IR3500V Datasheet, PDF (1/34 Pages) International Rectifier – XPHASE3TM VR11.1 CPU VTT CONTROL IC

IR3500V
DATA SHEET
XPHASE3^TM VR11.1 CPU VTT CONTROL IC
DESCRIPTION
The IR3500V Control IC combined with one or more xPhase3^TM Phase IC implement the control and
MOSFET driver functions for a VR11.1 CPU VTT power supply.
FEATURES
• 1 to X phase operation with matching Phase IC
• 0.7% 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 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 IC(s)
• 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
RVCCLDRV
RVCCLFB1 RVCCLFB2
CVCCL
4.7uF
PGOOD
VID4
VID3
VID2
ENABLE
VRHOT
1 _VID7
2 _VID6
3 _VID5
4 _VID4
5 _VID3
6 _VID2
7 _VID1
8 _VID0
LGND ²⁴
ROSC / OVP ²³
SS/DEL ²²
IR3500V
VDAC ²¹
OCSET ²⁰
VSETPT ¹⁹
IIN ¹⁸
VDRP ¹⁷
ROSC
C SS/ D EL
RVDAC
R OC SET
C VD AC
RHOTSET2
RHOTSET1
RFB1 CFB RDRP
RFB
RCP CCP
C C P1
1 _ISHARE
SW ¹²
2
DACIN _IR3505 GATEH
11
CBST2
3 _LGND
BOOST ¹⁰
4 _PHSIN
VCCL ⁹
CVCCL
RCS
CCS
L
CIN
DISTRIBUTION
IMPEDANCE
VOUT SENSE+
COUT
VOUT+
VOUT-
VOUT SENSE-
RFB2
RTHERMISTOR1
RTHERMISTOR2
Close to
Power Stage
Figure 1 – Single Phase VR11.1 CPU VTT Application Circuit
Page 1 of 34
July 28, 2008