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IR3521
DATA SHEET XPHASE3TM AMD SVID CONTROL IC
DESCRIPTION
The IR3521 Control IC combined with an xPHASE3TM Phase IC provides a full featured and flexible way to implement a complete AMD SVID power solution. It provides outputs for both the VDD core and VDDNB auxiliary planes required by the CPU. The IR3521 provides overall system control and interfaces with any number of Phase ICs each driving and monitoring a single phase. The xPHASE3TM architecture results in a power supply that is smaller, less expensive, and easier to design while providing higher efficiency than conventional approaches.
FEATURES
2 converter outputs for the AMD processor VDD core and VDDNB auxiliary planes Supports High Speed (HS) I2C Serial communications PSI_L serial commands are communicated to a programmable number of phase ICs 0.5% overall system set point accuracy High speed error amplifiers with wide bandwidth of 20MHz and fast slew rate of 10V/us Remote sense amplifiers provide differential sensing and require less than 50uA bias current Programmable Dynamic VID Slew Rates Programmable VID Offset (VDD output only) Programmable output impedance (VDD output only) Programmable Dynamic OC for IDD_Spike Programmable per phase switching frequency of 250kHz to 1.5MHz Hiccup over current protection with delay during normal operation Central over voltage detection and communication to phase ICs through IIN (ISHARE) pin OVP disabled during dynamic VID down to prevent false triggering Over voltage signal to system with over voltage detection during powerup and normal operation Detection and protection of open remote sense lines Gate Drive and IC bias linear regulator control with programmable output voltage and UVLO Small thermally enhanced 32L MLPQ (5mm x 5mm) package
ORDERING INFORMATION
Device
IR3521MTRPBF IR3521MPBF (Samples Only)
Package
32 Lead MLPQ (5 x 5 mm body) 32 Lead MLPQ (5 x 5 mm body)
Order Quantity
3000 per reel 100 piece strips
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V3.03
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IR3521
APPLICATION CIRCUIT
12V
Q3 CVCCL9 PHSIN
12V VCCL
To Converters To Phase IC VCCL & GATE DRIVE BIAS Phase Clock Input to Last Phase IC of VDD 2 wire Digital Daisy Chain Bus to VDD & VDDNB Phase ICs Power Saving Indicator to VDD Phase ICs
RVCCLFB1 RVCCLDRV
RVCCLFB2
PGOOD
30 27 31 28 32 29 26 25
PHSOUT CLKOUT
SVC
VCCLDRV
VCCLFB
PGOOD
VCCL
SVC
PHSIN
PHSOUT
CLKOUT
EPAD
SVD PWROK ENABLE
CSS/DEL2 CVDAC2 RVDAC2 ROCSET2
1 2 3 4 5 6 7 8
SVD PWROK ENABLE IIN2 SS/DEL2 VDAC2 OCSET2 VOSNS2+ VOSNS1+ VONSN1VOSNS2EAOUT2 VOUT2 FB2
PSI_L ROSC
24 23 22 21 20 19 18 17 CSS/DEL1 RVDAC1 ROCSET1 CVDAC1 ROSC
PSI_L
IR3521 CONTROL IC
VDRP1 IIN1 SS/DEL1 VDAC1 OCSET1 EAOUT1 VOUT1 FB1
ISHARE1
VDAC1 EAOUT1
CDRP1 RDRP1
3 Wire Analog Control Bus to VDD Phase ICs
9
10
11
12
13
14
15
16
RCP2
CCP21
RFB22 RFB21
CFB2
CFB1
RFB12
RCP1
CCP11 RTHERMISTOR1
CCP22
RFB11
CCP12
Load Line NTC Thermistor; Locate close to VDD Power Stage.