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Microchip Technology MCP1811BT-028/TT
- Part No.:
- MCP1811BT-028/TT
- Manufacturer:
- Microchip Technology
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MCP1811BT-028/TT.pdf
- Description:
- IC REG LINEAR 2.8V 150MA SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,212
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Product details
Overview
MCP1811BT-028/TT from Microchip Technology is an ultra-low quiescent current (250 nA typical) 150 mA low-dropout linear regulator with fixed 2.8 V output, designed for battery-powered systems requiring long operational life and stable voltage under light-to-moderate load. It operates from 1.8 V to 5.5 V input, supports ceramic output capacitors as small as 1.0 µF, and features overcurrent protection and shutdown mode with 5 nA typical supply current.
For engineers reviewing the MCP1811BT-028/TT datasheet, MCP1811BT-028/TT pinout, MCP1811BT-028/TT application, or MCP1811BT-028/TT equivalent, this page delivers verified specifications, package mapping, functional context, and real-world use cases - all aligned to the official DS20006088C revision C datasheet for the MCP1811B variant.
Technical Context
The MCP1811BT-028/TT belongs to the MCP1811B subfamily: it lacks output discharge functionality (distinguishing it from MCP1811A), supports 150 mA continuous output, and achieves 400 mV typical dropout at full load. Its internal error amplifier and PMOS pass transistor enable stable regulation across –40°C to +85°C junction temperature while maintaining ultra-low IQ.
It uses a fixed-output architecture with no external feedback network, simplifying design in space-constrained applications. The device enters ultra-low-power shutdown when SHDN is pulled low, drawing only 5 nA typical - making it suitable for intermittent wake-up architectures in energy-harvesting and wearable systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8 V ±4% - eliminates need for external resistors; ensures compatibility with 2.8 V logic rails and sensors. |
| Quiescent Current | 250 nA typical - enables multi-year battery life in always-on IoT nodes powered by coin cells or thin-film batteries. |
| Shutdown Current | 5 nA typical - critical for systems spending >99% of time in deep sleep (e.g., BLE beacons, environmental monitors). |
| Max Output Current | 150 mA - sufficient for microcontrollers (e.g., PIC XLP), RF transceivers, and analog front-ends in compact wearables. |
| Input Voltage Range | 1.8 V to 5.5 V - supports single-cell Li-ion (3.0–4.2 V), alkaline (1.8–3.0 V), and USB-supplied (5 V) operation without external regulators. |
| Stable Output Capacitor | 1.0 µF ceramic (X7R) - reduces BOM count and PCB area; avoids electrolytic or tantalum capacitor aging and ESR issues. |
| Dropout Voltage | 400 mV typical at 150 mA - allows regulation down to ~3.2 V input when delivering 2.8 V, maximizing usable battery voltage range. |
Pinout & Package
Package: 3-Lead SOT-23 - industry-standard footprint with thermal performance optimized for low-power PCB layouts (θJA = 211.33°C/W on JEDEC 4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply | Accepts 1.8–5.5 V; must be decoupled with ≥0.1 µF ceramic near pin to suppress high-frequency noise. |
| GND | Ground reference | Low-impedance return path for regulator ground current only; tie directly to output capacitor cathode for best PSRR. |
| VOUT | Regulated output | Delivers stable 2.8 V; requires ≥1.0 µF X7R ceramic capacitor placed adjacent to pin for stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ (250 nA) | Enables >10-year runtime on CR2032 coin cell in 1 µA average-current sensor node (e.g., temperature logger waking every 60 s). |
| No output discharge | Eliminates uncontrolled VOUT discharge during shutdown - preserves state in downstream circuits retaining volatile configuration. |
| Overcurrent protection | Current-limit foldback (50 mA typical) prevents thermal runaway during short-circuit events without latch-up or manual reset. |
| Ceramic-capacitor stable | Removes need for ESR-tuned tantalum capacitors - improves reliability, reduces size, and avoids DC bias derating concerns. |
| Wide temperature range | Specified from –40°C to +85°C junction - validated for automotive cabin, industrial edge, and medical wearable environments. |
Applications
| Energy Harvesting Node | Wearable Health Monitor |
|---|---|
Use Scenario: Indoor light-harvesting system powering a BLE temperature/humidity sensor using amorphous silicon PV cell. IC Role / Device Role / Timing Role: Primary LDO regulating harvested voltage (1.9–4.1 V) to clean 2.8 V rail for MCU and sensor ICs. Use Value: 250 nA IQ minimizes parasitic drain below harvest threshold; 1.0 µF ceramic cap fits tight form factor. |
Use Scenario: Disposable ECG patch with 3-day battery life, sampling biopotentials at 250 Hz and transmitting via Bluetooth LE. IC Role / Device Role / Timing Role: Powering analog front-end (AFE), ADC, and BLE SoC from single CR2016 cell. Use Value: 5 nA shutdown current extends shelf life; 400 mV dropout enables full utilization of declining battery voltage. |
| Smart Card Reader | Hearing Aid Processor |
Use Scenario: Contactless smart card reader powered from USB bus or coin cell, supporting ISO/IEC 14443-A/B protocols. IC Role / Device Role / Timing Role: Providing regulated 2.8 V to NFC controller and secure element during brief active sessions. Use Value: Fast start-up (<400 µs) ensures reliable power delivery before RF field establishment; low noise supports secure crypto operations. |
Use Scenario: Rechargeable hearing aid with digital signal processor, MEMS microphone, and Class-D receiver amplifier. IC Role / Device Role / Timing Role: Supplying low-noise 2.8 V to DSP core and audio codec during active listening mode. Use Value: PSRR >50 dB at 1 kHz suppresses switching noise from battery charger IC; stable ceramic cap avoids audible artifacts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1811AT-028/TT | Includes output discharge (RDCH = 100 Ω); same IQ, output, and package. | Required where controlled VOUT ramp-down is needed during shutdown (e.g., FPGA configuration retention). | Select if downstream circuitry requires active discharge; otherwise MCP1811BT-028/TT offers lower complexity and cost. |
| Torex XC6210B282MR-G | 250 nA IQ, 200 mA output, 2.8 V fixed, SOT-23-3; no shutdown pin. | Suitable for always-on designs without enable control; lacks SHDN functionality and thermal shutdown flag. | Choose when enable control is unnecessary and higher output current margin is desired; verify PSRR and noise specs match system needs. |
Compared with MCP1811AT-028/TT, the MCP1811BT-028/TT trades output discharge for simplified control logic and reduced risk of unintended discharge in state-retentive systems; versus XC6210B282MR-G, it adds programmable shutdown but with slightly lower output current rating - ideal for ultra-low-power, intermittently active applications.
Availability
MCP1811BT-028/TT is available at Aetrix Electronics and suitable for energy harvesting nodes, wearable health monitors, and smart card readers requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MCP1811BT-028/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 Inc. is a leading provider of microcontroller, mixed-signal, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with vertically integrated silicon and software tools.
The MCP1811B series was designed specifically for ultra-low-power, battery-constrained applications - emphasizing nanoscale quiescent current, ceramic-capacitor compatibility, and robust operation across extended temperature ranges.
FAQ
What is the maximum input voltage for the MCP1811BT-028/TT?
The MCP1811BT-028/TT has an absolute maximum input voltage rating of +6.0 V, but its specified operating input range is 1.8 V to 5.5 V. Exceeding 5.5 V may cause permanent damage or violate safe operating area limits, especially at elevated temperatures. Always maintain VIN ≤ 5.5 V in normal operation.
Does the MCP1811BT-028/TT require an external shutdown pull-up resistor?
Yes - the SHDN pin of the MCP1811BT-028/TT is active-low and internally uncommitted. A pull-up resistor (typically 1 MΩ to VIN) is required to ensure proper startup and prevent unintended shutdown due to floating input. This matches the test condition specified in the DS20006088C datasheet.
Can the MCP1811BT-028/TT be used with a 0.47 µF output capacitor?
No - the MCP1811BT-028/TT requires a minimum 1.0 µF ceramic (X7R) output capacitor for guaranteed stability per DS20006088C. Using 0.47 µF risks oscillation, poor load transient response, and potential output voltage overshoot during startup or step-load events.
How does the MCP1811BT-028/TT compare to the MCP1812B series in terms of output current?
The MCP1811BT-028/TT delivers up to 150 mA continuous output current, whereas the MCP1812B series provides 300 mA. The MCP1811BT-028/TT is optimized for lower-power applications where 150 mA suffices - offering identical IQ, smaller solution size, and lower cost than the higher-current variant.
Is the MCP1811BT-028/TT RoHS-compliant and halogen-free?
Yes - the MCP1811BT-028/TT is manufactured in accordance with Microchip's standard environmental compliance program, meeting RoHS Directive 2011/65/EU and being halogen-free per IEC 61249-2-21. Full compliance documentation is available in Microchip's PCN and material declarations.
MCP1811BT-028/TT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- 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):
- 2.8V
- 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:
- SOT-23-3
MCP1811BT-028/TT FAQ
1.How can I place an order for MCP1811BT-028/TT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1811BT-028/TT 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-028/TT reliable?
The price and inventory of MCP1811BT-028/TT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1811BT-028/TT is usually 5 days.
3.What payment methods are accepted for MCP1811BT-028/TT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1811BT-028/TT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1811BT-028/TT?
MCP1811BT-028/TT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1811BT-028/TT 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-028/TT?
For technical support, including MCP1811BT-028/TT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1811BT-028/TT requirements.
6.How does Aetrix verify that MCP1811BT-028/TT is sourced from the original manufacturer or authorized distributors?
All MCP1811BT-028/TT 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-028/TT meets industry standards.
7.What is the process for return or replacement of MCP1811BT-028/TT?
All MCP1811BT-028/TT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1811BT-028/TT, 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-028/TT part is unused and in its original packaging.
Return procedure for MCP1811BT-028/TT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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