Radiation Hardened Four-Phase 5V to 0.8V, 100A, 1MHz with PMBus Evaluation Board

The ISL73849SLHEV3Z evaluation board demonstrates the performance of a high-current, four-phase power solution built with two ISL73849SLH radiation hardened dual-phase PWM controllers, four ISL73041SEH GaN half-bridge drivers, and sixteen ISL70020SEH 40V GaN FETs. This configuration delivers up to 100A and is optimized for powering the Versal VC1902 VCCINT core rail. The board operates from a 5V PVIN power rail with an auxiliary V_DD supply for the controller, driver circuits, and external clock generator. Convenient input/output connectors, accessible test points, and jumper settings provide an intuitive platform for evaluating point-of-load power performance in demanding space-grade applications.

Additionally, the output voltage can be dynamically adjusted from 0.2V to 1.2V by modifying the V_REF through PMBus on the fly, enabling flexible evaluation under varying load conditions. When adjusting V_REF, always ensure the voltage rating of the installed output capacitors is not exceeded to prevent component damage.