IR3081A Datasheet | International Rectifier

DESCRIPTION The IR3081A Control IC bined with an IR XPhase TM Phase IC provides a full featured and flexible way to implement a plete 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 XPhase TM 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. The IR3081A is functionally equivalent to the IR3081, but incorporates the following modifications: - Under Voltage Lockout start threshold increased from 9.1V to 9.7V (typical) and hysteresis increased from 200m V to 800m V (typical). - Hysteresis (52m V typical) added to the SS/DEL parator to prevent Power Good output chatter. - Over current discharge current increased from 6u A to 40u A (typical) to reduce the over current delay time. - IIN pin precondition circuit added to disable current sharing in the phase ICs during soft start. .. FEATURES - - - - - - - - - - - - - - 6 bit VR 10 patible 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) +/-300m V Differential Remote Sense Programmable 150k Hz 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/5m A Bias Regulator provides System Reference Voltage Enable Input Small thermally enhanced 28L MLPQ package Page 1 of 39 1/31/05 APPLICATION CIRCUIT 12V RVCC 10 ohm CVCC 0.1u...