ISL8271M Digital DC/DC PMBus 33A Module Evaluation Board

The ISL8271M is a 33A step-down DC/DC power supply module with integrated digital PWM controller, synchronous power switches, an inductor and passives. Only bulk input and output capacitors are needed to finish the design. The 33A of continuous output current can be delivered without a need of airflow or a heat sink. The ISL8271M uses Charge Mode control architecture, which responds to a transient load within a single switching cycle. The ISL8271MEVAL1Z evaluation board is a 3inx4.5in 4-layer FR4 board with 2 oz. in all layers. This evaluation board comes with a placeholder for pin-strap resistors to adjust output voltage, switching frequency, input under voltage (UVLO) protection threshold, and device PMBus address. More configuration such as soft-start, and fault limits can be easily programmed or changed via PMBus compliant serial bus interface. ZLUSBEVAL3Z (USB to PMBus adapter) is provided with this evaluation kit, which connects the evaluation board to a PC to activate the PMBus communication interface. The PMBus command set is accessed by using the Power Navigator evaluation software from a PC running Microsoft Windows.

• VIN range of 4.5V to 14V, VOUT adjustable from 0.6V to 5V
• Programmable VOUT, margining, UV/OV, IOUT limit, soft-start/stop, sequencing, and external synchronization
• Monitor: VIN, VOUT, IOUT, temperature, duty cycle, switching frequency and faults
• Charge Mode™ control tunable with PMBus
• Mechanical switch for enable and power-good LED indicator