Infineon Technologies IR3622AMTRPBF

Overview

IR3622AMTRPBF from Infineon Technologies is a high-frequency, dual-phase synchronous step-down controller supporting single or dual output configurations with output voltage tracking and power sequencing. It delivers ±1% reference accuracy, programmable 200–600 kHz switching frequency per phase, and current sharing via DCR sensing-enabling high-current point-of-load regulation in graphics cards and telecom voltage rails.

For engineers reviewing the IR3622AMTRPBF datasheet, IR3622AMTRPBF pinout, IR3622AMTRPBF application, or IR3622AMTRPBF equivalent, key selection criteria include dual independent soft-starts, hiccup-mode overcurrent protection using MOSFET R_DS(on), ratiometric/simultaneous sequencing control, and thermal shutdown at 140°C with 20°C hysteresis.

Technical Context

The IR3622AMTRPBF implements two interleaved 180° out-of-phase PWM controllers with independent error amplifiers (Comp1/Comp2), dedicated VSEN pins for OVP/PGOOD per channel, and a shared oscillator adjustable via external Rt resistor or external Sync clock up to 1200 kHz. Each phase supports programmable OCSET threshold (16–24 µA) and dual-mode soft-start (SS1/SD1, SS2/SD2).

It integrates an internal 7.2 V regulator (VOUT3), precision enable input with 1.24 V threshold and 0.22 V hysteresis, under-voltage lockout (VCC_UVLO = 4.1 V typ), and tracking/sequencing logic controlled by Track and Seq pins-allowing simultaneous or ratiometric power-up/down of two output rails.

Key Specifications

Pinout & Package

IR3622AMTRPBF uses a 32-lead MLPQ (Micro Leadframe Package Quad) with exposed thermal pad. The package provides Θ_JA = 36°C/W and Θ_JC = 1°C/W on a 4-layer PCB with vias to internal ground plane.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-phase synchronous buck controller applications.

Compared with ISL6322IRZ-T and TPS546D24ARVFT, the IR3622AMTRPBF offers analog-configurable tracking/sequencing without digital overhead, making it optimal for cost-sensitive, fixed-function embedded power systems where simplicity and thermal robustness are prioritized over telemetry.

Availability

IR3622AMTRPBF is available at Aetrix Electronics and suitable for graphics card VRMs, telecom point-of-load regulators, and server CPU voltage regulators requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for IR3622AMTRPBF 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 German semiconductor manufacturer specializing in power management, automotive ICs, and industrial control solutions, with global manufacturing and quality certification to ISO/TS 16949 and ISO 14001.

The IR3622A belongs to Infineon's high-density DC/DC controller product line, designed specifically for multi-phase, multi-rail power conversion in space-constrained computing and communications infrastructure.

FAQ

What is the function of the Track pin (Pin 32) on the IR3622AMTRPBF?

The Track pin selects between simultaneous and ratiometric power-up/down sequencing modes. When pulled low, it enables simultaneous tracking; when pulled high, it activates ratiometric sequencing. If unused, it must be tied to VOUT3 (Pin 31) to default to simultaneous mode. This pin directly controls internal comparator thresholds that govern the relative ramp rates of the two output channels.

Can the IR3622AMTRPBF operate with only one output active?

Yes-the IR3622AMTRPBF supports both dual-output and single-output current-sharing configurations. To use single-output mode, connect SS2/SD2 (Pin 5) to VOUT3 and tie OCSet2 (Pin 6) to GND. The controller then operates both phases in parallel, sharing load current via DCR sensing on the shared inductor, delivering up to 80 A with improved thermal distribution.

How does the hiccup-mode overcurrent protection work on this controller?

Hiccup-mode OCP triggers when sensed current exceeds the OCSET threshold (set by external resistor on OCSet1/OCSet2 pins). Upon fault, the controller disables switching, waits a fixed interval (~10 ms), then attempts restart. If the fault persists, it repeats the cycle. This limits average power dissipation during sustained overload, protecting MOSFETs and PCB traces without requiring external latch circuitry.

Is the internal 7.2 V regulator (VOUT3) capable of driving external gate drivers?

Yes-VOUT3 delivers 7.2 V ±0.5 V at up to 110 mA, sufficient to power high-side gate drivers for external N-channel MOSFETs in bootstrap configurations. A 0.1 µF ceramic capacitor must be placed between VOUT3 and PGND. The regulator remains active even during UVLO conditions on VCC, ensuring gate drive integrity during brown-out events.