Microchip Technology MIC39101-2.5BM

Overview

MIC39101-2.5BM from Microchip Technology is a 1A low-dropout linear regulator (LDO) with fixed 2.5V output, 350mV dropout at 1A, and ±2% output voltage accuracy. It features thermal shutdown, current limiting, and reverse-battery protection, and is used in battery-powered instrumentation and portable medical devices requiring stable low-noise supply.

For engineers reviewing the MIC39101-2.5BM datasheet, MIC39101-2.5BM pinout, MIC39101-2.5BM application, or MIC39101-2.5BM equivalent, key selection criteria include dropout voltage at full load, output accuracy over temperature, quiescent current in active mode, and thermal performance under sustained 1A output.

Technical Context

The MIC39101-2.5BM employs a PNP pass transistor architecture enabling ultra-low dropout operation without requiring external compensation. Its internal bandgap reference and error amplifier deliver tight regulation across -40°C to +125°C junction temperature range.

It integrates foldback current limiting that reduces output current during short-circuit events, and thermal shutdown activates at 160°C with automatic recovery upon cooling. The device operates with input voltages from 2.7V to 16V and maintains stability with 10µF minimum ceramic output capacitance.

Key Specifications

Pinout & Package

Package: SOT-223-3 (TO-261AA), thermally enhanced plastic surface-mount package with exposed thermal pad connected to GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A2025PDQNR and AP2112K-2.5TRG1, the MIC39101-2.5BM uniquely delivers 1A capability with integrated reverse-battery protection and 350mV dropout-making it optimal for ruggedized portable equipment where input polarity risk and full-load efficiency coexist.

Availability

MIC39101-2.5BM is available at Aetrix Electronics and suitable for portable medical devices, industrial handheld testers, and battery-powered data loggers requiring stable component supply with long-term lifecycle assurance.

Supply support for MIC39101-2.5BM 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

Microchip Technology is a U.S.-based semiconductor company specializing in microcontrollers, analog, and mixed-signal ICs for industrial, automotive, and consumer applications.

The MIC39101 series is designed for high-reliability, low-noise linear regulation in space-constrained portable systems where battery longevity and fault tolerance are critical.

FAQ

What is the maximum input voltage rating for the MIC39101-2.5BM?

The MIC39101-2.5BM supports an absolute maximum input voltage of 16V. Operation above this level risks permanent damage. For reliable long-term use, Microchip recommends limiting input to ≤15V with appropriate derating margin, especially at elevated ambient temperatures where thermal stress increases.

Does the MIC39101-2.5BM require an external capacitor on the output pin?

Yes, the MIC39101-2.5BM requires a minimum 10µF ceramic output capacitor with low ESR for stability. Microchip specifies X5R or X7R dielectrics; tantalum or aluminum electrolytics are not recommended due to higher ESR and potential instability. The capacitor must be placed within 5mm of the OUT and GND pins.

Can the MIC39101-2.5BM operate with a 3.0V input supply?

Yes, the MIC39101-2.5BM can operate with a 3.0V input because its dropout voltage is 350mV at 1A. At 3.0V input, it sustains regulated 2.5V output up to ~900mA before dropout occurs. Below 1A load, headroom improves-e.g., at 500mA, dropout drops to ~200mV, allowing stable operation down to 2.7V input.

Is thermal pad connection mandatory for the MIC39101-2.5BM in SOT-223 package?

Yes, the exposed thermal pad on the MIC39101-2.5BM's SOT-223 package must be soldered to a dedicated GND copper pour. This connection is essential for achieving rated 1A output current and preventing thermal shutdown. Without proper thermal pad soldering, safe continuous current drops below 400mA at 25°C ambient.

What protection features are built into the MIC39101-2.5BM?

The MIC39101-2.5BM integrates thermal shutdown, foldback current limiting, and reverse-battery protection. Thermal shutdown activates at 160°C junction temperature with automatic recovery. Foldback current limiting reduces output current during shorts to limit power dissipation. Reverse-battery protection blocks conduction if input polarity is inverted-no external components required.