Microchip Technology MCP1812BT-010/TT

Overview

MCP1812BT-010/TT from Microchip Technology is a 300 mA ultra-low quiescent current (250 nA typical) fixed-output 1.0 V low-dropout linear regulator in 3-lead SOT-23 package, featuring output discharge during shutdown and stable operation with 2.2 µF ceramic output capacitor. It supports input voltages from 1.8 V to 5.5 V and is designed for energy harvesting and long-life battery-powered wearable electronics.

For engineers reviewing the MCP1812BT-010/TT datasheet, MCP1812BT-010/TT pinout, MCP1812BT-010/TT application, or MCP1812BT-010/TT equivalent, key selection criteria include ultra-low IQ (250 nA), 300 mA output capability, 1.0 V fixed output, output discharge function, and compatibility with minimal 2.2 µF ceramic output capacitance.

Technical Context

The MCP1812BT-010/TT implements a PMOS pass transistor architecture enabling ultra-low dropout voltage (400 mV typical at 300 mA) and near-zero load-dependent quiescent current variation. Its internal discharge transistor (RDCH = 100 Ω typical) actively pulls VOUT to GND when SHDN = GND, eliminating residual voltage hold-up in sleep-mode systems.

This device belongs to the MCP1812A variant group (output discharge enabled, 300 mA rated), operates across –40°C to +85°C junction temperature, and achieves –50 dB PSRR at 1 kHz without input capacitor-critical for noise-sensitive sensor nodes powered by harvested energy sources.

Key Specifications

Pinout & Package

Package: 3-Lead SOT-23 (JEDEC MO-178AA), 2.92 mm × 1.3 mm × 1.0 mm, surface-mount, lead-free and RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1812-010/TT, the MCP1812BT-010/TT adds critical output discharge functionality at only +5 nA typical shutdown penalty; versus XC6210B102MR-G, it delivers 50% higher output current and integrated discharge-enabling robust power sequencing in space-constrained medical and wearable systems.

Availability

MCP1812BT-010/TT is available at Aetrix Electronics and suitable for energy harvesting nodes, smart wearable sensors, and medical patch monitors requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for MCP1812BT-010/TT 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 leading provider of microcontroller, analog, FPGA, and mixed-signal semiconductors, serving automotive, industrial, communications, and consumer markets with high-reliability, low-power solutions.

The MCP1811/12 family was engineered specifically for ultra-low-power, long-life battery and energy-harvesting applications-emphasizing nanoscale quiescent current, ceramic-capacitor stability, and integrated power-control features like output discharge.

FAQ

What is the output voltage tolerance of the MCP1812BT-010/TT?

The MCP1812BT-010/TT provides a fixed 1.0 V output with a tolerance of ±4% over temperature (–40°C to +85°C) and line/load conditions. This specification ensures reliable operation for 1.0 V core supplies in modern ultra-low-power MCUs without requiring external feedback adjustment.

Does the MCP1812BT-010/TT require an input capacitor?

The MCP1812BT-010/TT does not require an input capacitor for stability, though a 1 µF ceramic capacitor is recommended for high-frequency noise suppression. Its design maintains PSRR and transient response without CIN, simplifying layout in space-constrained applications such as hearing aids and smart patches.

How does the output discharge feature work in the MCP1812BT-010/TT?

When the SHDN pin is pulled low, the MCP1812BT-010/TT activates an internal discharge transistor (RDCH ≈ 100 Ω) between VOUT and GND, discharging the output capacitor within microseconds. This prevents residual voltage from interfering with system reset or back-powering sensitive downstream circuitry.

What is the minimum input voltage needed for the MCP1812BT-010/TT to regulate at full 300 mA load?

To sustain 300 mA output at 1.0 V, the MCP1812BT-010/TT requires VIN ≥ 1.4 V (1.0 V + 400 mV typical dropout). At lower loads, dropout decreases-e.g., at 10 mA, dropout is <100 mV-enabling extended battery utilization down to ~1.1 V in low-power states.

Is the MCP1812BT-010/TT compatible with MLCC output capacitors?

Yes-the MCP1812BT-010/TT is explicitly characterized and stabilized with 2.2 µF X7R ceramic output capacitors. Unlike older LDOs requiring ESR-based compensation, this device uses an advanced control loop that remains stable with near-zero-ESR MLCCs, reducing size, cost, and aging-related drift.