IR3522 Datasheet | International Rectifier

DESCRIPTION The IR3522 Control IC bined with IR3506 x PHASE3TM 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 TM a single phase to power any number of DDR3 DIMMs. The x PHASE3 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 munication 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 50u A bias current Pin programmable per phase switching frequency of 250k Hz to 1.5MHz plete protection including over-current, over-voltage, open remote sense, and open control APPLICATION CIRCUIT 12V VCCL CVCCL 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 Phase ICs .. PGOOD PHSIN PHSOUT 28 30 29 26 32 31 27 25 CLKOUT SCL SDA VI D1 VI D0 VCCL RPGBIAS 1 2 SD A PGBIAS EN ABLE IIN 2 AD DR1 AD DR2 OCSET2 VOSEN2+ VOSEN1+ VOSEN2VOSEN1EAOUT2 VOUT2 FB2 PHSOUT CLKOUT PGOOD PHSIN LGND ROSC 24 23 22 21 20 RVR EF 19 18 17...