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Microchip Technology MCP1811AT-028/OT
- Part No.:
- MCP1811AT-028/OT
- Manufacturer:
- Microchip Technology
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MCP1811AT-028/OT.pdf
- Description:
- IC REG LINEAR 2.8V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,564
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Product details
Overview
MCP1811AT-028/OT 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 multi-year operation. It operates from 1.8 V to 5.5 V input, supports ceramic output capacitors as small as 1.0 µF, and features output discharge during shutdown - confirming its identity as an MCP1811A-series LDO in SOT-23-3 package used in wearable medical sensors.
For engineers reviewing the MCP1811AT-028/OT datasheet, MCP1811AT-028/OT pinout, MCP1811AT-028/OT application, or MCP1811AT-028/OT equivalent, key selection criteria include guaranteed 2.8 V ±4% output accuracy across –40°C to +85°C, 400 mV typical dropout at 150 mA, and verified 10 nA shutdown current - all critical for energy harvesting and hearing aid power management.
Technical Context
The MCP1811AT-028/OT implements a PMOS pass transistor architecture enabling ultra-low IQ without compromising transient response. Its internal error amplifier drives the pass device with feedback from the 2.8 V reference, while the integrated discharge transistor (RDCH = 100 Ω typical) actively pulls VOUT to GND when SHDN = GND.
It delivers stable regulation under dynamic load steps up to 150 mA with ≤50 mV load regulation and maintains ≥–50 dB PSRR at 1 kHz without input capacitor - essential for noise-sensitive analog front-ends in ultra-low-power sensor nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.8 V ±4% - ensures compatible biasing for 2.8 V logic rails and RF transceivers without external trimming |
| Quiescent Current | 250 nA typical - enables >10-year battery life in coin-cell-powered devices drawing <1 µA average |
| Shutdown Current | 10 nA typical - reduces standby leakage to negligible levels during deep sleep modes |
| Max Output Current | 150 mA - sufficient to power BLE SoCs, MEMS sensors, and low-power microcontrollers simultaneously |
| Dropout Voltage | 400 mV typical at 150 mA - allows operation down to 3.2 V input while maintaining 2.8 V output |
| Stability Capacitor | 1.0 µF ceramic - eliminates need for bulky tantalum or electrolytic capacitors, reducing board area and cost |
| Operating Temp | –40°C to +85°C - validated for industrial and medical environments including body-worn applications |
Pinout & Package
Package: 3-Lead SOT-23 (JEDEC MO-178AA), 2.92 mm × 1.3 mm × 1.0 mm, thermal pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply | Accepts 1.8–5.5 V; must be decoupled locally to suppress noise coupling into regulated output |
| VOUT | Regulated output | Delivers stable 2.8 V; requires ≥1.0 µF X7R ceramic capacitor placed adjacent to pin for stability |
| GND | Ground reference | Low-impedance return path for load and quiescent current; connects directly to output capacitor ground |
Key Features
| Feature | Design Value |
|---|---|
| Output Discharge | Active pull-down via integrated transistor (RDCH = 100 Ω) clears residual charge on VOUT during shutdown - prevents unintended wake-up in stacked-battery or multi-rail systems |
| Ceramic Stability | Guaranteed stable with 1.0 µF X7R ceramic output capacitor - eliminates ESR requirements and simplifies layout vs. traditional LDOs |
| Ultra-Low IQ | 250 nA typical operating current - enables direct connection to energy harvesters (e.g., solar cells, TEGs) without draining stored energy |
| Overcurrent Protection | Foldback current limit (50 mA typical) - protects against short-circuit faults while minimizing thermal stress during sustained overload |
| PSRR Performance | ≥–50 dB at 1 kHz with no CIN - maintains clean supply for ADCs and PLLs even when sharing noisy input rails |
Applications
| Wearable Health Monitor | Hearing Aid Power Management |
|---|---|
Use Scenario: Continuous ECG/PPG sensing in wrist-worn patch using CR2032 battery. IC Role / Device Role / Timing Role: Primary 2.8 V supply for analog front-end and BLE MCU during active and sleep cycles. Use Value: 250 nA quiescent current extends battery life beyond 36 months; output discharge prevents sensor offset drift during mode transitions. | Use Scenario: Miniature in-the-ear hearing aid powered by Zn-air cell. IC Role / Device Role / Timing Role: Regulated 2.8 V rail for low-noise microphone preamp and DSP core. Use Value: 1.0 µF ceramic stability enables smallest possible form factor; –50 dB PSRR suppresses switching noise from digital subsystems. |
| Energy-Harvesting Sensor Node | Smart Card Secure Module |
Use Scenario: Wireless temperature node powered by indoor photovoltaic harvester. IC Role / Device Role / Timing Role: Voltage regulation for ultra-low-power MCU and sub-GHz transceiver during intermittent transmission bursts. Use Value: 400 mV dropout allows operation down to 3.2 V input - maximizes usable energy from low-voltage harvesters. | Use Scenario: Contactless payment card with embedded secure element and NFC interface. IC Role / Device Role / Timing Role: Stable 2.8 V supply for cryptographic IC during RF field activation. Use Value: 10 nA shutdown current prevents battery drain during card storage; ±4% output tolerance meets ISO/IEC 14443 voltage compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-2802E/TT | 250 nA IQ, 2.8 V, but no output discharge; SC70-3 package | Lacks active VOUT discharge - unsuitable where residual voltage must be cleared during shutdown | Select when board space is constrained and discharge is unnecessary |
| TN07028001000G | 200 nA IQ, 2.8 V, 150 mA, no discharge; same SOT-23-3 footprint | Lower IQ but no RDCH transistor; different thermal resistance (θJA = 211°C/W vs. MCP1811A's 211.33°C/W) | Choose for marginal IQ improvement where discharge is not required and sourcing flexibility matters |
Compared with MCP1700T-2802E/TT and TN07028001000G, the MCP1811AT-028/OT uniquely provides integrated output discharge in the same SOT-23-3 package - enabling safe, predictable power sequencing in systems with multiple voltage domains or sensitive analog circuitry.
Availability
MCP1811AT-028/OT is available at Aetrix Electronics and suitable for wearable electronics, medical devices, and energy-harvesting sensor nodes requiring stable component supply over extended production lifecycles.
Supply support for MCP1811AT-028/OT 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 MCP1811A family was engineered specifically for ultra-low-power battery and energy-harvesting applications - prioritizing nanoscale quiescent current, minimal external components, and robust performance across temperature and load extremes.
FAQ
What is the maximum input voltage rating for the MCP1811AT-028/OT?
The MCP1811AT-028/OT has an absolute maximum input voltage rating of +6.0 V. Operation above this level risks permanent damage. For reliable long-term use, the recommended operating input range is 1.8 V to 5.5 V - ensuring compatibility with common Li-ion, coin-cell, and energy-harvesting sources while maintaining regulation at 2.8 V output.
Does the MCP1811AT-028/OT require an input capacitor?
No, the MCP1811AT-028/OT does not require an input capacitor for stability. Its PMOS architecture and internal compensation allow stable operation with only a 1.0 µF ceramic output capacitor. However, adding a 1–10 µF input capacitor improves PSRR and reduces high-frequency noise coupling - particularly beneficial in shared-rail systems with switching regulators.
How does the output discharge function work on the MCP1811AT-028/OT?
The MCP1811AT-028/OT integrates a dedicated discharge transistor (RDCH) that activates when SHDN is pulled low. This transistor provides a 100 Ω typical path from VOUT to GND, rapidly discharging output capacitance to near-zero volts within microseconds. This behavior is exclusive to the 'A' variant (MCP1811A/MCP1812A) and prevents floating outputs that could cause latch-up or false wake-up in downstream circuitry.
Can the MCP1811AT-028/OT be used with a 1.0 µF X5R ceramic capacitor instead of X7R?
Yes - the MCP1811AT-028/OT is specified for stability with 1.0 µF ceramic capacitors, and X5R dielectrics meet the minimum capacitance and ESR requirements. However, X7R is preferred for its superior DC bias and temperature stability: at 2.8 V bias and 85°C, X5R may lose >20% capacitance, potentially degrading transient response. Microchip's validation uses X7R, so X7R is recommended for production designs.
What is the thermal performance of the MCP1811AT-028/OT in SOT-23-3 package?
In the 3-lead SOT-23 package, the MCP1811AT-028/OT has a junction-to-ambient thermal resistance (θJA) of 211.33°C/W on a JEDEC-standard 4-layer FR4 board with 1 oz. copper. At 150 mA output and 3.2 V input (400 mV dropout), power dissipation is 60 mW - resulting in a ~12.7°C junction rise above ambient. No heatsinking is required below 100 mA continuous load in typical PCB layouts.
MCP1811AT-028/OT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- 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-23-5
MCP1811AT-028/OT FAQ
1.How can I place an order for MCP1811AT-028/OT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1811AT-028/OT 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 MCP1811AT-028/OT reliable?
The price and inventory of MCP1811AT-028/OT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1811AT-028/OT is usually 5 days.
3.What payment methods are accepted for MCP1811AT-028/OT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1811AT-028/OT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1811AT-028/OT?
MCP1811AT-028/OT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1811AT-028/OT 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 MCP1811AT-028/OT?
For technical support, including MCP1811AT-028/OT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1811AT-028/OT requirements.
6.How does Aetrix verify that MCP1811AT-028/OT is sourced from the original manufacturer or authorized distributors?
All MCP1811AT-028/OT 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 MCP1811AT-028/OT meets industry standards.
7.What is the process for return or replacement of MCP1811AT-028/OT?
All MCP1811AT-028/OT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1811AT-028/OT, 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 MCP1811AT-028/OT part is unused and in its original packaging.
Return procedure for MCP1811AT-028/OT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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