Stackable 18-Vin / 35-A PMBus Synchronous Buck DC-DCs

Texas Instruments (TI) claims the industry's highest-density, 18-V input, 35-A synchronous dc-dc buck converter, which offers full differential remote-voltage sensing and PMBus to support telemetry. TI's TPS546C23 power converter integrates high- and low-side MOSFETs into a small-footprint package that is significantly denser than competitive devices. Designers can stack two converters in parallel to drive loads up to 70A for processors in space-constrained and power-dense applications in various markets, including wired and wireless communications, enterprise and cloud computing, and data storage systems.

The highly integrated TPS546C23 power converter is 44-percent denser (amperes per square millimeter) than competitive devices. It features 0.5 percent reference-voltage accuracy over temperature and full differential remote-voltage sensing to meet the voltage accuracy requirements of deep sub-micron processors. Current sharing enables the stacking of two converters and high efficiency and excellent thermal performance are delivered via the device’s single-pad, stacked die, quad flat no-lead (QFN) package.

TPS546C23 key features and benefits: Integrated low Rdson power MOSFETs support 35A of continuous output current. On-chip PMBus interface and non-volatile memory simplify power-supply design and enable customization. Output current, output voltage and internal die temperature telemetry supported via PMBus facilitate active power management. Voltage-control mode with clock frequency synchronization and input feed-forward improves emi/noise and responds rapidly to input-voltage changes. Frequency synchronization to an external clock eliminates beat noise and reduces emi.

Available now from TI and its authorized distributors, the TPS546C23 is offered in a 40-pin, 5-mm by 7-mm by 1-mm PowerStackâ„¢ QFN package and is priced at US$4.62 in 1,000-unit quantities.