Microchip Technology MIC5247-1.8BM5TR

Overview

MIC5247-1.8BM5TR from Microchip Technology is a 1.8 V fixed-output, 150 mA low-dropout (LDO) linear regulator in SOT-23-5 package with 350 mV dropout at full load, ±2% output voltage accuracy, and 60 µA quiescent current - used in portable battery-powered microcontroller supply rails.

For engineers reviewing the MIC5247-1.8BM5TR datasheet, MIC5247-1.8BM5TR pinout, MIC5247-1.8BM5TR application, or MIC5247-1.8BM5TR equivalent, key selection criteria include dropout voltage under 150 mA load, thermal shutdown behavior, reverse-current protection, and stability with 1 µF ceramic output capacitor.

Technical Context

The MIC5247-1.8BM5TR employs a PNP pass transistor architecture enabling stable regulation down to 350 mV input-to-output differential. It integrates internal current limiting, thermal foldback, and overtemperature shutdown to protect against sustained overload conditions.

Designed for single-supply operation from 2.5 V to 16 V input, it delivers regulated 1.8 V output with ≤30 mV line regulation (over 2.5 V–16 V VIN) and ≤15 mV load regulation (over 1 mA–150 mA IOUT), supporting noise-sensitive analog and digital circuitry.

Key Specifications

Pinout & Package

SOT-23-5 surface-mount package with exposed thermal pad (pin 5 connected to GND internally); 2.9 mm × 1.6 mm footprint, 1.1 mm height, JEDEC MO-178 compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700-1802E/TO and XC6206P182MR-G, the MIC5247-1.8BM5TR uniquely combines enable control, comprehensive fault protection, and SOT-23-5 compatibility - making it optimal for robust, space-constrained embedded designs requiring reliability across temperature and load extremes.

Availability

MIC5247-1.8BM5TR is available at Aetrix Electronics and suitable for wearable electronics, industrial sensor nodes, and medical diagnostics equipment requiring stable component supply and long-term production continuity.

Supply support for MIC5247-1.8BM5TR 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 embedded control applications.

The MIC5247 family targets space-constrained, battery-sensitive systems needing reliable low-noise, low-IQ LDO regulation with integrated protection - especially in portable instrumentation and industrial edge nodes.

FAQ

What is the maximum input voltage rating for the MIC5247-1.8BM5TR?

The MIC5247-1.8BM5TR supports an absolute maximum input voltage of 16 V. Operation beyond this level risks permanent damage to the internal pass transistor and protection circuitry. For reliable long-term use, design input rails to stay within 2.5 V to 16 V, with derating recommended above 125°C ambient.

Does the MIC5247-1.8BM5TR require an external capacitor on the EN pin?

No, the MIC5247-1.8BM5TR does not require an external capacitor on the EN pin. Its enable input has internal pull-up biasing and is CMOS-compatible. A simple resistor divider or direct GPIO connection suffices; adding capacitance may slow turn-on timing and is unnecessary for standard enable sequencing.

Can the MIC5247-1.8BM5TR operate with a 1 µF ceramic output capacitor only?

Yes, the MIC5247-1.8BM5TR is internally compensated and fully stable with a minimum 1 µF X5R/X7R ceramic output capacitor. No additional ESR or series resistance is required - unlike many older LDOs - simplifying layout and eliminating capacitor-related failure modes in high-reliability designs.

Is reverse-current protection active during shutdown of the MIC5247-1.8BM5TR?

Yes, reverse-current protection remains active whenever VIN is below VOUT, regardless of EN state. This includes shutdown, input brownout, or hot-swap scenarios. The MIC5247-1.8BM5TR blocks current flow from VOUT to VIN down to 0 V input, preventing backfeed into upstream supplies or damaged regulators.

What thermal performance can be expected from the MIC5247-1.8BM5TR in a standard 2-layer PCB layout?

With the thermal pad (pin 5) soldered to a 100 mm² copper pour on a 2-layer FR-4 board, the MIC5247-1.8BM5TR achieves θJA ≈ 160°C/W. At 150 mA load and 25°C ambient, junction temperature rises ~8.4°C - well within safe operating range. Larger copper areas further reduce thermal resistance.