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Microchip Technology MCP1811AT-028/LT
- Part No.:
- MCP1811AT-028/LT
- Manufacturer:
- Microchip Technology
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
MCP1811AT-028/LT.pdf
- Description:
- IC REG LINEAR 2.8V 150MA SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,874
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Product details
Overview
MCP1811AT-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, shutdown capability (10 nA typical), and stable operation with 1.0 µF ceramic output capacitor. It operates across 1.8V–5.5V input and delivers precision regulation for battery-powered wearable electronics and energy-harvesting nodes.
For engineers reviewing the MCP1811AT-028/LT datasheet, MCP1811AT-028/LT pinout, MCP1811AT-028/LT application, or MCP1811AT-028/LT equivalent, key selection criteria include its 2.8 V fixed output, 400 mV dropout at 150 mA, output discharge function, thermal performance in UDFN package, and compatibility with micro-power MCU sleep modes.
Technical Context
The MCP1811AT-028/LT implements a PMOS pass transistor architecture enabling ultra-low IQ and fast start-up (400 µs delay from SHDN). Its internal error amplifier and reference maintain ±4% output accuracy over -40°C to +85°C junction temperature and load currents up to 150 mA.
It integrates a dedicated discharge transistor (RDCH = 100 Ω typical) activated during shutdown (SHDN = GND), ensuring rapid VOUT collapse to prevent back-powering of downstream circuitry - a critical feature for systems requiring strict power sequencing and zero-leakage sleep states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8 V ±4% - ensures stable supply for 2.8 V logic rails without external feedback components. |
| Max Output Current | 150 mA - sufficient to power ultra-low-power MCUs, sensors, and BLE radios in intermittent active mode. |
| Quiescent Current | 250 nA typical - enables multi-year battery life in devices drawing µA-average current. |
| Shutdown Current | 10 nA typical - minimizes standby drain in always-on monitoring applications. |
| Dropout Voltage | 400 mV at 150 mA - allows operation down to VIN = 3.2 V while maintaining regulation, extending usable battery range. |
| Stability | With 1.0 µF ceramic COUT - reduces BOM count and PCB area vs. electrolytic/tantalum alternatives. |
| PSRR | -50 dB at 1 kHz - suppresses ripple from noisy switching supplies or shared battery rails. |
Pinout & Package
Package: 4-Lead 1 × 1 mm UDFN with exposed thermal pad (EP) - optimized for high thermal efficiency (θJA = 91.05°C/W) in space-constrained wearables and medical patches.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply | Accepts 1.8V–5.5V; must be decoupled with ≥1 µF ceramic capacitor near pin for stability and PSRR. |
| SHDN | Active-low enable/disable control | Pulled high internally; driven low to enter 10 nA shutdown with output discharge enabled. |
| VOUT | Regulated output | Delivers 2.8 V ±4%; requires 1.0 µF ceramic capacitor to ground for loop stability and low noise. |
| GND | Ground reference | Return path for load and quiescent current; tie directly to quiet ground plane or output capacitor cathode. |
| EP | Exposed thermal pad | Internally connected to GND; must be soldered to PCB thermal pad for optimal θJA and reliability. |
Key Features
| Feature | Design Value |
|---|---|
| Output discharge on shutdown | Active discharge via integrated 100 Ω transistor ensures VOUT collapses rapidly (<1 ms), preventing back-powering of sensitive peripherals. |
| Ultra-low IQ operation | 250 nA typical IQ enables >10-year battery life in coin-cell-powered devices operating at 1% duty cycle. |
| Ceramic capacitor stability | Stable with only 1.0 µF X7R ceramic output cap - eliminates ESR requirements and improves reliability over tantalum. |
| Wide input voltage range | 1.8V–5.5V operation supports single-cell Li-ion, LiFePO₄, alkaline, and energy-harvesting sources without pre-regulation. |
| Overcurrent protection | Foldback current limit (50 mA at RLOAD = 1 Ω) prevents thermal runaway during short-circuit events. |
Applications
| Wearable Health Monitor | Energy-Harvesting Sensor Node |
|---|---|
Use Scenario: Continuous ECG/PPG sensing in smart patch form factor powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Primary 2.8 V power rail regulator for analog front-end and BLE SoC during ultra-low-duty-cycle sampling. Use Value: 250 nA quiescent current extends battery life beyond 3 years; output discharge prevents sensor bias leakage during sleep. | Use Scenario: Solar- or thermal-harvested IoT node transmitting temperature/humidity data every 5 minutes. IC Role / Device Role / Timing Role: Regulator for microcontroller and RF transceiver, activated only during measurement and transmission bursts. Use Value: 10 nA shutdown current preserves harvested energy; 1.0 µF ceramic stability simplifies design in ultra-thin PCBs. |
| Hearing Aid Front-End | Smart Card Power Management |
Use Scenario: Miniature rechargeable hearing aid with analog microphone preamp and digital signal processor. IC Role / Device Role / Timing Role: Low-noise 2.8 V supply for microphone bias and ADC reference, with fast turn-on for voice-triggered wake-up. Use Value: -50 dB PSRR at 1 kHz rejects switching noise from charging IC; 400 µs start-up delay enables responsive voice activation. | Use Scenario: Contactless payment card with embedded secure element and NFC interface. IC Role / Device Role / Timing Role: Regulated 2.8 V supply for secure IC and RF frontend, activated only during field coupling. Use Value: Output discharge ensures no residual voltage remains after NFC field removal - critical for EMV compliance and security. |
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, same 150 mA rating, but in 3-lead SOT-23 package (no SHDN pin, no output discharge) | Lacks shutdown control and discharge - suitable only for always-on, non-sequenced power domains | Select when board space permits larger SOT-23 and system-level power gating is handled externally. |
| Torex XC6210B282MR-G | 2.8 V, 150 mA, 250 nA IQ, but no integrated output discharge; requires external MOSFET for discharge if needed | Higher dropout (500 mV typ. @ 150 mA); no guaranteed discharge path - adds complexity for zero-VOUT sleep | Choose when cost sensitivity outweighs need for integrated discharge and thermal performance is secondary. |
Compared with MCP1811AT-2802E/MB and XC6210B282MR-G, the MCP1811AT-028/LT uniquely combines 2.8 V regulation, 150 mA delivery, 250 nA IQ, and integrated output discharge in a thermally efficient 1×1 mm UDFN - making it the only option that satisfies all four requirements in a single, footprint-optimized device for next-gen ultra-low-power wearables.
Availability
MCP1811AT-028/LT is available at Aetrix Electronics and suitable for energy harvesting, wearable electronics, and medical device applications requiring stable component supply, long-term lifecycle support, and traceable sourcing for ISO 13485-compliant production.
Supply support for MCP1811AT-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 is a leading provider of microcontrollers, analog, FPGA, and timing solutions, serving automotive, industrial, communications, and consumer markets with high-reliability silicon and development tools.
The MCP1811A/B series was designed specifically for ultra-long-life, battery-constrained applications - emphasizing nanoscale quiescent current, ceramic-capacitor compatibility, and integrated power sequencing features like output discharge.
FAQ
What is the maximum input voltage rating for the MCP1811AT-028/LT?
The MCP1811AT-028/LT has an absolute maximum input voltage rating of +6.0 V. Operation above this level risks permanent damage. For reliable continuous operation, the recommended input voltage range is 1.8 V to 5.5 V, with minimum VIN dependent on load current and dropout - e.g., ≥3.2 V required to sustain 150 mA at 2.8 V output.
Does the MCP1811AT-028/LT require an external pull-up resistor on the SHDN pin?
No, the MCP1811AT-028/LT includes an internal pull-up resistor on the SHDN pin. The pin is asserted high by default, enabling regulation. To enter shutdown mode, drive SHDN to GND (logic low); no external pull-up is needed unless specific timing or noise immunity requirements dictate stronger drive strength.
Can the MCP1811AT-028/LT be used with a 0.47 µF output capacitor?
No - the MCP1811AT-028/LT requires a minimum of 1.0 µF ceramic (X7R) output capacitance for guaranteed stability across temperature and load conditions. Using 0.47 µF may cause oscillation or poor transient response, especially under dynamic loads. Always use ≥1.0 µF as specified in DS20006088C, Section 4.2.
What is the thermal resistance (θJA) of the MCP1811AT-028/LT in its UDFN package?
The MCP1811AT-028/LT in the 4-lead 1×1 mm UDFN package has a JEDEC-standard θJA of 91.05°C/W when mounted on a 4-layer FR4 board with 1 oz. copper and thermal vias. This value assumes proper soldering of the exposed thermal pad (EP) to a dedicated PCB thermal plane - omitting EP connection degrades thermal performance significantly.
Is the output voltage of the MCP1811AT-028/LT adjustable via external resistors?
No - the MCP1811AT-028/LT is a fixed-output device with factory-trimmed 2.8 V regulation. It does not support external feedback adjustment. For adjustable output, consider Microchip's MCP1826 or other members of the MCP18xx family with VADJ variants, but note those do not offer equivalent ultra-low IQ or output discharge.
MCP1811AT-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
MCP1811AT-028/LT FAQ
1.How can I place an order for MCP1811AT-028/LT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1811AT-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 MCP1811AT-028/LT reliable?
The price and inventory of MCP1811AT-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 MCP1811AT-028/LT is usually 5 days.
3.What payment methods are accepted for MCP1811AT-028/LT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1811AT-028/LT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1811AT-028/LT?
MCP1811AT-028/LT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1811AT-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 MCP1811AT-028/LT?
For technical support, including MCP1811AT-028/LT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1811AT-028/LT requirements.
6.How does Aetrix verify that MCP1811AT-028/LT is sourced from the original manufacturer or authorized distributors?
All MCP1811AT-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 MCP1811AT-028/LT meets industry standards.
7.What is the process for return or replacement of MCP1811AT-028/LT?
All MCP1811AT-028/LT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1811AT-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 MCP1811AT-028/LT part is unused and in its original packaging.
Return procedure for MCP1811AT-028/LT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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