LM5175RHFT

Overview

The LM5175RHFT is a synchronous four-switch buck-boost DC/DC controller manufactured by Texas Instruments. It operates with an input voltage range of 3.5 V to 42 V, supporting a maximum of 60 V. The device regulates output voltages from 0.8 V to 55 V and supports up to 20 A output current. It features an adjustable switching frequency between 100 kHz and 600 kHz, which can be synchronized to an external clock. The component is housed in a 28-VQFN (5x4) package and is designed for operation across a temperature range of -40°C to 125°C TJ.

Feature Summary

• Synchronous four-switch topology enables efficient buck, boost, and bypass operations across wide input-output voltage differentials.
• Integrated 2 A MOSFET gate drivers provide robust control for external power stages.
• Flexible protection suite includes cycle-by-cycle current limiting, input UVLO, output OVP, and thermal shutdown.
• Supports continuous conduction mode (CCM) or discontinuous conduction mode (DCM) with optional spread spectrum for EMI reduction.

Applications

• Automotive start-stop systems
• USB Power Delivery (PD) sources and sinks
• Industrial PC power supplies
• LED lighting drivers

Procurement Notes

Verify the specific suffix RHFT corresponds to the 28-VQFN (5x4) package configuration. Confirm that the ordering part number matches the required tape and reel quantity specified in the manufacturer's official documentation. Ensure compatibility with the intended PCB footprint and thermal requirements for the QFN form factor.

Selection Notes

Select this controller when designing systems requiring regulation across both buck and boost regions with a single inductor. It is suitable for applications needing high efficiency over wide input voltage variations. Consider the 28-VQFN package for space-constrained designs requiring effective thermal dissipation through the exposed pad.

Part Context

This component belongs to the LM5175 family of wide VIN synchronous buck-boost controllers. The RHFT suffix denotes the specific tape-and-reel packaging variant of the device. It shares core functional specifications with other LM5175 variants but differs in physical packaging and shipping format.

Replacement Considerations

LM5175QPWPRQ1: Automotive-grade alternative with HTSSOP-28 package.

FAQ

What is the maximum input voltage supported by the LM5175?

The device supports a wide input voltage range of 3.5 V to 42 V, with a maximum rating of 60 V.

Does the LM5175 support frequency synchronization?

Yes, the switching frequency can be programmed via an external resistor and synchronized to an external clock signal.