50A Exposed-Top Integrated PowIRstage® FEATURES IR3578 DESCRIPTION Integrated driver, Schottky diode, control MOSFET and synchronous MOSFET The IR3578 exposed-top integrated PowIRstage® contains a synchronous buck gate driver IC which is copacked with control and synchronous MOSFETs and a Schottky diode to further improve efficiency. The package is optimized for PCB layout, heat transfer, driver/MOSFET control timing, and minimal switch node ringing when layout guidelines are followed. The paired gate driver and MOSFET combination enables higher efficiency at lower output voltages required by cutting edge CPU, GPU, ASIC and DDR memory designs. 5mV / A on-chip MOSFET current sensing with temperature compensated reporting Input voltage (VIN) range of 4.5V to 15V VCC and VDRV supply of 4.5V to 7V Output voltage range from 0.25V up to 5.5V Output current capability of 50A Operation up to 1.0MHz VCC under voltage lockout (UVLO) 8mV / oC temperature analog output and thermal flag pull-up to 3.3V Over temperature protection (OTP) Cycle-by-cycle self-preservation over current protection (OCP) MOSFET phase fault detection and flag Preliminary overvoltage protection (Pre-OVP) Compatible with 3.3V tri-state PWM Input Body-Braking™ load transient support through PWM Tri-state Diode emulation mode (DEM) for improved light load efficiency The IR3578 PowIRstage® internal MOSFET current sense algorithm with integrated temperature compensation achieves superior current sense accuracy vs. best-in-class controller based Inductor DCR sense methods. Other features include preliminary overvoltage protection and flag, internal cycle-by-cycle self-preservation over current protection and flag, phase fault flag, over temperature protection and flag, and internal package temperature reporting. 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. When combined with IR’s digital controllers, the IR3578 incorporates the Body-Braking™ feature through PWM tri-state which enables reduction of output capacitors. Synchronous diode-emulation mode is also supported through a built-in ZCD_EN# enabled zero-cross detect circuit in the IR3578 which increases system light-load efficiency. Enhanced top side cooling through exposed pad Small 6mm x 6mm x 0.65mm PQFN package Lead free RoHS compliant package APPLICATIONS High frequency, high current, low profile DCDC converters Voltage Regulators for CPUs, GPUs, ASICs, and DDR memory arrays The IR3578 is optimized for CPU core power delivery in server applications. The ability to meet the stringent requirements of the server market also makes the IR3578 ideally suited for powering GPU, ASIC, DDR memory, and other high current designs. ORDERING INFORMATION Base Part Number Package Type IR3578 PQFN 6 mm x 6 mm 1 Standard Pack Form Quantity Orderable Part Number Tape and Reel 3000 IR3578MTRPBF www.irf.com | © 2014 International Rectifier May 7, 2014 | V3.0