LM5176PWPT

Overview

The LM5176PWPT is a synchronous four-switch buck-boost DC/DC controller from Texas Instruments, designed to regulate output voltage above, below, or equal to the input. It operates within a wide input voltage range of 4.2V to 55V, with an absolute maximum rating of 60V. The device supports adjustable switching frequencies between 100 kHz and 600 kHz and can synchronize with an external clock. It features peak current mode control for excellent load and line regulation. The output voltage is adjustable from 800 mV to 55V. Integrated protection includes cycle-by-cycle current limit, input UVLO, output OVP, and thermal shutdown. The component is housed in a 28-pin HTSSOP package.

Feature Summary

• Single-inductor topology enables efficient buck and boost conversion without requiring multiple inductors
• Integrated high-side and low-side gate drivers support N-channel MOSFETs for compact designs
• Flexible frequency programming allows synchronization to external clocks to reduce EMI
• Comprehensive protection suite ensures reliability under fault conditions

Applications

• Automotive infotainment systems requiring wide input voltage tolerance
• Industrial power supplies with varying input sources
• Battery-powered equipment needing stable output across discharge cycles
• Point-of-load conversion in server architectures

Procurement Notes

Verify the specific suffix matches your packaging requirements, as the PWPT designation indicates tape and reel packaging. Confirm that the HTSSOP-28 footprint aligns with your PCB layout constraints. Ensure the operating temperature range meets your environmental specifications. Cross-reference the datasheet revision date to confirm feature availability. Validate that the 55V input limit suits your maximum source voltage.

Selection Notes

Choose this controller when input voltage fluctuates significantly around the desired output level. It is suitable for applications demanding high efficiency across both buck and boost modes. Consider the integrated gate drivers if minimizing external component count is a priority. Evaluate the need for frequency synchronization to manage electromagnetic interference in dense layouts. Assess thermal performance requirements given the single-inductor topology.

Part Context

The LM5176 belongs to Texas Instruments' family of wide-input-voltage synchronous buck-boost controllers. It complements parts like the LM5175, which offers a lower 42V input limit. The device serves as a core component in power management solutions where input stability cannot be guaranteed. Its design focuses on simplifying bill-of-materials by integrating necessary driver stages.

Replacement Considerations

LM5176QPWPTQ1 is the automotive-grade equivalent certified under AEC-Q100 standards.