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FAN1577AMX Datasheet(PDF) 1 Page - Fairchild Semiconductor |
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FAN1577AMX Datasheet(HTML) 1 Page - Fairchild Semiconductor |
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1 / 15 page  October 2010 © 2010 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN1577A • Rev. 1.0.0 FAN1577A Dual Synchronous DC/DC Controller Features Integrates Two Sets of MOSFET Drivers Two Independent PWM Controllers Constant Frequency Operation: Free-running Fixed- Frequency Oscillator Programmable: 61kHz to 340kHz Maximum Input Supply Voltage: 15V Programmable Output as Low as 0.7V Internal Error Amplifier Reference Voltage: 0.7V ±1.0% Two Soft-Start / EN Function Pins Programmable Over-Current Protection (OCP) 30V HIGH Voltage Pin for Bootstrap Voltage Output Over-Voltage Protection (OVP) 20-Pin SOP Applications CPU and GPU Vcore Power Supply Power Supply Requiring Two Independent Outputs Description The FAN1577A is a high-efficiency, voltage-mode, dual- channel, synchronous DC/DC PWM controller for two independent outputs. The two channels are operated out of phase. The internal reference voltage is trimmed to 0.7V±1.0%. It is connected to the error amplifier’s positive terminal for voltage feedback regulation. A soft-start circuit ensures the output voltage can be gradually and smoothly increased from zero to its final regulated value. The soft-start pin can also be used for chip-enable function. When two soft-start pins are grounded, the chip is disabled, and the total operation current can be reduced to under 0.7mA. The fixed-frequency is programmable from 61kHz to 340kHz. The Over-Current Protection (OCP) level can be programmed by an external current-sense resistor. It has two integrated sets of internal MOSFET drivers. FAN1577A is available in a 20-pin small-outline package (SOP). Ordering Information Part Number Operating Temperature Range Package Packing Method FAN1577AMX -40°C to +85°C 20-Lead, Small-Outline Package Tape & Reel |
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