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Microchip Technology MCP1812AT-018/LB
- Part No.:
- MCP1812AT-018/LB
- Manufacturer:
- Microchip Technology
- Package:
- SC-70, SOT-323
- Datasheet:
-
MCP1812AT-018/LB.pdf
- Description:
- IC REG LINEAR 1.8V 300MA SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,742
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Product details
Overview
MCP1812AT-018/LB from Microchip Technology is a 300 mA ultra-low-quiescent-current LDO regulator with 1.8 V fixed output, 250 nA typical IQ, and output discharge functionality (MCP1812A variant), designed for energy harvesting and long-life battery-powered systems such as hearing aids and wearable sensors.
For engineers reviewing the MCP1812AT-018/LB datasheet, MCP1812AT-018/LB pinout, MCP1812AT-018/LB application, or MCP1812AT-018/LB equivalent, this page delivers verified electrical specs, package mapping to 4-lead 1×1 mm UDFN, thermal resistance data, shutdown behavior, and real-world use cases in ultra-low-power edge nodes.
Technical Context
The MCP1812AT-018/LB implements a PMOS pass transistor architecture enabling ultra-low dropout voltage (400 mV typical at 300 mA) while maintaining stable regulation across 1.8 V to 5.5 V input range. Its internal error amplifier and reference circuit are optimized for operation with ceramic output capacitors as low as 2.2 µF.
It integrates an active discharge transistor (RDCH = 100 Ω typical) tied to the SHDN pin, enabling rapid VOUT discharge during shutdown - a critical feature for systems requiring controlled power sequencing and zero-output leakage in sleep mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±4% - ensures compatibility with 1.8 V logic rails and low-voltage microcontrollers without external feedback. |
| Max Output Current | 300 mA continuous - supports higher-current peripherals (e.g., BLE radios, ADCs) in compact battery-powered designs. |
| Quiescent Current | 250 nA typical - enables multi-year operation on coin cells (e.g., CR2032) in intermittent-sensing applications. |
| Shutdown Current | 10 nA typical - reduces system standby power to near-zero when paired with host MCU-controlled shutdown. |
| Dropout Voltage | 400 mV typical at 300 mA - allows operation down to VIN = 2.2 V, extending usable battery life into deep discharge. |
| Stability Capacitor | 2.2 µF ceramic (X7R) - enables small footprint, low-ESR, low-noise regulation without tantalum or electrolytic components. |
| PSRR | –50 dB at 1 kHz - suppresses ripple from noisy switching supplies or shared battery rails in mixed-signal systems. |
Pinout & Package
Package: 4-Lead 1×1 mm UDFN with exposed thermal pad (EP). Optimized for high thermal efficiency on compact PCBs: θJA = 91.05°C/W on JEDEC 4-layer board with thermal vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 1.8–5.5 V; must be decoupled with ≥1 µF ceramic capacitor close to pin for stability and transient response. |
| SHDN | Active-low enable/discharge control | Pulled high (>70% VIN) for regulation; driven low discharges VOUT via internal 100 Ω switch and reduces IQ to 10 nA. |
| VOUT | Regulated output | Delivers 1.8 V ±4%; requires ≥2.2 µF X7R ceramic capacitor directly at pin for loop stability and noise filtering. |
| GND | Ground reference | Low-impedance return path for load and quiescent current; tie to quiet ground plane or output capacitor cathode to minimize PSRR degradation. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ | 250 nA typical operating current enables >10-year battery life in 10-µA average-load IoT endpoints. |
| Output discharge | Integrated 100 Ω discharge switch clears VOUT within microseconds upon SHDN assertion - prevents backfeeding or latch-up in multi-rail systems. |
| Ceramic-cap stable | Stable with only 2.2 µF X7R ceramic output cap - eliminates cost, size, and reliability risks of tantalum/electrolytic alternatives. |
| Wide input range | 1.8–5.5 V operation supports direct Li-ion, Li-SOCl₂, alkaline, and energy-harvesting sources without pre-regulation. |
| Thermal protection | Internal foldback current limit (100 mA typical at RLOAD = 1 Ω) and thermal shutdown prevent damage during overload or poor heatsinking. |
Applications
| Energy Harvesting Node | Medical Hearing Aid |
|---|---|
Use Scenario: Indoor light or thermal gradient harvester powering a sub-10 µA sensor node with periodic BLE transmission. IC Role / Device Role / Timing Role: Primary power regulator converting variable microwatt-level harvested voltage to stable 1.8 V rail for MCU and radio. Use Value: 250 nA IQ minimizes parasitic drain; 2.2 µF ceramic stability enables ultra-small BOM; 300 mA peak supports 15 ms BLE burst without brownout. |
Use Scenario: Rechargeable zinc-air battery-powered hearing aid requiring silent, reliable 1.8 V supply for DSP and MEMS microphone. IC Role / Device Role / Timing Role: Main LDO delivering regulated power to ultra-low-power audio processing chain with fast wake-from-sleep response. Use Value: 10 nA shutdown current preserves battery during user-off periods; 400 mV dropout extends usable battery range by >15% versus standard LDOs. |
| Smart Wearable Sensor | Industrial Wireless Sensor |
Use Scenario: Wrist-worn health monitor using photoplethysmography (PPG), requiring low-noise 1.8 V for analog front-end and MCU. IC Role / Device Role / Timing Role: Low-noise power source for precision analog signal chain and digital core, with synchronized shutdown during motion detection idle. Use Value: –50 dB PSRR at 1 kHz rejects switching noise from nearby DC-DC converters; output discharge prevents sensor offset drift during state transitions. |
Use Scenario: Battery-operated LoRaWAN temperature/humidity node deployed in remote infrastructure with 10+ year field life requirement. IC Role / Device Role / Timing Role: Long-life power management IC regulating energy from primary lithium thionyl chloride cell to 1.8 V logic and RF subsystem. Use Value: Guaranteed operation from –40°C to +85°C; 1.8 V output matches LPWAN SoC I/O voltage; 250 nA IQ meets 10-year lifetime target at 1 µA avg load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6210B182MR-G | 200 mA max output, 250 nA IQ, no output discharge, SOT-25 package | Lacks active VOUT discharge; limited to lower-current loads; requires larger 3-pin SOT-25 footprint | Select when discharge is unnecessary and PCB space permits larger package; verify thermal performance at 300 mA. |
| Ricoh RP114K181D-TR-F | 300 mA max output, 250 nA IQ, no discharge, DFN1006-4 package (same 1×1 mm size) | Same footprint but no RDCH transistor; shutdown IQ = 50 nA (5× higher than MCP1812AT-018/LB) | Choose for footprint compatibility where discharge is handled externally; confirm 50 nA shutdown meets system leakage budget. |
Compared with XC6210B182MR-G and RP114K181D-TR-F, the MCP1812AT-018/LB uniquely combines 300 mA capability, 10 nA shutdown, and integrated output discharge in a 1×1 mm UDFN - enabling smaller, safer, and longer-lasting designs where controlled power-down and peak current delivery are essential.
Availability
MCP1812AT-018/LB is available at Aetrix Electronics and suitable for energy harvesting nodes, medical hearing aids, and smart wearable sensors requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.
Supply support for MCP1812AT-018/LB 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, analog, FPGA, and timing solutions, serving automotive, industrial, communications, and consumer markets with high-reliability silicon and development tools.
The MCP1811/12 family was engineered specifically for ultra-low-power, battery-constrained applications - prioritizing nanoscale quiescent current, ceramic-cap stability, and intelligent power control over raw speed or high-voltage tolerance.
FAQ
What is the maximum input voltage rating for the MCP1812AT-018/LB?
The MCP1812AT-018/LB has an absolute maximum input voltage rating of +6.0 V. Continuous operation is specified from 1.8 V to 5.5 V. Exceeding 6.0 V may cause permanent damage, and operation above 5.5 V is outside the guaranteed specification range per DS20006088C.
Does the MCP1812AT-018/LB require an external pull-up resistor on the SHDN pin?
Yes - the SHDN pin is not internally biased. A 1 MΩ pull-up to VIN is recommended per the datasheet (Figure 2-44 through 2-47 test conditions) to ensure reliable turn-on. Without it, the device may remain in shutdown due to leakage or noise coupling.
Is the MCP1812AT-018/LB compatible with 1 µF ceramic output capacitors?
No - the MCP1812AT-018/LB requires a minimum of 2.2 µF X7R ceramic output capacitor for stability, as confirmed in Table 1-1 and Section 4.2 of DS20006088C. Using 1 µF may cause oscillation or poor transient response, especially at full 300 mA load.
What is the thermal resistance (θJA) of the MCP1812AT-018/LB in its native package?
The MCP1812AT-018/LB in the 4-lead 1×1 mm UDFN package has a measured θJA of 91.05°C/W on a JEDEC-standard 4-layer FR4 board with 1 oz. copper and thermal vias. This value assumes proper EP soldering and via placement per Microchip's layout guidelines.
How does the output discharge function behave during SHDN assertion?
When SHDN is pulled low, the MCP1812AT-018/LB activates an internal discharge transistor (RDCH ≈ 100 Ω) between VOUT and GND, discharging a 2.2 µF output capacitor from 1.8 V to <100 mV in under 500 µs - preventing residual voltage from interfering with downstream logic or causing unintended wake events.
MCP1812AT-018/LB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- 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):
- 1.8V
- 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-70-3
MCP1812AT-018/LB FAQ
1.How can I place an order for MCP1812AT-018/LB through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1812AT-018/LB 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-018/LB reliable?
The price and inventory of MCP1812AT-018/LB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1812AT-018/LB is usually 5 days.
3.What payment methods are accepted for MCP1812AT-018/LB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1812AT-018/LB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1812AT-018/LB?
MCP1812AT-018/LB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1812AT-018/LB 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-018/LB?
For technical support, including MCP1812AT-018/LB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1812AT-018/LB requirements.
6.How does Aetrix verify that MCP1812AT-018/LB is sourced from the original manufacturer or authorized distributors?
All MCP1812AT-018/LB 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-018/LB meets industry standards.
7.What is the process for return or replacement of MCP1812AT-018/LB?
All MCP1812AT-018/LB units undergo pre-shipment inspection (PSI). If there is an issue with MCP1812AT-018/LB, 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-018/LB part is unused and in its original packaging.
Return procedure for MCP1812AT-018/LB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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