IR3555

60A Integrated PowIRstage

®

May 7, 2014 | V3.0

1

FEATURES

 Integrated driver, Schottky diode, control

MOSFET and synchronous MOSFET

 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)

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 

 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 DC-

DC converters

 Voltage Regulators for CPUs, GPUs, ASICs,

and DDR memory arrays

DESCRIPTION

 

The IR3555 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.

The IR3555 PowIRstage

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 IR3555

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 IR3555 which increases system light-load

efficiency.

The IR3555 is optimized for CPU core power delivery in

server applications. The ability to meet the stringent

requirements of the server market also makes the

IR3555 ideally suited for powering GPU, ASIC, DDR

memory, and other high current designs.

ORDERING INFORMATION

Base Part

Number

Package Type

Standard Pack

Orderable

Part Number

Form

Quantity

IR3555

PQFN 6 mm x 6 mm

Tape and Reel

3000

IR3555MTRPBF