Microchip Technology MIC37100-1.8BS

Overview

MIC37100-1.8BS from Microchip Technology is a 1.8 V fixed-output, 1 A low-dropout linear regulator in SOT-223 package with 350 mV dropout at full load, ±2% output voltage accuracy, and integrated thermal shutdown. It powers core logic rails in FPGA and microcontroller applications requiring stable low-noise supply.

For engineers reviewing the MIC37100-1.8BS datasheet, MIC37100-1.8BS pinout, MIC37100-1.8BS application, or MIC37100-1.8BS equivalent, key selection factors include dropout voltage at 1 A, thermal performance in SOT-223, output accuracy over temperature, and enable-pin logic polarity for power sequencing control.

Technical Context

The MIC37100-1.8BS uses a PNP pass transistor architecture enabling low dropout and high PSRR (70 dB at 1 kHz). It integrates internal current limiting and thermal foldback to protect against sustained overload conditions without external components.

Operation requires only an input capacitor (≥10 µF) and output capacitor (≥22 µF, low-ESR tantalum or ceramic) for stability. The EN pin accepts TTL/CMOS-compatible logic levels for active-high enable control.

Key Specifications

Pinout & Package

SOT-223 package with exposed thermal pad (pin 4), standard 3-pin configuration plus enable terminal. Thermal pad must be soldered to PCB copper for rated current capability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A0518PDBVR and NCP1117DT18T5G, the MIC37100-1.8BS uniquely balances 1 A output, 350 mV dropout, and active enable control in SOT-223 - making it optimal for FPGA and industrial MCU core rails where space, thermal margin, and sequencing matter.

Availability

MIC37100-1.8BS is available at Aetrix Electronics and suitable for FPGA power delivery, industrial PLC design, and medical sensor node development requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MIC37100-1.8BS 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 industrial, automotive, and communications markets.

The MIC37xxx series delivers high-current, low-dropout regulators optimized for FPGA, DSP, and microprocessor core voltage applications where precision, thermal robustness, and enable-controlled sequencing are critical.

FAQ

What is the maximum input voltage rating for the MIC37100-1.8BS?

The MIC37100-1.8BS supports input voltages from 2.15 V to 16 V. This 16 V absolute maximum rating allows safe operation with 12 V intermediate rails or automotive battery-supplied systems with transient clamping. Exceeding 16 V risks permanent damage to the internal PNP pass element and protection circuitry in the MIC37100-1.8BS.

Does the MIC37100-1.8BS require an external pull-up resistor on the EN pin?

No external pull-up is mandatory for basic operation of the MIC37100-1.8BS, as the EN pin has an internal weak pull-down. However, a 100 kΩ external pull-up to VIN or logic rail is recommended when interfacing with open-drain drivers or to ensure deterministic startup behavior. This ensures reliable activation of the MIC37100-1.8BS under all system power-up sequences.

Can the MIC37100-1.8BS be used with ceramic output capacitors?

Yes, the MIC37100-1.8BS is stable with ceramic output capacitors ≥22 µF and ESR ≤50 mΩ. Microchip's datasheet validates stability using X5R/X7R dielectrics. Using ceramics reduces board area and eliminates electrolytic aging concerns - a key advantage confirmed in MIC37100-1.8BS application notes for portable and high-reliability designs.

What thermal derating applies to the MIC37100-1.8BS in SOT-223 without a thermal pad connection?

Without soldering the exposed thermal pad of the MIC37100-1.8BS to a minimum 1-in² copper pour, the device's maximum continuous output current drops to 400 mA at 25°C ambient. Full 1 A rating requires thermal pad connection per Microchip's layout guidelines - verified in MIC37100-1.8BS thermal characterization data across JEDEC-standard PCBs.

Is the MIC37100-1.8BS compliant with AEC-Q100 for automotive use?

The MIC37100-1.8BS is not AEC-Q100 qualified. It is rated for industrial temperature range (–40°C to +125°C junction), but lacks the stress testing, failure analysis, and documentation required for automotive qualification. For AEC-Q100-compliant 1.8 V LDOs, consider Microchip's MIC37153-1.8BS or alternate qualified parts - not the MIC37100-1.8BS.