Infineon Technologies IR3622MPBF

Overview

IR3622MPBF from Infineon Technologies is a high-frequency, dual-phase synchronous buck controller supporting single-output current-sharing or dual-independent output configurations. It delivers ±1% reference accuracy, 200–600 kHz programmable switching frequency per phase, 180° out-of-phase operation, and integrated output tracking/sequencing for multi-rail power-up/down control in graphics cards and telecom point-of-load systems.

For engineers reviewing the IR3622MPBF datasheet, IR3622MPBF pinout, IR3622MPBF application, or IR3622MPBF equivalent, key selection criteria include its dual soft-start capability, MOSFET R_DS(on)-based hiccup overcurrent protection, ratiometric/simultaneous sequencing modes, and 32-lead MLPQ package with exposed thermal pad.

Technical Context

The IR3622MPBF implements two independent PWM controllers with shared oscillator and phase-shifted timing to reduce input/output ripple current. Its error amplifiers feature 3–4.5 m℧ transconductance and ±4 mV input offset, enabling precise regulation of two DC/DC outputs using external compensation networks on Comp1/Comp2 pins.

It supports flexible configuration via Seq and Track pins for ratiometric or simultaneous power sequencing, while OCSet1/OCSet2 pins set channel-specific overcurrent thresholds (16–24 µA), and Rt pin sets frequency via external resistor. Internal 7.2 V regulator (Vout3) powers auxiliary circuitry with 2 V dropout at 100 mA.

Key Specifications

Pinout & Package

The IR3622MPBF is housed in a 32-lead MLPQ (5 mm × 5 mm) package with exposed thermal pad connected to PGND for enhanced thermal performance (Θ_JA = 36°C/W on 4-layer board).

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 TPS51220ARGER, the IR3622MPBF uniquely combines programmable frequency, built-in tracking/sequencing logic, and R_DS(on) current sensing - making it optimal for custom industrial and telecom power architectures where flexibility and BOM reduction are critical.

Availability

IR3622MPBF is available at Aetrix Electronics and suitable for graphics card VRMs, telecom line cards, and server CPU voltage regulator modules requiring stable component supply, long-lifecycle support, and consistent thermal performance across -40°C to +125°C ambient.

Supply support for IR3622MPBF 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, and industrial control ICs, with global manufacturing and quality certification to ISO/TS 16949 and IECQ QC 080000.

The IR3622MPBF belongs to Infineon's IR36xx family of multi-phase DC/DC controllers, designed specifically for high-efficiency, high-density point-of-load power conversion in computing, communications, and embedded systems.

FAQ

What is the function of the Track and Seq pins on the IR3622MPBF?

The Track pin selects ratiometric or simultaneous sequencing behavior, while the Seq pin enables or disables sequencing functionality. When Seq is high, the device performs power-up/down sequencing; when low, outputs operate independently. Both pins must be tied to Vout3 if unused to prevent undefined operation.

Can the IR3622MPBF operate in single-output current-sharing mode without external current-sense resistors?

Yes - the IR3622MPBF uses MOSFET R_DS(on) sensing for current limiting and sharing, eliminating the need for external sense resistors. In current-shared mode, both phases share load equally using inductor DCR sensing, with hiccup-mode protection triggered when OCSet current exceeds 16–24 µA.

What is the purpose of the Vout3 pin and how should it be decoupled?

Vout3 is the output of the internal 7.2 V regulator, used to power gate drivers and internal logic. It must be decoupled with a 0.1 µF ceramic capacitor connected directly to PGnd, placed as close as possible to the pin to ensure stable driver operation and minimize noise coupling into sensitive analog blocks.

How does the IR3622MPBF handle pre-biased outputs during startup?

The IR3622MPBF supports pre-bias start-up by disabling low-side driver turn-on until the output voltage rises above the feedback threshold. This prevents reverse current flow into pre-charged output capacitors, avoiding potential damage to downstream components and ensuring controlled, monotonic voltage ramp-up.