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SG1577SZ
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Product Detailed Parameters
- Description：IC REG CTRLR BUCK/BOOST 20-SOP
- Series：-
- Mfr：onsemi
- Package：Tape & Reel (TR),Cut Tape (CT)
- Output Type：-
- Function：-
- Output Configuration：-
- Topology：-
- Number of Outputs：2
- Output Phases：-
- Voltage - Supply (Vcc/Vdd)：8V ~ 15V
- Frequency - Switching：-
- Duty Cycle (Max)：95%
- Synchronous Rectifier：-
- Clock Sync：-
- Serial Interfaces：-
- Control Features：-
- Operating Temperature：-40°C ~ 85°C (TA)
- Mounting Type：Surface Mount
- Package / Case：20-SOIC (0.295", 7.50mm Width)
- Supplier Device Package：20-SOIC
- Grade：-
- Qualification：-
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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.
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
Applications
- CPU and GPU Vcore power supplies
- Power systems requiring two independent regulated outputs
- High-efficiency synchronous DC/DC conversion stages
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.
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.
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).
Replacement Considerations
The SG1577A is a documented equivalent within the same functional family. Verify pinout compatibility and electrical parameter alignment before substitution.
