First 18-V buck converter uses PMBus digital interface

The TPS65400 four-channel buck dc/dc converter with a PMBus/I² C digital interface and targets applications in space-constrained equipment that experience high ambient operating temperature without cooling, such as small cell base stations, infotainment and solid state devices. The device is a dual- or quad-output configurable dc/dc converter that integrates eight power MOSFETs and features efficiency at up to 95%.

The TPS65400 includes four high-current synchronous buck switching regulators with integrated MOSFETs. Each switching converter supplies a 2- or 4-A output to power digital circuits such as the processor, FPGA, ASIC, memory and digital input/output. Switching frequency for the converter is independently adjustable up to 2.2 MHz. The device, which can be powered from a single-input voltage rail between 4.5 and 18 V, supports applications running off a 5- or 12-V intermediate power distribution bus. The converter is offered in a 48-pin, thermally-enhanced VQFN package.