What is IR3581?

This electronic component, produced by the manufacturer "International Rectifier", performs the same function as "Dual Output Digital Multi-Phase Controller".

IR3581 Datasheet PDF - International Rectifier

Part Number IR3581
Description Dual Output Digital Multi-Phase Controller
Manufacturers International Rectifier 
Logo International Rectifier Logo 

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Datasheet Product Brief
IR3581  Dual Outpu  t Digital Multi-Phase Controller
Ultra Low Quiescent Power Dual output 6+1 phase
PWM Controller
Intel® VR12, VR12.5 & Memory VR modes
Overclocking & Gaming Modes
Switching frequency from 194kHz to 2MHz per phase
in 56 steps
IR Efficiency Shaping Features including Variable
Gate Drive, Dynamic Phase Control and Automatic
Power State Switching
Programmable 1-phase or 2-phase operation for
Light Loads and Active Diode Emulation for Very
Light Loads
IR Adaptive Transient Algorithm (ATA) on both loops
minimizes output bulk capacitors and system cost
Auto-Phase Detection with PID Coefficient auto-
Fault Protection: OVP, UVP, OCP, OTP, CAT FLT
I2C/SMBus/PMBus system interface for reporting of
Temperature, Voltage, Current & Power telemetry for
both loops
Multiple Time Programming (MTP) with integrated
charge pump for easy non-volatile programming
Compatible with 3.3V tri-state drivers and IR ATL
mode drivers
+3.3V supply voltage; -40oC to 85oC ambient
Pb-Free, RoHS, 6x6mm 48-pin, 0.4mm pitch QFN
Intel® VR12 and VR12.5 based systems
Servers and High End Desktop CPU VRs
High Performance Graphics Processors
The IR3581 is a dual-loop digital multi-phase buck
controller designed for CPU voltage regulation,
and is fully compliant with Intel® VR12 and
compliant with VR12.5 Rev 1.3 PWM
The IR3581 includes IR’s Efficiency Shaping
Technology to deliver exceptional efficiency at
minimum cost across the entire load range. IR
Variable Gate Drive optimizes the MOSFET gate
drive voltage based on real-time load current. IR’s
Dynamic Phase Control adds/drops phases based
upon load current. The IR3581 can be configured
to enter 1 or 2-phase operation and active diode
emulation mode automatically or by command.
IR’s unique Adaptive Transient Algorithm (ATA),
based on proprietary non-linear digital PWM
algorithms, minimizes output bulk capacitors.
IR3581 has 127 possible address values for both
the PMBus and I2C bus interfaces. The device
configuration can be easily defined using the IR
Digital Power Design Center (DPDC) GUI, and is
stored in the on-chip Non-Volatile Memory (NVM).
This reduces external components and minimizes
the package size.
The IR3581 provides extensive OVP, UVP, OCP,
OTP & CAT FLT fault protection, and includes
thermistor based temperature sensing or per
phase temperature reporting when using the IR
powIRstage. The controller is designed to work
with either Rdson current sense PowIRstages or
with DCR current sense.
The IR3581 also includes numerous VR design
simplifying and differentiating features, like register
diagnostics, which enable fast time-to-market.
Base Part
Package Type
48-pin, QFN 6 mm x 6 mm
Standard Pack
Tape and Reel
Part Number
48-pin, QFN 6 mm x 6 mm
Tape and Reel
48-pin, QFN 6 mm x 6 mm
1. Customer Specific Configuration File, where xx = Customer ID and yy = Configuration File (Codes assigned by IR Marketing).-
1 | © 2014 International Rectifier
April 11, 2014 | V2.2

IR3581 equivalent
Datasheet Product Brief
IR3581  Dual Outpu  t Digital Multi-Phase Controller
Data and specifications subject to change without notice.
This product will be designed and qualified for the Industrial market.
Qualification Standards can be found on IR’s Web site.
IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105
TAC Fax: (310) 252-7903
Visit us at for sales contact information.
5 | © 2014 International Rectifier
April 11, 2014 | V2.2


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Featured Datasheets

Part NumberDescriptionManufacturers
IR3581The function is Dual Output Digital Multi-Phase Controller.International Rectifier
International Rectifier

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