1 Introduction

The TPS54239E is a single, adaptive on-time, D-CAP2™-mode, synchronous buck converter requiring a 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 600 kHz. The high-side and low-side switching MOSFETs are incorporated inside the TPS54239E package along with the gate-drive circuitry. The low drain-to-source on-resistance of the MOSFETs allows the TPS54239E to achieve high efficiencies and helps keep the junction temperature low at high-output currents. To further enhance efficiency at light loads, the TPS54239E features pulse skipping Eco-mode operation. The TPS54239E dc/dc synchronous converter is designed to provide up to a 2-A output from an input voltage source of 4.5 V to 23 V. The output voltage range is from 0.76 V to 7 V. Rated input voltage and output current range for the evaluation module are given in Table 1-1.

The TPS54239EEVM-056 evaluation module circuit is a single, synchronous buck converter providing 1.05 V at 2 A from 4.5-V to 23-V input. This user’s guide describes the TPS54239EEVM-056 performance.