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Texas Instruments LP2981IM5X-3.6/NOPB
- Part No.:
- LP2981IM5X-3.6/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LP2981IM5X-3.6/NOPB.pdf
- Description:
- IC REG LINEAR 3.6V 100MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,671
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Product details
Overview
LP2981IM5X-3.6/NOPB from Texas Instruments is a fixed-output 3.6V, 100mA low-dropout (LDO) 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 capacitance. It serves as a precision post-regulator for microcontrollers and analog sensors in metering and industrial power rails.
For engineers reviewing the LP2981IM5X-3.6/NOPB datasheet, LP2981IM5X-3.6/NOPB pinout, LP2981IM5X-3.6/NOPB application, or LP2981IM5X-3.6/NOPB equivalent, key selection criteria include dropout voltage vs load/temperature, enable pin thresholds, ground current vs ILOAD, PSRR performance across 1kHz–1MHz, and compatibility with low-ESR ceramic capacitors without external compensation.
Technical Context
The LP2981IM5X-3.6/NOPB implements a CMOS pass transistor architecture with internal bandgap reference (1.2V), UVLO (2.2V rising, 1.9V falling), thermal shutdown (170°C), and overcurrent protection. Its soft-start mechanism limits inrush current during turn-on, reducing required input capacitance.
It integrates an active-high ON/OFF pin with 0.85V logic-high threshold and 0.15V logic-low threshold, plus internal output pulldown when disabled-enabling controlled discharge of downstream capacitance. The device operates across –40°C to +125°C junction temperature with no external components required for stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | Fixed 3.6V ±0.5% (A-grade) over line, load, and temperature - ensures stable MCU core supply under varying conditions. |
| Max output current | 100mA continuous - supports low-power microcontrollers, ADCs, and interface ICs without thermal derating at TJ ≤ 125°C. |
| Dropout voltage | 175mV at 100mA, 25°C - enables regulation from 3.775V input, critical for battery-backed or multi-rail systems. |
| PSRR | 75dB at 1kHz, 45dB at 1MHz - suppresses switching noise from upstream DC/DC converters, minimizing need for additional filtering. |
| Ground current | 620µA at 100mA load - enables high efficiency in always-on subsystems with tight quiescent current budgets. |
| Input voltage range | 2.5V to 16V - accommodates wide-input industrial supplies while maintaining regulation down to near-VOUT. |
| Capacitor support | Stable with ≥2.2µF ceramic COUT (ESR ≤ 1Ω) - eliminates need for tantalum or electrolytic capacitors, reducing BOM cost and footprint. |
Pinout & Package
LP2981IM5X-3.6/NOPB uses the DBV (SOT-23-5) package: 2.9mm × 2.8mm body, 0.95mm max height, gull-wing leads. Pin 4 is NC (no connect) and must remain floating per TI specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input supply | Accepts 2.5–16V input; requires ≥1µF ceramic capacitor to GND for stability and transient response. |
| 2 (GND) | Power ground | Common return path for input, output, and internal circuitry; must be low-impedance connection to PCB ground plane. |
| 3 (ON/OFF) | Enable control | Active-high logic input; >0.85V enables regulator, <0.15V disables it with internal output pulldown. |
| 4 (NC) | No connect | Reserved for factory calibration; must be left unconnected - no trace, no via, no test probe contact. |
| 5 (OUT) | Regulated output | Delivers 3.6V ±0.5%; requires ≥2.2µF ceramic capacitor to GND for guaranteed stability and PSRR performance. |
Key Features
| Feature | Design Value |
|---|---|
| ±0.5% output accuracy (A-grade) | Meets tight tolerance requirements for precision analog front-ends and 3.3V/3.6V MCU cores without external trimming. |
| 75dB PSRR @ 1kHz | Attenuates 1kHz ripple from AC/DC adapters or buck converter switching artifacts before reaching sensitive loads. |
| Internal soft-start | Reduces peak inrush current during power-up, lowering stress on input capacitors and upstream power stages. |
| Thermal shutdown & current limit | Protects against sustained overload or ambient overheating; auto-recovery after fault removal. |
| UVLO with 0.13V hysteresis | Prevents erratic startup/shutdown cycling during brown-out conditions by enforcing clean input voltage ramp. |
Applications
| Electricity Meters | Micro Inverters |
|---|---|
Use Scenario: Powering metrology ASICs, RTCs, and isolated communication interfaces in Class 0.2 smart meters. IC Role / Device Role / Timing Role: Primary 3.6V LDO for real-time clock and precision ADC bias rails. Use Value: ±0.5% accuracy ensures consistent energy measurement across temperature; 75dB PSRR prevents switching noise from DC/DC stage from corrupting ADC sampling. | Use Scenario: Supplying gate drivers and sensor signal conditioning circuits in residential solar micro-inverter control boards. IC Role / Device Role / Timing Role: Local 3.6V regulator for isolated gate driver bias and current-sense amplifier reference. Use Value: 175mV dropout allows operation from 3.775V input derived from auxiliary winding, enabling compact transformer design. |
| Server PSU Monitoring | Residential Breakers |
Use Scenario: Providing stable 3.6V supply to PMBus-compliant digital power controllers and temperature sensors in 12V server PSUs. IC Role / Device Role / Timing Role: Secondary LDO for digital controller VCC and EEPROM backup power. Use Value: 620µA ground current at full load minimizes standby power loss; –40°C to +125°C rating matches PSU thermal envelope. | Use Scenario: Powering arc-fault detection ICs and wireless BLE modules in smart residential circuit breakers. IC Role / Device Role / Timing Role: Always-on 3.6V regulator for low-power monitoring and RF subsystems. Use Value: Internal pulldown on disable ensures rapid discharge of BLE module capacitance during sleep mode transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TSS721AIPW | 3.3V fixed output, ±2% accuracy, 200mV dropout at 100mA, 65dB PSRR @ 1kHz | Lower accuracy and PSRR; suited for non-critical digital I/O rails only | Select only if 3.3V output and relaxed tolerance are acceptable; not suitable for precision analog or MCU core rails. |
| MCP1700T-3602E/TT | 3.6V fixed output, ±2% accuracy, 178mV dropout at 250mA, 60dB PSRR @ 1kHz, SOT-23-3 | Higher dropout at full load, no enable pin, lower PSRR, 3-pin package limits flexibility | Use where board space is constrained and enable functionality is unnecessary; verify thermal performance at 100mA in target layout. |
Compared with TSS721AIPW and MCP1700T-3602E/TT, LP2981IM5X-3.6/NOPB delivers tighter output accuracy (±0.5% vs ±2%), higher PSRR (75dB vs ≤65dB), and integrated enable with pulldown-making it superior for precision, noise-sensitive, and power-managed applications.
Availability
LP2981IM5X-3.6/NOPB is available at Aetrix Electronics and suitable for electricity metering, micro-inverter control, server PSU monitoring, and residential breaker intelligence requiring stable component supply, long-term lifecycle support, and automotive-grade reliability.
Supply support for LP2981IM5X-3.6/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, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.
The LP2981-N product line targets cost-sensitive, high-reliability industrial power management applications-specifically designed to replace legacy LDOs with improved accuracy, PSRR, and thermal robustness in metering, grid infrastructure, and distributed energy systems.
FAQ
What is the maximum input voltage rating for LP2981IM5X-3.6/NOPB?
The absolute maximum continuous input voltage for LP2981IM5X-3.6/NOPB is 18V. However, the recommended operating range is 2.5V to 16V. Exceeding 16V may trigger internal UVLO or reduce long-term reliability; operation above 18V risks permanent damage per TI's Absolute Maximum Ratings table.
Does LP2981IM5X-3.6/NOPB require an external capacitor on the ON/OFF pin?
No, LP2981IM5X-3.6/NOPB does not require an external capacitor on the ON/OFF pin. The enable function is internally buffered and rail-to-rail compatible. If unused, the ON/OFF pin must be tied directly to VIN-not through a resistor-to ensure reliable enablement and avoid floating node issues.
Can LP2981IM5X-3.6/NOPB operate with a 1µF output capacitor?
No-LP2981IM5X-3.6/NOPB requires a minimum of 2.2µF ceramic output capacitor for guaranteed stability and specified PSRR performance. While 1µF may appear functional in some lab conditions, TI's datasheet explicitly states 2.2µF as the minimum nominal value, derated to ≥1µF effective capacitance at operating bias and temperature.
What is the thermal shutdown behavior of LP2981IM5X-3.6/NOPB?
LP2981IM5X-3.6/NOPB activates thermal shutdown at 170°C junction temperature and resets at 150°C (20°C hysteresis). During shutdown, the output is disabled and internal pulldown engages. Recovery is automatic once junction temperature falls below 150°C, with no latch or external reset required.
Is pin 4 of LP2981IM5X-3.6/NOPB safe to connect to ground for ESD protection?
No-pin 4 of LP2981IM5X-3.6/NOPB is NC (no connect) and reserved for post-package calibration. TI explicitly prohibits connecting it to ground, VIN, VOUT, or any potential. Doing so may activate internal trim circuitry, forcing VOUT out of tolerance or causing unpredictable behavior during testing or operation.
LP2981IM5X-3.6/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):
- 3.6V
- 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-3.6/NOPB FAQ
1.How can I place an order for LP2981IM5X-3.6/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2981IM5X-3.6/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-3.6/NOPB reliable?
The price and inventory of LP2981IM5X-3.6/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-3.6/NOPB is usually 5 days.
3.What payment methods are accepted for LP2981IM5X-3.6/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2981IM5X-3.6/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2981IM5X-3.6/NOPB?
LP2981IM5X-3.6/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2981IM5X-3.6/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-3.6/NOPB?
For technical support, including LP2981IM5X-3.6/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2981IM5X-3.6/NOPB requirements.
6.How does Aetrix verify that LP2981IM5X-3.6/NOPB is sourced from the original manufacturer or authorized distributors?
All LP2981IM5X-3.6/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-3.6/NOPB meets industry standards.
7.What is the process for return or replacement of LP2981IM5X-3.6/NOPB?
All LP2981IM5X-3.6/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP2981IM5X-3.6/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-3.6/NOPB part is unused and in its original packaging.
Return procedure for LP2981IM5X-3.6/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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