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Texas Instruments LP2981-28DBVRG4
- Part No.:
- LP2981-28DBVRG4
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LP2981-28DBVRG4.pdf
- Description:
- IC REG LINEAR 2.8V 100MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,467
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Product details
Overview
LP2981-28DBVRG4 from Texas Instruments is a 2.8 V fixed-output, 100-mA ultra-low dropout linear regulator in SOT-23-5 package, featuring 1.25% output tolerance (standard grade), 200 mV typical dropout at 100 mA, 600 µA typical ground current, and active shutdown with 0.01 µA standby current - deployed in mobile phones, digital cameras, and PDAs for stable low-noise power delivery.
For engineers reviewing the LP2981-28DBVRG4 datasheet, LP2981-28DBVRG4 pinout, LP2981-28DBVRG4 application, or LP2981-28DBVRG4 equivalent, key selection considerations include dropout voltage at light/heavy load, ON/OFF control interface compatibility, output capacitor ESR requirements, thermal derating in SOT-23, and reverse input-output protection necessity.
Technical Context
The LP2981-28DBVRG4 uses a PNP pass transistor architecture enabling ultra-low dropout (7 mV at 1 mA, 200 mV at 100 mA) and low quiescent current (600 µA typ at full load). Its internal reference is 1.23 V, with feedback resistors R1/R2 set for 2.8 V output.
It integrates overcurrent and thermal shutdown protection, supports fast transient response, and requires an external ON/OFF pull-up to VIN if shutdown is unused. Pin 4 (NC) must remain unconnected per TI specification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.8 V nominal, ±1.25% tolerance over –40°C to 125°C - ensures stable rail for 2.8 V logic or analog circuitry without external trimming. |
| Max Input Voltage | 16 V - supports wide-input applications including battery-powered systems with varying charge states or unregulated supplies. |
| Dropout Voltage | 200 mV at 100 mA load - enables regulation from 3.0 V input down to 2.8 V output, critical for single-cell Li-ion or Li-poly operation. |
| Ground Current | 600 µA typical at 100 mA load - minimizes wasted current in portable devices, extending battery life versus higher-IQ regulators. |
| Shutdown Current | 0.01 µA typical - allows near-zero power consumption during system sleep, essential for always-on sensor nodes or standby modes. |
| Ripple Rejection | 63 dB at 1 kHz - suppresses switching noise from upstream DC/DC converters, preserving signal integrity in RF or audio subsystems. |
| Output Noise | 160 µV RMS (300 Hz–50 kHz) - low enough for noise-sensitive analog circuits like ADC references or RF bias rails. |
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 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Input supply connection | Accepts 2.2 V to 16 V; internal parasitic diode anode - requires Schottky clamp if VOUT may exceed VIN. |
| 2 - GND | Power ground reference | Low-impedance return path for load and quiescent current; must connect to clean analog ground plane. |
| 3 - ON/OFF | Enable/disable control input | Active-high: ≥1.6 V turns regulator on; ≤0.3 V shuts down output; must be actively terminated (e.g., pulled to VIN). |
| 4 - NC | No-connect terminal | Internally unconnected; must be left floating - soldering or routing to any net violates TI specification and risks malfunction. |
| 5 - VOUT | Regulated output | Delivers 2.8 V ±1.25% up to 100 mA; requires minimum 3.3 µF output capacitor with specified ESR for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 200 mV at 100 mA enables operation from marginal input sources (e.g., aging batteries or post-DC/DC ripple). |
| Shutdown mode | 0.01 µA IQ in OFF state supports multi-week battery shelf life in IoT endpoints and remote sensors. |
| Integrated protection | Thermal foldback and current limiting prevent damage during overload or ambient temperature excursions. |
| Stable with tantalum COUT | Validated for 3.3 µF solid tantalum capacitors - avoids ceramic instability issues while minimizing board area vs. aluminum electrolytics. |
| ESD robustness | 2000-V HBM / 200-V MM rating reduces susceptibility to handling damage in manufacturing and field service. |
Applications
| Mobile Phone Power Rail | Digital Camera Sensor Bias |
|---|---|
|
Use Scenario: Powers baseband processor I/O or camera module interface logic in space-constrained handset designs. IC Role / Device Role / Timing Role: Low-noise 2.8 V LDO supplying core logic voltage with fast load transient response to burst-mode data transfers. Use Value: 160 µV RMS noise and 63 dB ripple rejection preserve signal-to-noise ratio in high-resolution image capture paths. |
Use Scenario: Provides clean bias to CMOS image sensor analog front-end during exposure and readout cycles. IC Role / Device Role / Timing Role: Stable 2.8 V supply with <200 mV dropout ensures regulation even as Li-ion voltage drops below 3.2 V. Use Value: 200 mV dropout at 100 mA enables uninterrupted sensor operation across full battery discharge curve. |
| PDA Core Logic Supply | MP3 Player Audio DAC Reference |
|
Use Scenario: Delivers regulated 2.8 V to microcontroller peripherals and touch-screen controller in handheld PDAs. IC Role / Device Role / Timing Role: Shutdown-capable LDO synchronized with system sleep/wake signals to minimize idle power. Use Value: 0.01 µA shutdown current extends standby time beyond 30 days on a single AA cell pair. |
Use Scenario: Supplies precision reference voltage to stereo DAC in portable audio players requiring low THD+N. IC Role / Device Role / Timing Role: Low-noise, low-drift LDO replacing noisier switching supplies to reduce audible artifacts. Use Value: ±1.25% output tolerance and 160 µV RMS noise meet DAC reference accuracy and spectral purity specs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP2981A-28DBVR | A-grade version: ±0.75% output tolerance (vs. ±1.25% standard grade); otherwise identical electrical specs and pinout. | Required where tighter initial accuracy is needed for ADC reference or precision analog circuitry. | Select LP2981A-28DBVR when output voltage drift budget is <±1% over temperature and load. |
| MCP1700T-2802E/TT | 250 mA rated, 6 µA IQ, but 600 mV dropout at full load; SOT-23-3 (no ON/OFF pin); different ESR requirements. | Lacks shutdown control and has higher dropout - unsuitable for battery-critical or ultra-low-VIN use cases. | Choose MCP1700 only if higher output current is required and shutdown is unnecessary; verify layout compatibility. |
Compared with LP2981A-28DBVR, the LP2981-28DBVRG4 offers lower cost for standard-accuracy applications; versus MCP1700T-2802E/TT, it provides superior dropout performance and integrated enable control at the expense of 150 mA lower current rating.
Availability
LP2981-28DBVRG4 is available at Aetrix Electronics and suitable for mobile phones, digital cameras, and PDAs requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.
Supply support for LP2981-28DBVRG4 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 leader delivering analog, embedded processing, and connectivity solutions with broad industrial and automotive qualification.
The LP2981 family was designed specifically for portable electronics requiring ultra-low dropout, low quiescent current, and small-footprint packaging - targeting battery-powered devices where efficiency and board space are critical.
FAQ
What is the maximum input voltage rating for the LP2981-28DBVRG4?
The LP2981-28DBVRG4 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 regulation.
Does the LP2981-28DBVRG4 require an external capacitor on the ON/OFF pin?
No, the LP2981-28DBVRG4 does not require an external capacitor on the ON/OFF pin. However, TI specifies that the ON/OFF signal must have a slew rate ≥40 mV/µs; slow-rising edges may cause erratic shutdown behavior. A pull-up resistor to VIN is mandatory if shutdown is unused.
Can ceramic capacitors be used for the output of the LP2981-28DBVRG4?
Ceramic capacitors alone are not recommended for the LP2981-28DBVRG4 output due to their very low ESR, which can cause instability. If used, a 1 Ω series resistor must be added to raise effective ESR into the required range. Solid tantalum capacitors (≥3.3 µF) are the preferred solution.
What is the purpose of the NC pin (Pin 4) on the LP2981-28DBVRG4?
Pin 4 on the LP2981-28DBVRG4 is designated NC (No Connect) and is internally unconnected. TI explicitly requires it to be left open - connecting it to any net, including ground or VOUT, violates the device specification and may impair regulation or cause failure.
Is reverse input-output voltage protection required for the LP2981-28DBVRG4?
Yes - the LP2981-28DBVRG4 contains an inherent parasitic diode between VOUT and VIN. If VOUT exceeds VIN by ~0.7 V, this diode forward-biases and may trigger latch-up. TI mandates an external Schottky diode (anode to VOUT, cathode to VIN) to clamp reverse voltage to ~0.3 V and prevent damage.
LP2981-28DBVRG4 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
LP2981-28DBVRG4 FAQ
1.How can I place an order for LP2981-28DBVRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2981-28DBVRG4 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 LP2981-28DBVRG4 reliable?
The price and inventory of LP2981-28DBVRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP2981-28DBVRG4 is usually 5 days.
3.What payment methods are accepted for LP2981-28DBVRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2981-28DBVRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2981-28DBVRG4?
LP2981-28DBVRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2981-28DBVRG4 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 LP2981-28DBVRG4?
For technical support, including LP2981-28DBVRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2981-28DBVRG4 requirements.
6.How does Aetrix verify that LP2981-28DBVRG4 is sourced from the original manufacturer or authorized distributors?
All LP2981-28DBVRG4 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 LP2981-28DBVRG4 meets industry standards.
7.What is the process for return or replacement of LP2981-28DBVRG4?
All LP2981-28DBVRG4 units undergo pre-shipment inspection (PSI). If there is an issue with LP2981-28DBVRG4, 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 LP2981-28DBVRG4 part is unused and in its original packaging.
Return procedure for LP2981-28DBVRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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