Datasheet Product Brief Dual Output Digital Multi-Phase Controller IR3581 FEATURES DESCRIPTION Ultra Low Quiescent Power Dual output 6+1 phase The IR3581 is a dual-loop digital multi-phase buck PWM Controller controller designed for CPU voltage regulation, and is fully compliant with Intel VR12 and Intel VR12, VR12.5 & Memory VR modes compliant with VR12.5 Rev 1.3 PWM Overclocking & Gaming Modes specifications. PVI GPU VR mode The IR3581 includes IRs Efficiency Shaping Switching frequency from 194kHz to 2MHz per phase Technology to deliver exceptional efficiency at in 56 steps minimum cost across the entire load range. IR IR Efficiency Shaping Features including Variable Variable Gate Drive optimizes the MOSFET gate Gate Drive, Dynamic Phase Control and Automatic drive voltage based on real-time load current. IRs Power State Switching Dynamic Phase Control adds/drops phases based upon load current. The IR3581 can be configured Programmable 1-phase or 2-phase operation for to enter 1 or 2-phase operation and active diode Light Loads and Active Diode Emulation for Very emulation mode automatically or by command. Light Loads IR Adaptive Transient Algorithm (ATA) on both loops IRs unique Adaptive Transient Algorithm (ATA), minimizes output bulk capacitors and system cost based on proprietary non-linear digital PWM Auto-Phase Detection with PID Coefficient auto- algorithms, minimizes output bulk capacitors. scaling IR3581 has 127 possible address values for both Fault Protection: OVP, UVP, OCP, OTP, CAT FLT the PMBus and I2C bus interfaces. The device I2C/SMBus/PMBus system interface for reporting of configuration can be easily defined using the IR Temperature, Voltage, Current & Power telemetry for Digital Power Design Center (DPDC) GUI, and is both loops stored in the on-chip Non-Volatile Memory (NVM). This reduces external components and minimizes Multiple Time Programming (MTP) with integrated the package size. charge pump for easy non-volatile programming Compatible with 3.3V tri-state drivers and IR ATL The IR3581 provides extensive OVP, UVP, OCP, mode drivers OTP & CAT FLT fault protection, and includes o o +3.3V supply voltage -40 C to 85 C ambient thermistor based temperature sensing or per operation phase temperature reporting when using the IR powIRstage. The controller is designed to work Pb-Free, RoHS, 6x6mm 48-pin, 0.4mm pitch QFN with either Rdson current sense PowIRstages or with DCR current sense. APPLICATIONS The IR3581 also includes numerous VR design Intel VR12 and VR12.5 based systems simplifying and differentiating features, like register Servers and High End Desktop CPU VRs diagnostics, which enable fast time-to-market. High Performance Graphics Processors ORDERING INFORMATION Standard Pack Base Part Orderable Package Type Number Part Number Form Quantity 1 IR3581 48-pin, QFN 6 mm x 6 mm Tape and Reel 3000 IR3581MxxyyTRP IR3581 48-pin, QFN 6 mm x 6 mm Tape and Reel 3000 IR3581MTRPBF IR3581 48-pin, QFN 6 mm x 6 mm Tray 4900 IR3581MTYPBF Notes: 1. Customer Specific Configuration File, where xx = Customer ID and yy = Configuration File (Codes assigned by IR Marketing).- www.irf.com 2014 International Rectifier April 11, 2014 V2.2 1 Datasheet Product Brief Dual Output Digital Multi-Phase Controller IR3581 ORDERING INFORMATION IR3581M P/PBF Lead Free TR Tape & Reel / TY - Tray yy Configuration File ID xx Customer ID Package Type (QFN) Figure 1: IR3581 Pin Diagram www.irf.com 2014 International Rectifier April 11, 2014 V2.2 2