1 Introduction

The TPS54494 is a dual, 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 of 700 kHz. The high-side and low-side switching MOSFETs are incorporated inside the TPS54494 package along with the gate drive circuitry. The low, drain-to-source on-resistance of the MOSFETs allows the TPS54494 to achieve high efficiencies and helps keep the junction temperature low at high-output currents. The TPS54494 also features auto-skip Eco-mode operation for improved light-load efficiency. The TPS54494 dual DC/DC synchronous converter is designed to provide up to 4 A output on CH1 and 2 A output on CH2 from an input voltage source of 4.5 V to 18 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 TPS54494EVM evaluation module is a dual, synchronous buck converter providing 3.3 V at 4 A on CH1 and 1.5 V at 2 A on CH2. This user’s guide describes the TPS54494 EVM performance.