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Microchip Technology MCP1812BT-028/LB
- Part No.:
- MCP1812BT-028/LB
- Manufacturer:
- Microchip Technology
- Package:
- SC-70, SOT-323
- Datasheet:
-
MCP1812BT-028/LB.pdf
- Description:
- IC REG LINEAR 2.8V 300MA SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,590
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Product details
Overview
MCP1812BT-028/LB from Microchip Technology is a 300 mA ultra-low quiescent current (250 nA typical) fixed-output 2.8 V low-dropout linear regulator in a 4-lead 1×1 mm UDFN package with exposed thermal pad, designed for energy harvesting and long-life battery-powered systems requiring stable low-noise voltage under microampere load conditions.
For engineers reviewing the MCP1812BT-028/LB datasheet, MCP1812BT-028/LB pinout, MCP1812BT-028/LB application, or MCP1812BT-028/LB equivalent, this page delivers verified electrical specs, thermal performance data, shutdown behavior, ceramic capacitor stability requirements, and real-world use cases in wearable and medical edge devices.
Technical Context
The MCP1812BT-028/LB implements a PMOS pass transistor architecture enabling ultra-low dropout voltage (400 mV typical at 300 mA) and minimal ground current (180–220 µA across full load range). Its internal error amplifier and reference are optimized for operation down to 1.8 V input while maintaining ±4% output accuracy over –40°C to +85°C junction temperature.
It features active output discharge during shutdown (SHDN = GND), delivering fast VOUT ramp-down for system-level power sequencing. The device achieves –50 dB PSRR at 1 kHz without input capacitor and supports dynamic load steps up to 300 mA with sub-100 µs recovery time, validated across multiple output voltages including 2.8 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8 V ±4% - ensures precise biasing for 2.8 V logic rails and analog sensors without external feedback. |
| Max Output Current | 300 mA - supports higher-current peripherals (e.g., BLE radios, display drivers) in compact battery-powered designs. |
| Quiescent Current | 250 nA typical - enables multi-year operation on coin cells or energy harvesters with µA-level sleep budgets. |
| Dropout Voltage | 400 mV typical at 300 mA - allows regulation from 3.2 V input, maximizing usable battery voltage range. |
| Input Voltage Range | 1.8 V to 5.5 V - compatible with single-cell Li-ion, LiFePO₄, alkaline, and supercapacitor sources. |
| Output Capacitor | 2.2 µF ceramic (X7R) - enables small-footprint, low-ESR, low-noise filtering without tantalum or electrolytic parts. |
| Shutdown Current | 5 nA typical - reduces system standby leakage to negligible levels during deep-sleep modes. |
Pinout & Package
Package: 4-Lead 1×1 mm UDFN with exposed thermal pad (EP), JEDEC-standard footprint optimized for thermal dissipation on 4-layer FR4 boards with thermal vias (θJA = 91.05°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply | Accepts 1.8–5.5 V; requires local 1 µF ceramic bypass; connects to high-side power rail before LDO. |
| SHDN | Active-low enable control | Pulled high internally; driven low to enter 5 nA shutdown mode with active output discharge. |
| VOUT | Regulated output | Delivers stable 2.8 V; requires 2.2 µF X7R ceramic capacitor to ground for stability and noise suppression. |
| GND | Ground reference | Low-impedance return path; must connect directly to output capacitor ground and thermal pad for optimal PSRR. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ (250 nA) | Enables >10-year battery life in devices drawing <1 µA average current during sleep cycles. |
| Output discharge on shutdown | Drives VOUT to GND via internal 100 Ω transistor, eliminating hold-up voltage that could delay system reset. |
| Stable with 2.2 µF ceramic cap | Reduces BOM cost and board area vs. larger tantalum caps; lowers output noise to 169–266 µVrms (10 Hz–100 kHz). |
| Wide input range (1.8–5.5 V) | Supports direct connection to partially discharged batteries or variable-energy harvesters without pre-regulation. |
| Thermally enhanced UDFN | Exposed pad enables 285.89°C/W junction-to-case top thermal resistance, critical for sustained 300 mA operation in confined spaces. |
Applications
| Wearable Health Monitor | Energy-Harvesting Sensor Node |
|---|---|
|
Use Scenario: Continuous ECG/PPG sensing powered by thin-film battery or thermoelectric harvester. IC Role / Device Role / Timing Role: Primary 2.8 V supply for ultra-low-power MCU and analog front-end. Use Value: 250 nA quiescent current extends sensor node lifetime beyond 5 years on a CR2032; 2.2 µF ceramic cap minimizes size in wrist-worn form factor. |
Use Scenario: Wireless soil moisture/temperature node powered by solar cell + supercapacitor. IC Role / Device Role / Timing Role: Regulated 2.8 V source enabling reliable ADC sampling and BLE transmission bursts. Use Value: 1.8 V minimum input allows operation during low-light conditions; 300 mA peak current supports concurrent RF + sensor actuation. |
| Hearing Aid Processor | Smart Card Controller |
|
Use Scenario: Miniaturized digital hearing aid with adaptive noise cancellation and Bluetooth LE streaming. IC Role / Device Role / Timing Role: Low-noise 2.8 V rail for audio codec and DSP core. Use Value: 169 µVrms output noise prevents audible hiss; 400 mV dropout preserves battery runtime down to 3.2 V. |
Use Scenario: Contactless payment card with embedded secure element and NFC transceiver. IC Role / Device Role / Timing Role: Standby power regulator activated only during RF field coupling. Use Value: 5 nA shutdown current prevents measurable battery drain between transactions; fast 400 µs startup ensures responsive card detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1812-2802E/MB | Same 2.8 V output, 300 mA rating, and 250 nA IQ, but in 5-lead SOT-23 package with NC pin instead of UDFN EP. | Larger footprint and higher θJA (184.82°C/W); less suitable for space-constrained wearables but easier hand-soldering. | Select when thermal vias are impractical or manual assembly is required; verify PCB layout accommodates 5-pin SOT-23. |
| Torex XC6210B282MR-G | 2.8 V, 300 mA, 250 nA IQ, but no output discharge; requires external discharge circuit for fast VOUT decay. | Higher shutdown leakage (~100 nA) and no integrated RDCH limits use in strict power-sequencing systems. | Choose where output discharge is unnecessary and cost sensitivity outweighs functional completeness. |
Compared with MCP1812BT-028/LB, the SOT-23 alternative trades thermal performance and miniaturization for assembly flexibility, while the Torex part omits critical discharge functionality-making MCP1812BT-028/LB the sole choice for applications demanding both ultra-low IQ and controlled shutdown behavior in smallest possible footprint.
Availability
MCP1812BT-028/LB is available at Aetrix Electronics and suitable for energy harvesting nodes, wearable health monitors, and smart card controllers requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MCP1812BT-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 Inc. is a leading provider of microcontroller, mixed-signal, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with high-reliability silicon and development tools.
The MCP1812BT-028/LB belongs to Microchip's ultra-low-power LDO family, engineered specifically for battery- and harvester-powered edge devices where nanowatt quiescent current and ceramic-capacitor stability are mandatory design constraints.
FAQ
What is the maximum continuous output current of the MCP1812BT-028/LB?
The MCP1812BT-028/LB delivers up to 300 mA of continuous output current while maintaining regulation and thermal safety under specified ambient conditions. This rating is validated across the full operating temperature range (–40°C to +85°C) and is supported by its PMOS pass element and thermal design in the 1×1 mm UDFN package.
Does the MCP1812BT-028/LB require an external output capacitor, and if so, what type and value?
Yes, the MCP1812BT-028/LB requires a minimum 2.2 µF ceramic (X7R) output capacitor connected between VOUT and GND for stability and noise reduction. This value is explicitly specified in the datasheet and enables low-ESR performance without needing larger or more expensive tantalum or aluminum electrolytic capacitors.
How does the MCP1812BT-028/LB behave during shutdown, and what is its shutdown current?
When SHDN is pulled low, the MCP1812BT-028/LB enters shutdown mode with typical supply current of 5 nA and actively discharges VOUT to GND through an internal 100 Ω transistor. This ensures rapid, controlled ramp-down of the output voltage-critical for clean power sequencing in multi-rail systems.
What is the dropout voltage specification for the MCP1812BT-028/LB at full load?
At 300 mA output current and +25°C, the MCP1812BT-028/LB exhibits a typical dropout voltage of 400 mV, defined as the VIN–VOUT differential at which output drops 2% below nominal 2.8 V. This allows regulation from as low as 3.2 V input, extending usable battery life in single-cell systems.
Is the MCP1812BT-028/LB compatible with standard PCB assembly processes, including reflow soldering?
Yes, the MCP1812BT-028/LB in its 4-lead 1×1 mm UDFN package is fully compatible with industry-standard lead-free reflow profiles (J-STD-020). Its exposed thermal pad requires appropriate stencil design and solder paste volume to ensure reliable thermal and electrical connection to the PCB ground plane.
MCP1812BT-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 @ 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-028/LB FAQ
1.How can I place an order for MCP1812BT-028/LB through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1812BT-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 MCP1812BT-028/LB reliable?
The price and inventory of MCP1812BT-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 MCP1812BT-028/LB is usually 5 days.
3.What payment methods are accepted for MCP1812BT-028/LB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1812BT-028/LB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1812BT-028/LB?
MCP1812BT-028/LB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1812BT-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 MCP1812BT-028/LB?
For technical support, including MCP1812BT-028/LB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1812BT-028/LB requirements.
6.How does Aetrix verify that MCP1812BT-028/LB is sourced from the original manufacturer or authorized distributors?
All MCP1812BT-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 MCP1812BT-028/LB meets industry standards.
7.What is the process for return or replacement of MCP1812BT-028/LB?
All MCP1812BT-028/LB units undergo pre-shipment inspection (PSI). If there is an issue with MCP1812BT-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 MCP1812BT-028/LB part is unused and in its original packaging.
Return procedure for MCP1812BT-028/LB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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