IR3087PBF Datasheet | International Rectifier

DESCRIPTION The IR3087 Phase IC bined with an IR XPhase TM 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 phase of a multiphase converter. The XPhase TM architecture results in a power supply that is smaller, less expensive, and easier to design while providing higher efficiency than conventional approaches. .. The IR3087 with Opti-Phase TM is intended for applications demanding increased efficiency under medium to light load conditions. Both gate drivers will drive low at a programmable output current threshold. This effectively disconnects the phase from the load eliminating power losses due to switching and circulating currents. FEATURES - - - - - - - - - - - - - 2.5A Average Gate Drive Current Loss-Less Inductor Current Sense Internal Inductor DCR Temperature pensation Programmable Phase Delay Programmable Feed-Forward Voltage Mode PWM Ramp Sub 100ns Minimum Pulse Width supports 1MHz per-phase operation Current Sense Amplifier drives a single wire Average Current Share Bus Current Share Amplifier reduces PWM Ramp slope to ensure sharing between phases Body Braking TM disables Synchronous MOSFET for improved transient response and prevents negative output voltage at converter turn-off Opti-Phase TM reduces the number of phases for improved light to medium load efficiency OVP parator with 150ns response Programmable Phase Over-Temperature Detection Small thermally enhanced 20L MLPQ package APPLICATION CIRCUIT VGATE 12V VRHOT DAC RBIASIN 20k 20 19 18 17 ROP1 ROP2 RCSCCS+ CCSRCS+ BIAS RPHASE1 DBST OPTIPHS BIASIN DACIN CSIN+ CSIN- CBST CIN 5 Wire Analog Bus From Control IC RMPIN+ RMPINHOTSET VRHOT ISHARE SP EAIN VCCH GATEH PGND GATEL VCCL LGND VCC 15 14 13 12 11 L RAMP 2 3 4 IR3087 PHASE IC PWMRMP ISHARE RPHASE2 CVCCL...