DESCRIPTION

The IR3087 Phase IC combined with an IR XPhase™ 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 XPhaseTM 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™ 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 Compensation

• 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™ disables Synchronous MOSFET for improved transient response and prevents negative output voltage at converter turn-off

• Opti-Phase™ reduces the number of phases for improved light to medium load efficiency

• OVP comparator with 150ns response

• Programmable Phase Over-Temperature Detection

• Small thermally enhanced 20L MLPQ package