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Microchip Technology MCP1811AT-028/LB
- Part No.:
- MCP1811AT-028/LB
- Manufacturer:
- Microchip Technology
- Package:
- SC-70, SOT-323
- Datasheet:
-
MCP1811AT-028/LB.pdf
- Description:
- IC REG LINEAR 2.8V 150MA SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,466
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Product details
Overview
MCP1811AT-028/LB from Microchip Technology is a 150 mA ultra-low-quiescent-current LDO regulator with fixed 2.8 V output, 250 nA typical IQ, and shutdown capability (10 nA typical ISHDN). It operates from 1.8 V to 5.5 V input and supports ceramic output capacitors as low as 1.0 µF. Designed for energy harvesting and long-life battery-powered systems, it delivers stable low-noise power to microcontrollers and sensors in wearable medical devices.
For engineers reviewing the MCP1811AT-028/LB datasheet, MCP1811AT-028/LB pinout, MCP1811AT-028/LB application, or MCP1811AT-028/LB equivalent, this page provides verified technical context, package mapping to 4-lead 1×1 mm UDFN, real-world load regulation performance, and validated alternative options for ultra-low-power LDO selection.
Technical Context
The MCP1811AT-028/LB implements a PMOS pass transistor architecture enabling ultra-low dropout voltage (400 mV typical at 150 mA) and minimal ground current (90–110 µA across load). Its internal error amplifier maintains ±25 mV load regulation from 1 mA to 150 mA while supporting fast dynamic response-400 µs start-up delay and sub-1 ms rise time after SHDN assertion.
It integrates an active discharge transistor (RDCH = 100 Ω typical) that pulls VOUT to GND during shutdown, preventing floating outputs in battery-critical systems. The device is specified for –40°C to +85°C junction temperature and achieves –50 dB PSRR at 1 kHz with no input capacitor, making it suitable for noise-sensitive analog front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8 V ±4% - ensures compatibility with 2.8 V logic rails and RF front-end biasing without external feedback. |
| Max Output Current | 150 mA - sufficient to power XLP-class MCUs, BLE SoCs, and low-power sensors without thermal derating on standard PCBs. |
| Quiescent Current | 250 nA typical - enables >10-year battery life in coin-cell-powered devices operating in deep-sleep mode. |
| Shutdown Current | 10 nA typical - reduces system standby loss to negligible levels in energy-harvesting nodes with intermittent wake cycles. |
| Dropout Voltage | 400 mV typical at 150 mA - allows operation down to 3.2 V input when powering 2.8 V loads from single Li-ion or two alkaline cells. |
| Stability | Stable with 1.0 µF ceramic COUT - eliminates need for bulky tantalum or electrolytic capacitors, reducing BOM cost and footprint. |
| PSRR | –50 dB @ 1 kHz - suppresses switching noise from DC/DC converters sharing the same input rail, critical for ADC reference integrity. |
Pinout & Package
Package: 4-Lead 1 × 1 mm UDFN with exposed thermal pad (EP), optimized for high thermal efficiency on compact PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply | Accepts 1.8–5.5 V; must be decoupled locally with ≥1 µF ceramic capacitor to ensure stability and transient response. |
| SHDN | Active-low enable control | Pulled high internally; driven low to enter 10 nA shutdown mode with VOUT discharge enabled. |
| VOUT | Regulated output | Delivers fixed 2.8 V; requires ≥1.0 µF ceramic capacitor to GND for loop stability and low-noise operation. |
| GND | Ground reference | Low-impedance return path for load and quiescent current; connects directly to output capacitor ground for optimal PSRR. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ (250 nA) | Enables multi-year operation on CR2032 coin cells in IoT sensor nodes with 1-second wake intervals. |
| Output discharge on shutdown | Prevents back-powering of upstream circuitry and ensures deterministic reset sequencing in battery-backed systems. |
| Ceramic-capacitor stability (1 µF) | Reduces solution size by >50% vs. traditional LDOs requiring 10–22 µF tantalum, easing layout in space-constrained wearables. |
| Wide input range (1.8–5.5 V) | Supports direct connection to single-cell Li-ion (3.0–4.2 V), two alkaline (2.4–3.2 V), or USB-supplied (4.75–5.25 V) sources. |
| –40°C to +85°C operation | Validated for use in outdoor environmental sensors and industrial edge nodes without derating. |
Applications
| Energy Harvesting Node | Wearable Medical Sensor |
|---|---|
Use Scenario: Solar- or thermal-harvested energy powers intermittent data logging in remote environmental monitors. IC Role / Device Role / Timing Role: LDO regulator providing clean, stable 2.8 V to ultra-low-power MCU and analog sensor interface. Use Value: 250 nA quiescent current minimizes leakage loss during multi-hour sleep cycles, maximizing usable harvested energy. |
Use Scenario: Continuous glucose monitor worn on skin with CR2032 battery and Bluetooth LE transmission. IC Role / Device Role / Timing Role: Primary power regulator for analog front-end and BLE SoC during active sensing and radio bursts. Use Value: 150 mA output supports peak BLE transmit current while 1 µF ceramic stability enables miniaturized PCB design. |
| Smart Card Reader | Hearing Aid DSP Module |
Use Scenario: Contactless smart card reader powered from NFC field or coin cell, requiring rapid turn-on. IC Role / Device Role / Timing Role: Low-noise 2.8 V supply for secure element and RF transceiver ICs. Use Value: 400 µs start-up delay and <1 ms rise time ensure compliant power delivery within ISO/IEC 14443 timing windows. |
Use Scenario: Miniature hearing aid with digital signal processor, MEMS microphone, and receiver driver. IC Role / Device Role / Timing Role: Main power regulator delivering regulated 2.8 V to DSP core and audio codecs. Use Value: Output discharge prevents residual charge on VOUT from interfering with zero-crossing detection during power-down. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6210B282MR-G | 250 nA IQ, 150 mA, 2.8 V fixed, SOT-25 package (5-pin); no output discharge. | Lacks VOUT discharge function; requires external pull-down if deterministic shutdown behavior is needed. | Select when board space permits larger SOT-25 and discharge is not required for system reset integrity. |
| Ricoh RP111N281D-TR-F | 250 nA IQ, 200 mA, 2.8 V fixed, DFN1006-4 package; 1 µF ceramic stable; no discharge. | Higher output current but no discharge transistor; slightly higher dropout (450 mV @ 150 mA). | Choose for marginally higher load headroom where discharge is handled externally or not needed. |
Compared with MCP1811AT-028/LB, the XC6210B282MR-G offers identical IQ and output voltage but lacks integrated discharge, while the RP111N281D-TR-F adds 50 mA current headroom at the cost of higher dropout and no discharge-making MCP1811AT-028/LB optimal for systems requiring both ultra-low IQ and controlled shutdown behavior.
Availability
MCP1811AT-028/LB is available at Aetrix Electronics and suitable for energy harvesting nodes, wearable medical sensors, and smart card readers requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MCP1811AT-028/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 is a leading provider of microcontroller, analog, FPGA, and mixed-signal semiconductor solutions, headquartered in Chandler, Arizona.
The MCP1811A/B series was designed specifically for ultra-low-power battery-operated applications demanding nanoscale quiescent current, fast wake-up, and robust stability with miniature ceramic capacitors.
FAQ
What is the maximum input voltage rating for the MCP1811AT-028/LB?
The MCP1811AT-028/LB has an absolute maximum input voltage rating of +6.0 V. Operation beyond this voltage risks permanent damage. For reliable continuous operation, the input must remain within the recommended 1.8 V to 5.5 V range, with minimum VIN determined by both load current and dropout voltage-e.g., ≥3.2 V at 150 mA to maintain regulation at 2.8 V output.
Does the MCP1811AT-028/LB require an external output capacitor, and what value is recommended?
Yes, the MCP1811AT-028/LB requires an external output capacitor for stability. A minimum of 1.0 µF ceramic (X7R or better) capacitor is specified and sufficient for all operating conditions. Larger values improve transient response but are not necessary for stability-enabling compact, low-cost designs in space-constrained applications like hearing aids and smart cards.
How does the output discharge feature of the MCP1811AT-028/LB function during shutdown?
When SHDN is pulled low, the MCP1811AT-028/LB activates an internal discharge transistor (RDCH ≈ 100 Ω) between VOUT and GND. This actively discharges the output capacitor, pulling VOUT to near-zero volts within microseconds. This prevents back-powering of upstream circuitry and ensures predictable reset behavior-critical in battery-backed systems and energy-harvesting nodes.
What is the typical dropout voltage of the MCP1811AT-028/LB at full load?
The typical dropout voltage of the MCP1811AT-028/LB is 400 mV at 150 mA output current and +25°C. At worst-case conditions (–40°C to +85°C, max load), dropout remains ≤600 mV. This allows the MCP1811AT-028/LB to regulate 2.8 V output from inputs as low as 3.4 V, supporting operation across the full discharge curve of two alkaline cells or single Li-ion batteries.
Is the MCP1811AT-028/LB compatible with PCB assembly processes using lead-free reflow profiles?
Yes, the MCP1811AT-028/LB in its 4-lead 1×1 mm UDFN package is qualified for standard lead-free reflow soldering per JEDEC J-STD-020. Its maximum peak reflow temperature is 260°C, and the package meets IPC/JEDEC moisture sensitivity level 1 (MSL-1), meaning it can be stored indefinitely at ambient conditions without baking prior to assembly.
MCP1811AT-028/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):
- 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-70-3
MCP1811AT-028/LB FAQ
1.How can I place an order for MCP1811AT-028/LB through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1811AT-028/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 MCP1811AT-028/LB reliable?
The price and inventory of MCP1811AT-028/LB 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/LB is usually 5 days.
3.What payment methods are accepted for MCP1811AT-028/LB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1811AT-028/LB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1811AT-028/LB?
MCP1811AT-028/LB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1811AT-028/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 MCP1811AT-028/LB?
For technical support, including MCP1811AT-028/LB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1811AT-028/LB requirements.
6.How does Aetrix verify that MCP1811AT-028/LB is sourced from the original manufacturer or authorized distributors?
All MCP1811AT-028/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 MCP1811AT-028/LB meets industry standards.
7.What is the process for return or replacement of MCP1811AT-028/LB?
All MCP1811AT-028/LB units undergo pre-shipment inspection (PSI). If there is an issue with MCP1811AT-028/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 MCP1811AT-028/LB part is unused and in its original packaging.
Return procedure for MCP1811AT-028/LB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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