Two new fully encapsulated digital dc/dc PMBus power modules deliver the highest power density and efficiency in their class. The dual ISL8274M operates from a 5-V or 12-V power rail, provides two 30-A outputs and up to 95.5% peak efficiency in a compact 18×23-mm2 footprint. The new ZL9024M operates from a 3.3-V rail and outputs 33 A of power in a 17×19 mm2 footprint. They deliver point-of-load (POL) conversions for advanced FPGAs, DSPs, ASICs and memory used in servers, telecom, datacom, optical networking and storage equipment. Both devices are easy-to-use, PMBus-configurable power supplies that include a controller, MOSFETs, inductor and passives encapsulated inside a module that increases available board space and reduces bill of materials (BOM).
The ISL8274M and ZL9024M digital power modules leverage Renesas’ patented ChargeMode control architecture, which provides the highest efficiencies with better than 90% on most conversions. The power modules also provide a single clock cycle fast transient response to output current load steps common in FPGAs and DSPs that process power bursts. Their compensation-free design keeps the modules stable regardless of output capacitor changes due to temperature, variation or aging. Eliminating the need for an external discrete compensation network also saves board space and additional BOM cost. The ISL8274M supports input voltages from 4.5 V to 14 V, while the ZL9024M accepts input voltages from 2.75 V to 4 V. Both modules offer adjustable output voltages as low as 0.6 V.
The encapsulated modules use Renesas’ proprietary High Density Array (HDA) package, which offers unmatched electrical and thermal performance through a single-layer conductive substrate that reduces lead inductance and dissipates heat primarily through the system board. The HDA’s copper lead-frame structure allows the modules to operate at full load over a wide temperature range with no airflow or heatsinks. The ISL8274M and ZL9024M also provide several protection features that ensure safe operations under abnormal operating conditions, further enhancing their robustness and reliability.
Among the key features of the ISL8274M digital power module are programmable Vout, soft-start, soft-stop, sequencing, margining and under-voltage, over-voltage, under-current, over-current, under temperature and over-temperature; monitoring of Vin, Vout, Iout, temperature, duty cycle, switching frequency, and faults; a power good indicator, and ±1.2% Vout accuracy over line, load, and temperature; a pin-strap mode using external resistors for standard settings; and internal nonvolatile memory that saves module configuration parameters and fault logging.
The ISL8274M is available now in a thermally enhanced 18x23x7.5-mm HDA package and is priced at $39 USD in 1k quantities. An ISL8274MEVAL1Z evaluation board is available for $150 USD. The ZL9024M is available now in a thermally enhanced 17x19x3.5-mm HDA package and is priced at $29 USD in 1k quantities. The ZL9024MEVAL1Z evaluation board is available for $95 USD.