The ISL62883 is a multiphase PWM buck regulator for

miroprocessor core power supply. The multiphase buck converter

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 ISL62883 uses two integrated gate

drivers and an external gate driver to provide a complete solution.

The PWM modulator 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 ISL62883 is fully compliant with IMVP-6.5™ specifications. It

responds to PSI# and DPRSLPVR signals by adding or dropping

PWM3 and Phase-2 respectively, adjusting overcurrent protection

threshold accordingly, and entering/exiting diode emulation mode.

It reports the regulator output current through the IMON pin. It

senses the current by using either a discrete resistor or inductor

DCR whose variation over temperature can be thermally

compensated by a single NTC thermistor. It uses differential

remote voltage sensing to accurately regulate the processor die

voltage. 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. In 2-Phase configuration, the

ISL62883 offers the FB2 function to optimize 1-Phase

performance.

The ISL62883B has the same functions as the ISL62883, but

comes in a different package.

Features

• Precision Multiphase Core Voltage Regulation

- 0.5 System Accuracy Over-Temperature

- Enhanced Load Line Accuracy

• Microprocessor Voltage Identification Input

- 7-Bit VID Input, 0.300V to 1.500V in 12.5mV Steps

- Supports VID Changes On-The-Fly

• Supports Multiple Current Sensing Methods

- Lossless Inductor DCR Current Sensing

- Precision Resistor Current Sensing

• Supports PSI# and DPRSLPVR modes

• Superior Noise Immunity and Transient Response

• Current Monitor and Thermal Monitor

• Differential Remote Voltage Sensing

• High Efficiency Across Entire Load Range

• Programmable 1-, 2- or 3-Phase Operation

• Two Integrated Gate Drivers

• Excellent Dynamic Current Balance Between Phases

• FB2 Function in 2-Phase Configuration to Optimize 1-Phase

Performance

• Adaptive Body Diode Conduction Time Reduction

• User-selectable Overshoot Reduction Function

• Small Footprint 40 Ld 5x5 or 48 Ld 6x6 TQFN Package

• Pb-Free (RoHS Compliant)

Applications

• Notebook Computers