IR3506 Datasheet | International Rectifier

DESCRIPTION The IR3506 Phase IC bined with IR3522 x PHASE3 Control ICs implements a full featured DDR3 power solution. The IR3522 provides control functions for both the VDDR and VTT power rails and interfaces with any number of IR3506 Phase ICs each driving and monitoring a single phase to power any number of DDR3 TM 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 - - - - - - - - - - - - - - - - Power State Indicator (PSI) interface provides the capability to maximize efficiency at light loads Anti-bias circuitry 7V/2A gate drivers (4A GATEL sink current) Support loss-less inductor current sensing Phase delay DFF bypassed during PSI assertion mode to improve output ripple performance Over-current protection during PSI assertion mode operation Integrated boot-strap synchronous PFET Only four IC related external ponents per phase 3 wire analog bus connects Control and Phase ICs (VDAC, Error Amp, IOUT) 3 wire digital bus for accurate daisy-chain phase timing control without external ponents Debugging function isolates phase IC from the converter Self-calibration of PWM ramp, current sense amplifier, and current share amplifier Single-wire bidirectional average current sharing Soft-stop turn-off to insure VDDR and Vtt tracking Small thermally enhanced 16L 3 x 3mm MLPQ package Ro HS pliant .. APPLICATION CIRCUIT 12V U1 CSIN+ CSIN- EAIN U11 SW 12 CIN 11 CBST 10 9 U12 COUT L GATEL PHSIN PHSOUT 7 Wire Bus to Control IC IOUT DACIN LGND 2 3 4 IR3506 PHASE IC CLKIN PGND GATEH BOOST VCCL VOUT+ VOUTCVCCL VCCL Page 1 of...