Texas Instruments has introduced two 20V step-down voltage regulators with PMBus digital interface and adaptive voltage scaling capability for non-isolated point-of-load designs. 

The 2MHz TPS40400 single-channel controller has a 3V to 20V input range and the 1.2MHz TPS40422 dual-channel or multi-phase controller has a 4.5V to 20V input voltage range.

According to the supplier, the efficiency is greater than 90% and adaptive voltage scaling saves power.

The TPS40400 and TPS40422 can be combined with the National 17-V LM25066 system power and hot-swap protection IC as a complete PMBus-compliant solution for 12V systems with input protection and power conversion.

For those 48V systems that generate a 12V intermediate bus, the National +/- 48-V LM5066 and LM5064 system power and protection circuits accurately measure, protect and control the electrical operating conditions.

The TPS40400 comes in a thermally enhanced 24-pin, 3.5-mm x 5.5-mm QFN package. The TPS40422 comes in a 40-pin, 6-mm x 6-mm package, and is currently sampling with expected volume production later in the fourth quarter. 

For more information, see http://www.ti.com/digitalpower