1 Introduction

The TPS54328 is a single, adaptive on-time, D-CAP2™-mode, synchronous buck converter requiring a very low external component count. The D-CAP2 control circuit is optimized for low-ESR output capacitors such as POSCAP, SP-CAP, or ceramic types and features fast transient response with no external compensation. The switching frequency is internally set at a nominal 700 kHz. The high-side and low-side switching MOSFETs are incorporated inside the TPS54328 package along with the gate drive circuitry. The low drain-to-source on resistance of the MOSFETs allows the TPS54328 to achieve high efficiencies and helps keep the junction temperature low at high output currents. The TPS54328 also features auto-skip Eco-mode for improved light load efficiency. The TPS54328 DC/DC synchronous converter is designed to provide up to a 3-A output from an input voltage source of 4.5 V to 18 V. The output voltage range is from 0.76 V to 7.0 V. Rated input voltage and output current range for the evaluation module are given in Table 1-1.

The TPS54328EVM-686 evaluation module is a single, synchronous buck converter providing 1.05 V at 3 A from 4.5-V to 18-V input. This user’s guide describes the TPS54328EVM-686 performance.