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International Rectifier Electronic Components Datasheet

IR3522 Datasheet

DDR & VTT CONTROLLER

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IR3522
DATA SHEET
XPHASE3TM DDR & VTT CONTROL IC
DESCRIPTION
The IR3522 Control IC combined with IR3506 xPHASE3TM Phase ICs implements a full featured DDR3
power solution. The IR3522 provides control functions for both the VTT (single phase) and VDDR
(multiphase) power rails which can interfaces with any number of IR3506 ICs each driving and monitoring
a single phase to power any number of DDR3 DIMMs. The xPHASE3TM architecture delivers a power
supply that is smaller, more flexible, and easier to design while providing higher efficiency than
conventional approaches.
FEATURES
I2C interface programs 1.025V< VREF1<1.612V, the VDD output voltage reference
I2C also programs the VTT tracking ratio ± 25 %, and provides digital ON/OFF control
Four different I2C addresses are selectible using 2 ADDR pins
Four different VREF1 voltages are selectible using 2 VID pins if I2C communication is not available
VTT tracking defaults to ½ the VDD Remote Sense Amp output voltage
Power Good output driven by an external bias input
VDD to VTT overvoltage protection
Soft-Stop turn-off to ensure VDDR and Vtt tracking
Fault activated Crowbar pin to drive external NMOS devices for external output voltage protection
Pin programmable slew rate of I2C programmed VREF1 voltage transitions
0.5% overall VDD system set point accuracy
Remote sense amplifiers provide differential sensing and requires less than 50uA bias current
Pin programmable per phase switching frequency of 250kHz to 1.5MHz
Complete protection including over-current, over-voltage, open remote sense, and open control
APPLICATION CIRCUIT
12V
VCCL
www.DataSheet4U.com
PGOOD
SCL
SDA
CVCCL
12V To Converters
VCCL To Phase IC
VCCL & GATE
DRIVE BIAS
Phase Clock Input to
PHSIN Last Phase IC of VDD
PHSOUT
CLKOUT
2 wire Digital
Daisy Chain Bus
to Phase ICs
ENABLE
RPGBIAS
ROCSET2
1 SD A
2 PGBIAS
3 EN ABLE
4
IIN2
5 AD DR1
6
AD DR2
7 OCSET2
8 EAOUT2
IR3522
CONTROL
IC
LGND
ROSC
CROWBAR
IIN1
SS/ DEL1
VREF 1
OCSET1
EAOUT1
24
23
22
21
20
19
18
17
ROSC
RVR EF
ROCSET1
CSS/DEL
CVREF
Drives NMOS crowbar
CROWBAR devices at VTT and
VDDR rails
To Vtt
Remote
Sense
VTT SENSE +
VTT SENSE -
Page 1
RCP2 CCP21
CCP22
RFB22 CFB2
R FB21
CFB1 RFB12
RFB11
R CP1 CCP11
CCP12
Figure 1 – IR3522 Application Circuit
ISHARE1
EAOUT1
VREF1
EAOUT2
ISHARE2
5 Wire Analog
Phase IC
Control Bus
DDR SENSE +
DDR SENSE -
To VDD
Remote
Sense
V3.01


International Rectifier Electronic Components Datasheet

IR3522 Datasheet

DDR & VTT CONTROLLER

No Preview Available !

IR3522
ORDERING INFORMATION
Device
IR3522MTRPBF
* IR3522MPBF
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
* Samples only
PIN DESCRIPTION
PIN# PIN SYMBOL
1 SDA
2 PGBIAS
3 ENABLE
4 IIN2
5 ADDR1
6 ADDR2
7 OCSET2
www.DataShee8t4U.com EAOUT2
9 FB2
10 VOUT2
11 VOSEN2+
12 VOSEN2-
13 VOSEN1-
14 VOSEN1+
15 VOUT1
16 FB1
17 EAOUT1
18 OCSET1
19 VREF1
20 SS/DEL1
PIN DESCRIPTION
SDA (Serial Data) is a bidirectional signal that is an input and open drain output for
both master (I2C controller) and slave (IR3522). SDA requires a pull resistor to a
bias voltage and should not be floated.
Input to provide bias to the Power Good output transistor directly from the converter
input voltage. Enables the Power Good output to assert even if there is no bias
supplied to the VCCL pin. Internal voltage clamp protects the pin. Do not exceed
100 uA of pull-up current.
Enable input. A logic low applied to this pin puts the IC into fault mode. A logic high
on the pin resets and enables the converter. Do not float this pin as the logic state
will be undefined.
Output 2 average current input from the output 2 phase IC(s).
Digital input to program bit 1 of the 2 bit address code with internal pull-up. Connect
to LGND for logic “0”, float for logic “1”
Digital input to program bit 2 of the 2 bit address code with internal pull-up. Connect
to LGND for logic “0”, float for logic “1”
Programs the output 2 constant converter output current limit through an external
resistor tied to VREF1 and an internal current source from this pin. Over-current
protection can be disabled by over sizing the resistor value to program the threshold
higher than IIN2 pin possible signal amplitude, but no greater than 5V (do not float
this pin as improper operation will occur).
Output of the output 2 error amplifier.
Inverting input to the output 2 error amplifier.
Output 2 remote sense amplifier output.
Output 2 remote sense amplifier input. Connect to output at the load.
Output 2 remote sense amplifier input. Connect to ground at the load.
Output 1 remote sense amplifier input. Connect to ground at the load.
Output 1 remote sense amplifier input. Connect to output at the load.
Output 1 remote sense amplifier output. Provides reference to Error Amp2.
Inverting input to the output 1 error amplifier.
Output of the output 1 error amplifier.
Programs the output 1 constant converter output current limit through an external
resistor tied to VREF1 and an internal current source from this pin. Over-current
protection can be disabled by over sizing the resistor value to program the threshold
higher than IIN2 pin possible signal amplitude, but no greater than 5V (do not float
this pin as improper operation will occur).
Reference voltage programmed by the I2C inputs and error amplifier non-inverting
input. Connect an external RC network to LGND to program dynamic VID slew rate
and provide compensation for the internal buffer amplifier.
Connect an external capacitor to LGND to program startup and Fault delay timing
Page 2
V3.01


Part Number IR3522
Description DDR & VTT CONTROLLER
Maker International Rectifier
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IR3522 Datasheet PDF






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