TILM5170QPHPRQ1

Overview

The LM5170QPHPRQ1 is an AEC-Q100 qualified bidirectional buck-boost controller designed for high-power automotive dual-battery systems, such as 48V to 12V conversions. It features dual-phase operation with integrated 5-A peak gate drivers and provides 1-percent accurate current regulation and monitoring. The controller supports high-voltage port ratings up to 100V and low-voltage port ratings up to 65V, making it suitable for demanding power distribution and mild-hybrid vehicle architectures.

Why Choose This Part

This controller offers functional safety capability and precision current sensing, allowing for accurate state-of-charge calculations and system health monitoring. Its multiphase architecture enables phase adding or dropping to optimize efficiency across a wide load range, while the 5-A gate drivers can drive large external MOSFETs for high-current applications. The inclusion of programmable dead-time control and diode emulation prevents negative current flow and improves overall thermal performance.

Applications

Getting Started

To evaluate the design, the LM5170EVM-BIDIR evaluation module provides a practical reference for bidirectional power flow between 48V and 12V ports. Design engineers should utilize TI's WEBENCH Power Designer or PSPICE models to simulate the compensation loop and verify the programmable soft-start and overvoltage protection settings. Ensure the thermal pad of the 48-HTQFP package is soldered to a large ground plane to manage the heat dissipation from the high-peak current gate drivers.