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Texas Instruments LP2981-33DBVRE4
- Part No.:
- LP2981-33DBVRE4
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LP2981-33DBVRE4.pdf
- Description:
- IC REG LINEAR 3.3V 100MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,803
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Product details
Overview
LP2981-33DBVRE4 from Texas Instruments is a 3.3 V, 100-mA ultra-low dropout linear regulator in SOT-23-5 package with shutdown control, ±1.25% output tolerance (standard grade), 200 mV typical dropout at 100 mA, and 600 µA typical quiescent current - used for power management in mobile phones, PDAs, and digital cameras.
For engineers reviewing the LP2981-33DBVRE4 datasheet, LP2981-33DBVRE4 pinout, LP2981-33DBVRE4 application, or LP2981-33DBVRE4 equivalent, key selection criteria include dropout voltage at full load, shutdown current (<0.01 µA), input voltage range (2.2–16 V), thermal protection, and SOT-23-5 footprint compatibility with space-constrained portable designs.
Technical Context
The LP2981-33DBVRE4 employs a PNP pass transistor architecture enabling ultra-low dropout operation and stable regulation under varying load conditions. Its internal reference is trimmed to 1.23 V, and feedback is implemented via fixed resistor divider integrated into the die for 3.3 V output.
Shutdown is controlled by a dedicated ON/OFF pin requiring active termination - logic-high ≥1.6 V enables regulation, while ≤0.3 V disables output and reduces supply current to 0.01 µA. Pin 4 (NC) must remain unconnected per design specification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V nominal, ±1.25% tolerance over –40°C to 125°C - ensures stable core/sensor rail in consumer electronics. |
| Max Output Current | 100 mA continuous - sufficient for low-power microcontrollers, RF modules, and camera sensors. |
| Dropout Voltage | 200 mV typical at 100 mA load - enables regulation from 3.5 V input, extending battery life in single-cell Li-ion systems. |
| Quiescent Current | 600 µA typical at full load - minimizes no-load power loss in always-on subsystems. |
| Shutdown Current | 0.01 µA typical - critical for long-term standby in portable devices with battery backup. |
| Input Voltage Range | 2.2 V to 16 V - supports wide-input applications including automotive accessory rails and multi-cell battery packs. |
| Thermal Protection | Integrated overtemperature shutdown - prevents damage during sustained overload or poor PCB thermal design. |
Pinout & Package
SOT-23-5 (DBV) package: 2.92 mm × 1.6 mm × 1.3 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 external Schottky if VOUT may exceed VIN. |
| 2 (GND) | Ground reference | Analog ground return for regulator control circuitry and feedback network. |
| 3 (ON/OFF) | Enable/disable control | Pulled high ≥1.6 V to enable; ≤0.3 V to disable; must be actively terminated - floating state not allowed. |
| 4 (NC) | No-connect terminal | Internally unconnected - must be left open; soldering or routing to this pin invalidates operation. |
| 5 (VOUT) | Regulated output | 3.3 V source with fast transient response; requires ≥3.3 µF output capacitor with specified ESR for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 200 mV at 100 mA enables use with weak or depleting batteries without brownout. |
| Active shutdown | 0.01 µA off-state current extends shelf life and enables deep-sleep modes in IoT endpoints. |
| Fixed 3.3 V output | Eliminates external resistor network - reduces BOM count and layout area in compact designs. |
| Overcurrent & thermal protection | Self-limiting behavior prevents catastrophic failure during short-circuit or thermal overload events. |
| ESD robustness | 2000-V HBM rating allows safe handling in standard assembly environments without special precautions. |
Applications
| Mobile Phone Baseband | Digital Camera Sensor Rail |
|---|---|
Use Scenario: Powers baseband processor I/O and memory interface in GSM/UMTS handsets with tight space constraints. IC Role / Device Role / Timing Role: Primary 3.3 V LDO delivering clean, regulated voltage to digital logic blocks during burst transmission. Use Value: 200 mV dropout preserves operating margin as Li-ion battery discharges from 4.2 V to 3.4 V. | Use Scenario: Supplies image sensor and ISP core voltage in compact digital still/video cameras. IC Role / Device Role / Timing Role: Low-noise (160 µV RMS) 3.3 V source ensuring minimal analog signal corruption in pixel readout paths. Use Value: 63 dB ripple rejection suppresses switching noise from adjacent DC/DC converters. |
| PDA Application Processor | MP3 Player Audio Codec |
Use Scenario: Provides stable 3.3 V rail to ARM-based application processors in handheld PDAs. IC Role / Device Role / Timing Role: Main system regulator with fast transient response to handle CPU load spikes during UI rendering or data sync. Use Value: 7 mV dropout at 1 mA enables near-zero quiescent loss during idle states. | Use Scenario: Powers stereo audio codec and flash memory interface in portable MP3 players. IC Role / Device Role / Timing Role: Shutdown-controlled LDO activated only during playback to minimize battery drain. Use Value: 0.01 µA shutdown current enables >1-year shelf life with coin-cell backup. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP2981-33DBVR | Same electrical specs and pinout; differs only in reel packaging (3000 pcs vs. TBD quantity for E4 variant). | No functional difference - identical performance, thermal behavior, and PCB layout. | Select LP2981-33DBVR for standard large-volume tape-and-reel procurement. |
| MCP1700T-3302E/TT | 3.3 V, 250 mA, 1.6 µA IQ, no shutdown pin - higher current but lacks ON/OFF control. | Requires external enable circuitry for shutdown; unsuitable where ultra-low off-current is mandatory. | Choose MCP1700T-3302E/TT only if higher output current is needed and shutdown is managed externally. |
Compared with LP2981-33DBVR, the LP2981-33DBVRE4 offers identical regulation performance but targets specific distribution channels; versus MCP1700T-3302E/TT, it provides essential sub-µA shutdown capability at lower max current - critical for battery longevity in always-on portable systems.
Availability
LP2981-33DBVRE4 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 across production lots.
Supply support for LP2981-33DBVRE4 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 leadership in power management ICs.
The LP2981 family was designed specifically for ultra-low dropout, low-quiescent-current regulation in battery-powered portable electronics - emphasizing space efficiency, thermal resilience, and shutdown-enabled energy conservation.
FAQ
What is the output voltage tolerance of the LP2981-33DBVRE4?
The LP2981-33DBVRE4 has a standard-grade output voltage tolerance of ±1.25% over the full operating temperature range (–40°C to 125°C). This is confirmed in the Electrical Characteristics table of the TI SLVS521F datasheet, where ΔVOUT is specified as –1.25% to +1.25% at 25°C and –3.5% to +3.5% across –40°C to 125°C for the standard (non-A) grade. The LP2981-33DBVRE4 is explicitly listed in TI's ordering table as a standard-grade part.
Does the LP2981-33DBVRE4 require an external capacitor on the ON/OFF pin?
No, the LP2981-33DBVRE4 does not require an external capacitor on the ON/OFF pin. The datasheet specifies that the ON/OFF pin must be actively terminated - either pulled high to VIN (if shutdown is unused) or driven by a logic signal with ≥40 mV/µs slew rate. Adding capacitance would slow the edge rate and risk incorrect shutdown behavior, as noted in the "ON/OFF Operation" section of the TI SLVS521F datasheet.
Can the LP2981-33DBVRE4 be used with a ceramic output capacitor?
The LP2981-33DBVRE4 cannot be reliably stabilized with a standard ceramic output capacitor alone due to its very low ESR (<20 mΩ), which falls below the minimum required for loop stability. As stated in the "Capacitor Characteristics" section of the TI SLVS521F datasheet, a 1-Ω series resistor must be added to raise the effective ESR if ceramic capacitors are used - otherwise, oscillation or poor transient response may occur.
What is the maximum allowable input voltage for the LP2981-33DBVRE4?
The absolute maximum continuous input voltage for the LP2981-33DBVRE4 is 16 V, as specified in the Absolute Maximum Ratings table of the TI SLVS521F datasheet. Operation above this voltage risks permanent device damage. The recommended operating range starts at 2.2 V (minimum required for control circuit biasing) and extends to 16 V, making it suitable for both single-cell Li-ion and industrial 12-V rail applications.
Is pin 4 (NC) on the LP2981-33DBVRE4 internally connected?
No, pin 4 on the LP2981-33DBVRE4 is explicitly designated as "NC - No connect" in the top-view package diagram and functional description of the TI SLVS521F datasheet. It is internally unconnected and must be left floating - any connection (to ground, supply, or signal) violates the device's operational specification and may impair regulation or cause malfunction.
LP2981-33DBVRE4 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):
- 3.3V
- 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
LP2981-33DBVRE4 FAQ
1.How can I place an order for LP2981-33DBVRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2981-33DBVRE4 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 LP2981-33DBVRE4 reliable?
The price and inventory of LP2981-33DBVRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP2981-33DBVRE4 is usually 5 days.
3.What payment methods are accepted for LP2981-33DBVRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2981-33DBVRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2981-33DBVRE4?
LP2981-33DBVRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2981-33DBVRE4 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 LP2981-33DBVRE4?
For technical support, including LP2981-33DBVRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2981-33DBVRE4 requirements.
6.How does Aetrix verify that LP2981-33DBVRE4 is sourced from the original manufacturer or authorized distributors?
All LP2981-33DBVRE4 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 LP2981-33DBVRE4 meets industry standards.
7.What is the process for return or replacement of LP2981-33DBVRE4?
All LP2981-33DBVRE4 units undergo pre-shipment inspection (PSI). If there is an issue with LP2981-33DBVRE4, 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 LP2981-33DBVRE4 part is unused and in its original packaging.
Return procedure for LP2981-33DBVRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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