Microchip Technology MCP1811BT-010/LB

Overview

MCP1811BT-010/LB from Microchip Technology is a 150 mA ultra-low-quiescent-current LDO linear regulator with fixed 1.0 V output, 250 nA typical operating current, and 5 nA typical shutdown current. It operates from 1.8V to 5.5V input and supports ceramic output capacitors as low as 1.0 µF. It is designed for energy harvesting and long-life battery-powered systems where sleep-mode power budget is critical.

For engineers reviewing the MCP1811BT-010/LB datasheet, MCP1811BT-010/LB pinout, MCP1811BT-010/LB application, or MCP1811BT-010/LB equivalent, this page delivers verified specifications, package mapping, functional role in ultra-low-power systems, and validated alternative options - all grounded in Microchip's DS20006088C datasheet and official package documentation.

Technical Context

The MCP1811BT-010/LB belongs to the MCP1811B variant group (no output discharge), delivering 1.0 V at up to 150 mA with dropout voltage ≤600 mV at full load. Its internal architecture uses a PMOS pass element enabling ultra-low IQ and stable operation down to 1.0 µF ceramic output capacitance.

It features active shutdown control via SHDN pin (logic-low threshold ≤20% VIN), thermal shutdown protection, overcurrent limiting (~250 mA typical), and foldback current limiting under short-circuit conditions. Junction temperature range is –40°C to +85°C, with maximum junction temperature rated at +125°C.

Key Specifications

Pinout & Package

Package: 4-Lead 1 × 1 mm UDFN with exposed thermal pad (EP). Compact footprint ideal for space-constrained wearables and medical patches.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1811BT-010/LB, the XC6210B102MR-G adds output discharge but requires pinout and layout changes, while the RP111N101D-TR-F offers identical functional behavior in a marginally larger package with reduced input voltage margin - making MCP1811BT-010/LB optimal for space- and ultra-low-IQ–constrained designs.

Availability

MCP1811BT-010/LB is available at Aetrix Electronics and suitable for energy harvesting nodes, smart medical patches, and long-life smart cards requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for MCP1811BT-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 Inc. is a leading provider of microcontrollers, analog, FPGA, and timing solutions, serving automotive, industrial, communications, and consumer markets with vertically integrated silicon and software.

The MCP1811/12 family was designed specifically for ultra-low-power battery and energy-harvesting applications - prioritizing nanoscale quiescent current, minimal external components, and robust operation across wide temperature and load ranges.

FAQ

What is the output voltage tolerance of the MCP1811BT-010/LB?

The MCP1811BT-010/LB has a fixed 1.0 V output with ±4% tolerance over temperature (–40°C to +85°C), line, and load conditions per DS20006088C. This ensures consistent biasing for 1.0 V–rated digital cores and analog sensors without trimming or feedback networks.

Does the MCP1811BT-010/LB include output discharge functionality?

No, the MCP1811BT-010/LB is part of the MCP1811B series, which omits the output discharge transistor. When SHDN is pulled low, VOUT floats rather than actively discharging - preserving stored energy in downstream capacitors and avoiding unintended resets.

What is the minimum input voltage required for regulation at full 150 mA load?

Per DS20006088C, the MCP1811BT-010/LB requires VIN ≥ VR + VDROPOUT(MAX). With VR = 1.0 V and VDROPOUT(MAX) = 600 mV at 150 mA, the minimum input is 1.6 V. However, the absolute minimum specified VIN is 1.8 V - so 1.8 V is the guaranteed operational floor.

Can the MCP1811BT-010/LB be used with a 0.47 µF ceramic output capacitor?

No - the MCP1811BT-010/LB requires ≥1.0 µF ceramic (X7R) output capacitance for guaranteed stability across temperature and load. Using 0.47 µF risks oscillation or poor transient response, as confirmed in Section 4.2 and Figure 2-5 of DS20006088C.

What package type does the MCP1811BT-010/LB use, and is thermal pad soldering required?

The MCP1811BT-010/LB uses the 4-Lead 1 × 1 mm UDFN package with an exposed thermal pad (EP). Per Table 3-1 and thermal resistance data in DS20006088C, the EP must be soldered to a thermal land with ≥4 vias to inner ground planes to achieve θJA = 91.05°C/W and prevent thermal shutdown under sustained 150 mA load.