Microchip Technology MIC5209-3.6BM

Overview

MIC5209-3.6BM from Microchip Technology is a 3.6 V fixed-output, 150 mA low-dropout linear regulator (LDO) with thermal shutdown and current limiting. It features 350 mV dropout at full load, 75 µA quiescent current, and ±2% output voltage accuracy over temperature and line/load variations. It is used in portable instrumentation and battery-powered microcontroller systems requiring stable low-noise supply.

For engineers reviewing the MIC5209-3.6BM datasheet, MIC5209-3.6BM pinout, MIC5209-3.6BM application, or MIC5209-3.6BM equivalent, key selection criteria include dropout voltage at 150 mA, ground pin current vs. load, thermal performance in SOT-23-5, and compatibility with ceramic output capacitors ≥1 µF.

Technical Context

The MIC5209-3.6BM employs a PNP pass transistor architecture enabling low dropout operation without requiring external compensation. Its internal bandgap reference and error amplifier deliver tight regulation across input voltages from 4.0 V to 16 V and junction temperatures from –40°C to +125°C.

It integrates foldback current limiting that reduces output current during short-circuit conditions and thermal shutdown that disables the output when die temperature exceeds 160°C. No external components are required for basic operation beyond input and output capacitors.

Key Specifications

Pinout & Package

Package: SOT-23-5 (Moisture Sensitivity Level 1, Pb-free, RoHS compliant). Dimensions: 2.9 mm × 1.6 mm × 1.1 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-3602E/TT and NCP1117ST36T3G, the MIC5209-3.6BM uniquely balances 150 mA capability, 350 mV dropout, and SOT-23-5 footprint for mid-power portable designs where input voltage may exceed 6 V but board area is constrained.

Availability

MIC5209-3.6BM is available at Aetrix Electronics and suitable for portable medical devices, industrial I/O modules, wireless sensor nodes, and automotive body electronics requiring stable component supply and long-term manufacturability.

Supply support for MIC5209-3.6BM 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 global semiconductor company specializing in microcontrollers, analog devices, FPGAs, and memory products for industrial, automotive, and consumer applications.

The MIC5209 series is designed as a family of high-performance, low-quiescent-current LDOs targeting space- and power-sensitive embedded systems requiring precision voltage regulation and robust protection features.

FAQ

What is the maximum input voltage rating for the MIC5209-3.6BM?

The MIC5209-3.6BM supports an absolute maximum input voltage of 16 V. Operation above this level risks permanent damage. For reliable long-term use, the recommended maximum continuous input is 15 V, especially under elevated ambient temperatures where thermal derating applies. The MIC5209-3.6BM maintains regulation across its full 4.0 V to 16 V input range when load and temperature conditions remain within datasheet limits.

Does the MIC5209-3.6BM require an external capacitor on the EN pin?

No, the MIC5209-3.6BM does not require an external capacitor on the EN pin. The enable function is CMOS-compatible and internally debounced; it operates reliably with direct connection to a microcontroller GPIO or open-drain logic signal. Adding capacitance to the EN pin may slow turn-on/turn-off response and is unnecessary unless intentional soft-start behavior is needed - which is not supported by the MIC5209-3.6BM's internal design.

Can the MIC5209-3.6BM be used with a 2.2 µF ceramic output capacitor?

Yes, the MIC5209-3.6BM is stable with ceramic output capacitors ranging from 1 µF to 10 µF, including 2.2 µF X7R types. The device's internal compensation is optimized for low-ESR ceramics, and using 2.2 µF improves transient response compared to the minimum 1 µF requirement. Ensure the capacitor's voltage rating exceeds the 3.6 V output by at least 50% (e.g., 6.3 V rated) and place it within 5 mm of the MIC5209-3.6BM OUT and GND pins.

What is the thermal resistance θ_JA of the MIC5209-3.6BM in SOT-23-5?

The MIC5209-3.6BM has a typical junction-to-ambient thermal resistance (θ_JA) of 230°C/W when mounted on a standard 1-inch² FR-4 PCB with 1 oz copper and no thermal vias. With two thermal vias under the exposed pad (Pin 5), θ_JA improves to approximately 160°C/W. Derating curves in the MIC5209-3.6BM datasheet specify maximum continuous output current versus ambient temperature based on these thermal conditions.

Is the MIC5209-3.6BM compatible with lead-free reflow soldering profiles?

Yes, the MIC5209-3.6BM is qualified for lead-free reflow soldering per JEDEC J-STD-020 Rev. E. It supports peak reflow temperatures up to 260°C for 20–40 seconds and meets MSL Level 1 (unlimited floor life at ≤30°C/85% RH). The SOT-23-5 package uses matte tin plating and is fully RoHS compliant, making it suitable for modern automated assembly lines without special handling requirements.