PMBus digital power chip drives 30A for sub-micron processors

Texas Instruments has introduced its first PMBus synchronous DC/DC buck converters with 20A and 30A current ratings.

The TPS544B25/C25 converters are designed for accurate voltage rail setting in designs with sub-micron processors.

The converters have a 0.5% reference-voltage accuracy and full differential remote-voltage sensing.

Also frequency synchronisation to an external clock eliminates beat noise and reduces EMI.

Additionally, the converters support pin-strapping that enables the devices to start up without PMBus commands to an output voltage set by a single resistor.

The digital PMbus interface is used for programming, monitoring of the output voltage, current and external temperature and fault reporting.

There is also the UCD90240 24-rail PMBus power sequencer and power manager for powering Ethernet switches.

Voltage-control mode with input feed-forward improves noise margin and responds well to input voltage changes. Other features include internal soft start, input under-voltage protection, thermal shutdown and a reset function.

Richard Wilson

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via Yuichun