DESCRIPTION

· The IR3541 and CHL8325 A/B are dual-loop digital multi-phase buck controllers driving up to 5 phases.

· Fully compliant with Intel® VR12 and AMD® SVI standards on both loops.

· Features Vtt tracking function for DDR memory.

· Utilizes NVM storage to save pins and enable a compact package size.

· Incorporates IR Efficiency Shaping Technology for high efficiency across all load ranges.

· Includes IR Variable Gate Drive and Dynamic Phase Control for optimized performance.

· Supports 1-phase operation and active diode emulation mode.

· Employs Adaptive Transient Algorithm (ATA) to minimize output bulk capacitors.

· I2C/PMBus interface supports up to 16 VR loops.

· Configurable via IR Intuitive Power Designer (DPDC) GUI with on-chip NVM storage.

· Offers register diagnostics for rapid design cycles and platform differentiation.

FEATURES

· 5-phase dual output PWM Controller with flexible phase assignment.

· Supports Intel® VR12, AMD® 400kHz & 3.4MHz SVI, and Memory modes.

· Dual OCP support for enhanced AMD CPUs.

· SMB_Alert Pin for server applications.

· PMBus Address pin or Variable Gate Drive (IR3541/CHL8325A).

· 2nd Temperature Sense for VR12 Desktop (CHL8325B).

· Overclocking & Gaming Mode with Vmax setting.

· Switching frequency from 200kHz to 1.2MHz per phase.

· Programmable 1-phase or 2-phase for light loads and active diode emulation for very light loads.

· Per-Loop Fault Protection: OVP, UVP, OCP, OTP, CFP.

· I2C/SMBus/PMBus system interface for telemetry.

· Non-Volatile Memory (NVM) for custom configuration.

· Compatible with IR ATL and 3.3V Tri-state Drivers.

· +3.3V supply voltage; -20ºC to 85ºC ambient operation.

· Pb-Free, RoHS, 6x6 40-pin QFN, MSL2 package.

APPLICATIONS

· Intel® VR12 & AMD® SVI based systems.

· DDR Memory with Vtt tracking.

· Overclocked & Gaming platforms.