SC4612MLTRT

Overview

The SC4612MLTRT is a high-performance synchronous buck switching controller manufactured by Semtech Corporation. It features a wide input voltage range with VDD up to 28V and VPWRIN up to 40V, supporting output voltages as low as 0.5V. The device provides 1.7A gate drive capability and supports programmable switching frequencies up to 1.2 MHz. It incorporates an asynchronous soft-start mode and low-side RDS-ON sensing with hiccup mode current limit. The component is available in MLPD-12 packages.

Feature Summary

• Synchronous rectified buck topology optimized for high efficiency
• Asynchronous soft-start mode prevents bus discharge during startup
• Low-side RDS-ON sensing with hiccup mode current limit
• Programmable switching frequency up to 1.2 MHz

Applications

• Distributed power architectures
• Telecommunication equipment
• Servers and workstations
• Base station power management
• Point-of-use low voltage high current applications

Procurement Notes

Verify the specific package variant against the datasheet, as the SC4612 series includes both MLPD-12 and SOIC-14 lead-free options. Confirm RoHS compliance status directly with the manufacturer or authorized distributors. Ensure the selected part number matches the required thermal and electrical specifications for the target application design.

Selection Notes

Select this controller for applications requiring wide input supply ranges and low output voltages down to 0.5V. The asynchronous soft-start feature is critical when powering converters into preset external voltages or pre-biased outputs to prevent latch-up. Consider the 1.7A gate drive capability for driving external MOSFETs efficiently.

Part Context

The SC4612MLTRT belongs to the SC4612 family of synchronous buck controllers from Semtech. This family is designed for mixed-signal applications and point-of-use regulation. The MLTRT suffix typically indicates the MLPD-12 package configuration with reel packaging, distinguishing it from other variants like the SOIC-14 versions.

Replacement Considerations

SC4612HMLTRT

FAQ

What is the purpose of the asynchronous soft-start mode?

It keeps the lower side MOSFET off during soft-start to prevent external bus discharge and avoid disturbances or latch-up in modern ASIC circuits.

How does the SC4612 handle overcurrent conditions?

It utilizes low-side RDS-ON sensing combined with a hiccup mode current limit to protect the system.