Infineon Technologies IR3822MTR1PBF

Overview

IR3822MTR1PBF from Infineon Technologies is a highly integrated synchronous buck regulator with internal high- and low-side MOSFETs, delivering continuous 4A output current across 2.5V–21V input and 0.6V–12V adjustable output. It operates at a fixed 600kHz switching frequency, features programmable over-current protection via OCSet pin, precision 0.6V reference (±1.5% over –40°C to +105°C), and supports pre-bias start-up for DDR memory power rails.

For engineers reviewing the IR3822MTR1PBF datasheet, IR3822MTR1PBF pinout, IR3822MTR1PBF application, or IR3822MTR1PBF equivalent, key selection criteria include its thermally enhanced 5mm×6mm QFN-15 package, dual UVLO thresholds (VCC: 4.0–4.4V, VC: 3.1–3.5V), hiccup-mode current limiting, and open-drain PGood with externally programmable trip point via Vsns.

Technical Context

The IR3822MTR1PBF implements voltage-mode PWM control with a fixed-frequency 600kHz oscillator and internal sawtooth ramp generator. Its error amplifier compares FB voltage against a 0.6V reference, driving trailing-edge PWM pulses to gate drivers without external timing components.

Current sensing uses R_DS(on) of the internal low-side MOSFET (18–23mΩ typ.), eliminating external sense resistors. Protection includes non-latched thermal shutdown at 140°C (20°C hysteresis), programmable soft-start via SS capacitor, and independent VCC/VC under-voltage lockout with distinct rising/falling thresholds.

Key Specifications

Pinout & Package

IR3822MTR1PBF is housed in a thermally enhanced 5mm × 6mm Power QFN-15 package with exposed thermal pad (PGnd-connected) and 15 terminals arranged in a 3×5 grid. Pin 1 (Vsns) is top-left; pin 15 (AGnd) is bottom-right. AGnd pins (4, 5, 15) must be shorted on PCB for stable reference grounding.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck regulator applications.

Compared with MP2315DJ-LF-Z and TPS54332DR, the IR3822MTR1PBF uniquely combines 4A integrated power stage, pre-bias start-up, and dual UVLO in a 5mm×6mm QFN - making it optimal for space-constrained, high-reliability DDR and GPU core rails where startup robustness and thermal efficiency are critical.

Availability

IR3822MTR1PBF is available at Aetrix Electronics and suitable for server point-of-load converters, DDR memory power supplies, and graphics card core regulators requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.

Supply support for IR3822MTR1PBF 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 ICs, with leadership in high-efficiency power conversion and silicon carbide technologies.

The IR3822 belongs to Infineon's SupIRBuck™ family - designed specifically for high-density, high-reliability point-of-load applications in computing infrastructure, where integration, thermal performance, and startup robustness are essential.

FAQ

What is the minimum output voltage supported by the IR3822MTR1PBF?

The IR3822MTR1PBF supports a minimum output voltage of 0.6V, set by its internal precision reference. This value is guaranteed over –40°C to +105°C with ±1.5% accuracy, enabling direct regulation for modern DDR memory and low-voltage ASIC cores without external reference trimming.

How does the IR3822MTR1PBF implement current limiting without a sense resistor?

The device senses current through the R_DS(on) of its internal low-side MOSFET (18–23mΩ), using the voltage drop across it as a proportional current signal. An external resistor from OCSet to SW sets the trip threshold, eliminating the need for a discrete sense resistor and associated power loss.

Can the IR3822MTR1PBF operate with an input voltage below 4.5V?

Yes - although the recommended operating input range starts at 4.5V, the absolute maximum rating allows VIN down to 2.5V. Operation below 4.5V is functional but may reduce output current capability due to reduced gate drive margin and increased conduction losses in the internal MOSFETs.

What is the purpose of separating AGnd and PGnd pins?

AGnd (pins 4, 5, 15) serves as the quiet reference ground for analog circuitry (error amplifier, reference, comparators), while PGnd (pin 10) handles high-current return paths for MOSFET drivers and SW node. Separating them minimizes noise coupling and improves regulation accuracy and stability under dynamic load conditions.