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