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Microchip Technology MCP1812BT-040/LB
- Part No.:
- MCP1812BT-040/LB
- Manufacturer:
- Microchip Technology
- Package:
- SC-70, SOT-323
- Datasheet:
-
MCP1812BT-040/LB.pdf
- Description:
- IC REG LINEAR 4V 300MA SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,917
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Product details
Overview
MCP1812BT-040/LB from Microchip Technology is a 300 mA ultra-low-quiescent-current LDO regulator with 4.0 V fixed output, 250 nA typical IQ, and shutdown capability (5 nA typical ISHDN). It operates from 2.4 V to 5.5 V input, supports ceramic output capacitors (≥2.2 µF), and delivers stable low-noise power for battery-constrained wearable and medical devices.
For engineers reviewing the MCP1812BT-040/LB datasheet, MCP1812BT-040/LB pinout, MCP1812BT-040/LB application, or MCP1812BT-040/LB equivalent, key selection criteria include ultra-low shutdown current, 4.0 V output accuracy (±4%), dropout voltage at full load (≤600 mV), thermal performance in 1×1 mm UDFN, and compatibility with energy-harvesting supply rails.
Technical Context
The MCP1812BT-040/LB implements a PMOS pass transistor architecture enabling ultra-low quiescent current and fast start-up (400 µs delay, 200–1000 µs rise time). Its internal error amplifier and overcurrent protection (500–840 mA limit) ensure regulation stability across –40°C to +85°C junction temperature.
It features an integrated discharge transistor (RDCH ≤100 Ω) active only in MCP1812A variants - confirmed absent in MCP1812B series like MCP1812BT-040/LB - and requires no external components beyond input/output ceramic capacitors for full functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 4.0 V ±4% - ensures compatible biasing for 3.3 V/4.0 V logic and analog subsystems without external feedback. |
| Max Output Current | 300 mA continuous - supports higher-power sensors, BLE radios, or MCU wake-up bursts in compact wearables. |
| Quiescent Current | 250 nA typical - enables multi-year operation on coin cells (e.g., CR2032) during deep-sleep modes. |
| Shutdown Current | 5 nA typical - reduces standby drain to negligible levels in energy-harvesting systems with intermittent source availability. |
| Input Voltage Range | 2.4 V to 5.5 V - accommodates single-cell Li-ion (3.0–4.2 V), two-cell alkaline (2.4–3.2 V), and USB-powered inputs. |
| Dropout Voltage | ≤600 mV at 300 mA - maintains regulation down to 4.6 V input when delivering full 4.0 V output. |
| Stability Capacitor | 2.2 µF ceramic (X7R) - enables small-footprint, low-ESR filtering with <170 µVrms output noise (10 Hz–100 kHz). |
Pinout & Package
Package: 4-Lead 1 × 1 mm UDFN with exposed thermal pad (EP) - optimized for space-constrained PCBs and thermal dissipation on 4-layer boards (θJA = 91.05°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply | Accepts 2.4–5.5 V; must be decoupled with ≥1 µF ceramic capacitor near pin for PSRR and transient response. |
| SHDN | Active-low enable/shutdown control | Pulled high internally; driven low (<20% VIN) to enter 5 nA shutdown mode; no external pull-up required. |
| VOUT | Regulated 4.0 V output | Delivers up to 300 mA; requires ≥2.2 µF X7R ceramic capacitor directly at pin for stability and low noise. |
| GND | Ground reference | Low-impedance return path; tie to quiet ground plane or output capacitor cathode to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ (250 nA) | Extends battery life in always-on IoT nodes - e.g., 10 µA average system current yields >10-year runtime on 220 mAh CR2032. |
| 5 nA shutdown current | Enables zero-maintenance operation in solar- or thermal-harvested systems where energy arrives sporadically. |
| Ceramic-capacitor stability | Eliminates need for tantalum or aluminum electrolytics - reduces BOM cost, footprint, and aging-related failure risk. |
| Wide input range (2.4–5.5 V) | Supports direct connection to unregulated energy harvesters (e.g., RF, piezoelectric, thermoelectric sources). |
| –40°C to +85°C operation | Validated for industrial-grade wearable and medical applications including hearing aids and smart patches. |
Applications
| Wearable Health Monitor | Energy-Harvesting Sensor Node |
|---|---|
|
Use Scenario: Continuous ECG/PPG sensing in wrist-worn patch with Bluetooth LE transmission every 5 minutes. IC Role / Device Role / Timing Role: Primary power regulator supplying 4.0 V to analog front-end and BLE SoC during active measurement and radio burst. Use Value: 250 nA quiescent current extends 200 mAh battery life to >3 years; 300 mA peak supports simultaneous ADC sampling and 2.4 GHz transmission. |
Use Scenario: Wireless soil moisture sensor powered by miniature solar cell and supercapacitor buffer. IC Role / Device Role / Timing Role: Stable 4.0 V rail generator that starts reliably at 2.4 V input and shuts down fully between readings. Use Value: 5 nA shutdown current prevents supercapacitor self-discharge dominance; 2.2 µF ceramic capacitor fits micro-size PCB layout. |
| Hearing Aid Audio Processor | Smart Card Power Management |
|
Use Scenario: Miniature rechargeable hearing aid with real-time noise suppression and wireless tuning. IC Role / Device Role / Timing Role: Low-noise 4.0 V supply for MEMS microphone preamp and DSP core during audio processing cycles. Use Value: <170 µVrms output noise avoids audible hiss; 600 mV dropout allows full regulation down to end-of-charge Li-ion voltage (~3.4 V). |
Use Scenario: Contactless payment card with embedded secure element and NFC transceiver. IC Role / Device Role / Timing Role: Regulated 4.0 V source activated only during NFC field presence to power crypto engine and RF interface. Use Value: Fast 400 µs start-up ensures immediate response to reader field; 1×1 mm UDFN package fits within ISO/IEC 7816 card thickness constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6219B402MR-G | 4.0 V fixed output, 300 mA, 1 µA IQ (vs. 250 nA), no shutdown pin | Lacks enable/shutdown control; requires external MOSFET for system-level power gating | Choose when board space permits discrete enable circuitry and ultra-low IQ is secondary to cost. |
| Ricoh RP114K401D-TR-F | 4.0 V fixed output, 300 mA, 250 nA IQ, 10 nA shutdown (vs. 5 nA), SOT-23-5 package | Larger footprint (SOT-23-5 vs. 1×1 mm UDFN); higher thermal resistance (θJA = 211°C/W) | Choose when thermal margin is sufficient and existing layout uses SOT-23 footprints. |
Compared with XC6219B402MR-G and RP114K401D-TR-F, the MCP1812BT-040/LB uniquely combines 5 nA shutdown, 1×1 mm UDFN packaging, and verified 300 mA capability at ultra-low IQ - making it optimal for miniaturized, long-life battery systems where every nanoamp and square millimeter matters.
Availability
MCP1812BT-040/LB is available at Aetrix Electronics and suitable for wearable electronics, medical monitoring devices, and energy-harvesting sensor nodes requiring stable component supply with guaranteed long-term continuity.
Supply support for MCP1812BT-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 is a leading provider of microcontroller, analog, FPGA, and mixed-signal semiconductors headquartered in Chandler, Arizona.
The MCP1811/12 family was designed specifically for ultra-low-power, battery- and energy-harvesting–powered applications - emphasizing nanoscale quiescent current, minimal external components, and robust operation across wide temperature and input ranges.
FAQ
What is the maximum input voltage rating for the MCP1812BT-040/LB?
The MCP1812BT-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 reliable performance only within its 2.4 V to 5.5 V operating input range. Exceeding 6.0 V risks permanent damage per DS20006088C-page 4 Absolute Maximum Ratings.
Does the MCP1812BT-040/LB include an output discharge function during shutdown?
No, the MCP1812BT-040/LB does not include output discharge. Per Table 1 in DS20006088C-page 3, only MCP1812A variants feature the discharge transistor (RDCH ≤100 Ω); MCP1812B variants like MCP1812BT-040/LB omit this function. Output voltage decays naturally through load and parasitic paths after shutdown.
What is the minimum output capacitance required for stability with the MCP1812BT-040/LB?
The MCP1812BT-040/LB requires a minimum 2.2 µF ceramic (X7R) output capacitor for guaranteed stability, as specified in the Features section and Electrical Characteristics table (DS20006088C-page 1 and page 4). Using less than 2.2 µF may cause oscillation or poor transient response, especially under 300 mA load steps.
Can the MCP1812BT-040/LB operate reliably at –40°C ambient temperature?
Yes, the MCP1812BT-040/LB is fully specified and tested for operation across –40°C to +85°C junction temperature (DS20006088C-page 6). Its electrical parameters - including output voltage accuracy, dropout, and quiescent current - remain valid across this range, making it suitable for outdoor and industrial wearable deployments.
Is the 4.0 V output voltage of the MCP1812BT-040/LB adjustable via external resistors?
No, the MCP1812BT-040/LB provides a factory-trimmed fixed 4.0 V output. It belongs to the MCP1812B series, which offers only fixed-voltage options (1.0 V to 4.0 V in 0.2 V increments). Adjustable-output variants are not part of the MCP1811/12 family; design flexibility is achieved via selection among the nine standard fixed voltages.
MCP1812BT-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 @ 300mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 0.5 µA
- Current - Supply (Max):
- 220 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
MCP1812BT-040/LB FAQ
1.How can I place an order for MCP1812BT-040/LB through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1812BT-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 MCP1812BT-040/LB reliable?
The price and inventory of MCP1812BT-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 MCP1812BT-040/LB is usually 5 days.
3.What payment methods are accepted for MCP1812BT-040/LB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1812BT-040/LB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1812BT-040/LB?
MCP1812BT-040/LB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1812BT-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 MCP1812BT-040/LB?
For technical support, including MCP1812BT-040/LB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1812BT-040/LB requirements.
6.How does Aetrix verify that MCP1812BT-040/LB is sourced from the original manufacturer or authorized distributors?
All MCP1812BT-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 MCP1812BT-040/LB meets industry standards.
7.What is the process for return or replacement of MCP1812BT-040/LB?
All MCP1812BT-040/LB units undergo pre-shipment inspection (PSI). If there is an issue with MCP1812BT-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 MCP1812BT-040/LB part is unused and in its original packaging.
Return procedure for MCP1812BT-040/LB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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