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Texas Instruments LP2981IM5X-3.0/NOPB
- Part No.:
- LP2981IM5X-3.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LP2981IM5X-3.0/NOPB.pdf
- Description:
- IC REG LINEAR 3V 100MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:5,798
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Product details
Overview
LP2981IM5X-3.0/NOPB from Texas Instruments is a fixed 3.0V, 100mA low-dropout (LDO) voltage regulator in SOT-23-5 package, featuring ±0.5% output accuracy (A-grade), 175mV dropout at 100mA, 75dB PSRR at 1kHz, and stable operation with 2.2µF ceramic output capacitors. It serves as a precision post-regulator for low-voltage microcontrollers in electricity meters and micro-inverters.
For engineers reviewing the LP2981IM5X-3.0/NOPB datasheet, LP2981IM5X-3.0/NOPB pinout, LP2981IM5X-3.0/NOPB application, or LP2981IM5X-3.0/NOPB equivalent, key selection criteria include dropout voltage vs load/temperature, enable threshold behavior, PSRR performance at switching frequencies up to 1MHz, and compatibility with low-ESR ceramic capacitors without external compensation.
Technical Context
The LP2981IM5X-3.0/NOPB implements a CMOS pass transistor architecture with internal bandgap reference (1.2V), UVLO (2.2–2.4V rising), thermal shutdown (170°C), and active-high ON/OFF control. Its soft-start mechanism limits inrush current during startup, reducing required input capacitance.
It delivers ±1% total output accuracy across –40°C to +125°C, 0.002%/V line regulation, and 0.5%/A load regulation - enabling direct powering of 3.0V MCUs without external trimming. The device supports input voltages from 2.5V to 16V and requires no external components beyond 1µF input and 2.2µF output ceramic capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.0V ±0.5% (A-grade); maintains regulation under 100mA load and full temperature range. |
| Dropout Voltage | 175mV at 100mA (25°C); enables operation with VIN as low as 3.175V while sustaining 3.0V output. |
| PSRR | 75dB at 1kHz, 45dB at 1MHz; suppresses ripple from upstream DC/DC converters without additional filtering. |
| Quiescent Current | 69μA at zero load; minimizes standby power in battery-backed or energy-harvesting systems. |
| Operating Temp | –40°C to +125°C junction; qualified for industrial and grid-edge applications including residential breakers. |
| Capacitor Support | Stable with ≥2.2µF ceramic COUT (ESR ≤1Ω); eliminates need for tantalum or electrolytic capacitors. |
| Enable Threshold | ON/OFF high threshold = 0.85V (min), low threshold = 0.15V (max); compatible with 1.8V/3.3V logic control signals. |
Pinout & Package
Package: DBV (SOT-23-5), 2.9mm × 2.8mm footprint with exposed pad not connected internally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input supply | Accepts 2.5V–16V; requires ≥1µF ceramic capacitor to GND for stability and transient response. |
| 2 (GND) | Ground reference | Common substrate return; connects to PCB ground plane for thermal and noise performance. |
| 3 (ON/OFF) | Enable control | Active-high logic input; drives high (>0.85V) to enable regulator, low (<0.15V) to disable with internal pulldown. |
| 4 (NC) | No-connect | Factory test/calibration pin; must remain floating - no connection to GND, VOUT, or any potential. |
| 5 (OUT) | Regulated output | Delivers 3.0V ±0.5%; requires ≥2.2µF ceramic capacitor to GND for loop stability and PSRR optimization. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 69μA at zero load enables >10-year battery life in metering applications with periodic wake-up. |
| High PSRR at switching frequencies | 45dB rejection at 1MHz allows clean 3.0V rail downstream of 1MHz buck converters without LC filters. |
| Internal soft-start | Controls inrush current during power-up, reducing peak input capacitance requirement by ~40%. |
| Thermal and overcurrent protection | Auto-recovery shutdown at 170°C and current limiting at 150mA prevent damage during fault conditions. |
| UVLO with hysteresis | 2.2V turn-on / 1.9V turn-off (0.13V hysteresis) prevents oscillation near minimum input voltage. |
Applications
| Electricity Meters | Micro Inverters |
|---|---|
Use Scenario: Powering metrology ASICs and real-time clocks in Class 0.2 smart meters operating continuously on AC-derived auxiliary supply. IC Role / Device Role / Timing Role: Primary 3.0V LDO supplying precision analog front-end and RTC; replaces discrete regulators requiring external resistors. Use Value: ±0.5% initial accuracy and ±1% over temperature ensure ADC reference stability without calibration drift. | Use Scenario: Providing isolated 3.0V bias for gate drivers and communication ICs in solar micro-inverter DC/AC stages. IC Role / Device Role / Timing Role: Post-regulator after wide-input DC/DC converter; supplies isolated MCU and RS-485 transceivers. Use Value: 75dB PSRR at 1kHz attenuates 20kHz–100kHz transformer-coupled ripple, eliminating secondary filtering. |
| Server PSU Monitoring | Residential Breakers |
Use Scenario: Generating 3.0V for PMBus/I²C monitoring ICs and fault-detection comparators in 12V server power supplies. IC Role / Device Role / Timing Role: Secondary LDO for digital supervision circuitry; operates from 12V intermediate bus with minimal heat dissipation. Use Value: 175mV dropout enables full 3.0V regulation even when 12V rail sags to 11.5V during transient load steps. | Use Scenario: Supplying 3.0V to arc-fault detection processors and wireless BLE modules in DIN-rail mounted circuit breakers. IC Role / Device Role / Timing Role: Always-on regulator for safety-critical monitoring functions; enabled via microcontroller GPIO. Use Value: 0.15V enable threshold ensures reliable disable during brown-out, preventing erratic MCU reset behavior. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV70730PDQNR | Lower IQ (25μA), lower max current (300mA), same SOT-23-5 package, but only ±2% accuracy over temp. | Better for ultra-low-power sensor nodes; less suitable for metrology-grade voltage references. | Select TLV70730PDQNR only if accuracy <±1% is not required and higher output current margin is needed. |
| MCP1700T-3002E/TT | Higher dropout (600mV @ 250mA), ±2% accuracy, no enable pin, SOT-23-3 package - incompatible pinout. | Suitable for cost-sensitive non-critical rails where enable control and tight accuracy are unnecessary. | MCP1700T-3002E/TT requires PCB redesign due to 3-pin vs 5-pin layout and lacks ON/OFF functionality. |
Compared with TLV70730PDQNR and MCP1700T-3002E/TT, LP2981IM5X-3.0/NOPB provides superior accuracy (±0.5% vs ±2%), lower dropout (175mV vs 600mV), and integrated enable control - making it optimal for precision industrial sensing and metering where regulation stability directly impacts measurement integrity.
Availability
LP2981IM5X-3.0/NOPB is available at Aetrix Electronics and suitable for electricity meters, micro inverters, and residential breakers requiring stable component supply with guaranteed long-term industrial availability.
Supply support for LP2981IM5X-3.0/NOPB 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 and embedded processing solutions, with over 50 years of power management innovation.
The LP2981-N product line targets industrial and energy infrastructure applications demanding high accuracy, wide temperature operation, and robust transient immunity - specifically designed for metering, grid-edge control, and distributed power systems.
FAQ
What is the maximum input voltage rating for LP2981IM5X-3.0/NOPB?
The LP2981IM5X-3.0/NOPB has an absolute maximum input voltage of 18V and a recommended operating range of 2.5V to 16V. Exceeding 16V during normal operation risks violating recommended conditions, though brief transients up to 18V are tolerated per absolute ratings. This 16V upper limit supports direct use after 12V intermediate bus stages in server PSUs and micro-inverters without pre-regulation.
Does LP2981IM5X-3.0/NOPB require an external pull-up resistor on the ON/OFF pin?
No, LP2981IM5X-3.0/NOPB does not require an external pull-up resistor on the ON/OFF pin. The device features an internal pulldown when disabled, and the ON/OFF pin is actively driven high by the host system. If unused, TI recommends tying the ON/OFF pin directly to VIN to ensure default-enable operation - no external components are needed for basic functionality.
Can LP2981IM5X-3.0/NOPB operate stably with a 1µF output capacitor?
No - LP2981IM5X-3.0/NOPB requires a minimum 2.2µF ceramic output capacitor for guaranteed stability across temperature and load. While the datasheet notes a nominal 1µF minimum effective capacitance (after 50% derating), TI specifies 2.2µF as the design value for all typical applications. Using only 1µF risks phase margin loss and potential oscillation, especially at high temperatures or light loads.
What is the thermal shutdown threshold of LP2981IM5X-3.0/NOPB?
The LP2981IM5X-3.0/NOPB activates thermal shutdown at a junction temperature of 170°C and resets when temperature falls to 150°C (20°C hysteresis). This threshold protects the device during sustained overload or poor PCB thermal design. With RθJA = 178.6°C/W in standard SOT-23-5 layout, continuous 100mA operation at 16V input can reach thermal limit without adequate copper pour - board-level thermal design is critical for full-load reliability.
Is LP2981IM5X-3.0/NOPB pin-compatible with earlier LP2981 variants?
Yes - LP2981IM5X-3.0/NOPB uses the identical DBV (SOT-23-5) package and pinout as legacy LP2981 devices, including pin 1 (IN), pin 2 (GND), pin 3 (ON/OFF), pin 4 (NC), and pin 5 (OUT). However, electrical differences exist: newer revision offers tighter accuracy (±0.5% vs ±0.75%), lower dropout, and improved PSRR. System-level validation is recommended before drop-in replacement in legacy designs.
LP2981IM5X-3.0/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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
LP2981IM5X-3.0/NOPB FAQ
1.How can I place an order for LP2981IM5X-3.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2981IM5X-3.0/NOPB 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 LP2981IM5X-3.0/NOPB reliable?
The price and inventory of LP2981IM5X-3.0/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP2981IM5X-3.0/NOPB is usually 5 days.
3.What payment methods are accepted for LP2981IM5X-3.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2981IM5X-3.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2981IM5X-3.0/NOPB?
LP2981IM5X-3.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2981IM5X-3.0/NOPB 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 LP2981IM5X-3.0/NOPB?
For technical support, including LP2981IM5X-3.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2981IM5X-3.0/NOPB requirements.
6.How does Aetrix verify that LP2981IM5X-3.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LP2981IM5X-3.0/NOPB 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 LP2981IM5X-3.0/NOPB meets industry standards.
7.What is the process for return or replacement of LP2981IM5X-3.0/NOPB?
All LP2981IM5X-3.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP2981IM5X-3.0/NOPB, 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 LP2981IM5X-3.0/NOPB part is unused and in its original packaging.
Return procedure for LP2981IM5X-3.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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