LM5175PWPT

Overview

The LM5175PWPT 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 peaks up to 60 V. The device regulates output voltages from 800 mV to 55 V and supports output currents up to 20 A. It features an adjustable switching frequency between 100 kHz and 600 kHz with 100% maximum duty cycle. The component is housed in a QFN-28 package, operates within a temperature range of -40°C to +125°C, and draws a typical operating supply current of 1.65 mA.

Feature Summary

• Synchronous four-switch topology enables efficient buck, boost, and bypass operation across wide input-output voltage differentials.
• Integrated high-current gate drivers support external N-channel MOSFETs for robust power handling.
• Comprehensive protection suite includes input UVLO, output OVP, thermal shutdown, and programmable soft-start.
• Flexible control options allow selection between continuous or discontinuous conduction modes with spread spectrum capabilities.

Applications

• Automotive cold-crank systems requiring stable regulation during battery voltage transients
• Industrial PC power supplies managing variable bus voltages
• USB Power Delivery interfaces needing bidirectional voltage conversion
• LED lighting drivers operating with fluctuating source potentials

Procurement Notes

Verify the specific suffix 'PT' corresponds to the QFN-28 package variant when ordering. Confirm that the required application does not demand automotive qualification, as this standard part lacks AEC-Q100 certification. Ensure design compatibility with the specified HTSSOP or QFN footprint dimensions provided in the official datasheet before finalizing procurement.

Selection Notes

Select this controller for designs requiring a single inductor solution to handle both step-up and step-down scenarios efficiently. It is suitable for applications where input voltage may frequently exceed or fall below the target output level. Consider the external MOSFET selection carefully to match the 20 A capability and switching speed requirements of the integrated drivers.

Part Context

This component belongs to the LM5175 family of wide VIN synchronous buck-boost controllers. It shares core architectural similarities with the LM5176, which offers higher voltage ratings. The PWPT designation specifically identifies the plastic quad flat no-lead package variant within the broader product line.

Replacement Considerations

LM5175PWP serves as the pin-compatible alternative in the HTSSOP-28 package. For automotive-grade requirements, consider the LM5175QPWPRQ1 or LM5175QPWPTQ1 variants which meet AEC-Q100 standards while maintaining functional equivalence.

FAQ

Does the LM5175 support frequency synchronization?

Yes, the switching frequency can be synchronized to an external clock signal to reduce system-wide noise interference.

What protection features are included?

The device includes per-cycle current limiting, optional average input/output current limiting, hiccup mode for overloads, output overvoltage protection, and thermal shutdown.