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Microchip Technology MCP1812AT-040/7QX
- Part No.:
- MCP1812AT-040/7QX
- Manufacturer:
- Microchip Technology
- Package:
- 4-UDFN Exposed Pad
- Datasheet:
-
MCP1812AT-040/7QX.pdf
- Description:
- IC REG LINEAR 4V 300MA 4UQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,622
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Product details
Overview
MCP1812AT-040/7QX from Microchip Technology is a 300 mA ultra-low-quiescent-current LDO regulator with 4.0 V fixed output, 250 nA typical IQ, 1.8–5.5 V input range, and output discharge functionality (MCP1812A variant). It targets energy harvesting and long-life battery-powered systems where sleep-mode current minimization is critical-e.g., wearable medical sensors operating from coin cells.
For engineers reviewing the MCP1812AT-040/7QX datasheet, MCP1812AT-040/7QX pinout, MCP1812AT-040/7QX application, or MCP1812AT-040/7QX equivalent, key selection criteria include its 4.0 V output accuracy (±4%), 2.2 µF ceramic capacitor stability requirement, shutdown current of 10 nA (typ), dropout voltage ≤600 mV at 300 mA, and compatibility with 4-lead 1×1 mm UDFN packaging.
Technical Context
The MCP1812AT-040/7QX implements a PMOS pass transistor architecture enabling ultra-low quiescent current while maintaining fast transient response and stable regulation across –40°C to +85°C junction temperature. Its integrated discharge transistor (RDCH = 100 Ω) actively pulls VOUT to GND during shutdown (SHDN = GND), eliminating residual voltage hold-up in low-power sequencing.
Designed for minimal external components, it operates stably with only a 2.2 µF X7R ceramic output capacitor and requires no input capacitor under most conditions. PSRR reaches –50 dB at 1 kHz with no CIN, supporting noise-sensitive analog and RF subsystems powered from noisy sources.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 4.0 V ±4% - ensures precise biasing for 3.3 V–5 V logic interfaces without external feedback. |
| Max Output Current | 300 mA - supports higher-current peripherals (e.g., BLE radios, display drivers) in compact wearables. |
| Quiescent Current | 250 nA typical - extends multi-year battery life in intermittent-sensing applications (e.g., environmental monitors). |
| Shutdown Current | 10 nA typical - enables true zero-power sleep states when paired with microcontrollers' deep-sleep modes. |
| Dropout Voltage | 600 mV max at 300 mA - allows operation down to 4.6 V input, maximizing usable battery voltage range. |
| Stability Capacitor | 2.2 µF ceramic (X7R) - reduces BOM count and board area vs. tantalum; enables low-noise, high-PSRR performance. |
| Operating Temp | –40°C to +85°C - qualified for industrial and medical-grade portable equipment environments. |
Pinout & Package
Package: 4-Lead 1 × 1 mm UDFN with exposed thermal pad (EP). Compact footprint (1.0 mm²) and low profile (0.5 mm height) suit space-constrained wearables and implantables.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 1.8–5.5 V; internal overcurrent protection limits fault current to 500–840 mA. |
| SHDN | Active-low enable/disable control | Pulled high internally; <20% VIN asserts shutdown; leakage <0.5 nA preserves battery during off-state. |
| VOUT | Regulated 4.0 V output | Internally discharged to GND via 100 Ω switch when SHDN = GND - prevents back-powering downstream circuits. |
| GND | Ground reference | Low-impedance return path; tie directly to output capacitor ground for optimal PSRR and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ (250 nA) | Enables >10-year battery life in devices waking once per hour for sensor readout and BLE transmission. |
| Output discharge (MCP1812A) | Eliminates need for external bleed resistors; ensures safe power-down sequencing in multi-rail systems. |
| 2.2 µF ceramic stability | Reduces solution size by >50% vs. traditional 10 µF tantalum; improves reliability and temperature stability. |
| High PSRR (–50 dB @ 1 kHz) | Rejects switching noise from DC-DC converters, enabling clean analog/RF supply without additional filtering. |
| Wide input range (1.8–5.5 V) | Supports direct connection to single Li-ion, two alkaline, or energy-harvesting storage elements without pre-regulation. |
Applications
| Wearable Health Monitor | Energy-Harvesting Sensor Node |
|---|---|
|
Use Scenario: Continuous ECG/PPG sensing with Bluetooth Low Energy (BLE) burst transmission every 5 minutes. IC Role / Device Role / Timing Role: Primary 4.0 V supply for analog front-end and BLE SoC; enables deep-sleep between measurements. Use Value: 10 nA shutdown current extends CR2032 battery life beyond 3 years; 300 mA peak supports BLE radio transmit bursts. |
Use Scenario: Solar- or thermal-harvested power management for wireless structural health monitoring in remote infrastructure. IC Role / Device Role / Timing Role: Final-stage LDO regulating harvested energy into stable 4.0 V for MCU and LoRa transceiver. Use Value: 250 nA IQ minimizes parasitic drain during low-light/low-ΔT periods; 2.2 µF ceramic cap tolerates wide temperature swings. |
| Smart Card with Secure Element | Hearing Aid Audio Processor |
|
Use Scenario: Contactless smart card with embedded secure element requiring strict power budgeting and fast wake-up. IC Role / Device Role / Timing Role: Provides regulated 4.0 V to secure IC and NFC controller; output discharge prevents data corruption on power removal. Use Value: Active discharge eliminates hold-up time, enabling deterministic reset; 600 mV dropout maximizes usable voltage from thin-film battery. |
Use Scenario: Miniature rechargeable hearing aid using ultra-low-power DSP and MEMS microphone array. IC Role / Device Role / Timing Role: Powers audio codec and DSP core; must maintain regulation during 300 mA peak current draw from speaker driver. Use Value: 300 mA capability supports dynamic audio peaks; 4.0 V output matches DSP I/O voltage spec, avoiding level shifters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6210B402MR-G | 4.0 V fixed, 200 mA max, 250 nA IQ, no output discharge, SOT-25 package | Lacks active VOUT discharge; requires external resistor for safe shutdown; lower current limit restricts use with high-peak peripherals. | Select when output discharge is unnecessary and board space permits larger SOT-25; verify thermal derating at 200 mA. |
| Ricoh RP114K401D-TR-F | 4.0 V fixed, 300 mA max, 300 nA IQ, no output discharge, DFN1006-4 package | Higher IQ (300 nA vs. 250 nA); no discharge transistor; smaller 1.0×0.6 mm package but no exposed pad for thermal relief. | Choose for ultra-miniature designs where 50 nA IQ difference is acceptable and thermal load is light (<150 mA continuous). |
Compared with XC6210B402MR-G and RP114K401D-TR-F, the MCP1812AT-040/7QX uniquely combines 300 mA capability, 250 nA IQ, and integrated output discharge in a thermally enhanced 1×1 mm UDFN-making it optimal for space- and power-constrained systems requiring deterministic power-down behavior.
Availability
MCP1812AT-040/7QX is available at Aetrix Electronics and suitable for energy harvesting nodes, wearable medical sensors, and smart card security modules requiring stable component supply, long-lifecycle support, and guaranteed traceability.
Supply support for MCP1812AT-040/7QX 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 silicon and development tools.
The MCP1811/12 family was designed specifically for ultra-low-power, battery- and energy-harvesting–powered applications-prioritizing nanoscale quiescent current, minimal external components, and robust operation across wide temperature and load ranges.
FAQ
What is the maximum input voltage rating for the MCP1812AT-040/7QX?
The MCP1812AT-040/7QX has an absolute maximum input voltage rating of +6.0 V. Operation above this voltage risks permanent damage. For reliable continuous operation, the recommended input 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-040/7QX require an input capacitor?
The MCP1812AT-040/7QX does not require an input capacitor for stability under most conditions, as confirmed in the datasheet AC/DC characteristics section. However, a 1 µF ceramic capacitor is recommended at VIN if the source impedance exceeds 1 Ω or if the device is powered from a switching regulator to suppress high-frequency noise.
How does the output discharge function work in the MCP1812AT-040/7QX?
The MCP1812AT-040/7QX integrates an NMOS discharge transistor (RDCH = 100 Ω typical) between VOUT and GND. When SHDN is pulled low, this switch activates, discharging the output capacitor rapidly. This prevents residual voltage from powering downstream circuitry and ensures clean, deterministic power-down sequencing-critical in secure and safety-critical systems.
What is the thermal resistance (θJA) of the MCP1812AT-040/7QX in its 4-lead UDFN package?
The MCP1812AT-040/7QX in the 4-Lead 1×1 mm UDFN package has a thermal resistance θJA of 91.05°C/W when mounted on a JEDEC-standard 4-layer FR4 board with 1 oz. copper and thermal vias. This value assumes proper use of the exposed thermal pad (EP) for heat dissipation.
Can the MCP1812AT-040/7QX be used with a 1 µF output capacitor?
No-the MCP1812AT-040/7QX requires a minimum 2.2 µF ceramic (X7R) output capacitor for guaranteed stability, as specified in the datasheet. Using only 1 µF may cause oscillation or poor transient response, especially at full 300 mA load. The 2.2 µF value is mandatory for the MCP1812X series (vs. 1.0 µF for MCP1811X).
MCP1812AT-040/7QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 4-UDFN Exposed Pad
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 4V
- 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-040/7QX FAQ
1.How can I place an order for MCP1812AT-040/7QX through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1812AT-040/7QX 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-040/7QX reliable?
The price and inventory of MCP1812AT-040/7QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1812AT-040/7QX is usually 5 days.
3.What payment methods are accepted for MCP1812AT-040/7QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1812AT-040/7QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1812AT-040/7QX?
MCP1812AT-040/7QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1812AT-040/7QX 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-040/7QX?
For technical support, including MCP1812AT-040/7QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1812AT-040/7QX requirements.
6.How does Aetrix verify that MCP1812AT-040/7QX is sourced from the original manufacturer or authorized distributors?
All MCP1812AT-040/7QX 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-040/7QX meets industry standards.
7.What is the process for return or replacement of MCP1812AT-040/7QX?
All MCP1812AT-040/7QX units undergo pre-shipment inspection (PSI). If there is an issue with MCP1812AT-040/7QX, 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-040/7QX part is unused and in its original packaging.
Return procedure for MCP1812AT-040/7QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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