Microchip Technology MCP1812BT-010/LB

Overview

MCP1812BT-010/LB from Microchip Technology is a 300 mA ultra-low-quiescent-current LDO linear regulator with fixed 1.0 V output, 250 nA typical operating IQ, and 5 nA typical shutdown current (MCP1812B variant). It operates from 1.8 V to 5.5 V input, supports ceramic output capacitors down to 2.2 µF, and delivers stable low-noise power for energy-harvesting sensor nodes and hearing aids.

For engineers reviewing the MCP1812BT-010/LB datasheet, MCP1812BT-010/LB pinout, MCP1812BT-010/LB application, or MCP1812BT-010/LB equivalent, key selection criteria include its 1.0 V fixed output, 300 mA load capability, 5 nA shutdown current, UDFN-4 package footprint, and compatibility with micro-power MCUs in battery-constrained systems.

Technical Context

The MCP1812BT-010/LB implements a PMOS pass transistor architecture enabling ultra-low dropout voltage (400 mV typical at 300 mA) and minimal ground current (180–220 µA across full load range). Its internal error amplifier and reference are optimized for stability with small ceramic capacitors and low-temperature drift.

As an MCP1812B-series device, it omits the output discharge transistor found in MCP1812A variants-ensuring no active pull-down of VOUT during shutdown, preserving external circuit state. It is rated for –40°C to +85°C junction operation and features overcurrent protection with foldback limiting.

Key Specifications

Pinout & Package

Package: 4-Lead 1 × 1 mm UDFN with exposed thermal pad (EP), JEDEC-compliant, 91.05°C/W θJA on 4-layer FR4 board.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1812-010/DB, MCP1812BT-010/LB provides lower thermal resistance and 0.3 mm² board area savings; versus TPL7407LDR, it delivers dedicated LDO performance without unnecessary driver circuitry, simplifying design validation and reducing EMI risk.

Availability

MCP1812BT-010/LB is available at Aetrix Electronics and suitable for energy harvesting, wearable electronics, and medical devices requiring stable component supply, long-lifecycle support, and guaranteed traceability.

Supply support for MCP1812BT-010/LB 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 microcontrollers, analog components, and timing solutions, serving automotive, industrial, and consumer markets with high-reliability silicon.

The MCP1811/12 family was designed specifically for ultra-low-power battery-operated systems where nanoscale quiescent current and minimal footprint are critical-enabling next-generation wearables and maintenance-free IoT endpoints.

FAQ

What is the maximum input voltage rating for the MCP1812BT-010/LB?

The MCP1812BT-010/LB has an absolute maximum input voltage of +6.0 V. However, its specified operating input range is 1.8 V to 5.5 V. Exceeding 5.5 V may cause permanent damage or violate reliability specifications-even briefly-so system design must enforce clamping or regulation before the MCP1812BT-010/LB input.

Does the MCP1812BT-010/LB include output discharge functionality?

No, the MCP1812BT-010/LB does not include output discharge. As an MCP1812B-series part, it omits the internal discharge transistor present in MCP1812A variants. When SHDN is pulled low, VOUT floats and retains its charge-preserving downstream circuit state without external bleed resistors.

What is the minimum output capacitance required for stability with the MCP1812BT-010/LB?

The MCP1812BT-010/LB requires a minimum of 2.2 µF ceramic (X7R) output capacitance for guaranteed stability across temperature and load. Using less than 2.2 µF risks oscillation or poor transient response; larger values (e.g., 4.7 µF) improve ripple rejection but are not required.

Can the MCP1812BT-010/LB operate from a single alkaline cell?

Yes-the MCP1812BT-010/LB operates down to 1.8 V input and maintains regulation until input drops within ~400 mV of the 1.0 V output. A fresh alkaline cell (1.5 V nominal) can power the MCP1812BT-010/LB only until voltage falls below ~1.4 V, so it is best paired with two-series alkaline (3.0 V nominal) or Li-ion (3.6 V nominal) sources for full-range operation.

Is the exposed thermal pad (EP) on the MCP1812BT-010/LB electrically connected?

Yes, the exposed thermal pad (EP) on the MCP1812BT-010/LB is internally connected to GND. It must be soldered to a PCB thermal pad tied to the main ground plane via ≥4 thermal vias to achieve the specified 91.05°C/W θJA and prevent thermal throttling at 300 mA continuous load.