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SG1577A
Dual Synchronous DC/DC Controller
SG1577A — Dual Synchronous DC/DC Controller August 2010 SG1577A Dual Synchronous DC/DC Controller Features Description The SG1577A is a high-efficiency, voltage-mode, dual- Integrated Two Sets of MOSFET Drivers channel, synchronous DC/DC PWM controller for two Two Independent PWM Controllers independent outputs. The two channels are operated out of phase. The internal reference voltage is trimmed Constant Frequency Operation: Free-Running to 0.7V±1.5%. It is connected to the error amplifier’s Fixed Frequency Oscillator Programmable: positive terminal for voltage feedback regulation. 61kHz to 340kHz The soft-start circuit ensures the output voltage can be Maximum Input Supply Voltage: 15V gradually and smoothly increased from zero to its final Programmable Output as Low as 0.7V regulated value. The soft-start pin can also be used for chip-enable function. When two soft-start pins are Internal Error Amplifier Reference Voltage: grounded, the chip is disabled and the total operation 0.7V±1.5% current can be reduced to under 0.7mA. Two Soft-Start / EN Functions The fixed-frequency is programmable from 60kHz to Programmable Over-Current Protection (OCP) 340kHz. The Over-Current Protection (OCP) level can be programmed by an external current-sense resistor. It 30V HIGH Voltage Pin for Bootstrap Voltage has two integrated sets of internal MOSFET drivers. Output Over-Voltage Protection (OVP) SG1577A is available in a 20-pin SOP package. 20-Pin SOP Applications CPU and GPU Vcore Power Supply Power Supply Requiring Two Independent Outputs Ordering Information Part Number Operating Temperature Range Package Packing Method 20-Lead, Small Outline Package SG1577ASY -40°C to +105°C Tape & Reel (SOP-20) © 2009 SG1577A • Rev. 1.0.2
