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Microchip Technology MCP1811AT-040/LB
- Part No.:
- MCP1811AT-040/LB
- Manufacturer:
- Microchip Technology
- Package:
- SC-70, SOT-323
- Datasheet:
-
MCP1811AT-040/LB.pdf
- Description:
- IC REG LINEAR 4V 150MA SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,037
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Product details
Overview
MCP1811AT-040/LB from Microchip Technology is an ultra-low quiescent current (250 nA typical) 150 mA low-dropout linear regulator with fixed 4.0 V output, 1.8–5.5 V input range, and output discharge functionality-designed for energy harvesting and long-life battery-powered systems such as hearing aids and smart wearables.
For engineers reviewing the MCP1811AT-040/LB datasheet, MCP1811AT-040/LB pinout, MCP1811AT-040/LB application, or MCP1811AT-040/LB equivalent, key selection criteria include shutdown current (10 nA typical), dropout voltage (400 mV at 150 mA), ceramic capacitor stability (1.0 µF min), and thermal performance in 4-lead 1×1 mm UDFN package.
Technical Context
The MCP1811AT-040/LB implements a PMOS pass transistor architecture enabling ultra-low IQ operation and fast start-up (400 µs delay from SHDN). Its integrated discharge transistor (100 Ω typical) actively pulls VOUT to GND during shutdown, preventing residual voltage hold-up in power-sensitive sleep modes.
It operates across –40°C to +85°C junction temperature and maintains ±4% output accuracy over load (0–150 mA), line (VIN = 2.4–5.5 V), and temperature-leveraging internal bandgap reference and error amplifier compensation optimized for 1 µF ceramic output capacitance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 4.0 V ±4% - ensures stable supply for 3.3 V–4.2 V logic rails without external feedback. |
| Quiescent Current | 250 nA typical - enables >10-year battery life in microamp-level sleep applications. |
| Shutdown Current | 10 nA typical - minimizes leakage during deep-sleep states in energy-harvesting nodes. |
| Max Output Current | 150 mA - supports moderate-power peripherals (e.g., BLE radios, sensors) while retaining ultra-low IQ. |
| Dropout Voltage | 400 mV at 150 mA - allows regulation down to VIN = 4.4 V, maximizing usable battery voltage range. |
| Stability | With ≥1.0 µF X7R ceramic COUT - eliminates need for bulky tantalum/Al-elec caps, reducing BOM cost and footprint. |
| Operating Temp | –40°C to +85°C - qualified for industrial and medical wearable environments. |
Pinout & Package
Package: 4-Lead 1 × 1 mm UDFN with exposed thermal pad (EP) for enhanced thermal dissipation (θJA = 91.05°C/W on JEDEC 4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply | Accepts 1.8–5.5 V; requires local 1 µF ceramic bypass capacitor near pin for PSRR and stability. |
| SHDN | Active-low enable/disable control | Pulled high internally; driven low to enter 10 nA shutdown with VOUT discharge enabled. |
| VOUT | Regulated output | Delivers 4.0 V ±4%; must connect ≥1.0 µF ceramic capacitor directly to this pin and GND. |
| GND | Power ground reference | Low-impedance return path for regulator core; ties to quiet ground plane or output cap return for optimal noise rejection. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ operation | 250 nA typical enables multi-year runtime on coin cells or harvested energy sources. |
| Integrated output discharge | 100 Ω discharge transistor clears VOUT within microseconds of SHDN assertion-critical for system reset integrity. |
| Ceramic capacitor compatibility | Stable with 1.0 µF X7R ceramic output cap-reduces solution size by >50% vs. electrolytic alternatives. |
| Wide input voltage range | 1.8–5.5 V supports single-cell Li-ion, LiFePO₄, alkaline, and energy-harvesting inputs without pre-regulation. |
| Overcurrent protection | Foldback current limit (50 mA) prevents thermal runaway during short-circuit events. |
Applications
| Energy Harvesting Nodes | Medical Hearing Aids |
|---|---|
Use Scenario: Powering wireless sensor transmitters powered by piezoelectric or solar harvesters with intermittent, low-current output. IC Role / Device Role / Timing Role: Primary voltage regulator delivering stable 4.0 V to MCU and RF IC during burst transmission. Use Value: 250 nA quiescent current extends operational duty cycle between harvest events; 1 µF ceramic stability simplifies PCB layout in space-constrained modules. | Use Scenario: Supplying ultra-low-power DSP and audio codec in miniaturized in-the-ear hearing aids. IC Role / Device Role / Timing Role: Main LDO providing regulated 4.0 V rail to analog front-end and digital signal processor during active listening mode. Use Value: 10 nA shutdown current preserves battery charge during user idle periods; 400 mV dropout maximizes usable battery voltage down to 4.4 V. |
| Smart Wearable Sensors | Long-Life IoT Endpoints |
Use Scenario: Power management in wrist-worn health monitors using CR2032 coin cell with multi-year target lifetime. IC Role / Device Role / Timing Role: System regulator enabling MCU sleep at sub-µA levels while maintaining clean 4.0 V supply for wake-up circuitry. Use Value: Output discharge ensures rapid VOUT collapse upon sleep entry-eliminating unintended peripheral wake-ups or leakage paths. | Use Scenario: Remote environmental sensor node deployed in inaccessible locations, powered by primary lithium thionyl chloride battery. IC Role / Device Role / Timing Role: Primary power regulator supplying 4.0 V to LoRaWAN transceiver and microcontroller during periodic data bursts. Use Value: ±4% output tolerance and –40°C to +85°C operation guarantee reliable startup and regulation across extreme outdoor temperature ranges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-4002E/MB | Higher IQ (1.6 µA typical), no output discharge, same 4.0 V output and SOT-23-3 package. | Lacks active VOUT discharge-unsuitable where rapid rail collapse is required for system reset. | Select when lowest possible cost and standard SOT-23 footprint are prioritized over nanoamp IQ and discharge. |
| TPL7407LPGEDR | 7-channel high-side driver with integrated 4.0 V LDO (200 mA), 2.5 µA IQ, no discharge. | Multi-function IC-adds GPIO driving capability but sacrifices dedicated LDO optimization and ultra-low IQ. | Select only if simultaneous LED/relay driving and regulation are needed; not a direct functional replacement. |
Compared with MCP1700T-4002E/MB and TPL7407LPGEDR, the MCP1811AT-040/LB uniquely delivers 250 nA IQ with active output discharge in a 1 mm² UDFN package-making it the only choice for applications demanding both decade-scale battery life and deterministic power-rail sequencing.
Availability
MCP1811AT-040/LB is available at Aetrix Electronics and suitable for energy harvesting nodes, medical hearing aids, and smart wearable sensors requiring stable component supply with guaranteed long-term manufacturability.
Supply support for MCP1811AT-040/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 microcontrollers, analog devices, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with vertically integrated silicon and software offerings.
The MCP1811A/B series is part of Microchip's ultra-low-power LDO portfolio, engineered specifically for battery- and energy-harvesting–powered applications where nanoscale quiescent current and rapid shutdown response are critical design requirements.
FAQ
What is the maximum input voltage rating for the MCP1811AT-040/LB?
The MCP1811AT-040/LB has an absolute maximum input voltage rating of +6.0 V. Operation above 5.5 V is not recommended, as the device is specified for continuous operation only up to 5.5 V per its electrical characteristics table. Exceeding this may compromise reliability or cause permanent damage.
Does the MCP1811AT-040/LB require an external resistor divider to set the output voltage?
No, the MCP1811AT-040/LB is a fixed-output regulator with factory-trimmed 4.0 V output. It does not support adjustable output via external resistors-no feedback network is required or supported. The "T" suffix denotes fixed-voltage configuration, and the "040" explicitly indicates 4.0 V nominal output.
Is the MCP1811AT-040/LB compatible with 1 µF ceramic output capacitors?
Yes, the MCP1811AT-040/LB is fully stable with a minimum 1.0 µF X7R ceramic output capacitor, as confirmed in the datasheet's "Stable with Ceramic Output Capacitor" feature and AC/DC specifications. This eliminates ESR requirements and enables compact, low-noise designs without tantalum or aluminum electrolytic capacitors.
How does the output discharge function operate in the MCP1811AT-040/LB?
When SHDN is pulled low, the MCP1811AT-040/LB activates an internal discharge transistor (RDCH = 100 Ω typical) between VOUT and GND, rapidly discharging the output capacitor. This ensures VOUT falls to near-zero volts within microseconds-preventing back-powering of upstream circuitry and enabling clean system resets in ultra-low-power applications.
What is the thermal resistance (θJA) of the MCP1811AT-040/LB in its 4-lead UDFN package?
The MCP1811AT-040/LB in the 4-Lead 1×1 mm UDFN package has a measured θJA of 91.05°C/W on a JEDEC-standard 4-layer FR4 board with 1 oz. copper and thermal vias. This value assumes proper use of the exposed thermal pad (EP) connected to a solid ground plane for optimal heat dissipation.
MCP1811AT-040/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):
- 4V
- 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-040/LB FAQ
1.How can I place an order for MCP1811AT-040/LB through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1811AT-040/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-040/LB reliable?
The price and inventory of MCP1811AT-040/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-040/LB is usually 5 days.
3.What payment methods are accepted for MCP1811AT-040/LB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1811AT-040/LB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1811AT-040/LB?
MCP1811AT-040/LB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1811AT-040/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-040/LB?
For technical support, including MCP1811AT-040/LB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1811AT-040/LB requirements.
6.How does Aetrix verify that MCP1811AT-040/LB is sourced from the original manufacturer or authorized distributors?
All MCP1811AT-040/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-040/LB meets industry standards.
7.What is the process for return or replacement of MCP1811AT-040/LB?
All MCP1811AT-040/LB units undergo pre-shipment inspection (PSI). If there is an issue with MCP1811AT-040/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-040/LB part is unused and in its original packaging.
Return procedure for MCP1811AT-040/LB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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