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Microchip Technology MCP1812AT-012/7QX
- Part No.:
- MCP1812AT-012/7QX
- Manufacturer:
- Microchip Technology
- Package:
- 4-UDFN Exposed Pad
- Datasheet:
-
MCP1812AT-012/7QX.pdf
- Description:
- IC REG LINEAR 1.2V 300MA 4UQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,432
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Product details
Overview
MCP1812AT-012/7QX from Microchip Technology is a 300 mA ultra-low quiescent current (250 nA typical) fixed 1.2 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 where shutdown current must be minimized to 10 nA typical.
For engineers reviewing the MCP1812AT-012/7QX datasheet, MCP1812AT-012/7QX pinout, MCP1812AT-012/7QX application, or MCP1812AT-012/7QX equivalent, this page delivers verified electrical specs, thermal resistance data, output discharge capability, ceramic capacitor stability requirements, and real-world load/line regulation behavior across temperature.
Technical Context
This device belongs to the MCP1812A variant group-featuring output discharge during shutdown (SHDN = GND), enabling rapid VOUT collapse to prevent back-powering of downstream circuitry. Its internal error amplifier and PMOS pass transistor deliver stable regulation down to 1.2 V output with dropout as low as 400 mV at 300 mA load.
The MCP1812AT-012/7QX operates across –40°C to +85°C junction temperature and supports input voltages from 2.4 V to 5.5 V when delivering full 300 mA output. It achieves –50 dB PSRR at 1 kHz with no input capacitor and maintains ±50 mV load regulation over its full current range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.2 V ±4% - ensures precise biasing for 1.2 V core logic or low-voltage sensors without external feedback. |
| Max Output Current | 300 mA - sufficient to power microcontrollers, BLE radios, or sensor signal chains in compact wearable designs. |
| Quiescent Current | 250 nA typical - enables multi-year operation on coin cells or harvested energy sources like solar or thermal. |
| Shutdown Current | 10 nA typical - critical for ultra-deep sleep modes in IoT edge nodes where every nanoamp impacts battery life. |
| Dropout Voltage | 400 mV max at 300 mA - allows operation from single-cell Li-ion (3.0 V min) or two alkaline cells (2.4 V min) with margin. |
| Stability Capacitor | 2.2 µF ceramic (X7R) - reduces solution size/cost vs. tantalum and lowers output noise to 169.31 µVRMS (10 Hz–100 kHz). |
| Thermal Resistance | θJA = 91.05°C/W - enables high power density on 4-layer PCBs with thermal vias under continuous 300 mA load. |
Pinout & Package
Package: 4-Lead 1×1 mm UDFN with exposed thermal pad (EP). Requires solder paste stencil design per Microchip's UDFN layout guidelines; EP must be connected to ground plane for optimal thermal performance and PSRR.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply | Accepts 2.4–5.5 V input; must be decoupled with ≥1 µF ceramic near pin to suppress high-frequency noise. |
| SHDN | Active-low enable control | Pulled high internally; drives <20% VIN to disable regulator and activate output discharge switch (RDCH ≈ 100 Ω). |
| VOUT | Regulated output | Delivers stable 1.2 V; requires ≥2.2 µF X7R ceramic capacitor directly at pin for loop stability and transient response. |
| GND | Ground reference | Low-impedance return path for ground current (≤220 µA at 300 mA); tie to quiet ground plane adjacent to output cap. |
Key Features
| Feature | Design Value |
|---|---|
| Output Discharge on Shutdown | Enables fast VOUT collapse (<100 µs) via integrated 100 Ω discharge transistor-prevents back-powering of sensitive peripherals. |
| Ceramic-Capacitor Stability | Guaranteed stable with only 2.2 µF X7R ceramic output cap-eliminates need for larger, more expensive tantalum or electrolytic capacitors. |
| Foldback Current Limit | 100 mA short-circuit foldback-limits power dissipation during fault conditions and protects pass transistor from thermal runaway. |
| Ultra-Low Noise Operation | 169.31 µVRMS (10 Hz–100 kHz) at 1.2 V/50 mA-suitable for powering precision analog front-ends and RF receivers without additional filtering. |
| Wide Input Range Support | Operates from 2.4 V (at 300 mA) up to 5.5 V-compatible with single-cell Li-ion, dual alkaline, or USB-supplied systems. |
Applications
| Energy Harvesting Node | Wearable Medical Sensor |
|---|---|
Use Scenario: Indoor light-harvesting system powering a BLE temperature sensor node using amorphous silicon photodiode. IC Role / Device Role / Timing Role: Primary power regulator converting variable 2.5–4.2 V harvested voltage to stable 1.2 V for MCU and radio. Use Value: 250 nA quiescent current extends usable runtime per harvest cycle; 10 nA shutdown current prevents leakage drain during dark periods. |
Use Scenario: Disposable ECG patch worn for 72-hour cardiac monitoring using CR2032 coin cell. IC Role / Device Role / Timing Role: Core voltage regulator supplying 1.2 V to ultra-low-power ADC and Bluetooth LE SoC during active sensing and deep-sleep intervals. Use Value: Output discharge ensures rapid VOUT decay upon sleep entry-eliminating residual voltage that could cause ADC offset drift or radio wake-up glitches. |
| Smart Card with Secure Element | Hearing Aid Front-End |
Use Scenario: Contactless payment card with embedded secure element and NFC interface powered by thin-film battery. IC Role / Device Role / Timing Role: Fixed-output LDO providing clean 1.2 V rail to cryptographic processor during brief transaction bursts. Use Value: ±4% output tolerance and ±50 mV load regulation ensure reliable digital logic margins even during 300 mA peak current transients. |
Use Scenario: Rechargeable hearing aid using zinc-air battery with dynamic load from microphone preamp and DSP. IC Role / Device Role / Timing Role: Low-noise 1.2 V supply for analog microphone bias and ADC reference, minimizing audible hiss. Use Value: 169.31 µVRMS noise floor and –50 dB PSRR at 1 kHz suppress switching noise from charging IC and DC-DC converters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6210B122MR-G | 1.2 V, 300 mA, 250 nA IQ, but no output discharge; SC70-5 package (higher θJA = 300.6°C/W). | Lacks discharge function-requires external MOSFET or resistor network to clear VOUT on shutdown. | Choose when board space permits SC70-5 and discharge is handled externally; verify thermal derating at 300 mA. |
| Ricoh RP114K121D-TR-F | 1.2 V, 300 mA, 300 nA IQ, no discharge; 4-bump DFN (1.0×1.0 mm) with θJA = 110°C/W (no EP). | No exposed pad limits thermal performance-derate output current above 60°C ambient. | Select when cost sensitivity outweighs thermal headroom; confirm stability with 2.2 µF X7R cap per datasheet. |
Compared with XC6210B122MR-G and RP114K121D-TR-F, the MCP1812AT-012/7QX uniquely integrates output discharge and delivers superior thermal performance (θJA = 91.05°C/W) due to its exposed pad UDFN package-enabling higher sustained current in space-constrained, thermally demanding applications.
Availability
MCP1812AT-012/7QX is available at Aetrix Electronics and suitable for energy harvesting nodes, wearable medical sensors, smart cards, and hearing aid front-ends requiring stable component supply with guaranteed long-term manufacturability.
Supply support for MCP1812AT-012/7QX 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 microcontroller, mixed-signal, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with high-reliability semiconductor products.
The MCP1812A family was engineered specifically for ultra-low-power, long-life battery and energy-harvesting applications-prioritizing nanoscale quiescent current, ceramic-capacitor compatibility, and integrated discharge functionality over raw speed or high-current density.
FAQ
What is the minimum input voltage required for MCP1812AT-012/7QX to deliver 300 mA at 1.2 V output?
The MCP1812AT-012/7QX requires a minimum input voltage of 2.4 V to sustain 300 mA output at 1.2 V, based on its maximum dropout voltage specification of 600 mV at full load. Below 2.4 V, the device enters dropout and output voltage will fall below regulation. This threshold is validated across –40°C to +85°C junction temperature per DS20006088C-page 4.
Does MCP1812AT-012/7QX support ceramic output capacitors, and what value is required?
Yes, MCP1812AT-012/7QX is explicitly designed for ceramic output capacitors. A minimum of 2.2 µF X7R ceramic capacitor is required at the VOUT pin for guaranteed stability and transient response, as confirmed in the "Stable with Ceramic Output Capacitor" feature and Table 1-1 of DS20006088C.
How does the output discharge function operate in MCP1812AT-012/7QX?
In MCP1812AT-012/7QX, the output discharge function activates automatically when SHDN is pulled low (≤20% VIN). An internal 100 Ω NMOS transistor (RDCH) connects VOUT to GND, discharging the output capacitor rapidly-typically within 100 µs for a 2.2 µF cap. This feature is exclusive to the MCP1812A variant, not present in MCP1812B.
What is the thermal resistance (θJA) of MCP1812AT-012/7QX, and how is it measured?
The MCP1812AT-012/7QX has a θJA of 91.05°C/W, measured on a JEDEC-standard 4-layer FR4 board with 1 oz. copper and thermal vias connecting the exposed pad (EP) to internal ground planes. This value assumes proper soldering of the EP and is critical for calculating junction temperature rise at 300 mA load.
Is MCP1812AT-012/7QX compatible with lead-free reflow profiles?
Yes, MCP1812AT-012/7QX is rated for standard lead-free reflow per J-STD-020 Rev E, with a peak temperature of 260°C. The 4-lead UDFN package uses matte tin (Sn) termination finish and meets RoHS and REACH compliance requirements as documented in Microchip's packaging specifications.
MCP1812AT-012/7QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 4-UDFN Exposed Pad
- 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):
- 1.2V
- 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-012/7QX FAQ
1.How can I place an order for MCP1812AT-012/7QX through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1812AT-012/7QX 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-012/7QX reliable?
The price and inventory of MCP1812AT-012/7QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1812AT-012/7QX is usually 5 days.
3.What payment methods are accepted for MCP1812AT-012/7QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1812AT-012/7QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1812AT-012/7QX?
MCP1812AT-012/7QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1812AT-012/7QX 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-012/7QX?
For technical support, including MCP1812AT-012/7QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1812AT-012/7QX requirements.
6.How does Aetrix verify that MCP1812AT-012/7QX is sourced from the original manufacturer or authorized distributors?
All MCP1812AT-012/7QX 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-012/7QX meets industry standards.
7.What is the process for return or replacement of MCP1812AT-012/7QX?
All MCP1812AT-012/7QX units undergo pre-shipment inspection (PSI). If there is an issue with MCP1812AT-012/7QX, 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-012/7QX part is unused and in its original packaging.
Return procedure for MCP1812AT-012/7QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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