LM5176RHFT

Overview

The LM5176RHFT is a synchronous four-switch buck-boost DC/DC controller from Texas Instruments, designed for wide input voltage applications. It operates with an input voltage range of 6V to 55V and supports output voltages from 0.8V to 55V. The device features an adjustable switching frequency between 100kHz and 600kHz. It utilizes a 28-pin VQFN package (5x4mm) and is rated for junction temperatures from -40°C to +125°C.

Feature Summary

• Synchronous four-switch topology enables efficient regulation when output voltage is above, below, or equal to the input voltage.
• Wide input voltage capability allows operation across broad supply ranges without requiring external level shifting.
• Integrated clock synchronization permits phase alignment with other converters in multi-rail systems.

Applications

• Industrial power supplies requiring stable regulation under varying line conditions
• Automotive infotainment and body control modules operating on 12V or 24V systems
• Battery-powered equipment where input voltage fluctuates around the target output level

Procurement Notes

Verify that the specific suffix RHFT corresponds to the tape-and-reel packaging configuration required for your assembly process. Confirm that the component meets AEC-Q100 qualification standards if intended for automotive deployment. Ensure the ordering part number matches the exact temperature grade and package variant specified in the design documentation to avoid compatibility issues during manufacturing.

Selection Notes

Select this controller when the application demands a single-stage solution for buck-boost conversion rather than separate regulators. Consider the 28-VQFN package for space-constrained designs requiring high thermal performance. Evaluate the need for external components such as bootstrap capacitors and gate drivers based on the specific inductor and switch ratings chosen for the power stage.

Part Context

This component belongs to the LM5176 family of wide VIN synchronous buck-boost controllers. It serves as a non-isolated power management IC suitable for replacing traditional two-stage solutions. The device integrates high-side and low-side driver circuits to control external N-channel MOSFETs, simplifying the bill of materials compared to discrete implementations.

Replacement Considerations

Direct substitutes include the LM5175 series, which offers similar functionality but may differ in maximum voltage ratings or pinout configurations. Verify electrical parameters and thermal characteristics before swapping to ensure circuit stability and compliance with safety regulations.

FAQ

Can the LM5176 regulate the output voltage when it is lower than the input voltage?

Yes, the synchronous four-switch topology allows the device to operate efficiently in buck mode when the output voltage is below the input voltage.

What is the minimum operating input voltage for this controller?

The device supports a minimum input voltage of 6V, enabling operation from standard battery sources or regulated rails.