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Data Sheet No. PD94710
IR3082
XPHASETM AMD OPTERONTM/ATHLON 64TM CONTROL IC
DESCRIPTION
The IR3082 Control IC combined with an IR XPhaseTM Phase IC provides a full featured and flexible way
to implement a complete Opteron or Athlon64 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. With simple 5 bit voltage programming and a few external components, the IR3082
is also well suited for general purpose multiphase applications. The XPhaseTM architecture results in a
power supply that is smaller, less expensive, and easier to design while providing higher efficiency than
conventional approaches.
FEATURES
• 5 bit VID with 1% overall system set point accuracy
• Programmable Dynamic VID Slew Rate
• +/-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 Power Good output provides indication of proper operation and avoids false triggering
• Operates from 12V input with 9.75V Under-Voltage Lockout
• 7.0V/5mA Bias Regulator provides System Reference Voltage
• Small thermally enhanced 20L MLPDQaptaaSckhaegeet4U.com
DataShee
APPLICATION CIRCUIT
12V
ENABLE
VID0
VID1
VID2
VID3
VID4
10 0.1uF
CDSSEL/
20 19 18 17 16
IR30821
2
VID0 NEABEL
VID1
GD
R
WP
DSSEL/
OUPT
MR
GNDL VCC
VBIAS
15
14
3 VID2 CONTROL EAOUT 13
IC4 VID3
FB 12
5
VID4 ONVSS-
CS
OR
DCVA
SET
OC
VDRP
NII
11
6 7 8 9 10
ORCS ROCSET
0.1uF
RVDRP
RVDAC
CVDAC
RVFB
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POWER GOOD
5 Wire Analog Bus
(to PHASE ICs)
VCC SENSE
VSS SENSE
12/17/04
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