SG1577SZ

DC DC Switching Controllers Overview

The SG1577SZ is a dual synchronous DC/DC controller manufactured by onsemi, belonging to the SG1577 series. It integrates two independent PWM controllers and MOSFET drivers for high-efficiency voltage-mode regulation. The device supports fixed-frequency operation with a programmable range from 61kHz to 340kHz. It features an internal reference voltage of 0.7V ±1.5% and allows output voltages as low as 0.7V. The component includes soft-start capabilities, programmable over-current protection, and over-voltage protection. It operates within a supply voltage range up to 15V and is housed in a 20-pin SOP package.

DC DC Switching Controllers Feature Summary

• Integrates two independent PWM controllers and MOSFET driver sets for dual-channel synchronous rectification
• Features programmable constant frequency operation ranging from 61kHz to 340kHz
• Includes internal error amplifier with 0.7V reference and dual soft-start/enabling functions
• Provides programmable over-current protection and over-voltage protection mechanisms

DC DC Switching Controllers Applications

• CPU and GPU Vcore power supplies
• Power systems requiring two independent regulated outputs
• High-efficiency synchronous DC/DC conversion stages

DC DC Switching Controllers Procurement Notes

Verify the specific suffix 'SZ' against official onsemi documentation to confirm package type and tape/reel specifications. Confirm current availability status as distribution channels may list this part as discontinued or limited supply. Ensure compatibility with existing 20-pin SOP footprints during procurement planning.

DC DC Switching Controllers Selection Notes

Select this component when designing dual-output synchronous buck converters requiring independent phase control. It is suitable for applications needing precise voltage regulation with integrated drive capabilities. Consider the programmable frequency range and soft-start features for system stability requirements.

DC DC Switching Controllers Part Context

The SG1577 series represents a family of dual synchronous DC/DC controllers designed for high-performance power management. Originally developed by Fairchild Semiconductor, the product line was acquired by onsemi. The SG1577SZ variant specifically denotes the commercial grade version packaged in a 20-lead Small Outline Package (SOP).

DC DC Switching Controllers Replacement Considerations

The SG1577A is a documented equivalent within the same functional family. Verify pinout compatibility and electrical parameter alignment before substitution.