IR3081 Datasheet, PDF (1/20 Pages) International Rectifier – XPHASE VR 10.0 CONTROL IC

IR3081
DATA SHEET
XPHASE^TM VR 10.0 CONTROL IC
DESCRIPTION
The IR3081 Control IC combined with an IR XPhase^TM Phase IC provides a full featured and flexible way
to implement a complete VR 10.0 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 IR3081 is intended for VRD or VRM/EVRD 10.0 applications that use external VCCVID/VTT circuits.
FEATURES
• 6 bit VR 10.0 compatible VID with 0.5% overall system accuracy
• 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
PACKAGE PINOUT
1 _OSCDS
2
VID5
3 _VID0
4 _VID1
5 _VID2
6 _VID3
7
VID4
IR3081
CONTROL
IC
VBIAS ²¹
20
BBFB
EAOUT ¹⁹
FB ¹⁸
VDRP ¹⁷
IIN ¹⁶
15
OCSET
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9/1/03