IR3500 Datasheet, PDF (1/47 Pages) International Rectifier – XPHASE3TM VR11.0 & AMD PVID CONTROL IC

IR3500
DATA SHEET
XPHASE3^TM VR11.0 & AMD PVID CONTROL IC
DESCRIPTION
The IR3500 Control IC combined with an xPHASE3^TM Phase IC provides a full featured and flexible way to
implement a complete VR11.0 or AMD PVID 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 XPhase3^TM architecture implements a power supply that is smaller, less
expensive, and easier to design while providing higher efficiency than conventional approaches.
FEATURES
• 1 to X phase operation with matching Phase IC
• VID Select pin configures AMD 5 or 6 bit PVID, Intel VR11 with/out startup to 1.1V Boot voltage
• 0.5% overall system set point accuracy
• Programmable 250kHz to 9MHz Daisy-chain digital phase timing clock oscillator frequency provides a
per phase switching frequency of 250kHz to 1.5MHz without external components
• Programmable Dynamic VID Slew Rate
• Programmable VID Offset or No Offset
• Programmable Load Line Output Impedance
• High speed error amplifier with wide bandwidth of 30MHz and fast slew rate of 12V/us
• Programmable converter current limit during soft start, hiccup with delay during normal operation
• Central over voltage detection with programmable threshold and communication to phase ICs
• Over voltage signal output to system with overvoltage detection during powerup and normal operation
• Detection and protection of open remote sense line and open control loop
• IC bias linear regulator control with programmable output voltage and UVLO
• Programmable VRHOT function monitors temperature of power stage through a NTC thermistor
• Remote sense amplifier with true converter voltage sensing and less than 50uA bias current
• Simplified VR Ready output provides indication of proper operation and avoids false triggering
• Small thermally enhanced 32L 5mm x 5mm MLPQ package
12V
VR READY
VIDSEL
Q1
R VC C LD R V
RVCCLFB1 RVCCLFB2
Optional
FUSE
C VC C L
4.7uF
ROVP1
Q3
Q2
SCR
R OVP2
To Converter
VCCL
VID7
VID6
VID5
VID4
VID3
VID2
VID1
VID0
ENABLE
VRHOT
1
VI D 7
2 _VID6
3 _VID5
4 _VID4
5 _VID3
6
VI D 2
7 _VID1
8 _VID0
IR3500
CONTROL
IC
24
LGND
ROSC / OVP ²³
SS/DEL ²²
VDAC ²¹
OCSET ²⁰
19
VSETPT
IIN ¹⁸
VDRP ¹⁷
R OSC
CSS/ DEL
R VD AC
ROCSET
RVSETPT
C VD AC
VDAC
RTHERMISTOR2 RHOTSET2
R TH ER MI STOR 1
Close to
Power Stage
RHOTSET1
VC C L
RFB1 CFB
RFB
CDRP
RDRP
RCP
CCP
C C P1
RFB2
Figure 1 – Application Circuit
6 Wire
Bus to
Phase
ICs
VCC SENSE +
To Load
VSS SENSE -
Page 1 of 47
June 12, 2007