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International Rectifier Electronic Components Datasheet

IR3523 Datasheet

DUAL OUTPUT CONTROLLER

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IR3523
DATASHEET
XPHASE3TM DUAL OUTPUT CONTROL IC
DESCRIPTION
The IR3523 Control IC provides a full featured and flexible way to implement a complete dual output DDR &
CPU VTT multiphase power solution for Intel VR11.1 motherboards. Each output interfaces with any number of
xPHASE3TM Phase ICs each driving and monitoring a single phase. Output 1 includes a 3 bit VR11.x VID, 1.1V
boot voltage and droop to implement the CPU VTT rail which is typically 1 phase. Output 2 includes a 3 bit VID for
margining and supports any number of phases and DDR DIMM modules. The xPHASE3TM architecture results in a
power supply that is smaller, less expensive, and easier to design while providing higher efficiency than
conventional approaches.
INDEPENDENT FEATURES FOR BOTH OUTPUT 1 & 2
Enable Input
Power Good (PG) Output
0.5% overall system set point accuracy
Programmable Softstart
High speed error amplifier with wide bandwidth of 30MHz and fast slew rate of 12V/us
Remote sense amplifier provides differential sensing and requires less than 50uA bias current
Programmable over current threshold triggers constant converter output current limit during start-up and
hiccup protection during normal operation
Over voltage condition communicated to phase ICs by IIN (ISHARE) and system by ROSC/OVP pins
Detection and protection of open remote sense lines
OUTPUT 1 ADDITIONAL FEATURES
3 bit Intel VR11.x VID (VID4, VID3, VID2)
Programmable VID offset
1.1 V Boot Voltage
Programmable output impedance
Programmable VID-on-the-Fly Slew Rate
OUTPUT 2 ADDITIONAL FEATURES
3 bit VID provides 1.5 V with ±150mV margining
Programmable VID-on-the-Fly Slew Rate
FEATURES SHARED BY BOTH OUTPUTS 1 & 2
Programmable per phase switching frequency of 250kHz to 1.5MHz
Daisy-chain digital phase timing provides accurate phase interleaving without external components
Gate Drive and IC bias linear regulator control with programmable output voltage and UVLO
Over voltage signal to system with over voltage detection during powerup and normal operation
ORDERING INFORMATION
Device
IR3523MTRPBF
* IR3523MPBF
* Samples only
Package
40 Lead MLPQ (6 x 6 mm body)
40 Lead MLPQ (6 x 6 mm body)
Order Quantity
3000 per reel
100 piece strips
Page 1 of 37
June 20, 2008


International Rectifier Electronic Components Datasheet

IR3523 Datasheet

DUAL OUTPUT CONTROLLER

No Preview Available !

IR3523
APPLICATION CIRCUIT
12V
PG2
VID2_0
VID2_1
VID2_2
Q1
RVCCLDRV
RVCCLFB1 RVCCLFB2
CVCCL
4.7uF
12V
VCCL
To Pow er Stage
To Phase IC
VCCL & GATE
DRIVE BIAS
PHSIN
PHSOUT
CLKOUT
3 w ire Digital
Daisy Chain Bus
to Phase ICs
VID1_4
VID1_3
VID1_2
ENABLE 2
ENABLE 1
1
2
3
4
5
6
CVDAC1
CSS/DEL2 7
RVDAC2
8
ROCSET2 9
10
VID1_4
VID1_3
VID1_2
ENABLE2
ENABLE1
IIN2
SS/DEL2
VDAC2
OCSET2
EAOUT2
IR3523
CONTROL
IC
NC 30
LGND 29
PG1 28
ROSC/OVP 27
VDRP1 26
IIN1 25
SS/DEL1 24 RVDAC1
23
VDAC1
ROCSET1
OCSET1 22
CSS/DEL1
CVDAC1
EAOUT1 21
CDRP1
RDRP1
ROSC
PG1
OVP FLAG
ISHARE1
VDAC1
EAOUT1
3 Wire Analog
Control Bus to
Output 1 Phase
ICs
To Output 2
Remote
Sense
VOUT2 SENSE +
VOUT2 SENSE -
RCP2 CCP21
CCP22
RFB22 CFB2
RFB21
CFB1 RFB12
RFB11
RCP1 CCP11
CCP12
RTHERMISTOR1
Load Line NTC
Thermistor; Locate
close to Output 1
Pow er Stage
RFB13
Figure 1 – IR3523 Application Circuit
VOUT1 SENSE + To Output 2
VOUT1 SENSE - Remote Sense
EAOUT2
VREF2
ISHARE2
3 Wire Analog
Control Bus to
Output 2 Phase
ICs
PIN DESCRIPTION
PIN#
1-3
4
5
6
7
8
9
10
11,20,30
PIN SYMBOL
VID1_4,
VID1_3, VID1_2
ENABLE2
ENABLE1
IIN2
SS/DEL2
VDAC2
OCSET2
EAOUT2
NC
VID inputs for Output 1
PIN DESCRIPTION
Enable input. A logic low applied to this pin puts output 2 into fault mode. A
logic high signal on this pin enables output 2. Do not float as the logic state will
be undefined.
Enable input. A logic low applied to this pin puts output 2 into fault mode. A
logic high signal on this pin enables output 2. Do not float as the logic state will
be undefined.
Output 2 average current input from the output 2 phase IC(s). This pin is also
used to communicate over voltage condition to the output 2 phase ICs.
Programs output 2 startup and over current protection delay timing. Connect an
external capacitor to LGND to program.
Output 2 reference voltage. Connect an external RC network to LGND to
provide compensation for the internal buffer amplifier
Programs the output 2 constant converter output current limit and hiccup over-
current threshold through an external resistor tied to VDAC2 and an internal
current source from this pin. Over-current protection can be disabled by
connecting a resistor from this pin to VDAC2 to program the threshold higher
than the possible signal into the IIN pin from the phase ICs but no greater than
5V (do not float this pin as improper operation will occur).
Output 2 error amplifier output
No Connection
Page 2 of 37
June 20, 2008


Part Number IR3523
Description DUAL OUTPUT CONTROLLER
Maker International Rectifier
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IR3523 Datasheet PDF






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