776A is a PWM system switching regulator controller. Because of its low operating supply voltage and powerdown, the MB3776A is ideal for use in DC/DC converters for battery-powered portable equipment. s FEATURES Wide supply voltage range: (2 V to 15 V) Wide oscillation frequency range, high-frequency oscillation: (10 kHz to 500 kHz) Push-pull output. Drive current set with external resistor Bulit-in idle period circuit Internally set error amplifier gain, few external components Bulit-in power-down function s PACKAGES 8-pin Plastic DIP 8-pin Plastic SOP 8-pin Plastic SOL 8-pin Plastic SSOP (DIP-8P-M01) (FPT-8P-M01) (FPT-8P-M02) (FPT-8P-M03) MB3776A s PIN ASSIGNMENT (TOP VIEW) –IN 1 8 FB CLT 2 7 OSC V CC 3 6 GND IB 4 5 OUT (DIP-8P-M01) (FPT-8P-M01) (FPT-8P-M02) (FPT-8P-M03) 2 MB3776A s BLOCK DIAGRAM VCC 3 OSC 7 IS 0.6 V IB CTL 2 Reference voltage 1.25 V Internal bias & reference voltage Error Amp. 0.1 V Saw–tooth waveform 0.1 V P. W. M. Comp Is 30 kΩ 5 OUT –IN 1 – X 100 36 kΩ – + 470 Ω 0.5 V + + Output drive control 4 IB D. T. C. ( 0.6 V) FB 8 6 GND 3 MB3776A s ABSOLUTE MAXIMUM RATINGS (Ta = +25°C) Parameter Power supply voltage Error amp. input voltage Output source current Output sink current Symbol VCC VI ISOURCE ISINK Condition — — — — Ta ≤ +25°C (DIP) Power dissipation PD...