IR3507 Datasheet | International Rectifier

DESCRIPTION The IR3507 Phase IC bined with an IR XPhase3 Control IC provides a full featured and flexible way to implement power solutions for the latest high performance CPUs and ASICs. The “Control” IC provides overall system control and interfaces with any number of “Phase” ICs which each drive and monitor a single TM phase of a multiphase converter. The XPhase3 architecture results in a power supply that is smaller, less expensive, and easier to design while providing higher efficiency than conventional approaches. FEATURES IR3507 PHASE IC - - - - - - - - - - - - - - - - Power State Indicator (PSI) interface provides the capability to maximize the efficiency at light loads. 7V/2A gate drivers (4A GATEL sink current) Converter output voltage up to 5.1 V (Limited to VCCL-1.4V) Loss-less inductor current sensing Feed-forward voltage mode control Integrated boot-strap synchronous PFET Only four external ponents per phase 3 wire analog bus connects Control and Phase ICs (VID, Error Amp, IOUT) 3 wire digital bus for accurate daisy-chain phase timing control without external ponents Anti-bias circuitry prevents excessive sag in output voltage during PSI de-assertion PSI input is ignored during power up 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 Small thermally enhanced 20L 4 X 4mm MLPQ package Ro HS pliant .. APPLICATION CIRCUIT 12V EAIN CSIN+ CSIN- EAIN RCS SW 15 14 13 12 11 CBST L IOUT PSI DACIN 1 2 3 4 5 IOUT PSI DACIN LGND PHSOUT GATEL PHSIN NC CLKIN PGND GATEH VOUT+ BOOST VCCL NC COUT VOUT- PHSIN PHSOUT CLKIN CVCCL VCCL Figure 1 Application Circuit Page 1 of 19 Jan 09,...