Infineon Technologies IR3622AMPBF

Overview

IR3622AMPBF 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 DCR-based current sharing. Used in graphics card VRMs and telecom point-of-load systems requiring tight rail coordination.

For engineers reviewing the IR3622AMPBF datasheet, IR3622AMPBF pinout, IR3622AMPBF application, or IR3622AMPBF equivalent, key selection criteria include dual-phase 180° out-of-phase operation, independent soft-start/PGOOD outputs, ratiometric or simultaneous sequencing, hiccup-mode overcurrent protection using MOSFET R_DS(on), and thermal shutdown at 140°C.

Technical Context

The IR3622AMPBF integrates two independent PWM controllers with synchronized 180° phase shift to reduce input/output ripple and capacitor count. Each channel features dedicated error amplifiers (Comp1/Comp2), voltage sense inputs (VSEN1/VSEN2), and programmable overvoltage protection (1.15×V_REF trip).

It supports flexible configuration: dual independent outputs or current-shared single output via SS2/SD2 pin strapping. Sequencing mode (simultaneous/ratiometric) is selected by the Track pin, while Seq enables tracking control. Internal 7.2 V regulator (VOUT3) powers auxiliary circuitry with 2 V dropout at 100 mA.

Key Specifications

Pinout & Package

IR3622AMPBF uses a 32-lead MLPQ (Micro Leadframe Package Quad) with exposed thermal pad. Θ_JA = 36°C/W and Θ_JC = 1°C/W for 4-layer PCB designs; exposed pad must be connected to ground plane via multiple vias.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL6269CRZ-T and TPS546B24RVFR, the IR3622AMPBF offers unique analog configurability-external frequency tuning, hardware-selectable sequencing modes, and DCR-based current sharing-making it optimal for cost-sensitive, high-reliability analog VRMs where digital overhead is unnecessary.

Availability

IR3622AMPBF is available at Aetrix Electronics and suitable for graphics card VRMs, telecom point-of-load systems, and industrial DC/DC converter modules requiring stable component supply, long lifecycle support, and consistent parametric performance across temperature.

Supply support for IR3622AMPBF 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 IR3622A belongs to Infineon's high-performance analog power controller product line, designed specifically for multi-phase, multi-rail DC/DC conversion in computing, telecom, and embedded systems demanding precision regulation and robust fault handling.

FAQ

What is the maximum supported input voltage for the high-side gate drivers (HDrv1/HDrv2)?

HDrv1 and HDrv2 tolerate up to 30 V referenced to PGND, with a –2 V rating for pulses ≤100 ns. This allows direct connection to 12 V or 24 V bus voltages when used with appropriate level-shifting bootstrap circuits. The absolute maximum rating ensures robustness during transient events like load dump or inductive kickback.

How does the IR3622AMPBF implement current sharing between phases?

Current sharing is achieved by sensing the voltage drop across the low-side MOSFET's R_DS(on) using OCSet1/OCSet2 pins. The controller adjusts duty cycles dynamically to equalize average conduction losses, eliminating the need for discrete current-sense resistors. This method reduces power loss and BOM cost while maintaining ±5% current balance across phases under steady-state conditions.

Can the IR3622AMPBF operate with pre-biased output capacitors?

Yes-the IR3622AMPBF supports pre-bias start-up. Its control architecture prevents reverse current flow during startup by holding the low-side FET off until the error amplifier output rises above the ramp voltage. This feature is essential for hot-plug applications such as modular servers or PCIe add-in cards where downstream rails may already be energized.

What is the function of the Seq pin (Pin 15), and how should it be terminated if unused?

The Seq pin enables tracking mode activation: pulled high (to VOUT3) it engages ratiometric sequencing; grounded it disables tracking. If unused, it must be tied to VOUT3 to prevent floating states that could cause erratic sequencing behavior. Leaving Seq unconnected risks undefined power-up order between Vo1 and Vo2 due to internal leakage paths.