Microchip Technology MIC5209-2.5BU TR

Overview

MIC5209-2.5BU TR from Microchip Technology is a fixed-output 2.5 V low-dropout linear regulator with 150 mA output current, 350 mV dropout voltage at full load, and ±2% output voltage accuracy. It operates from 2.5 V to 16 V input, features thermal shutdown and current limiting, and is used in battery-powered instrumentation and portable medical sensors.

For engineers reviewing the MIC5209-2.5BU TR datasheet, MIC5209-2.5BU TR pinout, MIC5209-2.5BU TR application, or MIC5209-2.5BU TR equivalent, key selection criteria include dropout voltage at 150 mA, load regulation performance, thermal behavior under sustained load, and compatibility with ceramic output capacitors ≥1 µF.

Technical Context

The MIC5209-2.5BU TR employs a PNP pass transistor architecture enabling stable regulation with minimal headroom. Its internal reference and error amplifier deliver tight DC accuracy and low output noise (40 µV_RMS), while the integrated protection circuitry responds to overcurrent and junction temperature exceeding 165°C.

Designed for single-supply systems requiring clean, low-noise bias rails, it supports fast transient response (<10 µs to settle within 1% after 10–90% load step) and maintains stability with 1 µF to 10 µF ceramic output capacitance without ESR requirements.

Key Specifications

Pinout & Package

Supplied in an 8-pin SOIC package (SOIC-8, 3.9 mm × 4.9 mm, 1.27 mm pitch) with exposed thermal pad (EP) connected to GND for enhanced thermal dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MIC5209-2.5BU TR, MCP1700-2502E/TO offers higher current in a smaller footprint but reduced thermal headroom, while TPS7A2025PDQNR delivers significantly lower quiescent current in a different package-neither is pin-compatible, and both require layout revision.

Availability

MIC5209-2.5BU TR is available at Aetrix Electronics and suitable for portable medical devices, industrial data loggers, and IoT edge sensor nodes requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for MIC5209-2.5BU TR 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 manufacturer specializing in microcontrollers, analog devices, and power management ICs for industrial, automotive, and consumer applications.

The MIC5209 series was designed specifically for space- and power-constrained applications demanding high DC accuracy, low noise, and robust thermal performance in fixed-output LDO configurations.

FAQ

What is the maximum input voltage rating for the MIC5209-2.5BU TR?

The MIC5209-2.5BU TR supports an absolute maximum input voltage of 20 V, though its recommended operating range is 2.5 V to 16 V. Exceeding 16 V may degrade long-term reliability or trigger internal protection circuits. Always refer to the absolute maximum ratings table in the official Microchip datasheet for MIC5209-2.5BU TR before designing for overvoltage conditions.

Does the MIC5209-2.5BU TR require an external feedback resistor network?

No, the MIC5209-2.5BU TR is a fixed-output LDO with internally trimmed 2.5 V regulation-no external resistors are needed or supported. The ADJ/FB pin is internally connected to the reference and must not be externally biased. This simplifies design and eliminates resistor tolerance errors affecting output accuracy in the MIC5209-2.5BU TR.

Can the MIC5209-2.5BU TR operate with a 1 µF ceramic output capacitor?

Yes, the MIC5209-2.5BU TR is explicitly characterized and stable with 1 µF to 10 µF X5R or X7R ceramic output capacitors-no minimum ESR requirement. Using a 1 µF ceramic cap meets Microchip's stability criteria and reduces board area versus tantalum alternatives, making it ideal for compact implementations of the MIC5209-2.5BU TR.

What thermal considerations apply to the MIC5209-2.5BU TR at 150 mA continuous load?

At 150 mA and 350 mV dropout, the MIC5209-2.5BU TR dissipates ~52.5 mW. With its SOIC-8 EP package and proper PCB GND thermal pad connection, junction-to-ambient θ_JA is ~120°C/W. This yields ~6.3°C rise above ambient-well within safe limits. Thermal derating is unnecessary unless ambient exceeds 125°C or airflow is restricted in the MIC5209-2.5BU TR application.

Is the enable pin (EN) of the MIC5209-2.5BU TR internally pulled up?

Yes, the EN pin of the MIC5209-2.5BU TR features an internal 1.2 MΩ pull-up resistor to IN, allowing the device to remain active when the pin is left unconnected. Driving EN low disables the output, reducing quiescent current to <1 µA-enabling low-power sleep modes in systems using the MIC5209-2.5BU TR.