1 Introduction

The TPS563249 is a single, adaptive on-time, D-CAP3™ mode, synchronous buck converter requiring a very low external component count. The D-CAP3 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 1.4 MHz. The high-side and low-side switching MOSFETs are incorporated inside the TPS563249 package along with the gate-drive circuitry. The low drain-to-source on resistance of the MOSFETs allows the TPS563249 to achieve high efficiencies and helps keep the junction temperature low at high output currents. The TPS563249 dc/dc synchronous converter is designed to provide up to a 3-A output from an input voltage source of 4.5 V to 17 V. Rated input voltage and output current ranges for the evaluation module are given in Table 1-1.

The TPS563249EVM-031 evaluation module (EVM) is a single, synchronous buck converter providing 3.3 V at 3 A from 4.5-V to 17-V input. This user’s guide describes the TPS563249EVM-031 performance.