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Texas Instruments LP2981A-50DBVRG4
- Part No.:
- LP2981A-50DBVRG4
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LP2981A-50DBVRG4.pdf
- Description:
- IC REG LINEAR 5V 100MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,829
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Product details
Overview
LP2981A-50DBVRG4 from Texas Instruments is a 5.0 V fixed-output, ultra-low dropout linear regulator with 100 mA output capability, ±0.75% output voltage tolerance (A-grade), 200 mV typical dropout at full load, and active-low shutdown control via the ON/OFF pin - used in precision power rails for portable audio, smart meters, and motor control subsystems.
For engineers reviewing the LP2981A-50DBVRG4 datasheet, LP2981A-50DBVRG4 pinout, LP2981A-50DBVRG4 application, or LP2981A-50DBVRG4 equivalent, key selection criteria include guaranteed 5.0 V output accuracy over –40°C to 125°C, shutdown current ≤0.01 µA, thermal/overcurrent protection, and SOT-23-5 package compatibility with space-constrained PCB layouts.
Technical Context
The LP2981A-50DBVRG4 employs a vertical PNP pass transistor architecture enabling ultra-low dropout (7 mV at 1 mA, 200 mV at 100 mA) and low ground current (600 µA typical at full load). Its internal reference is trimmed to 1.23 V, feeding an error amplifier that regulates output via external R1/R2 feedback - though for fixed-output variants like LP2981A-50DBVRG4, this network is internal.
It integrates overcurrent and thermal shutdown protection with foldback current limiting, and requires stable output capacitance (≥3.3 µF, 1–10 Ω ESR) using tantalum or aluminum electrolytic capacitors - ceramic capacitors require series resistance to meet minimum ESR requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±0.75% at 25°C (A-grade); maintains regulation across –40°C to 125°C ambient |
| Max Output Current | 100 mA continuous; peak output current up to 400 mA (transient) |
| Dropout Voltage | 200 mV typical at 100 mA load; enables operation with VIN as low as 5.2 V |
| Quiescent Current | 600 µA typical at full 100 mA load; 65 µA at 1 mA load |
| Shutdown Current | 0.01 µA typical when ON/OFF pin ≤0.3 V; enables battery-critical low-power states |
| Ripple Rejection | 63 dB at 1 kHz; suppresses input supply noise in sensitive analog/audio stages |
| Operating Input Range | 2.2 V to 16 V; minimum 2.2 V required for internal bias circuitry functionality |
Pinout & Package
SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body, 0.95 mm max height, gull-wing leads, RoHS-compliant, tape-and-reel packaging (DBVRG4 suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Input supply connection | Accepts 2.2–16 V DC; must be decoupled with ≥1 µF capacitor within 1 cm of pin |
| 2 - GND | Ground reference | Primary return path for load and quiescent current; connects to low-impedance analog ground plane |
| 3 - ON/OFF | Active-low enable control | Pulled low (≤0.3 V) disables regulator; pulled high (≥1.6 V) enables; tie to VIN if unused |
| 4 - NC | No-connect terminal | Internally unconnected; must remain floating - no trace, pad, or component attachment |
| 5 - VOUT | Regulated output | Delivers stable 5.0 V ±0.75%; requires ≥3.3 µF output capacitor with 1–10 Ω ESR |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 200 mV at 100 mA enables use with minimal input headroom - critical for single-cell Li-ion or multi-rail systems |
| A-grade output accuracy | ±0.75% tolerance ensures compliance with tight 5.0 V logic supply specs (e.g., USB PHY, microcontroller I/O) |
| Low shutdown current | 0.01 µA allows >10-year battery life in always-on monitoring applications (e.g., smart meter backup rail) |
| Integrated protection | Thermal shutdown + foldback current limiting prevents damage during overload or short-circuit events |
| Stable with standard capacitors | Validated with 3.3–10 µF tantalum or aluminum electrolytic caps - avoids costly low-ESR ceramic + resistor networks |
Applications
| Smart Meters | Portable Audio Systems |
|---|---|
Use Scenario: Powering metrology ICs, RTCs, and communication modules in battery-backed utility meters. IC Role / Device Role / Timing Role: Primary 5.0 V LDO supplying precision ADC reference and isolated RS-485 transceivers. Use Value: 0.75% output tolerance ensures accurate energy measurement; 0.01 µA shutdown extends 10-year battery life. |
Use Scenario: Regulating 5.0 V rail for DACs, headphone amplifiers, and Bluetooth audio SoCs in wireless speakers. IC Role / Device Role / Timing Role: Low-noise post-regulator cleaning noisy switcher outputs before analog signal paths. Use Value: 160 µV RMS noise (300 Hz–50 kHz) and 63 dB PSRR preserve audio SNR; SOT-23-5 saves board space. |
| Servo Motor Control | Industrial Sensor Nodes |
Use Scenario: Providing clean 5.0 V supply to position encoder interfaces and microcontroller peripherals in compact servo drives. IC Role / Device Role / Timing Role: Local LDO isolating digital logic from high-current motor switching noise. Use Value: Fast transient response handles encoder pulse bursts; thermal protection prevents fault propagation during stall conditions. |
Use Scenario: Powering MEMS accelerometers, temperature sensors, and LoRaWAN transceivers in remote condition-monitoring nodes. IC Role / Device Role / Timing Role: Always-on 5.0 V regulator supporting wake-on-event operation with sub-µA standby. Use Value: 65 µA quiescent current at 1 mA load enables multi-year operation on coin cells; –40°C to 125°C rating suits harsh environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP2981-50DBVR | Standard grade (±1.25% output tolerance); same pinout, package, and electrical specs except accuracy | Acceptable where 5.0 V ±1.25% meets system margin (e.g., non-precision digital I/O rails) | Select LP2981-50DBVR only if A-grade accuracy is not required - lower cost, identical footprint |
| MCP1700T-5002E/TT | 250 mA output, 6 µA quiescent current, but higher 600 mV dropout at full load; SOT-23-5 compatible | Better for ultra-low IQ battery apps, but unsuitable where VIN < 5.6 V due to higher dropout | Choose MCP1700T-5002E/TT only when >100 mA load or <6 µA IQ is mandatory - verify dropout margin at min VIN |
Compared with LP2981-50DBVR, the LP2981A-50DBVRG4 delivers tighter output accuracy critical for analog-sensitive loads; versus MCP1700T-5002E/TT, it trades higher quiescent current for significantly lower dropout and proven stability with standard tantalum capacitors.
Availability
LP2981A-50DBVRG4 is available at Aetrix Electronics and suitable for smart metering, portable audio, and industrial sensor node designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant SOT-23 packaging.
Supply support for LP2981A-50DBVRG4 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
Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in power management ICs for industrial, automotive, and consumer applications.
The LP2981A family was designed specifically for ultra-low dropout, high-accuracy regulation in space- and power-constrained portable and industrial systems - emphasizing thermal robustness, shutdown efficiency, and capacitor flexibility.
FAQ
What is the output voltage tolerance of the LP2981A-50DBVRG4 over temperature?
The LP2981A-50DBVRG4 guarantees ±0.75% output voltage tolerance at 25°C and ±2.5% over the full –40°C to 125°C operating junction temperature range. This A-grade specification ensures reliable 5.0 V regulation for precision analog circuits even under thermal stress.
Can the LP2981A-50DBVRG4 operate with a 5.1 V input supply?
Yes - the LP2981A-50DBVRG4 supports input voltages as low as 2.2 V and as high as 16 V. With a 5.1 V input, the 200 mV typical dropout allows stable 5.0 V output at up to 100 mA load, provided thermal limits are observed per the 205.2°C/W junction-to-ambient rating.
Is a capacitor required on the ON/OFF pin of the LP2981A-50DBVRG4?
No external capacitor is required on the ON/OFF pin of the LP2981A-50DBVRG4. The pin accepts standard logic-level signals: drive it low (≤0.3 V) to disable, high (≥1.6 V) to enable. If unused, connect directly to VIN - do not leave floating.
What output capacitor types are recommended for the LP2981A-50DBVRG4?
Tantalum or aluminum electrolytic capacitors are recommended for the LP2981A-50DBVRG4, with minimum 3.3 µF capacitance and 1–10 Ω ESR. Ceramic capacitors require a 1 Ω series resistor to meet minimum ESR; avoid ceramics without this modification due to instability risk.
Does the LP2981A-50DBVRG4 include reverse-voltage protection?
No - the LP2981A-50DBVRG4 contains an inherent PNP parasitic diode from VOUT to VIN. If VOUT exceeds VIN by >0.7 V (e.g., during hot-swap or backup battery scenarios), forward conduction can occur. An external Schottky diode (anode to VOUT, cathode to VIN) is required to prevent damage.
LP2981A-50DBVRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.37V @ 100mA
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- 95 µA
- Current - Supply (Max):
- 1.7 mA
- PSRR:
- 63dB (1kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LP2981A-50DBVRG4 FAQ
1.How can I place an order for LP2981A-50DBVRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2981A-50DBVRG4 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 LP2981A-50DBVRG4 reliable?
The price and inventory of LP2981A-50DBVRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP2981A-50DBVRG4 is usually 5 days.
3.What payment methods are accepted for LP2981A-50DBVRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2981A-50DBVRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2981A-50DBVRG4?
LP2981A-50DBVRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2981A-50DBVRG4 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 LP2981A-50DBVRG4?
For technical support, including LP2981A-50DBVRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2981A-50DBVRG4 requirements.
6.How does Aetrix verify that LP2981A-50DBVRG4 is sourced from the original manufacturer or authorized distributors?
All LP2981A-50DBVRG4 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 LP2981A-50DBVRG4 meets industry standards.
7.What is the process for return or replacement of LP2981A-50DBVRG4?
All LP2981A-50DBVRG4 units undergo pre-shipment inspection (PSI). If there is an issue with LP2981A-50DBVRG4, 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 LP2981A-50DBVRG4 part is unused and in its original packaging.
Return procedure for LP2981A-50DBVRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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