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Microchip Technology MCP1812AT-012/LB
- Part No.:
- MCP1812AT-012/LB
- Manufacturer:
- Microchip Technology
- Package:
- SC-70, SOT-323
- Datasheet:
-
MCP1812AT-012/LB.pdf
- Description:
- IC REG LINEAR 1.2V 300MA SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,604
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Product details
Overview
MCP1812AT-012/LB from Microchip Technology is a 300 mA ultra-low-quiescent-current LDO regulator with fixed 1.2 V output, 250 nA typical operating IQ, and output discharge functionality (MCP1812A variant). It operates from 1.8 V to 5.5 V input, supports ceramic output capacitors ≥2.2 µF, and targets battery-powered systems requiring long operational life under light-load or sleep conditions - such as wearable medical sensors and energy-harvesting nodes.
For engineers reviewing the MCP1812AT-012/LB datasheet, MCP1812AT-012/LB pinout, MCP1812AT-012/LB application, or MCP1812AT-012/LB equivalent, this page delivers verified electrical specs, package mapping to 4-lead 1×1 mm UDFN, functional role in low-power supply rails, and validated alternative options for design continuity and sourcing flexibility.
Technical Context
The MCP1812AT-012/LB implements a PMOS pass transistor architecture enabling ultra-low dropout voltage (400 mV typical at 300 mA) and stable regulation down to 1.2 V output. Its internal error amplifier and feedback network are optimized for operation with minimal output capacitance (2.2 µF ceramic), reducing board area and cost while maintaining PSRR of –50 dB at 1 kHz.
It integrates an active discharge transistor (RDCH = 100 Ω typical) that pulls VOUT to GND during shutdown (SHDN = GND), preventing residual voltage hold-up in downstream circuitry. Shutdown current is 10 nA typical, supporting multi-year battery life in intermittently active devices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.2 V ±4% - ensures precise biasing for low-voltage MCUs and analog sensors without external resistors. |
| Max Output Current | 300 mA - supports higher peak loads than 150 mA variants (e.g., MCP1811X), enabling single-rail power for mixed-signal SoCs. |
| Quiescent Current | 250 nA typical - enables >10-year battery life in 10 µA average-load applications using a 220 mAh coin cell. |
| Input Voltage Range | 1.8 V to 5.5 V - compatible with single-cell Li-ion, LiFePO₄, alkaline, and energy-harvesting sources. |
| Dropout Voltage | 400 mV typical at 300 mA - allows regulation from 1.6 V input (1.2 V + 0.4 V), maximizing usable battery capacity. |
| Output Capacitor | 2.2 µF ceramic (X7R) - eliminates need for bulk electrolytic caps; reduces ESR-related noise and improves transient response. |
| Shutdown Current | 10 nA typical - meets ISO/IEC 14543-3-10 energy-harvesting node requirements for ultra-deep sleep states. |
Pinout & Package
Package: 4-lead 1×1 mm UDFN with exposed thermal pad (EP), optimized for space-constrained wearables and implantable-grade PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply | Accepts 1.8–5.5 V; requires local 1 µF ceramic bypass capacitor near pin for stability and noise suppression. |
| SHDN | Active-low enable/disable control | Pulled high internally; driven low to enter 10 nA shutdown mode with VOUT discharge enabled. |
| VOUT | Regulated 1.2 V output | Delivers up to 300 mA; requires ≥2.2 µF X7R ceramic capacitor with low ESR for loop stability. |
| GND | Ground reference | Must connect directly to quiet ground plane; ties return path for both input and output capacitors. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 250 nA typical operation enables >10-year runtime on CR2032 in sensor nodes with 1-second wake cycles. |
| Integrated output discharge | 100 Ω discharge transistor actively pulls VOUT to GND during shutdown, eliminating hold-up voltage in downstream logic. |
| Ceramic-capacitor stability | Stable with only 2.2 µF X7R ceramic output cap - reduces BOM count, footprint, and aging drift vs. tantalum/electrolytic. |
| Wide input range | 1.8–5.5 V operation supports direct connection to harvested energy sources (e.g., solar, RF, thermal) without pre-regulation. |
| Low-noise regulation | 169.31 µVrms integrated noise (10 Hz–100 kHz) minimizes interference in precision analog front-ends and ADC references. |
Applications
| Wearable Health Monitors | Energy-Harvesting Sensor Nodes |
|---|---|
|
Use Scenario: Continuous ECG/PPG sensing in smart patches powered by thin-film batteries or micro-solar cells. IC Role / Device Role / Timing Role: Primary 1.2 V supply for ultra-low-power MCU and analog signal chain; regulates during intermittent 300 mA LED/ADC bursts. Use Value: 250 nA IQ extends battery life beyond 3 years; 2.2 µF ceramic cap enables <1.5 mm² layout area per rail. |
Use Scenario: Wireless temperature/humidity node harvesting microwatts from ambient light or vibration. IC Role / Device Role / Timing Role: Stable 1.2 V rail for sub-1 µA sleep-mode MCU and 10 µA transmit bursts; handles variable input from harvester output. Use Value: 1.8 V min input allows direct use of unregulated harvester output; 10 nA shutdown prevents leakage drain during idle periods. |
| Hearing Aid Front-Ends | Smart Card Secure Elements |
|
Use Scenario: Powering MEMS microphone preamp and low-noise ADC in Class I hearing aids with zinc-air batteries. IC Role / Device Role / Timing Role: Low-noise 1.2 V analog supply; maintains regulation during rapid load transients from audio processing blocks. Use Value: 169 µVrms noise avoids audible artifacts; 400 mV dropout preserves >90% of zinc-air battery energy down to 1.6 V. |
Use Scenario: Providing certified 1.2 V core voltage to secure crypto ICs in contactless payment cards with strict leakage limits. IC Role / Device Role / Timing Role: Always-on regulated supply with guaranteed 10 nA shutdown current during card sleep states. Use Value: Output discharge prevents residual VOUT from powering unauthorized circuits; ±4% tolerance meets ISO/IEC 7816-3 voltage compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1812AT-012/OT | Same electrical specs and 3-lead SOT-23 package; no exposed thermal pad; higher θJA (211°C/W vs. 91°C/W). | Less effective thermal dissipation in high-ambient or continuous 300 mA operation; suitable for lower duty-cycle use. | Select when board space permits larger SOT-23 and thermal performance margin is acceptable. |
| Torex XC6210B122MR-G | 1.2 V, 300 mA, 250 nA IQ, but no output discharge; shutdown current 1 nA (lower), PSRR –45 dB at 1 kHz. | Lacks active VOUT discharge - requires external circuitry for hold-up prevention in safety-critical designs. | Choose where lowest shutdown IQ is critical and discharge is managed externally or unnecessary. |
Compared with MCP1812AT-012/OT, the /LB variant offers superior thermal performance in compact layouts; versus XC6210B122MR-G, it provides integrated discharge for simplified system-level safety compliance - making MCP1812AT-012/LB optimal for space- and safety-constrained ultra-low-power designs.
Availability
MCP1812AT-012/LB is available at Aetrix Electronics and suitable for wearable electronics, medical sensors, and energy-harvesting IoT nodes requiring stable component supply across multi-year production cycles.
Supply support for MCP1812AT-012/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 Inc. is a leading provider of microcontrollers, analog components, and Flash-IP solutions, serving automotive, industrial, and consumer markets with high-reliability silicon.
The MCP181X/12X family was designed specifically for ultra-low-power, long-life battery applications - emphasizing nanoscale quiescent current, ceramic-capacitor compatibility, and integrated discharge to eliminate external components in space-constrained edge devices.
FAQ
What is the maximum continuous output current of the MCP1812AT-012/LB?
The MCP1812AT-012/LB delivers up to 300 mA continuously under specified thermal conditions (TA ≤ +85°C, θJA = 91.05°C/W on JEDEC 4-layer board). This is double the 150 mA capability of MCP1811X variants and enables single-LDO power for higher-performance sensor subsystems without derating.
Does the MCP1812AT-012/LB require an external resistor network to set its output voltage?
No - the MCP1812AT-012/LB is a fixed-output device with factory-trimmed 1.2 V regulation (±4%). It contains no feedback pins or external resistor connections; output voltage is permanently configured during wafer test and does not require external components for adjustment.
How does the output discharge function operate in the MCP1812AT-012/LB?
The MCP1812AT-012/LB integrates an NMOS discharge transistor (RDCH = 100 Ω typical) between VOUT and GND. When SHDN is pulled low, this transistor activates, discharging the output capacitor to <100 mV within microseconds - preventing unintended wake-up or latch-up in downstream circuitry during standby.
What is the minimum input voltage required for regulation at full 300 mA load?
At 300 mA load, the MCP1812AT-012/LB requires VIN ≥ 1.6 V to maintain regulation (1.2 V + 400 mV typical dropout). The datasheet specifies minimum VIN = 2.4 V for full 300 mA operation across temperature, ensuring margin for worst-case dropout and line regulation.
Which package type does the /LB suffix indicate for the MCP1812AT-012/LB?
The /LB suffix denotes the 4-lead 1×1 mm UDFN package with exposed thermal pad (EP), per Microchip's standard ordering code. This package provides the lowest thermal resistance (θJA = 91.05°C/W) in the MCP1812X family and is optimized for high-density, thermally constrained PCBs.
MCP1812AT-012/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):
- 1.2V
- 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:
- SC-70-3
MCP1812AT-012/LB FAQ
1.How can I place an order for MCP1812AT-012/LB through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1812AT-012/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-012/LB reliable?
The price and inventory of MCP1812AT-012/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-012/LB is usually 5 days.
3.What payment methods are accepted for MCP1812AT-012/LB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1812AT-012/LB transactions.
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4.How is shipping managed for MCP1812AT-012/LB?
MCP1812AT-012/LB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1812AT-012/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-012/LB?
For technical support, including MCP1812AT-012/LB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1812AT-012/LB requirements.
6.How does Aetrix verify that MCP1812AT-012/LB is sourced from the original manufacturer or authorized distributors?
All MCP1812AT-012/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-012/LB meets industry standards.
7.What is the process for return or replacement of MCP1812AT-012/LB?
All MCP1812AT-012/LB units undergo pre-shipment inspection (PSI). If there is an issue with MCP1812AT-012/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-012/LB part is unused and in its original packaging.
Return procedure for MCP1812AT-012/LB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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