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Microchip Technology MCP1811BT-028/OT
- Part No.:
- MCP1811BT-028/OT
- Manufacturer:
- Microchip Technology
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MCP1811BT-028/OT.pdf
- Description:
- IC REG LINEAR 2.8V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,518
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Product details
Overview
MCP1811BT-028/OT from Microchip Technology is an ultra-low quiescent current (250 nA typical) 150 mA low-dropout linear regulator with fixed 2.8 V output, designed for energy-constrained battery-powered systems. It operates from 1.8 V to 5.5 V input, supports ceramic output capacitors as small as 1.0 µF, and features overcurrent protection and shutdown mode with 5 nA typical supply current - ideal for wearable electronics and medical hearing aids.
For engineers reviewing the MCP1811BT-028/OT datasheet, MCP1811BT-028/OT pinout, MCP1811BT-028/OT application, or MCP1811BT-028/OT equivalent, key selection criteria include ultra-low IQ performance, 2.8 V fixed output stability under light-to-moderate load (≤150 mA), SOT-23-3 package compatibility, and shutdown discharge capability specific to the "A" variant - though this part is the "B" variant without discharge.
Technical Context
The MCP1811BT-028/OT belongs to the MCP1811B subfamily: a 150 mA LDO with no output discharge function and 5 nA typical shutdown current. Its internal architecture uses a PMOS pass element enabling ultra-low dropout (400 mV typical at 150 mA) and stable regulation across –40°C to +85°C junction temperature.
It requires no external compensation and achieves ±25 mV load regulation (1 mA to 150 mA) and ±20 mV line regulation (1.8 V < VIN < 5.5 V). The device delivers 2.8 V output with ±4% tolerance over temperature and load, and maintains PSRR of –50 dB at 1 kHz with no input capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8 V ±4% - ensures precise biasing for 2.8 V logic or analog rails without external feedback. |
| Max Output Current | 150 mA - sufficient for microcontrollers, sensors, and BLE radios in compact wearables. |
| Quiescent Current | 250 nA typical - enables multi-year battery life in sleep-mode-dominated applications. |
| Shutdown Current | 5 nA typical - minimizes leakage during system hibernation, critical for energy harvesting nodes. |
| Input Voltage Range | 1.8 V to 5.5 V - supports single-cell Li-ion, LiFePO₄, alkaline, or NiMH sources directly. |
| Dropout Voltage | 400 mV typical at 150 mA - allows regulation down to ~3.2 V input for 2.8 V output, maximizing usable battery range. |
| Stability | With ≥1.0 µF ceramic output capacitor - reduces BOM count and PCB area vs. tantalum or electrolytic solutions. |
Pinout & Package
Package: 3-Lead SOT-23 - surface-mount, 2.92 mm × 1.3 mm footprint, JEDEC standard, suitable for high-density portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply | Accepts 1.8–5.5 V unregulated input; connects to bulk capacitance and upstream power source. |
| VOUT | Regulated output | Delivers stable 2.8 V to load; requires ≥1.0 µF ceramic capacitor to GND for loop stability. |
| GND | Ground reference | Low-impedance return path for regulator ground current only; must tie to quiet ground plane near output capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ operation | 250 nA typical - extends shelf life and operational runtime in coin-cell-powered devices. |
| No output discharge | Disables automatic VOUT pull-down during shutdown - preserves state in systems requiring controlled power sequencing. |
| Ceramic-capacitor stability | Stable with 1.0 µF X7R - eliminates ESR requirements and simplifies layout in space-constrained wearables. |
| Overcurrent protection | 250 mA typical current limit - prevents thermal runaway during short-circuit or overload events. |
| Wide temperature range | –40°C to +85°C operating junction - validated for use in body-worn and ambient-exposed medical/end-user devices. |
Applications
| Smart Wearables | Hearing Aids |
|---|---|
Use Scenario: Powering ultra-low-power Bluetooth LE microcontrollers and MEMS sensors in smart wristbands. IC Role / Device Role / Timing Role: Primary 2.8 V supply rail regulator with sleep-mode IQ optimization. Use Value: Enables >3-year coin-cell lifetime by minimizing standby current while delivering full 150 mA peak for radio transmission. |
Use Scenario: Supplying ASICs and miniature audio amplifiers in rechargeable hearing aids. IC Role / Device Role / Timing Role: Main LDO for analog front-end and digital signal processor core voltage. Use Value: Maintains tight 2.8 V regulation across battery discharge curve (2.8–4.2 V), ensuring consistent audio fidelity and DSP performance. |
| Energy Harvesting Nodes | Smart Cards |
Use Scenario: Regulating output from thermoelectric or RF energy harvesters with intermittent, low-current sources. IC Role / Device Role / Timing Role: Low-input-voltage startup regulator enabling operation down to 1.8 V. Use Value: Starts up reliably at 1.8 V input and draws only 250 nA when idle - maximizes usable harvested energy per cycle. |
Use Scenario: Providing secure IC core voltage in contactless payment cards with NFC interface. IC Role / Device Role / Timing Role: Standby power regulator activated only during RF field coupling. Use Value: Draws just 5 nA in shutdown - preserves card battery charge during multi-year storage before first use. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1811AT-028/OT | Same 2.8 V output and 150 mA rating, but includes output discharge (DT transistor) active in shutdown. | Required where rapid VOUT discharge is needed to reset downstream logic or meet safety discharge standards. | Select if system demands controlled VOUT decay on shutdown; otherwise MCP1811BT-028/OT avoids unintended discharge. |
| Torex XC6210B282MR-G | 2.8 V, 150 mA, 250 nA IQ, SOT-23-3 - identical key specs but no shutdown pin; always-on operation. | Suitable for always-on sensor nodes where shutdown control is unnecessary and board space is constrained. | Choose when pin count reduction is prioritized and shutdown functionality is not required. |
Compared with MCP1811AT-028/OT, the MCP1811BT-028/OT eliminates output discharge to prevent unintended load reset; compared with XC6210B282MR-G, it adds active shutdown control for deeper system-level power management - making it optimal for duty-cycled, battery-sensitive applications.
Availability
MCP1811BT-028/OT is available at Aetrix Electronics and suitable for smart wearables, hearing aids, and energy harvesting nodes requiring stable component supply with long-lifecycle support and traceable sourcing.
Supply support for MCP1811BT-028/OT 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 mixed-signal semiconductors, headquartered in Chandler, Arizona.
The MCP1811X/12X product line was engineered specifically for ultra-low-power, long-life battery applications - emphasizing nanoscale quiescent current, minimal external components, and robust operation across consumer, medical, and industrial environments.
FAQ
What is the shutdown behavior of the MCP1811BT-028/OT?
The MCP1811BT-028/OT enters ultra-low-power shutdown when the SHDN pin is pulled low, drawing just 5 nA typical supply current. Unlike the "A" variant, it does not activate an internal discharge transistor - so VOUT remains floating and retains its voltage until discharged externally. This behavior is confirmed in Table 1 and Section 3.4 of DS20006088C.
Does the MCP1811BT-028/OT require an input capacitor?
The MCP1811BT-028/OT does not require an input capacitor for stability, as stated in the AC/DC Characteristics table (page 4) and Figure 2-16 through 2-19 PSRR plots. However, a 1 µF ceramic input capacitor is recommended to suppress high-frequency noise and improve transient response - especially when sourced from switching regulators or long traces.
Can the MCP1811BT-028/OT be used with a 1.0 µF output capacitor?
Yes - the MCP1811BT-028/OT is explicitly characterized and guaranteed stable with a minimum 1.0 µF ceramic (X7R) output capacitor, as specified in the Features list (page 1) and Electrical Characteristics table (page 4). This eliminates need for ESR tuning and reduces solution size versus traditional LDOs.
What is the maximum dropout voltage specification for the MCP1811BT-028/OT at full load?
The maximum dropout voltage for the MCP1811BT-028/OT is 600 mV at 150 mA output current and +25°C, per the Electrical Characteristics table (page 4). At worst-case conditions (–40°C to +85°C), dropout remains within spec - enabling reliable 2.8 V regulation down to ~3.4 V input across temperature.
Is the MCP1811BT-028/OT pin-compatible with other variants in the MCP1811X family?
Yes - the MCP1811BT-028/OT in SOT-23-3 shares identical pinout (VIN, VOUT, GND) and footprint with all 3-lead variants including MCP1811AT-028/OT and MCP1811CT-028/OT. Pin compatibility is confirmed in the Package Types diagram (page 2) and Table 3-1 (page 19), enabling drop-in replacement where functional differences (e.g., discharge) are acceptable.
MCP1811BT-028/OT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- 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):
- 2.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.6V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 0.5 µA
- Current - Supply (Max):
- 110 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:
- SOT-23-5
MCP1811BT-028/OT FAQ
1.How can I place an order for MCP1811BT-028/OT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1811BT-028/OT 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 MCP1811BT-028/OT reliable?
The price and inventory of MCP1811BT-028/OT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1811BT-028/OT is usually 5 days.
3.What payment methods are accepted for MCP1811BT-028/OT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1811BT-028/OT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1811BT-028/OT?
MCP1811BT-028/OT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1811BT-028/OT 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 MCP1811BT-028/OT?
For technical support, including MCP1811BT-028/OT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1811BT-028/OT requirements.
6.How does Aetrix verify that MCP1811BT-028/OT is sourced from the original manufacturer or authorized distributors?
All MCP1811BT-028/OT 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 MCP1811BT-028/OT meets industry standards.
7.What is the process for return or replacement of MCP1811BT-028/OT?
All MCP1811BT-028/OT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1811BT-028/OT, 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 MCP1811BT-028/OT part is unused and in its original packaging.
Return procedure for MCP1811BT-028/OT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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