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IR3551MPBF Datasheet(PDF) 1 Page - International Rectifier |
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IR3551MPBF Datasheet(HTML) 1 Page - International Rectifier |
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1 / 22 page  September 10, 2012 | FINAL DATASHEET 1 IR3551 50A Integrated PowIRstage® FEATURES Peak efficiency up to 94.5% 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 up to 3.3V Output current capability of 50A DC Operation up to 1.0MHz Integrated current sense amplifier VCC under voltage lockout Thermal flag Body-Braking® load transient support Diode-emulation high efficiency mode Compatible with 3.3V PWM logic and VCC tolerant Compliant with Intel DrMOS V4.0 PCB footprint compatible with IR3550 and IR3553 Efficient dual sided cooling Small 5mm x 6mm x 0.9mm PQFN package Lead free RoHS compliant package APPLICATIONS Voltage Regulators for CPUs, GPUs, and DDR memory arrays High current, low profile DC-DC converters BASIC APPLICATION SW PWM VIN PGND VCC VCC BOOST VIN VOUT PWM CSIN+ CSIN- 4.5V to 7V LGND IOUT IOUT BBRK# BBRK# REFIN REFIN 4.5V to 15V IR3551 PHSFLT# PHSFLT# Figure 1: IR3551 Basic Application Circuit DESCRIPTION The IR3551 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 IR3551’s superior efficiency enables smallest size and lower solution cost. The IR3551 PCB footprint is compatible with the IR3550 (60A) and the IR3553 (40A). Integrated current sense amplifier achieves superior current sense accuracy and signal to noise ratio vs. best-in- class controller based Inductor DCR sense methods. The IR3551 incorporates the Body-Braking® feature which enables reduction of output capacitors. Synchronous diode emulation mode in the IR3551 removes the zero-current detection burden from the PWM controller and increases system light-load efficiency. The IR3551 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 IR3551 ideally suited to powering GPU and DDR memory designs and other high current applications. Figure 2: Typical IR3551 Efficiency & Power Loss (See Note 2 on Page 8) 75 77 79 81 83 85 87 89 91 93 95 0 5 10 15 20 25 30 35 40 45 50 Output Current (A) 0 2 4 6 8 10 12 14 16 18 20 |
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