PoL DC/DC converters are configurable via PMBus

25th February 2015

Barney Scott

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Murata’s OKDx-T/20-W12 and T/25-W12 series PoL DC/DC converters offer an efficient, high power density, PMBus compatible digital power solution for space constrained embedded applications such as powering CPUs, datacomms/telecomms, Distributed Bus Architectures (DBA), programmable logic, and mixed voltage systems in the networking, computing/servers and industrial market sectors.

Expanding its Okami range of non-isolated PoL DC/DC converters, Murata’s digitally controlled OKDx-T/20-W12 and OKDx-T/25-W12 are capable of delivering 20A/66W and 25A/82.5W outputs respectively, yet these high power-density modules measure just 25.65x13.8x8.2mm. Offered in three different packages - through-hole, single-in-line and surface-mount - the converters can easily be configured and monitored via the standard PMBus communication protocol.

Suitable for a wide range of applications, the convertors accept input voltages from 4.5 to 14V and have an output voltage range of 0.6 to 3.3V with a typical efficiency of 97.1% at 5V_IN, 3.3V_OUT and at 50% load.

The products are delivered with a default firmware configuration suitable for a wide range of operation in terms of input voltage, output voltage, and load. Both series’ power management design includes advanced features like non-linear transient response, phase spreading, synchronisation, digital current sharing, and optimised dead time control.

In addition to all these features, the 25A PoLs (OKDx-T/25-W12) series also features ‘Dynamic Loop Compensation’, where the PID parameters of the control loop are automatically calculated and configured depending on the operating conditions and output filter. It measures the characteristics of the power train, calculates the proper compensator PID coefficients and implements them.

Other standard features include short circuit, over current, over voltage, over temperature, input under voltage protection, voltage margining and tracking, power good, remote sense and remote on/off.

Murata says its OKDx-T/20-W12 and OKDx-T/25-W12 series PoL DC/DC converters are competitive with those from other suppliers in terms of performance and cost. Both series are compatible to the AMP standard, and sample quantities are available from stock.