Microchip Technology MIC37151-1.8BR

Overview

MIC37151-1.8BR from Microchip Technology is a 1.5A low-dropout linear regulator with fixed 1.8V output, 350mV dropout at full load, and ±2% output voltage accuracy over line, load, and temperature. It operates from 2.25V to 16V input and features thermal shutdown and current limiting for embedded power management in FPGA core supplies and microcontroller I/O rails.

For engineers reviewing the MIC37151-1.8BR datasheet, MIC37151-1.8BR pinout, MIC37151-1.8BR application, or MIC37151-1.8BR equivalent, key selection criteria include dropout voltage at 1.5A, output accuracy under transient load steps, thermal performance in SO-8 packages, and compatibility with ceramic output capacitors ≥2.2µF.

Technical Context

The MIC37151-1.8BR uses a PNP pass transistor architecture enabling stable regulation with minimal headroom. Its internal reference and error amplifier deliver ±2% initial accuracy and <0.02%/V line regulation across 2.25V–16V input range.

Designed for low-noise, low-ripple applications, it achieves 65µV_RMS output noise (10Hz–100kHz) and supports fast transient response with 10µs typical recovery time from 75% load step. No external compensation is required.

Key Specifications

Pinout & Package

Package: SO-8 (Surface-Mount, 8-pin Small Outline). Exposed pad thermally connected to ground for enhanced power dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6219B182MR-G and NCP1117ST18T3G, the MIC37151-1.8BR uniquely delivers 1.5A output with 350mV dropout in an SO-8 package-enabling higher power density and better thermal performance in space-constrained FPGA and microcontroller applications.

Availability

MIC37151-1.8BR is available at Aetrix Electronics and suitable for industrial automation, medical imaging, and automotive ADAS applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for MIC37151-1.8BR 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 power management ICs for industrial, automotive, and communications markets.

The MIC37151-1.8BR belongs to Microchip's MIC37xxx family of high-current, low-dropout regulators designed specifically for powering noise-sensitive digital loads including FPGA cores, ASIC I/O, and high-speed interface circuits.

FAQ

What is the maximum input voltage rating for the MIC37151-1.8BR?

The MIC37151-1.8BR supports an absolute maximum input voltage of 16V. Operation above this level risks permanent damage to the internal pass transistor and protection circuitry. For reliable long-term use, design input rails to stay within 2.25V–16V, with appropriate derating for temperature and transient spikes. The MIC37151-1.8BR datasheet specifies 16V as the absolute maximum rating, not recommended operating condition.

Does the MIC37151-1.8BR require an external capacitor on the ADJ/SENSE pin?

No-the MIC37151-1.8BR is a fixed-output regulator with internally connected feedback. The ADJ/SENSE pin is not accessible for external adjustment and must not be connected to external components. The MIC37151-1.8BR relies solely on its internal resistor divider and reference to maintain 1.8V output accuracy; no external compensation or sensing network is needed or supported.

Can the MIC37151-1.8BR operate with a 2.2V input supply?

No-the MIC37151-1.8BR has a minimum input voltage specification of 2.25V. At 2.2V, the device cannot maintain regulation due to insufficient headroom for the 350mV dropout voltage plus internal bias requirements. Attempting to operate below 2.25V may result in output collapse or unstable behavior. Always verify input voltage margins using the MIC37151-1.8BR's specified 2.25V–16V operating range.

Is the exposed thermal pad on the SO-8 package of the MIC37151-1.8BR electrically isolated?

No-the exposed thermal pad on the MIC37151-1.8BR's SO-8 package is internally connected to GND. It must be soldered to a PCB ground plane for both thermal performance and electrical stability. Leaving the pad floating or connecting it to any other net violates the MIC37151-1.8BR's thermal and EMI design requirements and may cause overheating or regulation failure.

What is the typical quiescent current of the MIC37151-1.8BR in shutdown mode?

The MIC37151-1.8BR draws 1µA typical quiescent current when the EN pin is driven low. This ultra-low shutdown current enables extended battery life in portable equipment and supports compliance with energy-saving standards such as Energy Star and EU CoC Tier 2. The MIC37151-1.8BR maintains this spec across –40°C to +125°C junction temperature range.