International Test Instruments Corporation IR3622MTRPBF

Overview

IR3622MTRPBF 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, 200–600 kHz programmable switching frequency per phase, 180° out-of-phase operation, and MOSFET R_DS(on)-based current sensing. Used in graphics card VRMs and telecom point-of-load systems.

For engineers reviewing the IR3622MTRPBF datasheet, IR3622MTRPBF pinout, IR3622MTRPBF application, or IR3622MTRPBF equivalent, key selection criteria include dual-channel soft-start independence, ratiometric/simultaneous sequencing control via Track/Seq pins, hiccup-mode overcurrent protection, and external clock synchronization capability.

Technical Context

The IR3622MTRPBF integrates two independent PWM controllers with shared oscillator architecture enabling precise 180° phase offset-reducing input ripple and capacitor count. Each channel features dedicated error amplifiers (Comp1/Comp2), voltage sense inputs (VSEN1/VSEN2), and programmable overcurrent thresholds (OCSet1/OCSet2).

It supports three operational modes: dual independent outputs, current-shared single output (via Mode pin floating), and tracking/sequencing (enabled by Track and Seq pins). Internal 7.0 V regulator (VOUT3) powers auxiliary circuitry, while thermal shutdown at 140°C with 20°C hysteresis ensures robust operation under sustained load.

Key Specifications

Pinout & Package

The IR3622MTRPBF is housed in a thermally enhanced 32-lead MLPQ package with exposed thermal pad (Θ_JA = 36°C/W, Θ_JC = 1°C/W on 4-layer PCB). Pin numbering follows standard top-view layout with pin 1 at top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL6322IRZ and TPS546B24ARVFT, the IR3622MTRPBF offers analog simplicity with hardware-configurable sequencing and MOSFET R_DS(on) sensing-ideal for cost-sensitive, high-volume analog VRMs where digital overhead is unnecessary.

Availability

IR3622MTRPBF is available at Aetrix Electronics and suitable for graphics card VRMs, telecom point-of-load systems, and server CPU voltage regulators requiring stable component supply, long-lifecycle availability, and consistent parametric performance across production batches.

Supply support for IR3622MTRPBF 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 leader specializing in power management, automotive, and industrial control ICs, with global manufacturing and quality certification to ISO/TS 16949 and IECQ QC 080000.

The IR36xx family targets high-efficiency, high-density DC/DC conversion in computing and communications infrastructure-designed for analog-controlled, multi-phase buck regulation with minimal external components.

FAQ

What is the function of the Track and Seq pins on the IR3622MTRPBF?

The Track pin selects ratiometric or simultaneous power-up/down behavior between outputs; Seq pin enables or disables sequencing functionality. When Seq is pulled high, tracking is active; when low, outputs operate independently. Both pins must be tied to VOUT3 if unused-this prevents floating inputs that could cause erratic sequencing behavior.

How does the IR3622MTRPBF achieve current sharing in single-output mode?

In current-shared mode, the IR3622MTRPBF ties both channels' inductors to a common output node and configures SS2/SD2 as Mode pin (left floating). Phase interleaving and matched driver timing ensure balanced current distribution. No external current-balancing circuitry is needed-the controller internally synchronizes duty cycles and compensates for minor mismatches.

Can the IR3622MTRPBF operate with pre-biased outputs?

Yes-the IR3622MTRPBF supports pre-bias start-up via internal circuitry that monitors output voltage during soft-start and disables gate drive until VOUT exceeds 0.3×VREF. This prevents reverse current flow through synchronous rectifiers and avoids damaging downstream loads already powered by backup supplies.

What thermal management considerations apply to the IR3622MTRPBF's MLPQ package?

The 32-lead MLPQ package requires soldering the exposed thermal pad to a minimum 200 mm² copper pour with ≥4 thermal vias (0.3 mm diameter) to an internal ground plane. Θ_JA drops from 36°C/W to ≤22°C/W with this layout-critical for maintaining <125°C junction temperature at full load in compact VRM designs.