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Microchip Technology MCP1812AT-028/OT
- Part No.:
- MCP1812AT-028/OT
- Manufacturer:
- Microchip Technology
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MCP1812AT-028/OT.pdf
- Description:
- IC REG LINEAR 2.8V 300MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,438
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Product details
Overview
MCP1812AT-028/OT from Microchip Technology is a 300 mA ultra-low-quiescent-current LDO regulator with fixed 2.8 V output, 250 nA typical IQ, and stable operation with 2.2 µF ceramic output capacitor. It features output discharge during shutdown (MCP1812A variant), overcurrent protection, and operates across 1.8–5.5 V input for battery-powered wearable sensors and medical hearing aids.
For engineers reviewing the MCP1812AT-028/OT datasheet, MCP1812AT-028/OT pinout, MCP1812AT-028/OT application, or MCP1812AT-028/OT equivalent, key selection criteria include shutdown current (10 nA typ), dropout voltage at full load (600 mV max), thermal resistance in SOT-23 (211.33°C/W), and compatibility with micro-power MCUs in energy-harvesting systems.
Technical Context
The MCP1812AT-028/OT implements a PMOS pass transistor architecture enabling ultra-low quiescent current without sacrificing transient response. Its internal error amplifier and feedback network maintain ±4% output voltage accuracy over –40°C to +85°C junction temperature and load currents up to 300 mA.
Shutdown is controlled via an active-low SHDN pin with 20% VIN logic-low threshold; when asserted, the device enables output discharge through an integrated 100 Ω discharge transistor and reduces supply current to 10 nA typical-critical for long-life battery systems requiring deep sleep states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8 V ±4% - ensures stable bias for 2.8 V I/O domains in ultra-low-power MCUs |
| Max Output Current | 300 mA - supports higher-current peripherals (e.g., BLE radios, OLED drivers) without external boost |
| Quiescent Current | 250 nA typical - enables multi-year operation on coin cells in always-on sensor nodes |
| Shutdown Current | 10 nA typical - minimizes leakage during system hibernation, preserving >99.9% of battery capacity over months |
| Dropout Voltage | 600 mV max at 300 mA - allows regulation down to 3.4 V input, extending usable battery range in 3.7 V Li-ion systems |
| Stability Capacitor | 2.2 µF ceramic (X7R) - enables compact, low-ESR, low-noise filtering without tantalum or electrolytic components |
| PSRR | –50 dB at 1 kHz - suppresses switching noise from adjacent DC/DC converters in mixed-signal PCBs |
Pinout & Package
Package: 3-Lead SOT-23 - surface-mount, low-profile (1.3 mm height), JEDEC-standard footprint compatible with automated assembly and thermal vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply | Accepts 1.8–5.5 V; requires local 1 µF ceramic bypass near pin to suppress high-frequency noise |
| VOUT | Regulated output | Delivers 2.8 V ±4%; must connect ≥2.2 µF X7R ceramic capacitor directly to GND for stability |
| GND | Ground reference | Low-impedance return path for load and quiescent current; tie to quiet ground plane under IC body |
Key Features
| Feature | Design Value |
|---|---|
| Output discharge on shutdown | Active 100 Ω discharge path pulls VOUT to GND within microseconds-prevents floating rail during MCU reset sequences |
| Ultra-low IQ architecture | 250 nA operating current enables >10-year runtime on CR2032 (220 mAh) at 1 µA average system load |
| Ceramic-capacitor stability | Validated with 2.2 µF X7R ceramics-eliminates ESR requirements and simplifies BOM vs. older LDOs needing tantalum |
| Overcurrent foldback | 100 mA foldback limit at RLOAD = 1 Ω prevents thermal runaway during short-circuit events |
| Wide input range | 1.8–5.5 V operation supports single-cell Li-ion, NiMH, alkaline, and energy-harvesting sources without pre-regulation |
Applications
| Energy Harvesting Sensor Node | Smart Hearing Aid |
|---|---|
Use Scenario: Indoor light-harvesting node powering a sub-GHz RF transceiver and MEMS accelerometer. IC Role / Device Role / Timing Role: Primary power regulator supplying 2.8 V to RF SoC and sensor interface during intermittent wake cycles. Use Value: 250 nA IQ extends harvestable energy window; 2.2 µF ceramic capacitor enables miniaturized PCB area (<3 mm²). | Use Scenario: Rechargeable hearing aid using 3.7 V Li-ion battery with multi-week runtime requirement. IC Role / Device Role / Timing Role: Main LDO delivering regulated 2.8 V to DSP, microphone preamp, and receiver amplifier. Use Value: 10 nA shutdown current preserves battery during nightly storage; 600 mV dropout sustains operation until 3.4 V cell voltage. |
| Wearable Fitness Tracker | Implantable Medical Monitor |
Use Scenario: Wrist-worn tracker with optical heart-rate sensor, BLE radio, and OLED display. IC Role / Device Role / Timing Role: System LDO providing clean 2.8 V rail for analog front-end and digital core during motion-triggered sampling bursts. Use Value: –50 dB PSRR at 1 kHz rejects switching noise from display driver; output discharge prevents latch-up during rapid mode transitions. | Use Scenario: Subcutaneous glucose monitor with 10-year battery life target and strict leakage limits. IC Role / Device Role / Timing Role: Safety-critical power regulator for analog sensor signal chain and ultra-low-power MCU. Use Value: Guaranteed 250 nA IQ (not typical only) per datasheet spec ensures predictable end-of-life voltage margin; 4 kV HBM ESD rating enhances reliability in sterilized assemblies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1812AT-2802E/OT | Same 2.8 V output, same 300 mA rating, but SC70-3 package (smaller footprint, higher θJA = 300.6°C/W) | Preferred for space-constrained designs where thermal budget allows higher junction rise | Select when board area <1.6 mm² is critical and ambient temperature remains <60°C |
| Torex XC6210B282MR-G | 2.8 V, 300 mA, 250 nA IQ, but no output discharge; shutdown current 50 nA (vs. 10 nA) | Suitable for non-critical systems where VOUT float during shutdown is acceptable | Choose when cost sensitivity outweighs need for active discharge and lowest shutdown IQ |
Compared with MCP1812AT-2802E/OT, the MCP1812AT-028/OT offers lower thermal resistance in SOT-23 for better power dissipation handling; versus XC6210B282MR-G, it delivers superior shutdown leakage control and integrated discharge-key for medical and energy-harvesting use cases demanding zero residual rail charge.
Availability
MCP1812AT-028/OT is available at Aetrix Electronics and suitable for energy harvesting sensor nodes, wearable fitness trackers, and implantable medical monitors requiring stable component supply with guaranteed long-term manufacturability.
Supply support for MCP1812AT-028/OT 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 global semiconductor company specializing in microcontrollers, analog devices, and timing solutions for embedded control applications.
The MCP1811/1812 family was designed specifically for ultra-low-power, battery-critical systems-emphasizing nanoscale quiescent current, ceramic-capacitor compatibility, and robust shutdown behavior in wearables and medical electronics.
FAQ
What is the maximum input voltage rating for the MCP1812AT-028/OT?
The MCP1812AT-028/OT has an absolute maximum input voltage rating of +6.0 V. Operation beyond 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: ≥2.4 V at 300 mA output to maintain regulation.
Does the MCP1812AT-028/OT require an external resistor divider to set output voltage?
No. The MCP1812AT-028/OT is a fixed-output LDO with factory-trimmed 2.8 V regulation. It does not support adjustable output via external resistors. The "028" in the part number explicitly denotes the 2.8 V version; alternative voltages (e.g., 1.8 V, 3.3 V) are separate orderable SKUs.
Can the MCP1812AT-028/OT be used with a 1 µF output capacitor?
No. The MCP1812AT-028/OT requires a minimum 2.2 µF ceramic (X7R) output capacitor for stability, as confirmed in DS20006088C-page 1. Using 1 µF-as permitted for the 150 mA MCP1811X series-will cause oscillation and output voltage instability under load.
Is the MCP1812AT-028/OT pin-compatible with other members of the MCP1811/12 family?
Yes, in identical packages. The MCP1812AT-028/OT in SOT-23 shares identical pinout (VIN–VOUT–GND) with all 3-lead variants of the MCP1811A/B and MCP1812A/B families. However, functional differences exist-e.g., only MCP1812A variants (like this part) include output discharge; MCP1812B variants omit it.
What is the thermal resistance (θJA) of the MCP1812AT-028/OT in its SOT-23 package?
The MCP1812AT-028/OT in 3-Lead SOT-23 has a thermal resistance θJA of 211.33°C/W when mounted on a JEDEC-standard 4-layer FR4 board with 1 oz. copper. This value assumes standard layout practices; adding thermal vias under the pad can reduce effective θJA by up to 30%.
MCP1812AT-028/OT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- 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:
- SOT-23-5
MCP1812AT-028/OT FAQ
1.How can I place an order for MCP1812AT-028/OT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1812AT-028/OT 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 MCP1812AT-028/OT reliable?
The price and inventory of MCP1812AT-028/OT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1812AT-028/OT is usually 5 days.
3.What payment methods are accepted for MCP1812AT-028/OT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1812AT-028/OT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1812AT-028/OT?
MCP1812AT-028/OT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1812AT-028/OT 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 MCP1812AT-028/OT?
For technical support, including MCP1812AT-028/OT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1812AT-028/OT requirements.
6.How does Aetrix verify that MCP1812AT-028/OT is sourced from the original manufacturer or authorized distributors?
All MCP1812AT-028/OT 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 MCP1812AT-028/OT meets industry standards.
7.What is the process for return or replacement of MCP1812AT-028/OT?
All MCP1812AT-028/OT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1812AT-028/OT, 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 MCP1812AT-028/OT part is unused and in its original packaging.
Return procedure for MCP1812AT-028/OT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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