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SG1577DY
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Product Detailed Parameters
- Description：DUAL SWITCHING CONTROLLER
- Series：-
- Mfr：Fairchild Semiconductor
- Package：Tube
- 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：Through Hole
- Package / Case：20-DIP (0.300", 7.62mm)
- Supplier Device Package：20-DIP
- Grade：-
- Qualification：-
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Overview
The SG1577DY is a dual synchronous DC/DC PWM controller designed for high-efficiency voltage-mode regulation of two independent outputs. It features integrated MOSFET drivers and operates out of phase to minimize input ripple. The device supports a programmable fixed-frequency oscillator ranging from 60kHz to 340kHz. An internal reference voltage of 0.7V±1.5% ensures precise feedback regulation. Maximum input supply voltage is rated at 15V, with output capability down to 0.7V. The component includes over-current protection (OCP) and over-voltage protection (OVP) mechanisms. Soft-start functionality allows gradual output voltage ramp-up or serves as an enable control.
Feature Summary
- Integrated dual-channel MOSFET drivers for synchronous rectification
- Programmable constant frequency operation between 60kHz and 340kHz
- Built-in soft-start circuitry supporting chip-enable functions
- Comprehensive protection including over-current and over-voltage limits
Applications
- CPU Vcore power supply systems
- GPU power delivery architectures
- Power supplies requiring two independent regulated outputs
Procurement Notes
Verify current availability status as the SG1577DY may be subject to limited supply conditions or end-of-life restrictions depending on the manufacturer's production schedule. Confirm package type compatibility, specifically the 20-lead DIP configuration, against PCB footprint requirements. Ensure that the operating temperature range meets the specific environmental constraints of the target application before finalizing procurement decisions.
Selection Notes
Select this controller for applications demanding dual isolated or non-isolated synchronous buck topologies. The out-of-phase operation reduces input capacitor stress compared to in-phase designs. Consider the 0.7V reference accuracy for tight load regulation requirements. Evaluate the external resistor network needed to set the switching frequency within the specified 60kHz to 340kHz window based on magnetic component size constraints.
Part Context
The SG1577 series belongs to Fairchild Semiconductor's portfolio of power management ICs focused on multi-output DC/DC conversion. This specific part integrates control logic and gate drivers into a single package, simplifying design complexity. It is often utilized in computing hardware where stable, low-voltage power rails are critical for processor stability and performance under varying load conditions.
Replacement Considerations
Check for direct pin-compatible alternatives within the same family if supply is constrained. Verify that any substitute maintains the 20-pin SOP/DIP form factor and identical electrical characteristics regarding the 0.7V reference and frequency range.
