SG1845L-DESC

Overview

The SG1845L-DESC is a high-reliability switching controller manufactured by Microchip Technology, designed for current-mode PWM applications. It supports flyback topology with one output and operates within a switching frequency range of 100 Hz to 500 kHz. The device features a maximum duty cycle of 50% and an output current capacity of 1 A. It functions reliably across an extended temperature range from -55°C to +125°C. The component utilizes a CQCC20 LCC-20 package and is suitable for surface mount installation.

Feature Summary

• Supports current-mode pulse width modulation control for precise regulation
• Designed for high-reliability isolated switching regulator applications
• Capable of driving loads up to 1 A output current
• Operates effectively in extreme environmental conditions

Applications

• High-reliability isolated switching regulators
• Flyback converter designs requiring current-mode control
• Industrial power supplies operating in harsh environments
• Aerospace and defense electronic systems

Procurement Notes

Verify the specific suffix designation against official Microchip documentation to confirm package type and qualification level. Ensure that the ordering information matches the required military or industrial standards. Confirm availability through authorized channels as this may be a special order item. Cross-reference the datasheet version to ensure compatibility with current design requirements.

Selection Notes

Select this component when designing flyback converters that require robust current-mode control in demanding thermal environments. It is appropriate for applications needing high reliability and wide input voltage tolerance. Consider the CQCC20 package constraints for PCB layout. Verify that the 500 kHz maximum switching frequency aligns with system performance goals.

Part Context

This part belongs to the SG1845 series of switching controllers, which are known for their durability in critical applications. The SG1845L variant specifically denotes a leaded package configuration compared to other surface-mount options in the family. It serves as a core control element in power management circuits where stability and longevity are paramount.

Replacement Considerations

Public confirmed substitute part numbers: SG1845F-DESC, SG1845J-TR.