IR3581 Overview
The IR3581 is a dual-loop digital multi-phase buck controller designed for CPU voltage regulation, and is fully pliant with Intel® VR12 and pliant 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.
IR3581 Key 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 autoscaling
- Fault Protection: OVP, UVP, OCP, OTP, CAT FLT