SG1526BJ-DESC

Overview

The SG1526BJ-DESC is a high-reliability isolated switching regulator controller from the SG1526B series, manufactured by Microchip Technology. It is designed for fixed-frequency switching regulators and power control applications. The device features an 18-pin CDIP package with through-hole mounting. Key electrical parameters include a maximum output current of 100 mA, a switch frequency range of 1 Hz to 500 kHz, and a maximum duty cycle of 49%. It operates within a temperature range of -55°C to +125°C and supports Buck and Flyback topologies.

Feature Summary

• High-reliability isolated switching regulator design
• Integrated pulse width modulation with shutdown capability
• Temperature compensated voltage reference and error amplifier
• Low impedance power drivers for direct MOSFET control

Applications

• Fixed-frequency switching power supplies
• Isolated flyback converter designs
• Buck converter architectures
• High-reliability industrial power control systems

Procurement Notes

Verify that the specific suffix 'DESC' aligns with your required isolation and reliability specifications, as it denotes a high-reliability variant. Confirm the 18-pin CDIP package compatibility with your PCB layout and assembly processes. Ensure the operating temperature range meets your environmental requirements. Cross-reference the datasheet for pinout details to avoid integration errors during schematic capture and board design phases.

Selection Notes

Select this component when high reliability and isolation are critical for the power supply application. It is suitable for designs requiring a wide input voltage range and precise duty cycle control up to 49%. Consider the 100 mA output drive capability for driving external power switches. Evaluate the thermal performance within the specified -55°C to +125°C range to ensure stable operation in harsh environments compared to standard commercial grade alternatives.

Part Context

The SG1526BJ-DESC belongs to the SG1526B family of monolithic pulse width modulators. This series offers improved functional and electrical characteristics over earlier generations. It integrates essential components such as a sawtooth oscillator, error amplifier, and pulse metering logic into a single chip. The device is widely used in professional power electronics where robustness and long-term stability are prioritized over cost-sensitive consumer applications.

Replacement Considerations

Public confirmed substitute part numbers: SG1526BJ-883B.