SG1577A Datasheet | Fairchild Semiconductor

atures - - - - - - - - - - - Integrated Two Sets of MOSFET Drivers Two Independent PWM Controllers Constant Frequency Operation: Free-running Fixed Frequency Oscillator Programmable: 61k Hz to 340k Hz Maximum Input Supply Voltage: 15V Programmable Output as Low as 0.7V Internal Error Amplifier Reference Voltage: 0.7V±1.5% Two Soft-Start / EN Functions Programmable Over-Current Protection (OCP) 30V HIGH Voltage Pin for Bootstrap Voltage Output Over-Voltage Protection (OVP) 20-Pin SOP Description The SG1577A is a high-efficiency, voltage-mode, dualchannel, 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±1.5%. It is connected to the error amplifier’s positive terminal for voltage feedback regulation. The 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 0.7m A. The fixed-frequency is programmable from 60k Hz to 340k Hz. The Over-Current Protection (OCP) level can be programmed by an external current sense resistor. It has two integrated sets of internal MOSFET drivers. SG1577A is available in a 20-pin SOP package. Applications - - CPU and GPU Vcore Power Supply Power Supply Requiring Two Independent Outputs Ordering Information Part Number SG1577ASY Operating Temperature Range -40°C to +105°C Eco Status Green Package 20-Lead, Small Outline Package (SOP-20) Packing Method Tape & Reel For Fairchild’s definition of Eco Status, please visit: http://.fairchildsemi./pany/green/rohs_green.html. .. © 2009 Fairchild Semiconductor Corporation SG1577A - Rev. 1.0.0 .fairchildsemi. - Dual Synchronous DC/DC Controller Application...