Infineon IR35221MTRPBF

The IR35221 is a dual loop, digital, multi-phase buck controller designed for CPU voltage regulation. It can support up to 8 phases and allows flexible phase assignment between the two loops. The IR35221 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 phases based upon load current. The IR35221 can be configured to enter 1- or 2-phase operation and active diode emulation mode automatically or by command. The IR35221 offers a digitally programmable load line thereby eliminating the need for any external load line setting component. The controller is designed to work with RDSON and DCR current sense PowIRstages and provides accurate input and output current reporting. IR’s unique Adaptive Transient Algorithm (ATA), based on proprietary non-linear control algorithms provides excellent transient response with reduced output capacitance. The controller also supports programmable cycle-by-cycle current limit per phase for superior dynamic current limiting. The device configuration can be easily defined using the IR PowIRCenter GUI and is stored in the on-chip memory. The IR35221 provides extensive OVP, UVP, OCP, OTP & CFP fault protection. The controller requires the fewest possible external components and supports a clean interface with the power stages resulting in a simplified Bill Of Materials (BOM).

• Low Quiescent Power PWM Controller with dual loop configurations
• Compliant to PMBus Rev 1.3 with AVSBus
• Flexible Phasing for both loops (8+0,7+1,...4+4)
• Switching frequency from 194 kHz to 2 MHz per phase
• IR Efficiency Shaping Features including Dynamic Phase Control and Automatic Power State Switching
• Programmable 1- or 2-phase operation for Light Loads & Active Diode Emulation for Very Light Loads
• Digitally programmable load line - no external components needed to set load line.
• 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, CFP, cycle-by-cycle current limit
• I2C/SMBus/PMBus system interface for reporting of Temperature, Voltage, Current & Power telemetry for both loops
• Multiple Time Programming (MTP) with up to 29 writes for the USER section
• Compatible with 3.3 V or tri-state drivers
• +3.3 V supply voltage; -40 ℃ to 85 ℃ ambient operation
• Pb-Free, RoHS, 5x5 mm 40-pin, 0.4 mm pitch QFN

• AVSBus based systems
• Server VR
• Memory VR