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Microchip Technology MCP1811AT-010/LT
- Part No.:
- MCP1811AT-010/LT
- Manufacturer:
- Microchip Technology
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
MCP1811AT-010/LT.pdf
- Description:
- IC REG LINEAR 1V 150MA SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,671
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Product details
Overview
MCP1811AT-010/LT from Microchip Technology is a 150 mA ultra-low-quiescent-current LDO linear regulator with fixed 1.0 V output, 250 nA typical operating current, and output discharge functionality (MCP1811A variant). It operates from 1.8 V to 5.5 V input and is stable with a 1.0 µF ceramic output capacitor. Designed for energy harvesting and long-life battery-powered systems such as hearing aids and smart wearables.
For engineers reviewing the MCP1811AT-010/LT datasheet, MCP1811AT-010/LT pinout, MCP1811AT-010/LT application, or MCP1811AT-010/LT equivalent, this page delivers verified electrical specs, package mapping to 4-lead 1×1 mm UDFN, functional role in ultra-low-power supply rails, and validated alternative options for design flexibility.
Technical Context
The MCP1811AT-010/LT implements a low-dropout architecture with internal PMOS pass transistor and error amplifier, enabling regulation down to 400 mV dropout at 150 mA load. Its shutdown logic accepts TTL-compatible control (VSHDN-HIGH ≥ 70% VIN) and activates an integrated discharge transistor (RDCH = 100 Ω) to rapidly deplete VOUT when SHDN = GND.
It features overcurrent protection with foldback limiting (50 mA at RLOAD = 1 Ω), ±25 mV load regulation across 1–150 mA, and -50 dB PSRR at 1 kHz with no input capacitor - optimized for noise-sensitive microcontroller and sensor supply domains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.0 V ±4% - ensures precise biasing for 1.0 V core logic and low-voltage RF ICs. |
| Max Output Current | 150 mA continuous - supports moderate-current peripherals (e.g., BLE SoCs, ADCs) without thermal derating on standard PCBs. |
| Quiescent Current | 250 nA typical - enables multi-year operation on coin cells (e.g., CR2032) in sleep-dominated duty cycles. |
| Shutdown Current | 10 nA typical - reduces system standby leakage to sub-nA levels when paired with external wake-up controllers. |
| Dropout Voltage | 400 mV max at 150 mA - allows operation from partially discharged batteries (e.g., 1.4 V Li-SOCl₂) while maintaining regulation. |
| Stability Capacitor | 1.0 µF ceramic (X7R) - eliminates need for bulky tantalum or electrolytic capacitors, reducing BOM cost and board area. |
| PSRR @ 1 kHz | -50 dB (no CIN) - suppresses switching noise from adjacent DC/DC converters without requiring input filtering. |
Pinout & Package
Package: 4-Lead 1 × 1 mm UDFN with exposed thermal pad (EP) - optimized for space-constrained wearable and medical PCBs; thermal resistance 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; must be decoupled locally with ≥1 µF ceramic to ensure stability and transient response. |
| SHDN | Active-low enable/discharge control | Pull high (>1.4 V) to enable; tie to GND to disable and activate output discharge path (DT). |
| VOUT | Regulated output | Delivers fixed 1.0 V; requires ≥1.0 µF X7R ceramic capacitor placed <1 mm from pin for loop stability. |
| GND | Ground reference | Low-impedance return for error amp and pass device; connect directly to quiet ground plane near output cap. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ (250 nA) | Extends battery life in intermittent-sensing applications (e.g., environmental monitors logging every 10 min). |
| Integrated output discharge | Drains VOUT within microseconds after shutdown - prevents back-powering of downstream circuitry and enables clean power sequencing. |
| Ceramic-capacitor stability | Eliminates ESR requirements and simplifies layout; compatible with 0402/0603 MLCCs for miniaturized designs. |
| Overcurrent foldback | Limits fault current to 50 mA during short-circuit - protects both regulator and battery under sustained overload. |
| Wide input range (1.8–5.5 V) | Supports single-cell Li-ion, Li-SOCl₂, alkaline, and NiMH sources without intermediate buck conversion. |
Applications
| Energy Harvesting Node | Medical Hearing Aid |
|---|---|
Use Scenario: Indoor light-harvesting system powering a wireless sensor node with intermittent RF transmission. IC Role / Device Role / Timing Role: Primary supply regulator for ultra-low-power MCU and sub-GHz transceiver during active bursts. Use Value: 250 nA quiescent current minimizes drain during 99.9% sleep time; 1.0 V output matches core voltage of ARM Cortex-M0+ MCUs. |
Use Scenario: Rechargeable hearing aid using a 3.7 V Li-ion cell with multi-week runtime between charges. IC Role / Device Role / Timing Role: Main rail regulator for analog front-end and digital signal processor, enabled only during audio processing. Use Value: Output discharge clears residual charge before deep-sleep mode, preventing audible pop artifacts during wake-up. |
| Smart Wearable Watch | Industrial Wireless Sensor |
Use Scenario: Fitness tracker with optical heart-rate sensor and Bluetooth LE, powered by a 120 mAh coin cell. IC Role / Device Role / Timing Role: Dedicated 1.0 V supply for sensor interface ASIC during measurement windows. Use Value: 10 nA shutdown current extends shelf life beyond 5 years; 400 mV dropout enables full utilization of battery voltage range. |
Use Scenario: Remote temperature/humidity sensor deployed in unattended locations with 10-year battery target. IC Role / Device Role / Timing Role: Regulator for low-power microcontroller and LoRa transceiver in periodic wake-and-report cycle. Use Value: Ceramic-capacitor compatibility reduces component count and improves reliability vs. electrolytic alternatives in wide-temperature environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-1002E/MB | Same 1.0 V output, 250 nA IQ, but no output discharge; SOT-23-3 package (no SHDN pin). | Suitable where shutdown control is handled externally or not required; lacks fast VOUT discharge capability. | Select when board space is constrained and discharge is unnecessary - saves one PCB trace and routing layer. |
| TPL7407LPGEDR | 150 mA, 1.0 V, 350 nA IQ, no discharge; 6-pin WSON with integrated 7-channel high-side driver (non-LDO function). | Not a direct LDO replacement - includes driver functionality; higher IQ and different pinout/functionality. | Consider only if system requires integrated drivers alongside regulation; otherwise, IQ and feature mismatch reduce suitability. |
Compared with MCP1700T-1002E/MB, the MCP1811AT-010/LT adds critical output discharge for clean power sequencing, while TPL7407LPGEDR introduces unrelated driver functions that complicate substitution without redesign.
Availability
MCP1811AT-010/LT is available at Aetrix Electronics and suitable for energy harvesting nodes, medical hearing aids, and smart wearable watches requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MCP1811AT-010/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 microcontrollers, analog, and Flash-IP solutions, serving automotive, industrial, and consumer markets with high-reliability silicon and development tools.
The MCP1811A/B family targets ultra-low-power battery-operated systems, emphasizing nanoscale quiescent current, ceramic-capacitor compatibility, and integrated discharge - specifically engineered for multi-year deployments in sensing and portable medical devices.
FAQ
What is the output voltage tolerance of the MCP1811AT-010/LT?
The MCP1811AT-010/LT provides a fixed 1.0 V output with ±4% tolerance across temperature (-40°C to +85°C) and load (0–150 mA). This specification ensures reliable operation of 1.0 V core logic in microcontrollers and sensors without requiring external feedback trimming.
Does the MCP1811AT-010/LT require an input capacitor?
No, the MCP1811AT-010/LT is specified to operate stably without an input capacitor - PSRR testing confirms -50 dB rejection at 1 kHz even with CIN = 0 µF. However, a local 1 µF ceramic capacitor on VIN is recommended to suppress high-frequency noise from upstream sources.
How does the output discharge function work in the MCP1811AT-010/LT?
When SHDN is pulled low, the MCP1811AT-010/LT activates an internal discharge transistor (RDCH = 100 Ω) between VOUT and GND. This discharges the output capacitor rapidly - typically within tens of microseconds - preventing back-powering of downstream circuitry and enabling deterministic power-down sequencing.
What is the minimum input voltage required for regulation at full load?
At 150 mA output, the MCP1811AT-010/LT requires VIN ≥ 1.4 V to maintain regulation (1.0 V + 400 mV dropout). The datasheet specifies a minimum operating VIN of 1.8 V across all loads, ensuring margin for line and load transients while guaranteeing performance over temperature.
Which package variant does MCP1811AT-010/LT use, and what are its thermal characteristics?
The MCP1811AT-010/LT uses the 4-lead 1 × 1 mm UDFN package with exposed thermal pad. On a JEDEC-standard 4-layer FR4 board, it achieves θJA = 91.05°C/W and θJC(Top) = 285.89°C/W - enabling 150 mA operation without heatsinking in ambient temperatures up to +85°C.
MCP1811AT-010/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):
- 1V
- 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-010/LT FAQ
1.How can I place an order for MCP1811AT-010/LT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1811AT-010/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-010/LT reliable?
The price and inventory of MCP1811AT-010/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-010/LT is usually 5 days.
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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1811AT-010/LT transactions.
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4.How is shipping managed for MCP1811AT-010/LT?
MCP1811AT-010/LT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1811AT-010/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-010/LT?
For technical support, including MCP1811AT-010/LT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1811AT-010/LT requirements.
6.How does Aetrix verify that MCP1811AT-010/LT is sourced from the original manufacturer or authorized distributors?
All MCP1811AT-010/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-010/LT meets industry standards.
7.What is the process for return or replacement of MCP1811AT-010/LT?
All MCP1811AT-010/LT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1811AT-010/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-010/LT part is unused and in its original packaging.
Return procedure for MCP1811AT-010/LT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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