SC4812STRT

Overview

The SC4812 is a highly integrated current mode PWM controller designed for isolated or non-isolated DC-DC converters in telecommunication and data communication applications. It minimizes external discrete components, reducing cost and space. Key features include a wide input range of 12V to 90V, a high-voltage start-up circuit, cycle-by-cycle current limit, programmable external soft-start, and thermal shutdown. The device utilizes a transconductance error amplifier and leading-edge blanking. It is available in an SO-8 package and is fully WEEE and RoHS compliant.

Feature Summary

• Highly integrated current mode PWM controller for DC-DC converters
• Wide input voltage range from 12V to 90V with high-voltage start-up
• Includes programmable external soft-start and thermal shutdown protection
• Minimizes external component count for cost and space savings

Applications

• IP phones and PoE applications
• Telecom isolated converters
• Off-line isolated power supplies
• Instrumentation power supplies
• Battery chargers

Procurement Notes

Verify the specific ordering code suffix (e.g., STRT vs IMLTRT) against the manufacturer's official datasheet to ensure correct packaging and compliance status. Confirm that the SO-8 package variant matches your PCB layout requirements. Ensure the selected part number aligns with the intended application voltage range and current control specifications documented in the official Semtech documentation.

Selection Notes

Select the SC4812 when designing isolated or non-isolated DC-DC converters requiring a wide input voltage range up to 90V. Its current mode control and integrated features reduce external component count, making it suitable for space-constrained designs in telecom and instrumentation. Consider its thermal shutdown and cycle-by-cycle current limit for robust protection in critical power supply applications.

Part Context

The SC4812 belongs to Semtech's portfolio of power management solutions tailored for telecommunications and data communication infrastructure. It complements other controllers like the SC4810 series by offering a streamlined solution for standard isolated converter topologies. The device supports efficient power conversion while maintaining compliance with environmental standards such as RoHS and WEEE.

Replacement Considerations

The SC4810A, SC4810B, SC4810AIMLTRT, and SC4810AITSTRT are related current mode PWM controllers from Semtech. Verify functional compatibility regarding output configuration and delay programming before substitution.