SG1577ASY

Overview

The SG1577ASY is a dual synchronous DC/DC controller manufactured by onsemi, formerly Fairchild. It integrates two independent PWM controllers and MOSFET drivers for high-efficiency voltage-mode regulation. The device features a programmable fixed-frequency oscillator ranging from 60kHz to 340kHz and an internal reference voltage of 0.7V±1.5%. It supports a maximum input supply voltage of 15V and offers programmable output down to 0.7V. Key protection functions include over-current protection (OCP) and over-voltage protection (OVP). The component includes two soft-start/enable functions and operates within a temperature range of -40°C to +105°C.

Feature Summary

• Integrates two independent PWM controllers with dedicated MOSFET drivers for dual-channel operation
• Features programmable constant frequency oscillator and internal error amplifier with precise reference
• Includes dual soft-start and enable functions for controlled startup and power management
• Provides built-in over-current and over-voltage protection mechanisms

Applications

• CPU and GPU Vcore Power Supply
• Power Supply Requiring Two Independent Outputs

Procurement Notes

Verify the specific ordering suffix 'ASY' against current manufacturer documentation to confirm package type and packing method. Note that this component may be subject to end-of-life status or limited availability; consult official distributors for current stock and lifecycle information before finalizing procurement plans.

Selection Notes

Select the SG1577ASY when designing systems requiring two isolated or non-isolated synchronous outputs with independent control. Ensure the design accommodates the 15V maximum input supply and utilizes external components for setting the switching frequency and current protection thresholds. Verify thermal requirements for the SOP-20 package in the target application environment.

Part Context

This part belongs to the SG1577 series of dual synchronous DC/DC controllers. Originally developed by Fairchild Semiconductor, the product line was integrated into onsemi's portfolio following corporate acquisitions. The series is designed for applications demanding efficient multi-rail power delivery with compact footprint solutions.

Replacement Considerations

Check for direct pin-compatible alternatives within the SG1577 family, such as the SG1577A, ensuring functional equivalence regarding driver integration and protection features. Verify package compatibility and electrical parameter alignment before substitution.