LM5176RHFR

Overview

The LM5176RHFR is a synchronous four-switch buck-boost DC/DC controller manufactured by Texas Instruments. It operates within a wide input voltage range of 4.2V to 55V, with an absolute maximum rating of 60V. The device regulates output voltages from 0.8V to 55V, supporting applications where the output may be equal to, higher than, or lower than the input. It utilizes current-mode control for both buck and boost modes to ensure stable performance.

Feature Summary

• Synchronous four-switch topology enables efficient step-up, step-down, and bypass operation
• Integrated high-side and low-side gate drivers support external power MOSFETs
• Programmable switching frequency allows synchronization with external clocks
• Comprehensive protection features include overvoltage, undervoltage lockout, and thermal shutdown

Applications

• Industrial systems with wide input voltage variations
• Battery-powered equipment requiring extended runtime
• Automotive infotainment and body electronics
• Telecommunications infrastructure power supplies

Procurement Notes

Verify the specific suffix RHFR against official datasheets to confirm tape-and-reel packaging and temperature grade. Ensure compatibility with required PCB footprint HTSSOP-28. Cross-reference manufacturer documentation for RoHS compliance status and lead time requirements before finalizing procurement plans.

Selection Notes

Select this component when input voltage fluctuates significantly around the target output level. It is suitable for designs requiring high efficiency across varying load conditions. Consider external MOSFET selection based on voltage ratings and thermal constraints. Evaluate EMI mitigation needs if spread spectrum functionality is utilized in the design.

Part Context

This part belongs to the LM5176 family of wide VIN synchronous buck-boost controllers. It serves as a core power management solution for applications demanding flexibility in voltage conversion ratios. The device integrates control logic with robust protection mechanisms, distinguishing it from simpler linear regulators or single-stage switching converters.

Replacement Considerations

LM5176PWPR: Pin-compatible alternative in different package. LM5176-Q1: Automotive qualified version with similar electrical characteristics. Verify pinout and thermal performance before substitution.