IR3575 Datasheet, PDF (1/23 Pages) International Rectifier – 60A Exposed Top Integrated PowIRstage

60A Exposed Top Integrated PowIRstage® _IR3575
FEATURES
 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 up to 3.3
 Output current capability of 60A 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 IR3576
 Enhanced top side cooling through exposed pad
 Small 6mm x 6mm x 0.65mm 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
VCC
4.5V to 7V
PHSFLT#
PWM
BBRK#
REFIN
IOUT
IR3575
VCC
VIN
BOOST
PHSFLT#
PWM
BBRK#
REFIN
IOUT
LGND
SW
CSIN+
CSIN-
PGND
VIN
4.5V to 15V
VOUT
Figure 1: IR3575 Basic Application Circuit
DESCRIPTION
The IR3575 exposed-top 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 IR3575’s
superior efficiency enables smallest size and lower solution
cost. The IR3575 PCB footprint is compatible with the
IR3576 (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 IR3575 incorporates the Body-Braking™ feature which
enables reduction of output capacitors and is activated
quickly. Synchronous diode emulation mode in the IR3575
removes the zero-current detection burden from the PWM
controller and increases system light-load efficiency.
The IR3575 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 IR3575 ideally suited to powering GPU and DDR
memory designs and other high current applications.
95
93
91
89
87
85
83
81
79
77
75
0
20
18
16
14
12
10
8
6
4
2
0
5 10 15 20 25 30 35 40 45 50 55 60
Output Current (A)
Figure 2: Typical IR3575 Efficiency & Power Loss (See Note 2 on Page 8)
1 June 20, 2012 | FINAL DATASHEET | V1.1