Infineon Technologies IR35203MTRPBF

Overview

IR35203MTRPBF from Infineon Technologies (formerly International Rectifier) is a dual-loop, 6+1 phase digital multi-phase buck controller for CPU and memory voltage regulation, compliant with Intel® VR12 Rev 1.7, VR12.5 Rev 1.5, and IMVP8 Rev 1.2 specifications. It delivers programmable switching frequency (194 kHz–2 MHz), IR Adaptive Transient Algorithm (ATA), Dynamic Phase Control, and full PMBus/I²C telemetry for voltage, current, temperature, and power across both outputs.

For engineers reviewing the IR35203MTRPBF datasheet, IR35203MTRPBF pinout, IR35203MTRPBF application, or IR35203MTRPBF equivalent, key selection considerations include dual-loop PS1/PS2 configuration support, 48-pin QFN package compatibility with 3.3 V tri-state drivers, light-load active diode emulation, and MTP-based non-volatile configuration storage via IR PowIRCenter GUI.

Technical Context

The IR35203 implements two independent digital control loops-one for CPU core (6-phase) and one for memory or GPU (1-phase)-each supporting Intel SVID command sets and adaptive load-line programming via RCSP/RCSM networks. Its proprietary ATA uses non-linear digital PWM to reduce bulk capacitance requirements without compromising transient response.

It integrates dual current-sense architectures (R_DS(on) or DCR), thermistor- or PowIRstage-based temperature reporting on both loops, and comprehensive fault protection including OVP/UVP/OCP/OTP/CAT_FLT. Configuration is stored in on-chip MTP memory, eliminating external EEPROM and enabling field reprogramming via PMBus.

Key Specifications

Pinout & Package

IR35203MTRPBF is housed in a 6 mm × 6 mm, 48-pin QFN package with 0.4 mm pitch and exposed thermal pad. The package supports high-density PCB layouts and efficient thermal dissipation (θ_JC = 3°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multi-phase digital VR controller applications.

Compared with ISL6381IRZ and MP2940AGQSE, IR35203MTRPBF uniquely supports dual independent loops with full VR12.5/IMVP8 compliance, hardware-multiplexed CAT_FLT functionality, and unified MTP configuration-making it the only option for legacy server platforms requiring simultaneous CPU + memory VR with Intel specification adherence.

Availability

IR35203MTRPBF is available at Aetrix Electronics and suitable for server CPU voltage regulators, high-end desktop overclocking motherboards, GPU memory VR systems, and Intel IMVP8-compliant graphics cards requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for IR35203MTRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Infineon Technologies acquired International Rectifier in 2015 and continues its legacy of high-performance power management ICs for computing, industrial, and automotive markets.

The IR35203 belongs to Infineon's PowIRcenter™ digital multi-phase controller product line, designed specifically for Intel-compliant CPU and memory voltage regulation in servers, workstations, and enthusiast desktop platforms.

FAQ

What is the maximum number of phases supported by IR35203MTRPBF?

The IR35203MTRPBF supports up to six phases on Loop 1 (CPU core) and one dedicated phase on Loop 2 (memory/GPU), totaling a 6+1 phase configuration. All six PWMx outputs and PWM1_L2 are physically present and electrically functional. Phase count is configured via MTP registers-not hardware-strapped-and auto-detection eliminates manual setup for partial phase usage.

Does IR35203MTRPBF require an external EEPROM for configuration storage?

No. IR35203MTRPBF integrates Multiple Time Programmable (MTP) non-volatile memory with an on-chip charge pump, enabling full configuration storage-including PID coefficients, fault thresholds, and SVID settings-without external EEPROM. Configuration is programmed once via IR PowIRCenter GUI over PMBus and retained across power cycles.

Can IR35203MTRPBF operate with both R_DS(on) and DCR current sensing?

Yes. The IR35203MTRPBF supports both R_DS(on) sensing (using ISENx/IRTNx differential inputs) and DCR sensing (via RCSPx/RCSMx networks). Each loop has independent current-sense architecture selection, allowing mixed-mode operation-for example, R_DS(on) on Loop 1 and DCR on Loop 2-without external circuit changes.

What is the function of the EN_L2/CAT_FLT pin?

The EN_L2/CAT_FLT pin is a dual-function terminal: configured as an enable input for Loop 2 during normal operation, or as a CMOS catastrophic fault output (driven to VCC) upon OVP, NVM CRC error, or TSEN fault. This multiplexing reduces pin count while enabling flexible system-level fault handling-either to disable memory VR or signal critical failure to baseboard management controllers.