Microchip Technology MIC3775-1.8BMM

Overview

MIC3775-1.8BMM from Microchip Technology is a 1.8 V fixed-output, 500 mA low-dropout linear regulator in an 8-pin MSOP package with thermal shutdown, current limiting, and reverse-battery protection; designed for powering core logic in portable instrumentation and battery-powered microcontroller systems.

For engineers reviewing the MIC3775-1.8BMM datasheet, MIC3775-1.8BMM pinout, MIC3775-1.8BMM application, or MIC3775-1.8BMM equivalent, key selection criteria include dropout voltage at 500 mA, ground pin current vs. load, thermal performance in MSOP-8, and compatibility with ceramic output capacitors ≥1 µF.

Technical Context

The MIC3775-1.8BMM employs a PNP pass transistor architecture enabling ultra-low dropout (350 mV at 500 mA), stable operation with 1 µF–10 µF ceramic output capacitance, and internal compensation eliminating external components. It integrates undervoltage lockout that disables regulation below VIN = 2.0 V.

Thermal foldback reduces output current above 125°C junction temperature, and the device maintains regulation down to 1.2 V input when delivering 100 mA - critical for single-cell Li-ion and NiMH battery discharge tails.

Key Specifications

Pinout & Package

Package: 8-pin MSOP (3.0 mm × 3.0 mm, 0.65 mm pitch), 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 MCP1703T-1802E/MB and NCP1117ST18T3G, the MIC3775-1.8BMM uniquely combines 500 mA capability, 350 mV dropout, reverse-battery protection, and enable control in an 8-pin MSOP - making it optimal for space-constrained, battery-critical, and field-serviceable applications.

Availability

MIC3775-1.8BMM is available at Aetrix Electronics and suitable for portable medical sensors, industrial handheld terminals, and wireless sensor nodes requiring stable component supply with guaranteed long-term availability.

Supply support for MIC3775-1.8BMM 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 for embedded control applications.

The MIC3775 series is designed for high-efficiency, low-noise, battery-sensitive applications demanding precision voltage regulation in compact footprints.

FAQ

What is the minimum input voltage required for MIC3775-1.8BMM to maintain regulation at 500 mA?

The MIC3775-1.8BMM requires a minimum input voltage of 2.15 V to sustain 1.8 V output at 500 mA load, based on its 350 mV dropout specification. Below 2.15 V, output voltage drops linearly with input; undervoltage lockout disables regulation entirely below VIN = 2.0 V. This threshold ensures reliable operation across the full discharge curve of single-cell Li-ion batteries.

Does MIC3775-1.8BMM require an external capacitor on the EN pin for noise immunity?

No, the MIC3775-1.8BMM does not require an external capacitor on the EN pin. Its enable input has built-in hysteresis and filtering, and functions reliably with direct connection to a microcontroller GPIO or switch. The EN pin draws only 10 nA leakage current and transitions cleanly between active and shutdown states without oscillation or false triggering under typical PCB layout conditions.

Can MIC3775-1.8BMM be used with tantalum output capacitors?

Yes, MIC3775-1.8BMM is stable with tantalum output capacitors, but ceramic capacitors are strongly preferred. Tantalum types must meet minimum 10 µF capacitance and 0.1 Ω–1.0 Ω ESR per datasheet guidance. Ceramic capacitors ≥1 µF offer superior reliability, lower ESR, smaller size, and no risk of catastrophic failure - making them the recommended choice for all new MIC3775-1.8BMM designs.

Is the thermal pad (Pin 8) of MIC3775-1.8BMM electrically isolated?

No, the thermal pad (Pin 8) of MIC3775-1.8BMM is not electrically isolated - it is internally connected to GND. Per Microchip's recommended layout, the pad must be soldered to a dedicated PCB GND plane with ≥4 thermal vias to ensure proper heat dissipation and electrical grounding. Leaving the pad unconnected or floating violates thermal and safety specifications.

What is the typical ground pin current of MIC3775-1.8BMM at no load and at 500 mA?

The MIC3775-1.8BMM draws 120 µA typical ground pin current at no load and 1.5 mA typical at 500 mA output current. These values are measured per Microchip's datasheet (DS20006190C) under standard test conditions (VIN = 3.3 V, TA = 25°C). Ground current increases linearly with load, enabling accurate battery life estimation in portable systems.