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Microchip Technology MCP1811BT-028/LT
- Part No.:
- MCP1811BT-028/LT
- Manufacturer:
- Microchip Technology
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
MCP1811BT-028/LT.pdf
- Description:
- IC REG LINEAR 2.8V 150MA SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,655
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Product details
Overview
MCP1811BT-028/LT 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 energy harvesting and long-life 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 overcurrent protection and output discharge during shutdown.
For engineers reviewing the MCP1811BT-028/LT datasheet, MCP1811BT-028/LT pinout, MCP1811BT-028/LT application, or MCP1811BT-028/LT equivalent, this page delivers verified technical context, package mapping, real-world use cases in wearable electronics and medical devices, and validated alternative options for ultra-low-power LDO selection.
Technical Context
The MCP1811BT-028/LT belongs to the MCP1811X family of 150 mA LDOs optimized for sub-1 µA standby operation. Its internal architecture includes a precision bandgap reference, error amplifier, and PMOS pass transistor enabling stable regulation with minimal dropout voltage (400 mV typical at 150 mA).
It integrates a dedicated discharge transistor (RDCH ≤ 100 Ω) activated when SHDN = GND, ensuring rapid VOUT collapse to prevent back-powering of downstream circuitry - a key requirement in systems with multiple power domains or energy-harvesting sources.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8 V ±4% - ensures compatibility with 2.8 V logic rails and sensors without external feedback components. |
| Quiescent Current | 250 nA typical - enables multi-year battery life in sleep-mode applications such as smart wearables and hearing aids. |
| Shutdown Current | 10 nA typical (MCP1811A variant) - minimizes leakage during deep-sleep states where system power must be near-zero. |
| Max Output Current | 150 mA - sufficient to power microcontrollers, BLE radios, and analog front-ends in compact portable devices. |
| Input Voltage Range | 1.8 V to 5.5 V - supports direct connection to single-cell Li-ion, LiFePO₄, alkaline, or energy-harvesting transducers. |
| Dropout Voltage | 400 mV typical at 150 mA - allows regulation down to ~3.2 V input when delivering full load at 2.8 V output. |
| Stability | Stable with 1.0 µF ceramic output capacitor - reduces BOM cost and PCB area versus tantalum or electrolytic alternatives. |
Pinout & Package
Package: 3-Lead SOT-23 (standard footprint, JEDEC MO-178AA). Thermal performance: θJA = 211.33°C/W on 4-layer FR4 board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply | Accepts 1.8–5.5 V input; requires local 1 µF ceramic bypass capacitor for stability and noise suppression. |
| VOUT | Regulated output | Delivers fixed 2.8 V; connects directly to load and output capacitor (min. 1.0 µF X7R ceramic). |
| GND | Ground reference | Low-impedance return path for regulator ground current only; tie to quiet ground plane or output capacitor return. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ | 250 nA typical operating current enables >10-year battery life in 10 µA average-load applications. |
| Output discharge | Integrated discharge switch (RDCH ≤ 100 Ω) pulls VOUT to GND within microseconds upon SHDN assertion. |
| Ceramic-capacitor stability | Guaranteed stability with 1.0 µF X7R ceramic output cap - eliminates ESR requirements and simplifies layout. |
| Overcurrent protection | Foldback current limit (50 mA typical) prevents thermal runaway during short-circuit events. |
| Wide temperature range | Specified from –40°C to +85°C junction temperature - suitable for industrial and medical environments. |
Applications
| Energy Harvesting Node | Smart Wearable Sensor |
|---|---|
Use Scenario: Powering a wireless environmental sensor node powered by a thermoelectric generator or solar cell with intermittent, low-voltage output. IC Role / Device Role / Timing Role: Primary voltage regulator converting variable harvested energy into stable 2.8 V for MCU and RF transceiver. Use Value: 250 nA quiescent current ensures >95% of harvested energy reaches the load during idle periods, maximizing usable runtime per charge cycle. |
Use Scenario: Supplying power to an optical heart-rate monitor in a fitness wristband with coin-cell battery. IC Role / Device Role / Timing Role: Main LDO for analog front-end and BLE SoC, enabling fast wake-up from deep sleep. Use Value: Output discharge function prevents residual voltage on VOUT from interfering with MCU reset sequencing after shutdown. |
| Hearing Aid Audio Front-End | Secure Smart Card |
Use Scenario: Regulating power to ultra-low-noise microphone preamplifiers and ADCs in digital hearing aids. IC Role / Device Role / Timing Role: Low-noise, low-IQ supply rail for analog signal chain components requiring clean 2.8 V bias. Use Value: 169.31 µVrms integrated output noise (10 Hz–100 kHz) preserves SNR in high-gain audio paths without additional filtering. |
Use Scenario: Providing regulated 2.8 V to contactless smart card ICs during NFC field coupling. IC Role / Device Role / Timing Role: Standby power source that remains active during RF field detection and transitions instantly to full load during transaction. Use Value: 400 µs typical start-up delay from SHDN ensures rapid response to card reader field activation without voltage droop. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1811AT-2802E/MB | Same 2.8 V output, but in 4-lead 1×1 mm UDFN package with exposed thermal pad; 5 nA shutdown current (B variant), no output discharge. | Lacks output discharge; better thermal performance (θJA = 91.05°C/W) for higher ambient temperature or continuous 150 mA loads. | Select when thermal headroom is critical and output discharge is not required. |
| Torex XC6210B282MR-G | 2.8 V fixed output, 250 nA IQ, but only 100 mA max output; no integrated discharge transistor; requires 1.0 µF ceramic cap. | Lower output current capability limits use to sub-100 mA loads; no discharge function necessitates external MOSFET for VOUT collapse. | Select when cost sensitivity outweighs need for 150 mA drive or discharge control. |
Compared with MCP1811AT-2802E/MB and XC6210B282MR-G, the MCP1811BT-028/LT uniquely combines 150 mA drive, output discharge, and SOT-23 compatibility - making it optimal for space-constrained, battery-sensitive designs requiring fast, controlled power-down behavior.
Availability
MCP1811BT-028/LT is available at Aetrix Electronics and suitable for energy harvesting nodes, wearable electronics, and medical devices requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MCP1811BT-028/LT 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, headquartered in Chandler, Arizona.
The MCP1811X family was designed specifically for ultra-low-power, long-life battery and energy-harvesting applications - emphasizing nanoscale quiescent current, ceramic-capacitor compatibility, and robust protection features.
FAQ
What is the maximum input voltage rating for the MCP1811BT-028/LT?
The MCP1811BT-028/LT has an absolute maximum input voltage rating 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 if below the 6.0 V absolute maximum limit. Always maintain VIN ≤ 5.5 V in normal operation.
Does the MCP1811BT-028/LT include output discharge functionality?
Yes, the MCP1811BT-028/LT includes integrated output discharge. When the SHDN pin is pulled low, the internal discharge transistor (RDCH ≤ 100 Ω) actively pulls VOUT to GND, ensuring rapid voltage collapse - critical for preventing back-powering in multi-rail systems. This feature is confirmed in the device's functional block diagram and electrical specifications table.
What output capacitor value is required for stability with the MCP1811BT-028/LT?
The MCP1811BT-028/LT requires a minimum 1.0 µF X7R ceramic output capacitor for guaranteed stability across all operating conditions. The datasheet explicitly validates stability with 1.0 µF ceramic (not tantalum or electrolytic), enabling smaller footprint and lower ESR without compensation networks.
Is the MCP1811BT-028/LT compatible with lead-free reflow soldering processes?
Yes, the MCP1811BT-028/LT in SOT-23 package is rated for standard lead-free reflow profiles per JEDEC J-STD-020. Its maximum peak reflow temperature is 260°C, and it complies with RoHS Directive 2011/65/EU and REACH SVHC regulations - confirmed in Microchip's packaging documentation for the /LT suffix.
What is the typical dropout voltage of the MCP1811BT-028/LT at full load?
The typical dropout voltage of the MCP1811BT-028/LT is 400 mV at 150 mA output current and +25°C junction temperature. At 85°C, the maximum dropout rises to 600 mV. This means the device can sustain 2.8 V output with as little as 3.2 V input under nominal conditions - essential for extending battery runtime in single-cell systems.
MCP1811BT-028/LT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- 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:
- SC-70-5
MCP1811BT-028/LT FAQ
1.How can I place an order for MCP1811BT-028/LT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1811BT-028/LT 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/LT reliable?
The price and inventory of MCP1811BT-028/LT 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/LT is usually 5 days.
3.What payment methods are accepted for MCP1811BT-028/LT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1811BT-028/LT transactions.
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4.How is shipping managed for MCP1811BT-028/LT?
MCP1811BT-028/LT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1811BT-028/LT 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/LT?
For technical support, including MCP1811BT-028/LT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1811BT-028/LT requirements.
6.How does Aetrix verify that MCP1811BT-028/LT is sourced from the original manufacturer or authorized distributors?
All MCP1811BT-028/LT 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/LT meets industry standards.
7.What is the process for return or replacement of MCP1811BT-028/LT?
All MCP1811BT-028/LT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1811BT-028/LT, 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/LT part is unused and in its original packaging.
Return procedure for MCP1811BT-028/LT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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