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International Rectifier Electronic Components Datasheet

IR3521 Datasheet

XPHASE3 AMD SVID CONTROLLER

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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
Page 1
V3.03


International Rectifier Electronic Components Datasheet

IR3521 Datasheet

XPHASE3 AMD SVID CONTROLLER

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APPLICATION CIRCUIT
12V
PGOOD
SVC
SVD
PWROK
ENABLE
Q3
RVCCLDRV
RVCCLFB1 RVCCLFB2
CVCCL9
1
2
3
4
CVDAC2
CSS/DEL2 5
RVDAC2
6
ROCSET2 7
8
SVD
PWROK
ENABLE
IIN2
SS/DEL2
VDAC2
OCSET2
EAOUT2
IR3521
CONTROL
IC
EPAD
PSI_L
ROSC
VDRP1
IIN1
SS/DEL1
VDAC1
OCSET1
EAOUT1
24
23
22
21
20
19
18
17
ROSC
RVDAC1
ROCSET1
CSS/DEL1
CVDAC1
CDRP1
RDRP1
RCP2 CCP21
CCP22
RFB22 CFB2
RFB21
CFB1 RFB12
RFB11
RCP1 CCP11
CCP12
RFB13
Figure 1 – IR3521 Application Circuit
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IR3521
12V
VCCL
To Converters
To Phase IC
VCCL & GATE
DRIVE BIAS
PHSIN Phase Clock Input to
Last Phase IC of VDD
PHSOUT
CLKOUT
2 wire
Digital
Daisy Chain
Bus to VDD
& VDDNB
Phase ICs
Power Saving
PSI_L Indicator to
VDD Phase ICs
ISHARE1
VDAC1
EAOUT1
3 Wire Analog
Control Bus
to VDD Phase
ICs
RTHERMISTOR1
Load Line NTC
Thermistor;
Locate close to
VDD Power Stage
VDD SENSE +
VDD SENSE -
To VDD
Remote
Sense
EAOUT2
VDAC2
ISHARE2
3 Wire Analog
Control Bus to
VDDNB Phase
ICs
VDDNB SENSE -
VDDNB SENSE +
To VDDNB
Remote
Sense
Page 2
V3.03


Part Number IR3521
Description XPHASE3 AMD SVID CONTROLLER
Maker International Rectifier
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IR3521 Datasheet PDF






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