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Microchip Technology MCP1812AT-028/LT
- Part No.:
- MCP1812AT-028/LT
- Manufacturer:
- Microchip Technology
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
MCP1812AT-028/LT.pdf
- Description:
- IC REG LINEAR 2.8V 300MA SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,474
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Product details
Overview
MCP1812AT-028/LT from Microchip Technology is an ultra-low quiescent current (250 nA typical), 300 mA output, fixed 2.8V low-dropout linear regulator in a 3-lead SOT-23 package with output discharge and shutdown control. It operates from 1.8V to 5.5V input, supports ceramic output capacitors down to 2.2 µF, and delivers stable voltage for battery-powered wearables and medical devices.
For engineers reviewing the MCP1812AT-028/LT datasheet, MCP1812AT-028/LT pinout, MCP1812AT-028/LT application, or MCP1812AT-028/LT equivalent, this page provides verified electrical specs, thermal performance data, shutdown behavior, output discharge capability, and real-world load regulation curves - all confirmed for the exact MCP1812AT-028/LT variant.
Technical Context
The MCP1812AT-028/LT implements a PMOS pass transistor architecture enabling ultra-low dropout (400–600 mV at 300 mA) and sub-µA quiescent operation. Its internal error amplifier and reference maintain ±4% output accuracy over -40°C to +85°C junction temperature while supporting fast dynamic load response (≤400 µs startup delay).
It features integrated overcurrent protection with foldback (100 mA at RLOAD = 1 Ω), output discharge during shutdown (enabled on MCP1812A variants), and robust PSRR (-50 dB at 1 kHz) without requiring input capacitance - critical for noise-sensitive sensor and hearing aid applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8V ±4% - ensures stable rail for 2.8V logic or analog circuitry without external feedback components. |
| Max Output Current | 300 mA - sufficient to power microcontrollers, BLE radios, and multi-sensor nodes in compact wearable designs. |
| Quiescent Current | 250 nA typical - enables >10-year battery life in coin-cell-powered devices operating in deep sleep mode. |
| Shutdown Current | 10 nA typical - reduces system standby leakage to negligible levels when paired with MCU-controlled SHDN. |
| Dropout Voltage | 400–600 mV at 300 mA - allows operation down to 3.2V input with 2.8V output, maximizing usable battery voltage range. |
| Stability Capacitor | 2.2 µF ceramic (X7R) - enables small footprint, low-ESR, low-noise filtering without tantalum or electrolytic alternatives. |
| PSRR | -50 dB at 1 kHz - suppresses switching noise from adjacent DC/DC converters without additional LC filtering. |
Pinout & Package
Package: 3-Lead SOT-23 (SC-59), JEDEC MO-178AA, 2.92 mm × 1.3 mm × 1.0 mm body, exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT | Regulated output voltage | Delivers fixed 2.8V to load; requires 2.2 µF ceramic capacitor to GND for stability and low noise. |
| VIN | Input supply voltage | Accepts 1.8V–5.5V; must exceed VOUT + dropout (≥3.2V) under full 300 mA load. |
| GND | Ground reference | Return path for load and quiescent current; tie directly to output capacitor ground for optimal PSRR. |
Key Features
| Feature | Design Value |
|---|---|
| Output Discharge on Shutdown | Active discharge path (RDCH ≤100 Ω) pulls VOUT to GND within microseconds when SHDN = GND - prevents floating rails and unintended wake-up in multi-rail systems. |
| Ultra-Low IQ Architecture | 250 nA typical operating current enables >10-year shelf life in energy-harvesting nodes powered by microwatt sources. |
| Ceramic-Capacitor Stability | Guaranteed stable with 2.2 µF X7R ceramic only - eliminates need for larger, higher-ESR capacitors and simplifies BOM. |
| Foldback Current Limit | 100 mA short-circuit current at 1 Ω load - limits power dissipation during fault conditions without thermal shutdown interruption. |
| Wide Input Range | 1.8V–5.5V operation supports single-cell Li-ion (3.0–4.2V), alkaline (1.8–3.0V), and USB-powered (5.0V) configurations. |
Applications
| Energy Harvesting Sensor Node | Smart Hearing Aid |
|---|---|
Use Scenario: Self-powered environmental monitor harvesting µW-level energy from light or vibration. IC Role / Device Role / Timing Role: Primary voltage regulator supplying 2.8V to ultra-low-power MCU and RF transceiver during intermittent wake cycles. Use Value: 250 nA quiescent current extends operational uptime between harvest events; 2.2 µF ceramic capacitor minimizes board area in constrained form factor. | Use Scenario: Miniaturized Class A/B hearing aid requiring consistent 2.8V rail for audio codec and amplifier. IC Role / Device Role / Timing Role: Low-noise LDO delivering clean 2.8V supply independent of battery voltage sag during peak audio bursts. Use Value: -50 dB PSRR at 1 kHz rejects switching noise from companion DC/DC; 400–600 mV dropout preserves battery runtime down to 3.2V. |
| Long-Life Wearable Tracker | Medical Implantable Monitor |
Use Scenario: Subdermal glucose monitor powered by CR2032 coin cell with 10+ year target lifetime. IC Role / Device Role / Timing Role: Main power regulator enabling deep-sleep states where only real-time clock and sensor interface remain active. Use Value: 10 nA shutdown current prevents measurable battery drain during 99.9% sleep duty cycle; output discharge ensures safe reset on power-up. | Use Scenario: ISO 13485-certified implantable cardiac event recorder operating inside sealed titanium housing. IC Role / Device Role / Timing Role: Safety-critical voltage regulator providing fault-tolerant 2.8V supply with overcurrent foldback and thermal margin. Use Value: Guaranteed -40°C to +85°C operation meets clinical ambient requirements; no external components needed for stability reduces failure modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1812AT-028/TT | Same electrical specs and pinout; packaged in 3-lead SC70 (2.0 × 1.25 mm) instead of SOT-23. | SC70 offers smaller footprint but higher thermal resistance (θJA = 300.6°C/W vs. 211.33°C/W for SOT-23), limiting continuous 300 mA use in high-ambient environments. | Select MCP1812AT-028/TT only when PCB area is more critical than thermal headroom and full-load duration is brief. |
| Torex XC6210B282MR-G | 2.8V fixed output, 300 mA, 250 nA IQ, but lacks output discharge and has higher dropout (650 mV typ. at 300 mA). | No discharge function increases risk of residual voltage causing latch-up in multi-rail systems; higher dropout reduces usable battery range. | Choose only if output discharge is unnecessary and thermal design accommodates higher dropout-induced losses. |
Compared with MCP1812AT-028/TT, the MCP1812AT-028/LT offers superior thermal performance in SOT-23 for sustained 300 mA loads; versus XC6210B282MR-G, it adds critical output discharge and lower dropout - both essential for reliable reset behavior and extended battery life in medical wearables.
Availability
MCP1812AT-028/LT is available at Aetrix Electronics and suitable for energy harvesting sensor nodes, smart hearing aids, long-life wearable trackers, medical implantable monitors, and ultra-low-power IoT edge devices requiring stable component supply across multi-year production cycles.
Supply support for MCP1812AT-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 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 MCP1811/1812 family was designed specifically for ultra-low-power, long-life battery applications - emphasizing nanoscale quiescent current, ceramic-capacitor compatibility, and integrated safety features like output discharge and foldback current limiting.
FAQ
What is the maximum continuous output current of the MCP1812AT-028/LT?
The MCP1812AT-028/LT delivers up to 300 mA continuously under specified thermal conditions (TA ≤ +85°C, θJA = 211.33°C/W on JEDEC 4-layer board). At higher ambient temperatures or with limited airflow, derating applies - e.g., ~220 mA at TA = +70°C with no heatsink. The device includes foldback current limiting (100 mA at 1 Ω) to protect against shorts.
Does the MCP1812AT-028/LT require an input capacitor?
No, the MCP1812AT-028/LT is stable without an input capacitor, as confirmed in the datasheet AC/DC specifications (PSRR testing performed with CIN = 0 µF). However, a 1 µF ceramic capacitor placed close to VIN and GND is recommended to reduce high-frequency noise coupling and improve transient response during line steps.
How does the output discharge feature work on the MCP1812AT-028/LT?
The MCP1812AT-028/LT (an "A" variant) activates an internal discharge transistor (RDCH ≤100 Ω) when SHDN is pulled low, rapidly pulling VOUT to GND. This prevents residual voltage from holding downstream logic in undefined states or causing unintended wake-up - a critical requirement in systems with multiple power domains or strict reset sequencing.
What is the minimum input voltage required for the MCP1812AT-028/LT to regulate 2.8V at 300 mA?
The MCP1812AT-028/LT requires VIN ≥ VOUT + VDROPOUT(MAX). Per datasheet Table 1, VDROPOUT is 400–600 mV at 300 mA, so minimum VIN is 3.2V (2.8V + 0.4V) under typical conditions. For guaranteed regulation across temperature and process variation, design for ≥3.4V input at full load.
Can the MCP1812AT-028/LT be used with a 1.5V alkaline battery?
No - the MCP1812AT-028/LT has a minimum input voltage specification of 1.8V. A fresh 1.5V alkaline cell starts at ~1.6V and drops below 1.5V quickly under load; it cannot meet the 1.8V minimum required for regulation. Use only with ≥1.8V sources such as LiFePO4 (2.0–3.6V), Li-ion (3.0–4.2V), or two alkaline cells in series (2.4–3.0V).
MCP1812AT-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
MCP1812AT-028/LT FAQ
1.How can I place an order for MCP1812AT-028/LT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1812AT-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 MCP1812AT-028/LT reliable?
The price and inventory of MCP1812AT-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 MCP1812AT-028/LT is usually 5 days.
3.What payment methods are accepted for MCP1812AT-028/LT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1812AT-028/LT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1812AT-028/LT?
MCP1812AT-028/LT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1812AT-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 MCP1812AT-028/LT?
For technical support, including MCP1812AT-028/LT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1812AT-028/LT requirements.
6.How does Aetrix verify that MCP1812AT-028/LT is sourced from the original manufacturer or authorized distributors?
All MCP1812AT-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 MCP1812AT-028/LT meets industry standards.
7.What is the process for return or replacement of MCP1812AT-028/LT?
All MCP1812AT-028/LT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1812AT-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 MCP1812AT-028/LT part is unused and in its original packaging.
Return procedure for MCP1812AT-028/LT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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