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Microchip Technology MCP1811BT-012/LB
- Part No.:
- MCP1811BT-012/LB
- Manufacturer:
- Microchip Technology
- Package:
- SC-70, SOT-323
- Datasheet:
-
MCP1811BT-012/LB.pdf
- Description:
- IC REG LINEAR 1.2V 150MA SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,186
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Product details
Overview
MCP1811BT-012/LB from Microchip Technology is an ultra-low quiescent current (250 nA typical) 150 mA low-dropout linear regulator with fixed 1.2 V output, designed for energy-constrained battery-powered systems. It operates from 1.8 V to 5.5 V input, supports ceramic output capacitors as small as 1.0 µF, and features 5 nA typical shutdown current - making it ideal for wearable electronics and medical hearing aids requiring multi-year operation on coin cells.
For engineers reviewing the MCP1811BT-012/LB datasheet, MCP1811BT-012/LB pinout, MCP1811BT-012/LB application, or MCP1811BT-012/LB equivalent, this page delivers verified electrical specs, package mapping to 4-lead 1×1 mm UDFN, functional role in ultra-low-power sleep architectures, and validated alternative options for long-life LDO selection.
Technical Context
The MCP1811BT-012/LB belongs to the MCP1811B variant group - meaning it provides 150 mA output current and **no output discharge** during shutdown (SHDN = GND), distinguishing it from MCP1811A variants. Its internal error amplifier and PMOS pass transistor enable stable regulation with minimal dropout (400–600 mV at 150 mA) and high PSRR (−50 dB at 1 kHz).
It is optimized for operation across −40°C to +85°C junction temperature, uses a single external 1.0 µF X7R ceramic capacitor for stability, and integrates overcurrent protection with foldback limiting (50 mA at RLOAD = 1 Ω). The device requires no bypass capacitor on SHDN and exhibits negligible load/line regulation drift over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.2 V ±4% - ensures precise biasing for 1.2 V logic rails and low-voltage microcontrollers. |
| Quiescent Current | 250 nA typical - enables >10-year battery life in always-on sensor nodes powered by CR2032 cells. |
| Shutdown Current | 5 nA typical - critical for deep-sleep modes where system leakage must be sub-10 nA. |
| Max Output Current | 150 mA - sufficient for BLE SoCs, low-power ADCs, and MEMS sensors during active bursts. |
| Input Voltage Range | 1.8 V to 5.5 V - compatible with single-cell Li-ion, LiFePO₄, alkaline, and NiMH sources. |
| Dropout Voltage | 400–600 mV at 150 mA - allows regulation down to ~1.6 V input, extending usable battery voltage range. |
| Stability Capacitor | 1.0 µF ceramic (X7R) - reduces BOM count and PCB area vs. tantalum; enables compact wearables. |
Pinout & Package
Package: 4-Lead 1 × 1 mm UDFN with exposed thermal pad (EP). Optimized for thermal performance on 4-layer FR4 boards (θJA = 91.05°C/W) and space-constrained layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 1.8–5.5 V; requires local 1 µF ceramic decoupling near pin for noise suppression. |
| SHDN | Active-high enable control | Pulled high (>70% VIN) to enable; driven low to enter 5 nA shutdown - no external pull-up needed if controlled by MCU GPIO. |
| VOUT | Regulated 1.2 V output | Delivers up to 150 mA; connects directly to load and 1.0 µF ceramic output capacitor (X7R). |
| GND | Ground reference | Must connect to quiet ground plane; ties return path of output capacitor to minimize PSRR degradation. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ (250 nA) | Enables >10-year runtime on 220 mAh coin cell powering intermittent 10 µA sensor reads. |
| No output discharge | Preserves state on downstream circuits during shutdown - avoids unintended resets in multi-rail systems. |
| Ceramic-cap stable (1 µF) | Eliminates need for larger, less reliable tantalum caps; reduces footprint by >50% vs. legacy LDOs. |
| Overcurrent foldback | Limits short-circuit power dissipation to safe levels without latch-off - protects during board-level faults. |
| −40°C to +85°C operation | Validated across full industrial temperature range - suitable for outdoor wearables and medical body-worn devices. |
Applications
| Wearable Health Monitors | Energy-Harvesting Sensors |
|---|---|
|
Use Scenario: Continuous ECG/PPG sensing in smart patches powered by thin-film batteries. IC Role / Device Role / Timing Role: Primary 1.2 V supply for ultra-low-power analog front-end and BLE radio during active measurement cycles. Use Value: 250 nA quiescent current extends battery life beyond 3 years while maintaining 150 mA burst capability for signal processing. |
Use Scenario: Indoor light-harvesting node powering environmental sensors using amorphous silicon PV cells. IC Role / Device Role / Timing Role: Voltage regulation stage converting variable 2.0–4.5 V harvested voltage to stable 1.2 V for microcontroller and RF transceiver. Use Value: Wide 1.8–5.5 V input range accommodates low-light PV output; 1 µF ceramic stability simplifies energy buffer design. |
| Hearing Aid Processors | Smart Card Controllers |
|
Use Scenario: Miniaturized digital hearing aid with real-time audio DSP and wireless configuration. IC Role / Device Role / Timing Role: Core power rail for ASIC and low-noise audio codec; enabled only during audio processing windows. Use Value: 5 nA shutdown current prevents battery drain during standby; low noise (<270 µVrms) avoids audible artifacts. |
Use Scenario: Contactless payment card with embedded secure element and NFC interface. IC Role / Device Role / Timing Role: Regulated 1.2 V supply for cryptographic processor during RF field activation (13.56 MHz). Use Value: Fast start-up (<400 µs) ensures immediate response to reader field; 1.2 V output matches secure IC core voltage requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-1202E/MB | Same 1.2 V output, 250 nA IQ, but only 250 mA max output; includes output discharge; packaged in SOT-23. | Requires output discharge for reset-sensitive systems; higher current headroom useful for future-proofing. | Select when output discharge is required and SOT-23 layout compatibility exists. |
| Torex XC6210B122MR-G | 1.2 V, 250 nA IQ, 150 mA output, but no shutdown pin; fixed 1.2 V only; SC70-5 package. | Simpler enable-free operation; lacks active shutdown control - unsuitable for MCU-governed power sequencing. | Select for cost-sensitive, always-on applications where shutdown control is unnecessary. |
Compared with MCP1811BT-012/LB, MCP1700T-1202E/MB adds output discharge at the cost of slightly larger SOT-23 footprint, while XC6210B122MR-G removes shutdown functionality entirely - making MCP1811BT-012/LB the optimal choice for designs requiring both ultra-low shutdown current and precise enable control in minimal area.
Availability
MCP1811BT-012/LB is available at Aetrix Electronics and suitable for wearable electronics, medical hearing aids, and energy-harvesting sensors requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MCP1811BT-012/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 microcontroller, mixed-signal, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with high-reliability semiconductor products.
The MCP1811 family was designed specifically for ultra-low-power, long-life battery applications - targeting multi-year operation in wearables, medical implants, and IoT edge nodes where nanoscale quiescent current is non-negotiable.
FAQ
What is the maximum output current of the MCP1811BT-012/LB?
The MCP1811BT-012/LB delivers up to 150 mA of continuous output current. This is confirmed in the Electrical Characteristics table (DS20006088C, page 4) under "Maximum Continuous Output Current" for MCP1811X devices. Performance remains stable across −40°C to +85°C ambient, with current limiting engaging at ~250 mA (typical) to protect the device.
Does the MCP1811BT-012/LB include output discharge functionality?
No, the MCP1811BT-012/LB does not include output discharge. As a member of the MCP1811B variant group (per Table 1, DS20006088C, page 3), it omits the discharge transistor (RDCH) present in MCP1811A variants. When SHDN is pulled low, VOUT floats - preserving downstream voltage states during shutdown.
Which package type is used by the MCP1811BT-012/LB?
The MCP1811BT-012/LB is packaged in a 4-Lead 1 × 1 mm UDFN with exposed thermal pad (EP), as indicated by the "/LB" suffix per Microchip's packaging nomenclature. This package offers superior thermal performance (θJA = 91.05°C/W) and minimal footprint - ideal for space-constrained wearables and medical devices.
What is the minimum input voltage required for regulation at 1.2 V output?
The minimum input voltage for regulation depends on load: at 150 mA, dropout is 400–600 mV, so VIN must be ≥1.6 V to maintain 1.2 V output. Per the datasheet (page 4), the absolute minimum VIN is 1.8 V for IOUT ≤50 mA, and 2.0 V for IOUT ≤150 mA - ensuring margin for line regulation and transient response.
Can the MCP1811BT-012/LB operate with a 1 µF ceramic output capacitor?
Yes, the MCP1811BT-012/LB is explicitly characterized and guaranteed stable with a 1.0 µF X7R ceramic output capacitor (DS20006088C, page 1). This eliminates the need for larger, less reliable tantalum or aluminum electrolytic capacitors - reducing size, cost, and failure risk in portable designs.
MCP1811BT-012/LB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.6V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 0.5 µA
- Current - Supply (Max):
- 110 µA
- PSRR:
- 50dB (1kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current
- Operating Temperature:
- -40°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
MCP1811BT-012/LB FAQ
1.How can I place an order for MCP1811BT-012/LB through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1811BT-012/LB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MCP1811BT-012/LB reliable?
The price and inventory of MCP1811BT-012/LB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1811BT-012/LB is usually 5 days.
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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1811BT-012/LB transactions.
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MCP1811BT-012/LB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1811BT-012/LB order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MCP1811BT-012/LB?
For technical support, including MCP1811BT-012/LB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1811BT-012/LB requirements.
6.How does Aetrix verify that MCP1811BT-012/LB is sourced from the original manufacturer or authorized distributors?
All MCP1811BT-012/LB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MCP1811BT-012/LB meets industry standards.
7.What is the process for return or replacement of MCP1811BT-012/LB?
All MCP1811BT-012/LB units undergo pre-shipment inspection (PSI). If there is an issue with MCP1811BT-012/LB, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MCP1811BT-012/LB part is unused and in its original packaging.
Return procedure for MCP1811BT-012/LB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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