IRF IR3556 50a integrated powirstage Datasheet

50A Integrated PowIRstage®
FEATURES
IR3556
DESCRIPTION
 Integrated driver, Schottky diode, control
MOSFET and synchronous MOSFET
The IR3556 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 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 IR3556 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 IR3556
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 IR3556 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 IR3556 is optimized for CPU core power delivery in
server applications. The ability to meet the stringent
requirements of the server market also makes the
IR3556 ideally suited for powering GPU, ASIC, DDR
memory, and other high current designs.
ORDERING INFORMATION
Base Part
Number
Package Type
IR3556
PQFN 6 mm x 6 mm
1
Standard Pack
Form
Quantity
Orderable
Part Number
Tape and Reel
3000
IR3556MTRPBF
www.irf.com | © 2014 International Rectifier
May 7, 2014 | V3.0
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