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The IR3550 integrated PowIRstage is a synchronous buck gate driver co-packed with a control MOSFET and a synchronous MOSFET with integrated Schottky diode. It is optimized internally for PCB layout, heat transfer and driver/MOSFET timing. Custom designed gate driver and MOSFET combination enables higher efficiency at lower output voltages required by cutting edge CPU, GPU and DDR memory designs. Up to 1.0MHz switching frequency enables high performance transient response, allowing miniaturization of output inductors, as well as input and output capacitors while maintaining industry leading efficiency. The IR3550’s superior efficiency enables smallest size and lower solution cost. The IR3550 PCB footprint is compatible with the IR3551 (50A) and the IR3553 (40A). Integrated current sense amplifier achieves superior current sense accuracy and signal to noise ratio vs. best-inclass controller based Inductor DCR sense methods. The IR3550 incorporates the Body-Braking feature which enables reduction of output capacitors. Synchronous diode emulation mode in the IR3550 removes the zero-current detection burden from the PWM controller and increases system light-load efficiency. The IR3550 is optimized specifically for CPU core power delivery in server applications. The ability to meet the stringent requirements of the server market also makes the IR3550 ideally suited to powering GPU and DDR memory designs and other high current applications.
Peak efficiency up to 95% at 1.2V
Integrated driver, control MOSFET, synchronous MOSFET and Schottky diode
Input voltage (VIN) operating range up to 15V
Output voltage range from 0.25V to Vcc-2.5V, or to 5.5V if internal current sense amplifier is not used