1 Introduction

In light-load conditions, the TPS565242 operates in Eco mode to enable higher efficiency by varying its switching frequency. The TPS565247 operates in FCCM to maintain constant switching frequency. The main difference is at light loading, but the other behaviors are similar. This user's guide mainly introduces the TPS565242 and includes some features about the TPS565247 that are different from the TPS565242.

The TPS56524x is a single, adaptive on-time, D-CAP3™ control mode, synchronous buck converter that requires 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 600 kHz. The high-side and low-side switching MOSFETs are incorporated inside the TPS56524x package along with the gate-drive circuitry. The low drain-to-source on resistance of the MOSFETs and fast switching slew rate allow the TPS56524x to achieve high efficiencies and help keep the junction temperature low at high output currents. The TPS56524x DC/DC synchronous converter is designed to provide up to a 5-A output from an input voltage source of 3 V to 16 V. The output voltage range is from 0.6 V to 7 V. Rated input voltage and output current ranges for the evaluation module are given in Table 1-1.

The TPS565242EVM evaluation module (EVM) is a single, synchronous buck converter providing 1.05 V at 5 A from 3-V to 17-V input. This user’s guide describes the TPS565242EVM performance.