Microchip Technology MIC5239-2.5YMM-TR

Overview

MIC5239-2.5YMM-TR from Microchip Technology is a fixed 2.5V, low-quiescent-current µCap LDO regulator in an 8-lead MSOP package, delivering up to 500 mA output with 350 mV dropout at full load and ±1.0% initial output accuracy. It features logic-compatible enable, open-collector FLAG output for undervoltage detection, reverse-battery protection, and thermal shutdown - designed for keep-alive power in high-voltage battery systems such as automotive electronics and portable PCs.

For engineers reviewing the MIC5239-2.5YMM-TR datasheet, MIC5239-2.5YMM-TR pinout, MIC5239-2.5YMM-TR application, or MIC5239-2.5YMM-TR equivalent, key selection criteria include its 23 µA quiescent current at light load, stable operation with ceramic or tantalum output capacitors ≥3.3 µF, and compatibility with input voltages from 2.3V to 30V in thermally enhanced MSOP-8 packaging.

Technical Context

The MIC5239-2.5YMM-TR employs a µCap architecture enabling stability with low-ESR ceramic or tantalum output capacitors (minimum 3.3 µF), eliminating need for electrolytic types. Its internal error amplifier and PMOS pass device support ultra-low dropout (350 mV @ 500 mA) and tight line/load regulation (0.5% line, 30 mV load).

It integrates dual protection logic: reverse-battery protection prevents damage during incorrect battery insertion, while the open-collector FLAG pin asserts low when VOUT drops below 94% of nominal due to insufficient VIN, overcurrent, or thermal fault - requiring external pull-up for system monitoring.

Key Specifications

Pinout & Package

Package: 8-Lead MSOP (MM), thermally enhanced with pins 5–8 internally connected to GND via leadframe for improved heat dissipation and lower θJA.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1703-2502E/MB and NCP1117ST2.5T3G, the MIC5239-2.5YMM-TR uniquely balances 500 mA capability, 23 µA quiescent current, integrated FLAG reporting, and reverse-battery protection - making it irreplaceable in automotive keep-alive and high-reliability USB power applications where all four attributes are mandatory.

Availability

MIC5239-2.5YMM-TR is available at Aetrix Electronics and suitable for automotive electronics, notebook PC keep-alive rails, and USB power supply designs requiring stable component supply, long-lifecycle availability, and guaranteed traceable sourcing.

Supply support for MIC5239-2.5YMM-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 company specializing in microcontrollers, analog devices, and power management ICs, with global manufacturing and quality certifications including ISO 9001 and AEC-Q200.

The MIC5239 product line delivers ultra-low-IQ, high-input-voltage LDO regulators optimized for battery-backed systems, automotive modules, and portable electronics demanding extended runtime and robust fault protection.

FAQ

What is the maximum input voltage rating for the MIC5239-2.5YMM-TR?

The MIC5239-2.5YMM-TR has an absolute maximum input voltage rating of +32V and an operating input voltage range of +2.3V to +30V. This allows direct connection to 24V industrial buses and automotive systems with load-dump transients, provided external clamping or filtering is used to stay within the 32V absolute limit. The MIC5239-2.5YMM-TR maintains regulation and protection functionality across this full range.

Does the MIC5239-2.5YMM-TR require an external output capacitor, and what type is recommended?

Yes, the MIC5239-2.5YMM-TR requires a minimum 3.3 µF output capacitor for stability. It is specifically designed as a µCap LDO and is stable with either ceramic or tantalum capacitors - no electrolytic capacitor is needed. Ceramic capacitors are preferred for low ESR, small size, and reliability; typical values used are 4.7 µF to 10 µF X7R dielectric in 0805 or 1206 packages.

How does the FLAG pin on the MIC5239-2.5YMM-TR function, and what external components are needed?

FLAG is an open-collector output that pulls low when VOUT drops below 94% of 2.5V (i.e., <2.35V), indicating undervoltage due to overload, low input, or thermal fault. An external pull-up resistor (200 kΩ to 1 MΩ) to VIN or another supply is required. The MIC5239-2.5YMM-TR FLAG output sinks up to 200 µA at ≤150 mV low-level voltage, enabling direct interfacing with microcontroller interrupt or reset inputs.

What thermal considerations apply to the MIC5239-2.5YMM-TR in its MSOP-8 package?

The MIC5239-2.5YMM-TR has a θJA of 80°C/W in the MSOP-8 package, requiring a minimum 110 mm² copper pour for safe operation at 632 mW dissipation at 50°C ambient. Pins 5–8 are internally tied to GND and must be soldered to a solid ground plane to achieve rated thermal performance. Without adequate copper area, junction temperature may exceed +125°C, triggering thermal shutdown and reducing reliability.

Is the MIC5239-2.5YMM-TR pin-compatible with other MIC5239 variants such as MIC5239-2.5YM or MIC5239-2.5YS?

No, the MIC5239-2.5YMM-TR is not pin-compatible with SOIC-8 (YM) or SOT-223 (YS) variants. While all share identical pin functions (EN, FLG, IN, OUT, GND), the MSOP-8 (YMM) has different pin numbering and physical dimensions versus SOIC-8 and SOT-223. Layout redesign is required when substituting packages; the MIC5239-2.5YMM-TR uses an 8-lead MSOP outline with 0.65 mm pitch, distinct from SOIC's 1.27 mm or SOT-223's 3-pin configuration.