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Texas Instruments LP2981-30DBVRE4
- Part No.:
- LP2981-30DBVRE4
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LP2981-30DBVRE4.pdf
- Description:
- IC REG LINEAR 3V 100MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,119
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Product details
Overview
LP2981-30DBVRE4 from Texas Instruments is a 3.0 V fixed-output, ultra-low dropout linear regulator in SOT-23-5 package, delivering up to 100 mA with ±1.25% output tolerance (standard grade), 200 mV typical dropout at full load, and 0.01 µA shutdown current - designed for space-constrained portable power rails in mobile phones and PDAs.
For engineers reviewing the LP2981-30DBVRE4 datasheet, LP2981-30DBVRE4 pinout, LP2981-30DBVRE4 application, or LP2981-30DBVRE4 equivalent, key selection criteria include dropout voltage under 100 mA load, ON/OFF control interface compatibility, thermal performance in SOT-23, and minimum output capacitor ESR requirements for stability.
Technical Context
The LP2981-30DBVRE4 uses a PNP pass transistor architecture enabling ultra-low dropout operation - 7 mV at 1 mA and 200 mV at 100 mA - while maintaining stable regulation across –40°C to 125°C junction temperature. Its internal reference is trimmed to 1.23 V, feeding a precision error amplifier that controls output via external resistor divider (not required for fixed-output variants).
It integrates overcurrent and thermal shutdown protection, fast transient response to load steps, and a dedicated ON/OFF pin requiring ≥1.6 V to enable and ≤0.3 V to disable - with 0.01 µA typical shutdown current. Pin 4 is NC (no connect) and must remain unconnected per TI specification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.0 V nominal, ±1.25% tolerance over –40°C to 125°C - ensures stable core logic supply for 3.3 V–tolerant microcontrollers and sensors. |
| Max Output Current | 100 mA continuous - sufficient for low-power MCU cores, RF front-ends, or sensor signal chains without external boost. |
| Dropout Voltage | 200 mV typical at 100 mA - enables regulation from 3.2 V input (e.g., single Li-ion cell post-LDO) while maintaining 3.0 V output. |
| Quiescent Current | 600 µA typical at full load - minimizes standby power loss in battery-operated systems with frequent sleep/wake cycles. |
| Shutdown Current | 0.01 µA typical - reduces system-level leakage to sub-nA levels when powered down, critical for multi-year battery life. |
| Input Voltage Range | 2.2 V to 16 V - supports wide-input applications including USB-powered devices and industrial 12 V rails. |
| 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: 2.92 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 2.2–16 V; internal parasitic diode anode - requires external Schottky if VOUT may exceed VIN. |
| 2 (GND) | Ground reference | Analog ground return for regulator control circuitry; must be low-impedance and separated from digital GND where possible. |
| 3 (ON/OFF) | Enable/disable control input | Active-high: ≥1.6 V enables, ≤0.3 V disables; must be actively terminated (e.g., pulled to VIN if unused). |
| 4 (NC) | No-connect terminal | Internally unconnected; must be left floating - soldering or routing to any net violates TI specification. |
| 5 (VOUT) | Regulated output | 3.0 V fixed output; requires ≥3.3 µF output capacitor with specified ESR range for stability (e.g., solid tantalum). |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 200 mV at 100 mA load enables use with single-cell Li-ion (3.0–3.6 V) while sustaining full output voltage. |
| Shutdown control | 0.01 µA quiescent current in OFF state extends battery life in always-on IoT nodes and wearable sensors. |
| Integrated protection | Thermal foldback and current limiting prevent damage during short-circuit or high-temperature operation. |
| Stable with low-ESR caps | Validated for 3.3 µF minimum output capacitance with ESR matching load-current-dependent curves (e.g., 0.3 Ω @ 100 mA). |
| High PSRR | 63 dB ripple rejection at 1 kHz allows clean power delivery even when fed from noisy switchers or shared rails. |
Applications
| Mobile Phone Power Rail | Digital Camera Sensor Bias |
|---|---|
|
Use Scenario: Supplies 3.0 V to baseband processor I/O banks and RF transceiver analog sections in slim-profile smartphones. IC Role / Device Role / Timing Role: Low-noise, low-dropout voltage regulator providing stable bias independent of battery voltage decay. Use Value: Maintains 3.0 V ±1.25% across 3.2–4.2 V battery range and 1–100 mA dynamic load, preventing logic errors and RF desense. |
Use Scenario: Powers CMOS image sensor analog front-end and ADC reference in compact digital cameras. IC Role / Device Role / Timing Role: Fixed-output LDO delivering clean, ripple-free 3.0 V for precision analog signal conditioning. Use Value: 63 dB PSRR and 160 µV RMS noise ensure minimal quantization error and SNR degradation in 12-bit image capture. |
| PDA Core Logic Supply | MP3 Player Audio Codec Bias |
|
Use Scenario: Regulates 3.0 V for ARM9 application processor core and SRAM in handheld PDAs with extended battery runtime. IC Role / Device Role / Timing Role: High-efficiency linear regulator with shutdown mode enabling deep-sleep states. Use Value: 0.01 µA shutdown current and 600 µA active IQ reduce average system power by >40% during idle periods. |
Use Scenario: Provides low-noise 3.0 V bias to stereo audio DAC and headphone amplifier in portable MP3 players. IC Role / Device Role / Timing Role: Ultra-stable voltage source minimizing THD+N in audio signal path. Use Value: ±1.25% output tolerance and 200 mV dropout allow direct regulation from single Li-ion cell without efficiency penalty of buck conversion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-3002E/TT | 3.0 V, 250 mA, 1.6 µA IQ, no shutdown pin - uses different enable logic (active-low) and higher dropout (600 mV @ 250 mA). | Lacks ON/OFF pin; suited for always-on or microcontroller-gated enable schemes, not direct hardware shutdown control. | Select when higher output current is needed and shutdown functionality is implemented externally or not required. |
| NCP1117DT30RKG | 3.0 V, 1 A, 6 mA IQ, no shutdown, TO-252 package - significantly larger footprint and higher quiescent current. | Designed for high-current, non-portable applications; incompatible with space-constrained SOT-23 layouts. | Choose only for industrial designs needing >100 mA and accepting larger thermal mass and PCB area. |
Compared with MCP1700T-3002E/TT and NCP1117DT30RKG, the LP2981-30DBVRE4 uniquely balances ultra-low dropout (200 mV), hardware shutdown (0.01 µA off-state), and SOT-23-5 size - making it optimal for battery-powered portable systems where board space and standby power are critical.
Availability
LP2981-30DBVRE4 is available at Aetrix Electronics and suitable for mobile phone power management, digital camera sensor biasing, and PDA core logic supply requiring stable component supply with guaranteed long-term sourcing.
Supply support for LP2981-30DBVRE4 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 headquartered in Dallas, Texas, specializing in analog and embedded processing technologies with over 50 years of power management innovation.
The LP2981 family was developed specifically for ultra-low-power portable electronics, emphasizing minimal dropout, nanoscale shutdown current, and robust stability with small ceramic-tantalum hybrid capacitors.
FAQ
What is the output voltage tolerance of the LP2981-30DBVRE4 over temperature?
The LP2981-30DBVRE4 has a standard-grade output voltage tolerance of ±1.25% over the full operating junction temperature range of –40°C to 125°C. At 25°C, the tolerance is tighter at ±1.0%, and the device maintains this accuracy without external trimming components due to factory-trimmed internal reference and error amplifier.
Can the LP2981-30DBVRE4 be used with ceramic output capacitors?
The LP2981-30DBVRE4 is not stable with standard low-ESR ceramic capacitors alone. TI specifies a minimum ESR requirement (e.g., ~0.3 Ω at 100 mA), which typical ceramics fail to meet. To use ceramics, a 1 Ω series resistor must be added to raise effective ESR - or a solid tantalum capacitor meeting the ESR vs. load curve should be selected instead.
What is the maximum input voltage rating for the LP2981-30DBVRE4?
The absolute maximum input voltage for the LP2981-30DBVRE4 is 16 V, but 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 threshold may cause regulation failure or unpredictable shutdown behavior.
How does the ON/OFF pin function on the LP2981-30DBVRE4?
The ON/OFF pin on the LP2981-30DBVRE4 is an active-high enable input: ≥1.6 V turns the regulator ON, and ≤0.3 V places it in shutdown mode drawing only 0.01 µA. If unused, TI mandates connecting it directly to VIN - floating or weak pull-up risks erratic enable behavior due to noise susceptibility.
Is pin 4 (NC) on the LP2981-30DBVRE4 electrically connected internally?
No - pin 4 on the LP2981-30DBVRE4 is explicitly designated "NC" (no connect) in the TI datasheet and functional block diagram. It is not bonded internally and must remain unconnected on the PCB; routing, soldering, or grounding pin 4 violates TI's design specification and may compromise reliability or parametric performance.
LP2981-30DBVRE4 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):
- 3V
- 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
LP2981-30DBVRE4 FAQ
1.How can I place an order for LP2981-30DBVRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2981-30DBVRE4 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 LP2981-30DBVRE4 reliable?
The price and inventory of LP2981-30DBVRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP2981-30DBVRE4 is usually 5 days.
3.What payment methods are accepted for LP2981-30DBVRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2981-30DBVRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2981-30DBVRE4?
LP2981-30DBVRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2981-30DBVRE4 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 LP2981-30DBVRE4?
For technical support, including LP2981-30DBVRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2981-30DBVRE4 requirements.
6.How does Aetrix verify that LP2981-30DBVRE4 is sourced from the original manufacturer or authorized distributors?
All LP2981-30DBVRE4 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 LP2981-30DBVRE4 meets industry standards.
7.What is the process for return or replacement of LP2981-30DBVRE4?
All LP2981-30DBVRE4 units undergo pre-shipment inspection (PSI). If there is an issue with LP2981-30DBVRE4, 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 LP2981-30DBVRE4 part is unused and in its original packaging.
Return procedure for LP2981-30DBVRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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