Infineon Technologies IR3888AMTRPBFAUMA1

Overview

IR3888AMTRPBFAUMA1 from Infineon is a fully integrated synchronous Buck regulator with integrated OptiMOS™ power FETs, delivering up to 20 A output current. It operates from 4.3 V to 17 V input (or 2.0 V–17 V with external VCC), features a precision 0.6 V ±0.5% reference, 800 kHz fixed switching frequency, and Fast Constant On-Time (COT) control enabling ceramic-capacitor-only designs without external compensation. Used in server point-of-load power rails.

For engineers reviewing the IR3888AMTRPBFAUMA1 datasheet, IR3888AMTRPBFAUMA1 pinout, IR3888AMTRPBFAUMA1 application, or IR3888AMTRPBFAUMA1 equivalent, key selection criteria include its integrated 20 A power stage, thermally compensated OCP, monotonic pre-bias start-up, PGood open-drain output, and PQFN 6 mm × 5 mm package with exposed thermal pad.

Technical Context

The IR3888A employs a Fast COT control architecture with adaptive on-time generation, eliminating loop compensation while maintaining stability across line/load/temperature. Its internal LDO powers the controller from VIN or an external VCC, enabling wide-input operation down to 2.0 V when biased externally.

Protection includes thermally compensated overcurrent detection via VSNS/PC1/PC2 sensing paths, programmable UVP/OVP thresholds referenced to FB, and hiccup-mode OTP with 20 ms delay. The PGood output asserts after soft-start completion and valid output regulation, with 1.2 V threshold and hysteresis.

Key Specifications

Pinout & Package

Packaged in a thermally enhanced 6 mm × 5 mm PQFN with 23 terminals and an exposed thermal pad (pin 23 = PVIN). Pin numbering follows standard top-view layout with pins 1–11 on top row (left-to-right), 12–22 on bottom row (right-to-left), and pin 23 centered at bottom edge.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2960GQ-Z and TPS53689T, the IR3888AMTRPBFAUMA1 offers superior integration (integrated bootstrap diode, LDO, and FETs), smaller footprint, and proven pre-bias capability-making it optimal for space-constrained, high-reliability server and storage PoL applications where analog simplicity and thermal robustness are prioritized.

Availability

IR3888AMTRPBFAUMA1 is available at Aetrix Electronics and suitable for server CPU core power, enterprise SSD power rails, telecom baseband power, and industrial FPGA I/O bank supply requiring stable component supply and long-term industrial qualification.

Supply support for IR3888AMTRPBFAUMA1 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 leadership in silicon and GaN power devices.

The IR3888A belongs to Infineon's OptiMOS™ IPOL (Integrated POL) product line, designed specifically for high-current, low-voltage point-of-load conversion in datacenter and networking infrastructure where integration, thermal performance, and reliability are critical.

FAQ

What input voltage configurations does the IR3888AMTRPBFAUMA1 support?

The device supports two primary input configurations: a single 4.3 V–17 V supply connected to both PVIN and VIN/VCC, or a wide 2.0 V–17 V range using an external bias applied to VCC/LDO while shorting VIN to VCC/LDO. The internal LDO enables operation from the main input or external rail, allowing flexibility in intermediate bus architectures.

How is output voltage programmed, and what is the role of the VSNS pin?

Output voltage is set via a resistor divider from VOUT to FB, referenced to the 0.6 V internal基准. The VSNS pin provides a second, independent voltage sensing path used exclusively for overvoltage protection and PGood assertion-ensuring accurate fault detection even if the FB divider fails or drifts, thereby enhancing system safety beyond basic regulation.

Does the IR3888AMTRPBFAUMA1 require external compensation components?

No. The Fast Constant On-Time (COT) control architecture is inherently stable with ceramic output capacitors and requires no external compensation network. This simplifies design, reduces component count, and improves transient response-verified across full load, line, and temperature ranges in the official datasheet efficiency and waveform plots.

What thermal management features are implemented in the IR3888AMTRPBFAUMA1?

The device integrates thermally compensated overcurrent protection, where the current-limit threshold scales with junction temperature to maintain consistent fault coverage. It also includes thermal shutdown with hysteresis and a dedicated thermal pad (pin 23 = PVIN) that must be soldered to a large PCB copper area with ≥4 thermal vias to achieve the specified θ_JA of 2.5 °C/W.