IR3555A FEATURES DESCRIPTION 60A Integrated PowIRstage
60A Integrated PowIRstage®
FEATURES
IR3555A
DESCRIPTION
 Integrated driver, Schottky diode, control
MOSFET and synchronous MOSFET
The IR3555A integrated PowIRstage® contains a
synchronous buck gate driver IC which is co-packed
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 60A
 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
The IR3555A 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 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.
 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 When combined with IR’s digital controllers, the
IR3555A 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 IR3555A which
increases system light-load efficiency.
 Efficient dual sided cooling
 Small 6mm x 6mm x 0.9mm 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 IR3555A is optimized for CPU core power delivery
in server applications. The ability to meet the stringent
requirements of the server market also makes the
IR3555A ideally suited for powering GPU, ASIC, DDR
memory, and other high current designs.
ORDERING INFORMATION
Base Part
Number
Package Type
IR3555A
PQFN 6 mm x 6 mm
1
Standard Pack
Form
Quantity
Orderable
Part Number
Tape and Reel
3000
IR3555AMTRPBF
www.irf.com | © 2014 International Rectifier
May 9, 2014 | V3.0
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