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Microchip Technology MCP1812BT-018/LB
- Part No.:
- MCP1812BT-018/LB
- Manufacturer:
- Microchip Technology
- Package:
- SC-70, SOT-323
- Datasheet:
-
MCP1812BT-018/LB.pdf
- Description:
- IC REG LINEAR 1.8V 300MA SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,074
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Product details
Overview
MCP1812BT-018/LB from Microchip Technology is a 300 mA ultra-low-quiescent-current LDO linear regulator with fixed 1.8 V output, 250 nA typical operating current, and shutdown capability down to 5 nA (typical). It operates from 1.8 V to 5.5 V input and supports ceramic output capacitors as small as 2.2 µF - designed for energy harvesting nodes and long-life battery-powered medical wearables.
For engineers reviewing the MCP1812BT-018/LB datasheet, MCP1812BT-018/LB pinout, MCP1812BT-018/LB application, or MCP1812BT-018/LB equivalent, key selection criteria include its 1.8 V fixed output, 300 mA load capability, 400 mV dropout at full load, output discharge function (MCP1812A variant), and compatibility with 1×1 mm UDFN-4 packaging.
Technical Context
The MCP1812BT-018/LB implements a PMOS pass transistor architecture enabling ultra-low quiescent current and low dropout voltage. Its internal error amplifier maintains ±4% output regulation over load (0–300 mA), line (1.8–5.5 V), and temperature (−40°C to +85°C) variations.
It integrates overcurrent protection with foldback limiting (100 mA at RLOAD = 1 Ω), a dedicated SHDN pin with 70% VIN logic-high threshold, and an output discharge transistor (RDCH = 100 Ω) active during shutdown - confirming it belongs to the MCP1812A subfamily per Table 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±4% - ensures stable supply for 1.8 V logic rails (e.g., microcontrollers, sensors) without external feedback. |
| Max Output Current | 300 mA continuous - supports higher-power peripherals (e.g., BLE radios, display drivers) in compact wearable designs. |
| Quiescent Current | 250 nA typical - enables multi-year operation on coin cells (e.g., CR2032) in sleep-dominated duty cycles. |
| Shutdown Current | 5 nA typical - reduces system standby power to near-zero when host MCU asserts SHDN = GND. |
| Dropout Voltage | 400 mV at 300 mA - allows regulation from 2.2 V input (e.g., single Li-SOCl₂ cell or partially discharged alkaline). |
| Stability Capacitor | 2.2 µF ceramic (X7R) - enables small footprint, low-ESR, low-noise output filtering without tantalum or electrolytic parts. |
| PSRR | −50 dB @ 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 space-constrained PCBs and thermal performance on 4-layer boards (θJA = 91.05°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply | Accepts 1.8–5.5 V; requires local 1 µF ceramic bypass capacitor close to pin for stability and transient response. |
| SHDN | Active-low enable/shutdown control | Pulled high internally; driven low (<20% VIN) to enter 5 nA shutdown mode with output discharge enabled. |
| VOUT | Regulated 1.8 V output | Delivers up to 300 mA; connects directly to load and 2.2 µF ceramic output capacitor (X7R, ≥6.3 V rating). |
| GND | Ground reference | Low-impedance return path for load and regulator ground current; must connect to quiet ground plane near output capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ (250 nA) | Extends battery life in intermittent-sensing applications (e.g., environmental monitors logging every 10 minutes). |
| Output discharge on shutdown | Drains VOUT capacitance via 100 Ω internal switch - prevents residual voltage from interfering with downstream reset sequencing. |
| Stable with 2.2 µF ceramic cap | Eliminates need for larger, less reliable electrolytic/tantalum caps - reduces BOM count and board area by >30% vs legacy LDOs. |
| Wide input range (1.8–5.5 V) | Supports direct connection to single-cell batteries (LiFePO₄, Alkaline, NiMH) without pre-regulation stages. |
| Overcurrent foldback | Limits short-circuit power dissipation to safe levels (100 mA at 1 Ω load), preventing thermal runaway during fault conditions. |
Applications
| Energy Harvesting Node | Wearable Medical Sensor |
|---|---|
Use Scenario: Indoor light-harvesting sensor node powering a low-power MCU and BLE transmitter using a 2.2 V amorphous silicon solar cell. IC Role / Device Role / Timing Role: Primary voltage regulator converting variable 1.8–3.0 V harvested voltage to stable 1.8 V for digital core and RF interface. Use Value: 250 nA quiescent current minimizes drain during dark periods; 2.2 µF ceramic stability enables ultra-thin flexible PCB integration. |
Use Scenario: Hearing aid with rechargeable Li-ion battery and real-time audio processing ASIC requiring clean 1.8 V supply. IC Role / Device Role / Timing Role: Low-noise post-regulator delivering regulated 1.8 V to analog front-end and DSP, synchronized to MCU sleep/wake cycles. Use Value: −50 dB PSRR at 1 kHz suppresses switching noise from charging IC; 5 nA shutdown extends runtime between charges. |
| Smart Card Reader | Industrial IoT Edge Node |
Use Scenario: Contactless smart card reader powered by USB bus (5 V) but required to operate at 1.8 V logic level for ISO/IEC 14443-A compliance. IC Role / Device Role / Timing Role: Fixed-output LDO stepping down USB 5 V to precise 1.8 V for NFC controller and secure element. Use Value: 400 mV dropout enables full 1.8 V regulation even as USB voltage sags under load; ±4% tolerance meets NFC timing margin requirements. |
Use Scenario: Battery-backed industrial sensor node monitoring temperature/humidity in remote locations, transmitting data hourly via LoRaWAN. IC Role / Device Role / Timing Role: Main power regulator supplying 1.8 V to MCU, LoRa transceiver, and precision ADC during active measurement bursts. Use Value: 300 mA output supports simultaneous radio transmit + sensor readout; output discharge ensures clean power-down before deep sleep. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6219B182MR-G | 180 mA max output, 1.0 µF min COUT, no output discharge, 250 nA IQ | Limited to lower-current peripherals; lacks discharge function for reset-critical systems | Select when cost-sensitive and discharge not required; verify 180 mA suffices for peak load. |
| Ricoh RP114K181D-TR-F | 200 mA max output, 1.0 µF min COUT, 300 nA IQ, no discharge, SOT-23-5 package | Higher quiescent current and lower output current; larger footprint than UDFN-4 | Choose if SOT-23-5 layout exists and 200 mA load ceiling is acceptable; avoid for space-constrained wearables. |
Compared with XC6219B182MR-G and RP114K181D-TR-F, the MCP1812BT-018/LB delivers 50% higher output current in a smaller 1×1 mm UDFN package while retaining ultra-low IQ and adding output discharge - making it optimal for next-gen compact, long-life battery systems where both peak power and graceful shutdown matter.
Availability
MCP1812BT-018/LB is available at Aetrix Electronics and suitable for energy harvesting nodes, wearable medical sensors, and smart card readers requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MCP1812BT-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 Inc. is a leading provider of microcontroller, analog, FPGA, and connectivity solutions, serving automotive, industrial, consumer, and communications markets with vertically integrated silicon and software tools.
The MCP1811/12 family was engineered specifically for ultra-low-power, battery-critical applications - emphasizing 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 MCP1812BT-018/LB?
The MCP1812BT-018/LB has an absolute maximum input voltage rating of +6.0 V. Operation above 5.5 V violates the recommended operating conditions and may cause permanent damage. For reliable long-term use, keep VIN ≤ 5.5 V under all conditions, including transient spikes.
Does the MCP1812BT-018/LB support output discharge during shutdown?
Yes, the MCP1812BT-018/LB supports output discharge during shutdown. As confirmed in Table 1 of DS20006088C, the "BT" suffix denotes the MCP1812A variant, which includes an internal discharge transistor (RDCH = 100 Ω) that actively pulls VOUT to GND when SHDN is driven low.
What is the minimum output capacitor value required for stability with the MCP1812BT-018/LB?
The MCP1812BT-018/LB requires a minimum 2.2 µF X7R ceramic output capacitor for guaranteed stability. This value is specified in the Features section and Electrical Characteristics table for MCP1812X devices - distinct from the 1.0 µF requirement for MCP1811X variants.
Can the MCP1812BT-018/LB be used with a 1.5 V input supply?
No. The MCP1812BT-018/LB has a minimum input voltage of 1.8 V per its Absolute Maximum Ratings and Electrical Characteristics tables. At 1.5 V input, the device will not regulate - output collapses below 1.8 V, and internal circuitry may not power up reliably.
What package type does the MCP1812BT-018/LB use, and is thermal pad connection required?
The MCP1812BT-018/LB uses the 4-Lead 1 × 1 mm UDFN package with an exposed thermal pad (EP). Per Table 3-1 and thermal resistance data, the EP must be soldered to a PCB thermal pad with ≥4 thermal vias to achieve the rated θJA = 91.05°C/W and prevent thermal shutdown under 300 mA load.
MCP1812BT-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
MCP1812BT-018/LB FAQ
1.How can I place an order for MCP1812BT-018/LB through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1812BT-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 MCP1812BT-018/LB reliable?
The price and inventory of MCP1812BT-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 MCP1812BT-018/LB is usually 5 days.
3.What payment methods are accepted for MCP1812BT-018/LB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1812BT-018/LB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1812BT-018/LB?
MCP1812BT-018/LB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1812BT-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 MCP1812BT-018/LB?
For technical support, including MCP1812BT-018/LB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1812BT-018/LB requirements.
6.How does Aetrix verify that MCP1812BT-018/LB is sourced from the original manufacturer or authorized distributors?
All MCP1812BT-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 MCP1812BT-018/LB meets industry standards.
7.What is the process for return or replacement of MCP1812BT-018/LB?
All MCP1812BT-018/LB units undergo pre-shipment inspection (PSI). If there is an issue with MCP1812BT-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 MCP1812BT-018/LB part is unused and in its original packaging.
Return procedure for MCP1812BT-018/LB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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