FEATURES

 Dual output 3+1 phase PWM Controller
 Easiest layout and fewest pins in the industry
 Fully supports AMD® SVI1 & SVI2 with dual
OCP and Intel® VR12 & VR12.5
 Overclocking & Gaming Mode
 Switching frequency from 200kHz to 2MHz
per phase
 IR Efficiency Shaping Features including
Dynamic Phase Control and Automatic Power
State Switching
 Programmable 1-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 autocompensation
 Per-Loop Fault Protection: OVP, UVP, OCP,
OTP
 I2C/SMBus/PMBus system interface for
telemetry of Temperature, Voltage, Current &
Power for both loops
 Multiple Time Programming (MTP) with
integrated charge pump for easy custom
configuration
 Compatible with IR ATL and 3.3V tri-state
Drivers
 +3.3V supply voltage; -40°C to 85°C ambient
operation
 Pb-Free, Halogen Free, RoHS, 6x6mm,
40-pin, 0.5 mm pitch QFN

DESCRIPTION

The IR35211 is a dual loop digital multi-phase buck
controller designed for CPU voltage regulation and is fully
compliant to AMD® SVI1 & SVI2 Rev 1.2 & Intel©
VR12
Rev 1.5 PWM specification and VR12.5 Rev 1.3 PWM
specification.
The IR35211 includes IR’s Efficiency Shaping
Technology to deliver exceptional efficiency at minimum
cost across the entire load range. IR’s Dynamic Phase
Control adds/drops active phases based upon load
current and can be configured to enter 1-phase operation
and 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 and Multiple Time
Programmable (MTP) storage saves pins and enables a
small package size. Device configuration and fault
parameters are easily defined using the IR Digital Power
Design Center (DPDC) GUI and stored in on-chip MTP.
The IR35211 provides extensive OVP, UVP, OCP and
OTP fault protection and includes thermistor based
temperature sensing with VRHOT signal.
The IR35211 includes numerous features like register
diagnostics for fast design cycles and platform
differentiation, simplifying VRD design and enabling
fastest time-to-market (TTM) with “set-and-forget”
methodology.

APPLICATIONS
 AMD® SVI1 & SVI2, Intel® VR12 & VR12.5 based
systems
 Desktop & Notebook CPU VRs
 High Performance Graphics Processors