The TPS51397A is a synchronous buck converter designed to provide up to a 10-A output. The input voltage is rated for 4.5 V to 24 V. The TPS51397A uses a proprietary D-CAP3™ control mode. It provides a fast transient response with no external compensation, and supports low ESR output capacitors. A MODE pin is used to set Eco-mode or OOA mode for light-load running and 500-kHz or 800-kHz switching frequency. Rated input voltage and output current range for the evaluation module are given in Table 1-1. The high-side and low-side switching MOSFETs are integrated inside the TPS51397A package along with the gate-driver circuitry. The low drain-to-source on-resistance of the MOSFET allows the TPS51397A to achieve high efficiencies and helps to keep the junction temperature low at high output currents. An external divider allows for an adjustable output voltage. Additionally, the TPS51397A provides adjustable soft start and undervoltage lockout inputs and an open drain power good output.

This user’s guide describes the TPS51397AEVM performance.

The TPS51397AEVM is a single, synchronous buck converter providing 5 V at 10 A from 5.5-V to 24-V input. For 5-V output application, it can support Vin from 5.5 V. While for lower output application, for example, a 1.05-V output, it can support Vin from 4.5 V.

A summary of the TPS51397AEVM performance specifications is provided in Table 2-1. Specifications are given for an input voltage of 12 V and an output voltage of 5 V, unless otherwise specified. The ambient temperature is 25°C for all measurements, unless otherwise noted.

The evaluation module is designed to provide access to the features of the TPS51397A. Some modifications can be made to this module.