DESCRIPTION

The IR3081A Control IC combined with an IR XPhaseTM Phase IC provides a full featured and flexible way to implement a complete VR 10 power solution. The “Control” IC provides overall system control and interfaces with any number of “Phase ICs” which each drive and monitor a single phase of a multiphase converter. The XPhaseTM architecture results in a power supply that is smaller, less expensive, and easier to design while providing higher efficiency than conventional approaches. The IR3081A is intended for VRD 10 or VRM/EVRD 10 applications that use external VCCVID/VTT circuits.

FEATURES

• 6 bit VR 10 compatible VID with 0.5 overall system accuracy

• 1 to X phases operation with matching phase ICs

• Programmable Dynamic VID Slew Rate

• No Discharge of output capacitors during Dynamic VID step-down (can be disabled)

• +/-300mV Differential Remote Sense

• Programmable 150kHz to 1MHz oscillator

• Programmable VID Offset and Load Line output impedance

• Programmable Softstart

• Programmable Hiccup Over-Current Protection with Delay to prevent false triggering

• Simplified Powergood provides indication of proper operation and avoids false triggering

• Operates from 12V input with 9.1V Under-Voltage Lockout

• 6.8V/5mA Bias Regulator provides System Reference Voltage

• Enable Input

• Small thermally enhanced 28L MLPQ package