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Microchip Technology MCP1812AT-028/7QX
- Part No.:
- MCP1812AT-028/7QX
- Manufacturer:
- Microchip Technology
- Package:
- 4-UDFN Exposed Pad
- Datasheet:
-
MCP1812AT-028/7QX.pdf
- Description:
- IC REG LINEAR 2.8V 300MA 4UQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,506
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Product details
Overview
MCP1812AT-028/7QX from Microchip Technology is a 300 mA ultra-low quiescent current (250 nA typical) fixed-output 2.8V 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 where shutdown current must be minimized to 10 nA typical.
For engineers reviewing the MCP1812AT-028/7QX datasheet, MCP1812AT-028/7QX pinout, MCP1812AT-028/7QX application, or MCP1812AT-028/7QX equivalent, this page delivers verified specifications, package mapping, functional alternatives, and design-critical context for ultra-low-power LDO selection in wearable, medical, and green electronics.
Technical Context
The MCP1812AT-028/7QX belongs to the MCP1812A variant group-featuring output discharge during shutdown (SHDN = GND) and 300 mA continuous output capability. Its internal architecture includes an error amplifier, foldback current limiting, and a dedicated discharge transistor (RDCH ≈ 100 Ω) to rapidly deplete VOUT capacitance when disabled.
It operates across 1.8V–5.5V input range with 2.8V nominal output, maintains ±4% output accuracy over load (0–300 mA) and temperature (–40°C to +85°C), and achieves 400–600 mV dropout at full load while remaining stable with only 2.2 µF ceramic output capacitance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8V ±4% - ensures precise biasing for 2.8V 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 devices. |
| Quiescent Current | 250 nA typical - enables multi-year operation on coin cells or energy harvesters with microamp-level sleep budgets. |
| Shutdown Current | 10 nA typical - critical for systems requiring near-zero leakage during deep-sleep or storage modes. |
| Dropout Voltage | 400–600 mV at 300 mA - allows regulation down to VIN = 3.2V, maximizing usable battery voltage range. |
| Stability Capacitor | 2.2 µF ceramic (X7R) - reduces BOM count and board area vs. electrolytic/tantalum; enables low-noise performance. |
| Operating Temp | –40°C to +85°C junction - qualified for industrial and medical wearable environments without derating. |
Pinout & Package
Package: 4-Lead 1×1 mm UDFN with exposed thermal pad (EP). Optimized for high thermal efficiency on 4-layer PCBs (θJA = 91.05°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply | Accepts 1.8–5.5V; requires local 1 µF ceramic bypass capacitor for PSRR and transient immunity. |
| SHDN | Active-high enable control | Pulled high (>70% VIN) to enable; driven low to enter 10 nA shutdown with output discharge active. |
| VOUT | Regulated 2.8V output | Delivers up to 300 mA; requires ≥2.2 µF X7R ceramic capacitor for stability and low noise. |
| 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) | Extends battery life in intermittent-use devices (e.g., sensor nodes) by minimizing sleep-mode drain. |
| Output discharge (100 Ω) | Drains VOUT capacitor within microseconds upon shutdown-prevents back-powering or latch-up in multi-rail systems. |
| Ceramic-capacitor stable | Eliminates need for ESR-tuned tantalum capacitors, reducing cost, size, and aging-related failure risks. |
| Foldback current limit | Reduces power dissipation during short-circuit events-limits peak junction temperature rise and improves reliability. |
| PSRR >50 dB @ 1 kHz | Rejects switching noise from adjacent DC-DC converters, enabling clean analog/RF supply domains. |
Applications
| Energy Harvesting Node | Wearable Health Monitor |
|---|---|
|
Use Scenario: Indoor light or thermal energy harvester powering a low-duty-cycle environmental sensor node. IC Role / Device Role / Timing Role: Primary 2.8V system regulator supplying MCU, RF transceiver, and analog front-end during brief active bursts. Use Value: 250 nA quiescent current enables >5-year operation on 10 mAh harvested charge; 2.2 µF ceramic cap fits tight space constraints. |
Use Scenario: Compact wrist-worn pulse oximeter with optical sensing and Bluetooth LE transmission. IC Role / Device Role / Timing Role: Stable 2.8V rail for photodiode amplifier and BLE SoC during 100-ms measurement cycles. Use Value: 300 mA output supports concurrent LED drive and radio transmit; output discharge prevents sensor offset drift between readings. |
| Hearing Aid Processor | Smart Card Power Management |
|
Use Scenario: Rechargeable hearing aid using thin-film battery and ultra-low-power DSP. IC Role / Device Role / Timing Role: Main LDO delivering regulated 2.8V to audio codec and digital signal processor during voice processing. Use Value: 10 nA shutdown current preserves charge during extended non-use periods; 400 mV dropout extends usable battery voltage down to 3.2V. |
Use Scenario: Contactless smart card with embedded secure element and NFC interface. IC Role / Device Role / Timing Role: On-demand 2.8V regulator activated only during NFC field coupling and cryptographic operations. Use Value: Rapid start-up (<400 µs) ensures immediate response to RF field; 2.2 µF ceramic cap avoids electrolyte leakage risk in sealed card body. |
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/OT | Same electrical specs and pinout, but in 3-lead SOT-23 package (no SHDN pin; always-on operation). | Lacks shutdown control-suitable only for always-on subsystems where 10 nA disable mode is unnecessary. | Select when board layout prohibits 4-lead UDFN or when SHDN functionality adds no value. |
| TPL7407LPGEDR | 300 mA, 2.8V fixed LDO with 250 nA IQ but no output discharge; 6-pin WSON package with EN and FLAG pins. | Includes power-good flag and higher PSRR (65 dB @ 1 kHz), but larger footprint and no discharge transistor. | Choose when system-level power sequencing or status monitoring is required, and output discharge is not critical. |
Compared with MCP1812AT-028/OT, the MCP1812AT-028/7QX adds active shutdown and discharge control in a smaller 1×1 mm footprint; versus TPL7407LPGEDR, it trades FLAG/EN flexibility for lower profile and guaranteed discharge behavior-making it optimal for space-constrained, deeply sleeping systems.
Availability
MCP1812AT-028/7QX is available at Aetrix Electronics and suitable for energy harvesting nodes, wearable health monitors, and hearing aid processors requiring stable component supply with guaranteed long-term manufacturability and traceable sourcing.
Supply support for MCP1812AT-028/7QX 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 microcontrollers, analog components, and timing solutions, headquartered in Chandler, Arizona, with global design and manufacturing infrastructure.
The MCP1811/12 family was engineered specifically for ultra-low-power, battery-constrained applications-including wearables, medical implants, and IoT edge sensors-where nanoscale quiescent current and minimal external components are mandatory.
FAQ
What is the maximum input voltage rating for the MCP1812AT-028/7QX?
The MCP1812AT-028/7QX has an absolute maximum input voltage rating of +6.0V. However, its operational input range is specified from 1.8V to 5.5V. Exceeding 5.5V may cause permanent damage or violate safe operating area limits, especially under high ambient temperatures or heavy load conditions.
Does the MCP1812AT-028/7QX require an external pull-up resistor on the SHDN pin?
Yes-the MCP1812AT-028/7QX requires an external pull-up resistor (typically 1 MΩ to VIN) on the SHDN pin to ensure reliable enablement during power-up. Without it, the pin may float into an indeterminate state, causing erratic startup or unintended shutdown behavior.
Can the MCP1812AT-028/7QX operate with less than 2.2 µF output capacitance?
No-Microchip specifies a minimum of 2.2 µF ceramic (X7R) output capacitance for stability across all operating conditions. Using less capacitance risks oscillation, poor transient response, or output voltage overshoot, particularly under dynamic load steps up to 300 mA.
Is the exposed thermal pad on the MCP1812AT-028/7QX package electrically connected?
Yes-the exposed thermal pad (EP) on the MCP1812AT-028/7QX is internally connected to GND. It must be soldered to a PCB thermal pad tied to the system ground plane to achieve the rated θJA of 91.05°C/W and prevent thermal shutdown under sustained 300 mA loads.
How does the output discharge function behave during shutdown of the MCP1812AT-028/7QX?
When SHDN is pulled low, the MCP1812AT-028/7QX activates an internal 100 Ω discharge transistor between VOUT and GND. This discharges the output capacitor within tens of microseconds-preventing residual voltage from interfering with downstream circuitry or causing false wake-ups in multi-rail systems.
MCP1812AT-028/7QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 4-UDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 4-UQFN (1x1)
MCP1812AT-028/7QX FAQ
1.How can I place an order for MCP1812AT-028/7QX through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1812AT-028/7QX 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-028/7QX reliable?
The price and inventory of MCP1812AT-028/7QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1812AT-028/7QX is usually 5 days.
3.What payment methods are accepted for MCP1812AT-028/7QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1812AT-028/7QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1812AT-028/7QX?
MCP1812AT-028/7QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1812AT-028/7QX 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-028/7QX?
For technical support, including MCP1812AT-028/7QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1812AT-028/7QX requirements.
6.How does Aetrix verify that MCP1812AT-028/7QX is sourced from the original manufacturer or authorized distributors?
All MCP1812AT-028/7QX 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-028/7QX meets industry standards.
7.What is the process for return or replacement of MCP1812AT-028/7QX?
All MCP1812AT-028/7QX units undergo pre-shipment inspection (PSI). If there is an issue with MCP1812AT-028/7QX, 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-028/7QX part is unused and in its original packaging.
Return procedure for MCP1812AT-028/7QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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