18-V Multi-Channel Synchronous Buck Converter with PMBus™ Digital Interface

Texas Instruments (TI) introduced a four-channel buck DC/DC converter with PMBus/I2C digital interface for 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 TPS65400 dual- or quad-output configurable DC/DC converter integrates eight power MOSFETs and features industry-leading efficiency at up to 95-percent in the smallest footprint.

The TPS65400 includes four high-current synchronous buck switching regulators with integrated MOSFETs. Each switching converter supplies a 2-A or 4-A output to efficiently 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 TPS65400, which can be powered from a single-input voltage rail between 4.5 V and 18 V, supports applications running off a 5-V or 12-V intermediate power distribution bus.

Features:

• Flexible power up/down sequencing control increases system reliability.
• Parameter configuration and status monitoring via PMBus enhances system intelligence.
• Dynamic voltage scaling optimizes processor performance.
• Phase interleaving reduces input capacitance and ripple.
• Current sharing supports higher output current and enhances design flexibility.
• Small 48-pin VQFN package measures 7 mm by 7 mm by 0.9 mm.

Available in volume now from TI and its authorized distributors, the TPS65400 is offered in a 48-pin, thermally-enhanced VQFN package and priced at US$3.68 in 1,000-unit quantities.  Order the TPS65400EVM-678 evaluation module for US$199.