FEATURES
∙ Peak efficiency up to 93.2% 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 40A 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 IR3551 ∙ Efficient dual sided cooling
∙ Small 4mm 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
DESCRIPTION
The IR3553 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 IR3553’s superior efficiency enables smallest size and lower solution cost. The I
R3553 PCB footprint is compatible with the IR3550 (60A) and the IR3551 (50A).
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 IR3553 incorporates the Body- Braking® feature which enables reduction of output capacitors. Synchronous diode emulation mode in the IR3553 removes the zero-current detection burden from the PWM controller and increases system light-load efficiency.
The IR3553 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 IR3553 ideally suited to powering GPU and DDR memory designs and other high current applications.
PINOUT DIAGRAM
Figure 3: IR3553 Pin Diagram, Top View
ORDERING INFORMATION
TYPICAL APPLICATION DIAGRAM
IOUT
VCC BBRK#REFIN
VOUT
Figure 4: Application Circuit with Current Sense Amplifier
TYPICAL APPLICATION DIAGRAM (CONTINUED)
VCC BBRK#VOUT
profile中文Figure 5: Application Circuit without Current Sense Amplifier
FUNCTIONAL BLOCK DIAGRAM
PHSFLT#REFIN
PWM VIN SW
SW SW SW SW
SW TGND BOOST IOUT VCC
BBRK#GATEL CSIN+LGND
PGND
Figure 6: IR3553 Functional Block Diagram
PIN DESCRIPTIONS
ABSOLUTE MAXIMUM RATINGS
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications are not implied.
Note:
1.  Maximum BOOST – SW = 8V.
2. Maximum VIN – SW = 25V.
3.    All the maximum voltage ratings are referenced to PGND (Pins 12 and 13).
Note:
1.  Thermal Resistance (θJA) is measured with the component mounted on a high effective thermal conductivity test board in free air.
Refer to International Rectifier Application Note AN-994 for details.

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