1 Introduction

In light-load conditions, the TPS563203 operates in eco-mode to enable higher efficiency by varying the switching frequency, the TPS563206 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 TPS563203 and includes some TPS563206 features that are different from the TPS563203.

The TPS56320x 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 mode 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 TPS56320x package along with the gate-drive circuitry. The low drain-to-source on resistance of the MOSFETs and fast switching slew rate allow the TPS56320x to achieve high efficiency and help keep the junction temperature low at high output currents. The TPS56320x DC/DC synchronous converter is designed to support up to a 3-A continuous current from an input voltage source of 4.2 V to 17 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 TPS56320xEVM evaluation module (EVM) is a single, synchronous buck converter providing 1.05 V at 3 A from 4.2-V to 17-V input. This user’s guide describes the TPS56320xEVM performance.