Datasheet Product Brief
Dual Output Digital Multi-Phase Controller
IR3581
FEATURES
Ultra Low Quiescent Power Dual output 6+1 phase
PWM Controller
Intel
®
VR12, VR12.5 & Memory VR modes
Overclocking & Gaming Modes
PVI GPU VR mode
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-
scaling
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; -40
o
C to 85
o
C ambient
operation
Pb-Free, RoHS, 6x6mm 48-pin, 0.4mm pitch QFN
DESCRIPTION
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
specifications.
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.
APPLICATIONS
Intel® VR12 and VR12.5 based systems
Servers and High End Desktop CPU VRs
High Performance Graphics Processors
ORDERING INFORMATION
Base Part
Number
IR3581
IR3581
IR3581
Notes:
1.
Customer Specific Configuration File, where xx = Customer ID and yy = Configuration File (Codes assigned by IR Marketing).-
Package Type
Form
48-pin, QFN 6 mm x 6 mm
48-pin, QFN 6 mm x 6 mm
48-pin, QFN 6 mm x 6 mm
Tape and Reel
Tape and Reel
Tray
Standard Pack
Quantity
3000
3000
4900
Orderable
Part Number
IR3581MxxyyTRP
IR3581MTRPBF
IR3581MTYPBF
1
1
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April 11, 2014 | V2.2
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