DC DC Cntrlr Dual-OUT Buck Controller 48-Pin QFN T/R

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 RDS(on) 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.

• 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°C to 85° C ambient operation
• Pb-Free, RoHS, 6x6mm 48-pin, 0.4mm pitch QFN