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SG1577SY
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Product Detailed Parameters
- Description：DUAL SWITCHING CONTROLLER, VOLTA
- Series：-
- Mfr：Fairchild Semiconductor
- Package：Bulk
- 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 SG1577SY is a dual synchronous DC/DC PWM controller manufactured by Fairchild Semiconductor. It features two independent channels operating out of phase, with integrated MOSFET drivers and a fixed-frequency oscillator programmable from 60kHz to 340kHz. The device includes an internal error amplifier with a reference voltage of 0.7V±1.5%, programmable output down to 0.7V, and over-current protection. It operates within a supply voltage range up to 15V and supports soft-start or enable functions. The component is housed in a 20-lead Small Outline Package (SOP) and is rated for an operating temperature range of -40°C to +105°C.
Feature Summary
- Dual-channel architecture with integrated MOSFET drivers for independent outputs
- Programmable switching frequency ranging from 60kHz to 340kHz
- Integrated over-current protection and over-voltage protection mechanisms
- Soft-start capability that also serves as a chip-enable function
Applications
- CPU Vcore power supply
- GPU Vcore power supply
- Power supplies requiring two independent outputs
Procurement Notes
Verify the specific suffix 'SY' against the manufacturer's official documentation to confirm package type and tape & reel packing method. Ensure the part number matches the required operating temperature range of -40°C to +105°C. Cross-reference the manufacturer designation, noting potential transitions from Fairchild Semiconductor to ON Semiconductor, to guarantee component authenticity and correct sourcing channels.
Selection Notes
Select this controller for applications requiring high-efficiency voltage-mode regulation with two isolated outputs. The device is suitable where out-of-phase operation reduces input ripple current. Consider the programmable frequency range when designing external timing components. Verify that the 15V maximum input supply voltage aligns with the system design constraints and that the SOP-20 package fits the available PCB footprint.
Part Context
The SG1577 series comprises dual synchronous DC/DC controllers designed for multi-output power management. The SG1577SY variant specifically denotes the version packaged in a 20-lead Small Outline Package (SOP). This family targets efficient power conversion in computing and communication equipment, providing integrated control logic and driver stages to minimize external component count.
Replacement Considerations
Consult official substitution guides for equivalent dual-channel synchronous controllers. Verify pin compatibility and electrical specifications before replacing the SG1577SY with alternative part numbers.
