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Texas Instruments LP2981A-28DBVRE4
- Part No.:
- LP2981A-28DBVRE4
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LP2981A-28DBVRE4.pdf
- Description:
- IC REG LINEAR 2.8V 100MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,822
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Product details
Overview
LP2981A-28DBVRE4 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 0.01 µA shutdown current - used for power management in mobile phones, PDAs, and digital cameras.
For engineers reviewing the LP2981A-28DBVRE4 datasheet, LP2981A-28DBVRE4 pinout, LP2981A-28DBVRE4 application, or LP2981A-28DBVRE4 equivalent, key selection criteria include dropout voltage at full load, shutdown quiescent current, output accuracy over temperature, and SOT-23-5 thermal performance in space-constrained portable designs.
Technical Context
The LP2981A-28DBVRE4 employs a PNP pass transistor architecture enabling ultra-low dropout operation and inherently low quiescent current. Its internal reference is trimmed to 1.23 V, and feedback is implemented via fixed-resistor divider integrated into the die for stable 2.8 V output.
It integrates overcurrent and thermal shutdown protection, supports fast transient response due to optimized loop compensation, and requires a minimum 3.3 µF output capacitor with specified ESR range to ensure stability across –40°C to 125°C operating junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.8 V nominal, ±0.75% tolerance over –40°C to 125°C - ensures precise rail regulation for sensitive analog/digital circuitry. |
| Max Output Current | 100 mA continuous - sufficient for powering microcontrollers, sensors, and RF front-ends in portable systems. |
| Dropout Voltage | 200 mV typical at 100 mA load - enables operation with minimal VIN–VOUT headroom, extending battery life in single-cell Li-ion or alkaline applications. |
| Quiescent Current | 600 µA typical at full load; 0.01 µA in shutdown - critical for low-power standby modes in always-on devices. |
| Input Voltage Range | 2.2 V to 16 V - accommodates wide input sources including boosted battery rails and unregulated adapters. |
| Line Regulation | 0.014%/V typical - maintains tight output stability despite input ripple or sag during battery discharge. |
| Ripple Rejection | 63 dB at 1 kHz - suppresses switching noise from upstream DC/DC converters feeding the LDO input. |
Pinout & Package
SOT-23-5 (DBV) package: 2.9 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 - reverse VIN–VOUT voltage requires external Schottky clamp. |
| 2 (GND) | Ground reference | Analog ground return for regulator control circuitry and feedback network; must be low-impedance path. |
| 3 (ON/OFF) | Shutdown control input | Active-low logic: ≤0.15 V disables output (0.01 µA IQ); ≥1.6 V enables; must be actively terminated. |
| 4 (NC) | No-connect terminal | Internally unconnected; must remain floating - soldering or routing to any net causes undefined behavior. |
| 5 (VOUT) | Regulated output | Delivers 2.8 V ±0.75%; requires ≥3.3 µF output capacitor with controlled ESR for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 200 mV at 100 mA enables use with single-cell batteries down to ~3.0 V while maintaining regulation. |
| A-grade precision | ±0.75% output tolerance over full temperature range reduces need for post-regulation trimming in production. |
| Integrated protection | Thermal shutdown and current limiting prevent damage during overload or ambient temperature excursions. |
| Low-noise operation | 160 µV RMS output noise (300 Hz–50 kHz) supports noise-sensitive analog signal chains without added filtering. |
| Small footprint | SOT-23-5 package occupies <5 mm² PCB area - ideal for compact handheld and wearable electronics. |
Applications
| Mobile Phone Baseband Power | Digital Camera Sensor Bias |
|---|---|
Use Scenario: Powers baseband processor core or memory interface in GSM/3G smartphones with tight battery voltage margins. IC Role / Device Role / Timing Role: Primary 2.8 V LDO delivering clean, regulated supply with fast load transient response to handle burst-mode processing. Use Value: 200 mV dropout extends usable battery range by >15 minutes per charge cycle compared to higher-dropout alternatives. | Use Scenario: Supplies image sensor analog front-end requiring stable low-noise voltage in compact digital still/video cameras. IC Role / Device Role / Timing Role: Low-noise, precision voltage source for CCD/CMOS sensor bias rails where ripple induces fixed-pattern noise. Use Value: 160 µV RMS noise and ±0.75% tolerance minimize sensor dark current variation and pixel non-uniformity. |
| PDA Application Processor Core | MP3 Player Audio DAC Supply |
Use Scenario: Provides core voltage to ARM-based application processors in legacy PDAs with limited PCB real estate. IC Role / Device Role / Timing Role: Compact, high-accuracy LDO enabling reliable operation across battery discharge profile (4.2 V → 3.0 V). Use Value: SOT-23-5 footprint and 600 µA quiescent current support thin form factor and multi-day standby battery life. | Use Scenario: Powers stereo audio DAC in portable MP3 players where supply noise directly impacts THD+N performance. IC Role / Device Role / Timing Role: Low-noise, well-regulated 2.8 V rail isolating DAC from noisy system power domains. Use Value: 63 dB ripple rejection attenuates switching noise from main DC/DC converter, improving audio SNR by ≥3 dB. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP2981-28DBVRE4 | Standard grade (±1.25% output tolerance), otherwise identical pinout, package, and electrical specs. | Lower accuracy acceptable in non-critical digital I/O or LED bias applications. | Select when cost sensitivity outweighs need for tight output regulation. |
| MCP1700T-2802E/MB | 300 mA rated, 6 µA quiescent current, no shutdown pin; SOT-23-3 package (3-pin, no ON/OFF or NC). | Lacks enable control and uses smaller footprint but requires external enable circuitry for shutdown functionality. | Choose for higher current or ultra-low IQ needs where shutdown is managed externally. |
Compared with LP2981-28DBVRE4 and MCP1700T-2802E/MB, the LP2981A-28DBVRE4 uniquely balances A-grade precision, integrated shutdown, and proven stability in space-constrained portable systems - making it optimal for battery-powered applications demanding both accuracy and low standby power.
Availability
LP2981A-28DBVRE4 is available at Aetrix Electronics and suitable for mobile phones, digital cameras, and PDAs requiring stable component supply with guaranteed long-term sourcing and consistent parametric performance.
Supply support for LP2981A-28DBVRE4 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 and broad distribution through authorized channels.
The LP2981A-28DBVRE4 belongs to TI's ultra-low dropout LDO family designed specifically for portable electronics - emphasizing minimal dropout, low quiescent current, and small-footprint packaging for battery-operated devices.
FAQ
What is the maximum input voltage rating for the LP2981A-28DBVRE4?
The LP2981A-28DBVRE4 has an absolute maximum input voltage of 16 V. Operation above this level risks permanent damage. The recommended operating range is 2.2 V to 16 V, with 2.2 V being the minimum required to properly bias the internal control circuitry for stable 2.8 V regulation.
Does the LP2981A-28DBVRE4 require an external capacitor on the ON/OFF pin?
No, the LP2981A-28DBVRE4 does not require an external capacitor on the ON/OFF pin. However, the ON/OFF input must be actively terminated: connect to VIN if shutdown is unused, or drive with a logic signal meeting voltage thresholds (≤0.15 V for OFF, ≥1.6 V for ON) and slew rate ≥40 mV/µs to avoid malfunction.
Can ceramic capacitors be used for the output of the LP2981A-28DBVRE4?
Ceramic capacitors alone are not recommended for the LP2981A-28DBVRE4 output due to their very low ESR, which can cause instability. If used, a 1 Ω resistor must be placed in series with the ceramic capacitor to meet the required ESR range. Solid tantalum capacitors are preferred for optimal stability.
What is the purpose of Pin 4 (NC) on the LP2981A-28DBVRE4?
Pin 4 on the LP2981A-28DBVRE4 is designated NC (No Connect) and is internally unconnected. It must be left open and unconnected to any trace, plane, or component - soldering or routing to this pin may result in unpredictable device behavior or failure.
How does reverse input-output voltage affect the LP2981A-28DBVRE4?
The LP2981A-28DBVRE4 contains an inherent parasitic diode between VIN and VOUT. If VOUT exceeds VIN by ~0.7 V, this diode forward-biases and may trigger latch-up. To prevent damage, an external Schottky diode (anode to VOUT, cathode to VIN) is required in applications where reverse voltage is possible.
LP2981A-28DBVRE4 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-28DBVRE4 FAQ
1.How can I place an order for LP2981A-28DBVRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2981A-28DBVRE4 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-28DBVRE4 reliable?
The price and inventory of LP2981A-28DBVRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP2981A-28DBVRE4 is usually 5 days.
3.What payment methods are accepted for LP2981A-28DBVRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2981A-28DBVRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2981A-28DBVRE4?
LP2981A-28DBVRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2981A-28DBVRE4 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-28DBVRE4?
For technical support, including LP2981A-28DBVRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2981A-28DBVRE4 requirements.
6.How does Aetrix verify that LP2981A-28DBVRE4 is sourced from the original manufacturer or authorized distributors?
All LP2981A-28DBVRE4 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-28DBVRE4 meets industry standards.
7.What is the process for return or replacement of LP2981A-28DBVRE4?
All LP2981A-28DBVRE4 units undergo pre-shipment inspection (PSI). If there is an issue with LP2981A-28DBVRE4, 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-28DBVRE4 part is unused and in its original packaging.
Return procedure for LP2981A-28DBVRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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