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IR3500A Datasheet, PDF (1/48 Pages) International Rectifier – XPHASE3TM VR11.0 & AMD PVID CONTROL IC | |||
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IR3500A
DATA SHEET
XPHASE3TM VR11.0 & AMD PVID CONTROL IC
DESCRIPTION
The IR3500A Control IC combined with an xPHASE3TM 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 XPhase3TM 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 PGOOD output provides indication of proper operation and avoids false triggering
⢠Small thermally enhanced 32L 5mm x 5mm MLPQ package
⢠RoHS Compliant
12V
PGOOD
VIDSEL
Q1
RVC CLD RV
RVCCLFB1 RVCCLFB2
Optional
FUSE
CVCC L
4.7uF
R OVP1
Q3
Q2
SCR
R OVP2
To Converter
VCCL
VID7
VID6
VID5
VID4
VID3
VID2
VID1
VID0
1 VID7
2 VID6
3 VID5
4 VID4
5 VID3
6 VID2
7 VID1
8 VID0
IR3500A
CONTROL
IC
LGND 24
ROSC / OVP 23
SS/DEL 22
VDAC 21
OCSET 20
VSETPT 19
IIN 18
VDRP 17
R OSC
C SS/ D EL
R VD AC
R OC SET
RVSETPT
C VDAC
VDAC
6 Wire
Bus to
Phase
ICs
ENABLE
VRHOT
R HOTSET2
R HOTSET1
RFB1 CFB
RFB
CDRP
RDRP
RCP
CCP
C CP1
VCC SENSE +
To Load
VSS SENSE -
R F B2
R THERMI STOR1
R THERMI STOR2
Close to
Power Stage
Figure 1 â Application Circuit
Page 1 of 48
July 28, 2009
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