Infineon Technologies IR3846AMTRPBFAUMA1

Overview

IR3846AMTRPBFAUMA1 from Infineon is a fully integrated 40 A synchronous buck regulator with OptiMOS™ power stages, Fast Constant On-Time (COT) control, 600 kHz switching frequency, 0.6 V ±0.5% reference voltage, and forced continuous conduction mode (FCCM). It operates from 4.3–17 V input (or 2–17 V with external VCC), supports monotonic 1 ms soft-start, and delivers point-of-load power in server, storage, and telecom systems.

For engineers reviewing the IR3846AMTRPBFAUMA1 datasheet, IR3846AMTRPBFAUMA1 pinout, IR3846AMTRPBFAUMA1 application, or IR3846AMTRPBFAUMA1 equivalent, key selection criteria include its thermally compensated dual OCP settings, pre-bias start-up capability, integrated bootstrap diode, VCC/LDO bias flexibility, and PQFN 5 mm × 7 mm package thermal performance.

Technical Context

The IR3846A implements a Fast COT control architecture with adaptive on-time generation, enabling stable regulation with ceramic output capacitors and no external compensation. Its internal LDO powers the controller from VIN or an external VCC supply, extending input range down to 2 V.

Protection logic includes thermally compensated overcurrent detection with two user-selectable thresholds via ILIM pin, monotonic soft-start with 1 ms ramp, and independent UVP/OVP/OTP with hiccup-mode fault recovery. The PGood open-drain output asserts after output regulation and voltage monitoring validation.

Key Specifications

Pinout & Package

IR3846AMTRPBFAUMA1 is housed in a thermally enhanced 5 mm × 7 mm PQFN package with exposed thermal pad (PGND-connected) and 26-pin layout optimized for high-current POL layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2960GQZ and TPS53689TSSR, the IR3846AMTRPBFAUMA1 uniquely combines integrated bootstrap diode, monotonic startup, and dual OCP selection in a 5 mm × 7 mm footprint - optimizing for reliability-critical, space-constrained POL designs without external driver overhead.

Availability

IR3846AMTRPBFAUMA1 is available at Aetrix Electronics and suitable for server CPU core VR, enterprise SSD power rail, telecom baseband ASIC supply, and datacenter network switch PHY rail applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for IR3846AMTRPBFAUMA1 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 MCUs, and security ICs, with global manufacturing and qualification aligned to industrial and automotive standards.

The IR3846A belongs to Infineon's OptiMOS™ IPOL (Integrated POL) product line, designed specifically for high-current, low-voltage point-of-load regulation in datacenter, telecom, and storage infrastructure where integration, thermal performance, and fast transient response are critical.

FAQ

What input voltage range does the IR3846AMTRPBFAUMA1 support with and without external VCC?

The IR3846AMTRPBFAUMA1 operates from 4.3 V to 17 V using a single PVIN supply. When an external bias is applied to the VCC/LDO pin, the input range extends to 2 V to 17 V - enabling compatibility with intermediate bus voltages like 3.3 V or 5 V while maintaining full 40 A capability.

How is output voltage programmed, and what is the reference accuracy?

Output voltage is set via a resistor divider from VOUT to FB and RSo−, with a precision 0.6 V ±0.5% internal reference. This yields ±3 mV absolute accuracy, supporting common outputs like 0.8 V (1:0.333 divider), 1.0 V (1:0.667), or 1.8 V (1:2) with tight regulation across line, load, and temperature.

Does the IR3846AMTRPBFAUMA1 support remote sensing, and how is it implemented?

Yes - it supports pseudo-remote sensing using RS+ and RS− pins. RS+ connects to the load's VOUT node, RS− to load ground, while RSo+ and RSo− form the local feedback reference path. This compensates for IR drop in PCB traces without requiring four-terminal Kelvin connections.

What thermal protection mechanisms are built into the IR3846AMTRPBFAUMA1?

The device integrates thermal shutdown (OTP) with automatic hiccup-mode recovery, plus thermally compensated overcurrent protection that scales the current limit with junction temperature. These features prevent latch-up during sustained overload or elevated ambient conditions while preserving system uptime through controlled fault recovery.