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Texas Instruments LP2981A-28DBVRG4
- Part No.:
- LP2981A-28DBVRG4
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LP2981A-28DBVRG4.pdf
- Description:
- IC REG LINEAR 2.8V 100MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,269
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Product details
Overview
LP2981A-28DBVRG4 from Texas Instruments is a 2.8 V, 100-mA ultra-low dropout linear regulator in SOT-23-5 package with shutdown control, ±0.75% output tolerance (A-grade), 200 mV typical dropout at 100 mA, and 600 µA typical quiescent current - deployed in mobile phones, digital cameras, and PDAs for stable low-voltage rail generation.
For engineers reviewing the LP2981A-28DBVRG4 datasheet, LP2981A-28DBVRG4 pinout, LP2981A-28DBVRG4 application, or LP2981A-28DBVRG4 equivalent, key selection considerations include dropout voltage under load, shutdown leakage (<0.01 µA), thermal protection behavior, input voltage range (2.2–16 V), and SOT-23-5 PCB layout compatibility.
Technical Context
The LP2981A-28DBVRG4 uses a PNP pass transistor architecture enabling ultra-low dropout (7 mV at 1 mA, 200 mV at 100 mA) and high peak current capability (150 mA). Its internal reference is trimmed to 1.23 V, feeding an error amplifier that drives the pass element via feedback from R1/R2 network - though fixed 2.8 V output eliminates external resistor need.
Shutdown is implemented via active-low ON/OFF pin (logic threshold: ≤0.15 V for OFF, ≥1.6 V for ON), drawing only 0.01 µA in shutdown. The device integrates overcurrent and thermal foldback protection, and requires minimum 3.3 µF output capacitance with specified ESR for stability across –40°C to 125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8 V ±0.75% (A-grade) - ensures tight regulation for sensitive 2.8 V logic or analog rails without external feedback components. |
| Max Output Current | 100 mA continuous - supports moderate-power microcontrollers, sensors, or RF front-end biasing in portable systems. |
| Dropout Voltage | 200 mV typical at 100 mA - enables operation with VIN as low as 3.0 V, critical for single-cell Li-ion or Li-poly battery applications. |
| Quiescent Current | 600 µA typical at full load - minimizes standby power loss while maintaining fast transient response. |
| Shutdown Current | 0.01 µA typical - extends battery life during system sleep modes without requiring external disconnect switches. |
| Input Voltage Range | 2.2 V to 16 V - accommodates wide input sources including multi-cell batteries, USB, and unregulated DC adapters. |
| Operating Temperature | –40°C to +125°C - qualified for automotive cabin, industrial, and extended-temperature portable environments. |
Pinout & Package
SOT-23-5 (DBV) package: 2.92 mm × 1.6 mm × 1.1 mm body, surface-mount, RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input supply connection | Accepts 2.2–16 V; internal parasitic diode anode - requires Schottky clamp if VOUT may exceed VIN. |
| 2 (GND) | Ground reference | Analog ground return for regulator core and feedback; must be low-impedance path to minimize noise coupling. |
| 3 (ON/OFF) | Active-low enable control | Pulled low (≤0.15 V) disables output; pulled high (≥1.6 V) enables; must be actively terminated - connect to VIN if unused. |
| 4 (NC) | No-connect terminal | Internally unconnected; must remain floating - no trace, pad, or solder mask relief required. |
| 5 (VOUT) | Regulated output | Delivers 2.8 V ±0.75%; requires ≥3.3 µF output capacitor with controlled ESR for stability across temperature. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 200 mV at 100 mA load enables use with single-cell Li-ion (3.0–4.2 V) without headroom loss. |
| A-grade precision | ±0.75% output tolerance over –40°C to 125°C reduces need for post-regulation trimming in production test. |
| Integrated shutdown | 0.01 µA shutdown current allows deep-sleep operation in battery-powered devices without external FETs. |
| Thermal & overcurrent protection | Foldback current limiting and thermal shutdown prevent damage during sustained overload or poor heatsinking. |
| Stable with ceramic-compatible ESR | Supports solid tantalum or aluminum electrolytic capacitors meeting min-ESR curves - avoids instability from ultra-low-ESR ceramics. |
Applications
| Mobile Phone Power Management | Digital Camera Sensor Bias |
|---|---|
|
Use Scenario: Supplies 2.8 V to image sensor analog front-end and ISP core in compact smartphone modules. IC Role / Device Role / Timing Role: Primary LDO delivering clean, low-noise 2.8 V rail with fast load transient response to pixel readout bursts. Use Value: 160 µV RMS output noise and 63 dB ripple rejection suppress switching noise from adjacent DC/DC converters. |
Use Scenario: Powers CMOS image sensor I/O and analog circuitry in handheld digital cameras with auto-focus and video capture. IC Role / Device Role / Timing Role: Fixed-output LDO providing stable 2.8 V for sensor bias and ADC reference, enabled only during active imaging. Use Value: Shutdown current <0.01 µA extends standby time between shots; 200 mV dropout preserves runtime as battery discharges to 3.0 V. |
| PDA Core Logic Supply | Bluetooth Audio Module Rail |
|
Use Scenario: Generates 2.8 V for ARM-based PDA application processor I/O and memory interface in space-constrained designs. IC Role / Device Role / Timing Role: Low-quiescent-current LDO supporting dynamic voltage scaling and deep-sleep states in portable computing. Use Value: 600 µA IQ at full load balances efficiency and transient performance; SOT-23-5 footprint saves board area vs. larger packages. |
Use Scenario: Supplies 2.8 V to Bluetooth audio SoC RF section and DAC in wireless earbuds and speaker modules. IC Role / Device Role / Timing Role: Shutdown-controlled LDO activated only during audio streaming to minimize average power draw. Use Value: Fast ON/OFF transition (≥40 mV/µs slew rate) prevents pop/click artifacts; thermal protection guards against enclosure overheating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV70228DBVR | 2.8 V, 300 mA, 220 mV dropout at 300 mA, 25 µA IQ, no shutdown pin - uses NMOS pass device. | Lacks dedicated ON/OFF control; higher max current but higher dropout at 100 mA (220 mV vs. 200 mV). | Choose TLV70228DBVR when higher output current or lower quiescent current is prioritized over shutdown functionality. |
| TPS78028QDRVRQ1 | Automotive-grade 2.8 V, 150 mA, 250 mV dropout at 150 mA, 0.5 µA IQ, integrated enable - AEC-Q100 qualified. | Qualified for automotive (-40°C to +125°C), higher reliability screening, but larger SOT-23-6 package and higher cost. | Choose TPS78028QDRVRQ1 for automotive infotainment or ADAS modules requiring ASIL-B compliance and extended lifetime. |
Compared with TLV70228DBVR and TPS78028QDRVRQ1, the LP2981A-28DBVRG4 delivers optimal balance of ultra-low dropout, A-grade precision, and integrated shutdown in the smallest SOT-23-5 footprint - making it ideal for cost-sensitive, space-constrained portable consumer electronics where 100 mA is sufficient.
Availability
LP2981A-28DBVRG4 is available at Aetrix Electronics and suitable for mobile phones, digital cameras, PDAs, and Bluetooth audio modules requiring stable component supply with consistent parametric performance and long-term manufacturability.
Supply support for LP2981A-28DBVRG4 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, embedded processing, and connectivity technologies with over 50 years of power management leadership.
The LP2981A-28DBVRG4 belongs to TI's ultra-low dropout LDO family designed specifically for portable battery-powered applications demanding high accuracy, low quiescent current, and minimal board space.
FAQ
What is the output voltage tolerance of the LP2981A-28DBVRG4?
The LP2981A-28DBVRG4 has a guaranteed output voltage tolerance of ±0.75% over the full operating temperature range (–40°C to +125°C), reflecting its A-grade specification. This tighter tolerance compared to the standard-grade LP2981-28DBVRG4 (±1.25%) reduces system-level calibration requirements and improves voltage margin for 2.8 V logic interfaces.
Does the LP2981A-28DBVRG4 require an external pull-up on the ON/OFF pin?
Yes - the ON/OFF pin of the LP2981A-28DBVRG4 is active-low and must be actively terminated. If shutdown functionality is not used, TI specifies connecting the ON/OFF pin directly to VIN to ensure reliable turn-on. Leaving it floating may cause erratic enable behavior due to noise susceptibility.
Can I use a ceramic capacitor for the output of the LP2981A-28DBVRG4?
No - the LP2981A-28DBVRG4 requires a minimum ESR at the output for stability, and standard ceramic capacitors have ESR too low (typically 10–20 mΩ). Using one without series resistance risks oscillation. TI recommends solid tantalum or aluminum electrolytic capacitors meeting the specified ESR vs. load current curves, or adding a 1 Ω resistor in series with a ceramic cap.
What is the maximum input voltage rating for the LP2981A-28DBVRG4?
The absolute maximum input voltage for the LP2981A-28DBVRG4 is 16 V, and the recommended operating range is 2.2 V to 16 V. The 2.2 V minimum ensures proper biasing of the internal control circuitry; operation below this may result in unregulated output or failure to start.
Is pin 4 (NC) on the LP2981A-28DBVRG4 required to be grounded or left open?
Pin 4 on the LP2981A-28DBVRG4 is designated NC (No Connect) and must be left electrically open - no connection to ground, power, or any other net. TI explicitly states it must be left open; routing a trace or applying solder paste to this pad violates the device's validated design and may impact yield or reliability.
LP2981A-28DBVRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- 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):
- 16V
- Voltage - Output (Min/Fixed):
- 2.8V
- 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-28DBVRG4 FAQ
1.How can I place an order for LP2981A-28DBVRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2981A-28DBVRG4 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-28DBVRG4 reliable?
The price and inventory of LP2981A-28DBVRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP2981A-28DBVRG4 is usually 5 days.
3.What payment methods are accepted for LP2981A-28DBVRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2981A-28DBVRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2981A-28DBVRG4?
LP2981A-28DBVRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2981A-28DBVRG4 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-28DBVRG4?
For technical support, including LP2981A-28DBVRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2981A-28DBVRG4 requirements.
6.How does Aetrix verify that LP2981A-28DBVRG4 is sourced from the original manufacturer or authorized distributors?
All LP2981A-28DBVRG4 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-28DBVRG4 meets industry standards.
7.What is the process for return or replacement of LP2981A-28DBVRG4?
All LP2981A-28DBVRG4 units undergo pre-shipment inspection (PSI). If there is an issue with LP2981A-28DBVRG4, 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-28DBVRG4 part is unused and in its original packaging.
Return procedure for LP2981A-28DBVRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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