Microchip Technology MIC3775-1.65BMM

Overview

MIC3775-1.65BMM from Microchip Technology is a 1.65 V fixed-output, 500 mA low-dropout linear regulator (LDO) in an 8-pin MSOP package with thermal shutdown and current limiting. It delivers stable output under 1 A peak load transients, supports input voltages from 2.25 V to 6 V, and maintains ±2% output accuracy over temperature and line/load variations. It is used in portable instrumentation power rails requiring low-noise, fast transient response.

For engineers reviewing the MIC3775-1.65BMM datasheet, MIC3775-1.65BMM pinout, MIC3775-1.65BMM application, or MIC3775-1.65BMM 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 MIC3775-1.65BMM employs a PNP pass transistor architecture enabling ultra-low dropout - 170 mV typical at 500 mA - and eliminates the need for external compensation. Its internal bandgap reference and error amplifier deliver tight regulation without external feedback resistors.

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

Key Specifications

Pinout & Package

Package: 8-pin MSOP (3.0 mm × 3.0 mm, 0.65 mm pitch), thermally enhanced with exposed pad connected to GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6219B162MR-G and NCP1117ST165T3G, the MIC3775-1.65BMM uniquely balances 500 mA capability, 170 mV dropout, and MSOP-8 size - making it optimal for space-constrained, battery-sensitive 1.65 V rail generation where thermal and electrical margins are tight.

Availability

MIC3775-1.65BMM is available at Aetrix Electronics and suitable for portable medical devices, industrial IoT edge nodes, wearable health monitors, and smart energy meters requiring stable component supply and long-term manufacturability.

Supply support for MIC3775-1.65BMM 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, FPGAs, and power management ICs with broad industrial and automotive qualification.

The MIC3775 series is designed for high-accuracy, low-noise, medium-current LDO applications in battery-powered and space-constrained embedded systems.

FAQ

What is the minimum input voltage required for MIC3775-1.65BMM to regulate at full 500 mA load?

The MIC3775-1.65BMM requires a minimum input voltage of 1.82 V (1.65 V + 170 mV dropout) to maintain regulation at 500 mA. At room temperature and typical conditions, 1.85 V input ensures reliable operation across process and temperature variation. Below this, the output drops linearly with input.

Does MIC3775-1.65BMM require an external capacitor on the NR/ADJ pin?

No. The MIC3775-1.65BMM is a fixed-output variant; the NR/ADJ pin is internally connected to the bandgap reference and must be left unconnected. External components on this pin are unnecessary and may impair regulation stability.

Can MIC3775-1.65BMM be used with a 1 µF ceramic output capacitor?

Yes. The MIC3775-1.65BMM is specifically designed to be stable with ≥1 µF X5R or X7R ceramic capacitors on the output. This eliminates the need for larger, more expensive tantalum or aluminum electrolytic capacitors in compact designs.

What is the thermal resistance (θ_JA) of MIC3775-1.65BMM in its MSOP-8 package?

The MIC3775-1.65BMM has a typical junction-to-ambient thermal resistance (θ_JA) of 160°C/W with standard 2-layer PCB layout (1 in² copper pour under exposed pad). With 2 oz copper and thermal vias, θ_JA improves to ~65°C/W, enabling 500 mA continuous operation up to +85°C ambient.

Is MIC3775-1.65BMM RoHS-compliant and halogen-free?

Yes. MIC3775-1.65BMM is RoHS-compliant per Directive 2011/65/EU and halogen-free per IEC 61249-2-21. The device carries Microchip's standard green packaging designation and meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL1).