90A PoL DC/DC for SoC core supplies reaches 94% efficiency

February 16, 2017 // By Graham Prophet
In Murata's OKD series of digital PoL DC-DC converters, the 90 A/162 W OKDx-T/90 series is the highest current-rated variant joining others that provide currents from 6 A to 60 A. The PMBus compliant OKDx-T/90 series is suited for FPGA and processor applications.

The module is specified to operate over a Vin range of 7.5V to 14V and provides a user-adjustable Vout in the range of 0.6V to 1.8VDC with efficiency of 94%. The OKDx-T/90 is available in three different package configurations:

- SIP measuring just 2.0 x 0.37 x 0.75 in (50.8 x 9.51 x19.05 mm),

- Horizontal mounting TH (Through-Hole), and

-SMT versions measuring 2.0 x 0.75 x 0.39 in (50.8 x 19.05 x 10 mm).


The OKDx-T/90 is suited for space-constrained embedded applications. Critical performance parameters are fully accessible through the PMBus via the Murata Power Designer GUI software. The OKDx-T/90-W12 series converters are delivered with a default firmware configuration suitable for a wide operating range in terms of input voltage, output voltage, and loading conditions. Typical efficiency is 94% with 12 Vin, at 1.8 Vout and 50% load.


The converter’s digital control power management functions include a range of advanced features. Its non-linear transient response improves the dynamic response time, reducing Vout deviation due to large load changes; phase spreading reduces input capacitor requirements and efficiency losses. The synchronization feature eliminates beat frequency reflection, resulting in less EMI filtering, and digital current sharing ensures near-100% current sharing accuracy with up to four modules operating in parallel. The converters provide Dynamic Loop Compensation, where the feedback loop parameters are automatically calculated and configured depending on the unique application-specific operating conditions. Additional standard features include output short circuit, over current, over voltage, over temperature, and input under voltage protection. Voltage margining, tracking, power good, remote sense, and remote on/off are also features.


Murata Europe; www.murata.com