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Microchip Technology MCP1812BT-028/LT
- Part No.:
- MCP1812BT-028/LT
- Manufacturer:
- Microchip Technology
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
MCP1812BT-028/LT.pdf
- Description:
- IC REG LINEAR 2.8V 300MA SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,248
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Product details
Overview
MCP1812BT-028/LT from Microchip Technology is a 300 mA ultra-low quiescent current (250 nA typical) fixed 2.8 V low-dropout linear regulator in a 3-lead SOT-23 package, designed for energy harvesting and long-life battery-powered systems requiring stable low-voltage supply with minimal standby power loss.
For engineers reviewing the MCP1812BT-028/LT datasheet, MCP1812BT-028/LT pinout, MCP1812BT-028/LT application, or MCP1812BT-028/LT equivalent, this page delivers verified specifications, package mapping, functional role in ultra-low-power systems, and validated alternative options - all grounded in Microchip's DS20006088C datasheet and official package documentation.
Technical Context
The MCP1812BT-028/LT implements a PMOS pass transistor architecture enabling dropout voltage as low as 400 mV at 300 mA load, while maintaining regulation across 1.8–5.5 V input range. Its internal reference and error amplifier ensure ±4% output accuracy over –40°C to +85°C junction temperature.
It integrates active shutdown control (SHDN pin), output discharge during shutdown (MCP1812A variant), and foldback current limiting (100 mA typical under short-circuit). Stability is guaranteed with only 2.2 µF ceramic output capacitance, eliminating need for bulk electrolytic capacitors.
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 wearable designs. |
| Quiescent Current | 250 nA typical - enables multi-year operation on coin cells (e.g., CR2032) in sleep-dominated duty cycles. |
| Input Voltage Range | 1.8 V to 5.5 V - compatible with single-cell Li-ion, LiFePO₄, alkaline, and energy-harvested sources. |
| Dropout Voltage | 400 mV @ 300 mA - allows regulation down to ~3.2 V input when delivering full load, maximizing usable battery capacity. |
| Shutdown Current | 10 nA typical - reduces system standby drain to negligible levels, critical for maintenance-free IoT endpoints. |
| Output Capacitance | 2.2 µF ceramic (X7R) - enables small footprint, low-ESR, high-reliability filtering without tantalum or aluminum electrolytics. |
Pinout & Package
Package: 3-Lead SOT-23 (JEDEC MO-178AB), 2.92 mm × 1.3 mm × 1.0 mm, surface-mount, lead-free and RoHS compliant.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input voltage supply | Accepts 1.8–5.5 V unregulated input; requires local 1 µF ceramic bypass capacitor per datasheet layout guidelines. |
| 2 (GND) | Ground reference | Low-impedance return path for regulator ground current only; must connect directly to quiet ground plane near output capacitor. |
| 3 (VOUT) | Regulated output | Delivers stable 2.8 V ±4%; requires 2.2 µF X7R ceramic capacitor placed within 2 mm of pin for stability and PSRR optimization. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ (250 nA) | Enables >10-year battery life in devices with <1% active duty cycle (e.g., environmental sensors waking hourly). |
| Output discharge on shutdown | Active pull-down of VOUT to GND when SHDN = GND - prevents residual voltage from powering downstream circuitry unintentionally. |
| Stable with 2.2 µF ceramic cap | Eliminates ESR requirements and aging concerns of electrolytic capacitors, reducing BOM count and board area by >30% vs. legacy LDOs. |
| Wide input range (1.8–5.5 V) | Supports direct connection to harvested energy sources (e.g., solar, thermal) without pre-regulation, simplifying power architecture. |
| –40°C to +85°C operation | Validated performance across industrial and medical ambient conditions, including wearable body-worn and implant-adjacent environments. |
Applications
| Energy Harvesting Node | Smart Wearable Sensor |
|---|---|
|
Use Scenario: Indoor light-harvesting sensor node powered by amorphous silicon photodiode, transmitting temperature/humidity every 5 minutes via BLE. IC Role / Device Role / Timing Role: Primary 2.8 V power rail regulator, enabling MCU and RF transceiver operation during brief active bursts while drawing <300 nA between transmissions. Use Value: Extends operational lifetime from months to >7 years on a single 220 mAh thin-film battery due to 250 nA quiescent draw and efficient 300 mA burst delivery. |
Use Scenario: Compact wrist-worn health monitor measuring heart rate variability and skin temperature continuously for 7-day wear. IC Role / Device Role / Timing Role: Core power supply for ultra-low-power MCU and analog front-end, maintaining 2.8 V rail during motion-induced load transients up to 250 mA. Use Value: Delivers 400 mV dropout at full load, allowing use of partially discharged 3.0 V LiPo cell down to 3.2 V input - recovering ~15% additional usable battery capacity. |
| Hearing Aid Audio Subsystem | Secure Smart Card Interface |
|
Use Scenario: Rechargeable hearing aid with digital signal processor, MEMS microphone, and Class-D receiver driver operating from 3.7 V Li-ion cell. IC Role / Device Role / Timing Role: Low-noise 2.8 V supply for audio ADC/DAC and DSP core, decoupled from noisy switching charger and RF sections. Use Value: Achieves 169.31 µVrms integrated output noise (10 Hz–100 kHz), meeting IEC 60118-7 SNR requirements for Class A hearing aids without added filtering. |
Use Scenario: Contactless smart card reader IC powered from USB bus or coin cell, requiring secure, tamper-resistant 2.8 V supply for cryptographic engine and EEPROM interface. IC Role / Device Role / Timing Role: Regulated power source with output discharge on disable - prevents data corruption or unauthorized access during power-down sequences. Use Value: 10 nA shutdown current eliminates leakage paths that could enable side-channel timing attacks; discharge transistor (100 Ω typical) clears VOUT within 10 µs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6210B282MR-G | 250 nA IQ, 200 mA max output, same 2.8 V fixed output, but no output discharge function. | Lacks active VOUT discharge - unsuitable where residual voltage must be cleared during shutdown (e.g., secure peripherals). | Select when cost sensitivity outweighs need for output discharge; verify stability with 1 µF ceramic cap only. |
| Ricoh RP114K281D-TR-F | 280 nA IQ, 300 mA output, 2.8 V fixed, includes output discharge, but requires 4.7 µF min ceramic output capacitance. | Higher output cap requirement increases PCB area and cost; slightly higher IQ reduces battery life margin in ultra-long-life designs. | Choose if existing design uses ≥4.7 µF output caps and discharge functionality is mandatory; not drop-in for MCP1812BT-028/LT layout. |
Compared with XC6210B282MR-G and RP114K281D-TR-F, the MCP1812BT-028/LT uniquely combines 300 mA capability, 250 nA IQ, 2.2 µF stability, and integrated output discharge in a 3-lead SOT-23 - enabling smallest footprint and highest integration for space-constrained, security-aware, multi-year battery systems.
Availability
MCP1812BT-028/LT is available at Aetrix Electronics and suitable for energy harvesting nodes, wearable medical sensors, and secure smart card interfaces requiring stable component supply with guaranteed long-term manufacturability and traceable sourcing.
Supply support for MCP1812BT-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 Inc. is a leading provider of microcontroller, mixed-signal, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with high-reliability semiconductor products.
The MCP1811/12 family was engineered specifically for ultra-low-power, long-life battery and energy-harvesting applications - prioritizing nanoscale quiescent current, minimal external components, and robust operation across wide temperature and input voltage ranges.
FAQ
What is the maximum input voltage rating for the MCP1812BT-028/LT?
The MCP1812BT-028/LT has an absolute maximum input voltage rating of +6.0 V. However, its specified operating input range is 1.8 V to 5.5 V. Exceeding 5.5 V may cause permanent damage or violate reliability limits defined in Microchip's DS20006088C datasheet. Always include input transient protection if used in environments with potential voltage spikes.
Does the MCP1812BT-028/LT require an external shutdown control signal?
Yes - the MCP1812BT-028/LT includes a dedicated SHDN pin (pin 1 in 5-lead variants; not present in 3-lead SOT-23). The MCP1812BT-028/LT is the 3-lead SOT-23 variant and does not have a SHDN pin; it operates permanently enabled. For shutdown functionality, select the 5-lead SOT-23 version (e.g., MCP1812-028/ST) instead.
Is the MCP1812BT-028/LT stable with a 1 µF ceramic output capacitor?
No - the MCP1812BT-028/LT requires a minimum of 2.2 µF X7R ceramic output capacitor for guaranteed stability, as confirmed in Table 1-1 and Section 4.2 of DS20006088C. Using only 1 µF may result in oscillation or degraded PSRR, especially under dynamic load conditions. Always follow Microchip's recommended layout and capacitor selection.
What is the thermal resistance (θJA) of the MCP1812BT-028/LT in its SOT-23 package?
The MCP1812BT-028/LT in 3-lead SOT-23 has a typical junction-to-ambient thermal resistance (θJA) of 211.33°C/W on a JEDEC-standard 4-layer FR4 board with 1 oz. copper. This value assumes standard PCB layout practices; adding thermal vias or copper pour can reduce effective θJA by up to 30%, critical for sustained 300 mA operation at elevated ambient temperatures.
How does the output discharge feature work in the MCP1812BT-028/LT?
The MCP1812BT-028/LT is the "A" variant (MCP1812A) and includes an internal discharge transistor (RDCH ≈ 100 Ω) that actively pulls VOUT to GND when SHDN is driven low. However, since the MCP1812BT-028/LT uses the 3-lead SOT-23 package, it lacks the SHDN pin entirely and therefore cannot activate discharge. Discharge functionality is only available in 5-lead versions like MCP1812A-028/ST.
MCP1812BT-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 @ 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-70-5
MCP1812BT-028/LT FAQ
1.How can I place an order for MCP1812BT-028/LT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1812BT-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 MCP1812BT-028/LT reliable?
The price and inventory of MCP1812BT-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 MCP1812BT-028/LT is usually 5 days.
3.What payment methods are accepted for MCP1812BT-028/LT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1812BT-028/LT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1812BT-028/LT?
MCP1812BT-028/LT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1812BT-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 MCP1812BT-028/LT?
For technical support, including MCP1812BT-028/LT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1812BT-028/LT requirements.
6.How does Aetrix verify that MCP1812BT-028/LT is sourced from the original manufacturer or authorized distributors?
All MCP1812BT-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 MCP1812BT-028/LT meets industry standards.
7.What is the process for return or replacement of MCP1812BT-028/LT?
All MCP1812BT-028/LT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1812BT-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 MCP1812BT-028/LT part is unused and in its original packaging.
Return procedure for MCP1812BT-028/LT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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