Infineon Technologies IR3556MTRPBF

Overview

IR3556MTRPBF from Infineon Technologies (formerly International Rectifier) is a 50A integrated PowIRstage® power stage combining synchronous buck gate driver, control MOSFET, synchronous MOSFET, Schottky diode, and on-die current/temperature sensing in a single 6 mm × 6 mm PQFN package. It supports 4.5–15 V input, 0.25–5.5 V output, 1 MHz switching, and delivers CPU/GPU core power in server-grade VRMs.

For engineers reviewing the IR3556MTRPBF datasheet, IR3556MTRPBF pinout, IR3556MTRPBF application, or IR3556MTRPBF equivalent, key selection criteria include its 5 mV/A temperature-compensated current sense accuracy, Body-Braking™ transient support via tri-state PWM, diode emulation mode for light-load efficiency, and phase fault detection capability.

Technical Context

The IR3556 implements a co-packaged synchronous buck power stage with integrated driver logic that directly controls high-side and low-side MOSFETs using internal timing calibration to minimize shoot-through risk. Its on-die current sensing uses MOSFET R_DS(on) tracking with 5 mV/A gain and analog temperature compensation, eliminating external DCR networks.

It features dual thermal monitoring: an 8 mV/°C analog temperature output and a digital thermal flag pulled up to 3.3 V, both derived from die temperature. Protection includes cycle-by-cycle OCP, preliminary OVP, OTP, and MOSFET phase fault detection-all implemented in hardware without controller dependency.

Key Specifications

Pinout & Package

IR3556MTRPBF is housed in a thermally enhanced 32-pin PQFN (6 mm × 6 mm, 0.9 mm height) with exposed thermal pad. Pin assignment follows Infineon's standardized PowIRstage® layout for optimal PCB routing and thermal management.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-current integrated power stage applications.

Compared with IR3556MTRPBF, IR35203MTRPBF trades current capacity and feature set for cost, while MP86957GQZ-10 prioritizes switching frequency and size over integrated protection and analog telemetry-making IR3556MTRPBF optimal for server-grade reliability and controller interoperability.

Availability

IR3556MTRPBF is available at Aetrix Electronics and suitable for server CPU VRMs, GPU power delivery, ASIC core supplies, and DDR5 VDDQ rails requiring stable component supply, long-lifecycle support, and validated thermal performance under sustained 50 A load.

Supply support for IR3556MTRPBF 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 is a global semiconductor leader specializing in power management, automotive, and industrial control ICs, with deep expertise in silicon and silicon carbide power devices.

The PowIRstage® product line delivers fully integrated, co-packaged power stages optimized for high-efficiency, high-density DC-DC conversion in datacenter and AI accelerator applications.

FAQ

What is the recommended PCB layout for thermal performance?

Use ≥6 thermal vias (0.3 mm diameter, 0.6 mm pitch) under the exposed thermal pad, connected to a solid internal ground plane. Route VIN and VOUT traces with ≥2 oz copper and minimum 3 mm width. Keep ISEN and TEMP traces short and away from noisy switching nodes to preserve analog accuracy.

Does IR3556MTRPBF require external bootstrap components?

No. The IR3556MTRPBF integrates all bootstrap circuitry internally, including charge pump and high-side gate driver supply regulation. No external capacitors or diodes are needed for bootstrap operation-only the standard VCC and VDRV supplies (4.5–7 V) must be provided.

How does the phase fault detection work?

Phase fault detection monitors voltage across each MOSFET leg using internal comparators. It flags open-circuit (e.g., bond wire lift) if V_DS remains high during expected conduction, or short-circuit if V_DS stays near 0 V during off-time. The TEMP pin asserts low within 100 ns of fault detection.

Can IR3556MTRPBF operate without a digital controller?

Yes-it functions as a standalone power stage with analog PWM input. However, full utilization of Body-Braking™, DEM, and current/temperature telemetry requires a compatible digital controller (e.g., IR3567B or ISL993xx series) that supports tri-state PWM and reads ISEN/TEMP analog outputs.