ISL62882B

Description

The ISL62882B is a multiphase PWM buck regulator for miroprocessor core power supply. The multiphase buck converter ISL62882B uses interleaved phase to reduce the total output voltage ripple with each phase carrying a portion of the total load current, providing better system performance, superior thermal management, lower component cost, reduced power dissipation, and smaller implementation area. The ISL62882B uses two integrated gate drivers to provide a complete solution. The PWM modulator ISL62882B is based on Intersil's Robust Ripple Regulator (R3) technology™. Compared with traditional modulators, the R3™ modulator commands variable switching frequency during load transients, achieving faster transient response. With the same modulator, the switching frequency is reduced at light load, increasing the regulator efficiency. The ISL62882B is fully compliant with IMVP-6.5™ specifications. The ISL62882B responds to PSI# and DPRSLPVR signals by adding or dropping Phase 2, adjusting overcurrent protection threshold accordingly, and entering/exiting diode emulation mode. IThe ISL62882B reports the regulator output current through the IMON pin. The ISL62882B senses the current by using either discrete resistor or inductor DCR whose variation over temperature can be thermally compensated by a single NTC thermistor. The ISL62882B uses differential remote voltage sensing to accurately regulate the processor die voltage. The unique split LGATE function further increases light load efficiency. The adaptive body diode conduction time reduction function minimizes the body diode conduction loss in diode emulation mode. User-selectable overshoot reduction function offers an option to aggressively reduce the output capacitors as well as the option to disable it for users concerned about increased system thermal stress. The ISL62882B offers the FB2 function to optimize 1-phase performance. The ISL62882B has the same functions as the ISL62882, but comes in a different package.