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Texas Instruments LP2981AIM5X-3.6/NOPB
- Part No.:
- LP2981AIM5X-3.6/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LP2981AIM5X-3.6/NOPB.pdf
- Description:
- IC REG LINEAR 3.6V 100MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,468
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Product details
Overview
LP2981AIM5X-3.6/NOPB from Texas Instruments is a fixed 3.6V, 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 capacitance. It serves as a precision post-regulator for low-voltage microcontrollers in electricity meters and micro-inverters.
For engineers reviewing the LP2981AIM5X-3.6/NOPB datasheet, LP2981AIM5X-3.6/NOPB pinout, LP2981AIM5X-3.6/NOPB application, or LP2981AIM5X-3.6/NOPB equivalent, key selection criteria include dropout voltage across temperature, enable threshold stability, PSRR performance at switching frequencies up to 1MHz, and compatibility with 2.2µF MLCC output capacitors without external compensation.
Technical Context
The LP2981AIM5X-3.6/NOPB implements a CMOS pass transistor architecture with internal bandgap reference and soft-start circuitry, enabling controlled inrush current during power-up. Its UVLO threshold is 2.2V (rising) with 130mV hysteresis, ensuring reliable startup under brownout conditions.
This device integrates overcurrent limiting (150mA steady-state), thermal shutdown (170°C trip), and active output pulldown during disable. The ON/OFF pin supports active-high enable with 0.85V minimum high-level threshold and 0.15V maximum low-level threshold across –40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.6V ±0.5% (A-grade) over load and temperature - ensures stable MCU core supply within tight tolerance bands. |
| Max Output Current | 100mA continuous - sufficient for low-power microcontrollers and sensor interfaces without thermal derating in standard PCB layouts. |
| Dropout Voltage | 175mV at 100mA, –40°C to +125°C - enables regulation from 3.775V input, critical for battery-backed or wide-input industrial rails. |
| PSRR | 75dB at 1kHz, 45dB at 1MHz - suppresses ripple from upstream DC/DC converters, reducing need for additional filtering stages. |
| Quiescent Current | 69μA at zero load, 620μA at 100mA - minimizes standby power in always-on metering applications. |
| Input Voltage Range | 2.5V to 16V - supports direct connection to 3.3V, 5V, 12V system rails and accommodates transient overvoltage conditions. |
| Operating Temperature | –40°C to +125°C junction - qualified for industrial and outdoor energy infrastructure environments. |
Pinout & Package
LP2981AIM5X-3.6/NOPB uses the DBV (SOT-23-5) package: 2.9mm × 2.8mm footprint with gull-wing leads. Pin 4 is NC (no connect) and must remain floating per TI specification to preserve output accuracy calibration.
| 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) | Ground reference | Common substrate return path for regulator control circuitry and output stage; connects to PCB ground plane. |
| 3 (ON/OFF) | Enable control | Active-high logic input; drives high (>0.85V) to enable output, low (<0.15V) to disable with active pulldown. |
| 4 (NC) | No connect | Factory-calibration test pad; must remain unconnected - any continuity test or soldering risks VOUT accuracy shift. |
| 5 (OUT) | Regulated output | Delivers 3.6V ±0.5%; requires ≥2.2µF ceramic capacitor to GND for stability and PSRR optimization. |
Key Features
| Feature | Design Value |
|---|---|
| Stable with 2.2µF ceramic output cap | Eliminates need for tantalum or electrolytic capacitors, reducing board area, cost, and failure risk in long-life deployments. |
| Internal soft-start | Controls inrush current during power-up, minimizing stress on input capacitors and upstream power sources. |
| Active output pulldown on disable | Forces VOUT to GND when disabled, preventing floating outputs that could cause downstream logic glitches. |
| High PSRR at 1MHz | 45dB attenuation of 1MHz switching noise enables clean 3.6V rail even when fed from noisy buck converters. |
| UVLO with hysteresis | 2.2V rising / 1.9V falling thresholds prevent oscillation during marginal input conditions in utility meter applications. |
Applications
| Electricity Meters | Micro Inverters |
|---|---|
Use Scenario: Powering metrology ICs and real-time clocks in Class 0.5 smart meters operating continuously from AC-derived 3.3V/5V rails. IC Role / Device Role / Timing Role: Primary 3.6V LDO supplying analog front-end and isolation interface circuits requiring ultra-low noise and ±0.5% regulation. Use Value: Maintains ADC reference stability and RTC accuracy over full temperature range without external trimming or calibration. | Use Scenario: Providing isolated auxiliary power for gate drivers and communication ICs in residential solar micro-inverter control boards. IC Role / Device Role / Timing Role: Post-regulator after flyback converter, delivering clean 3.6V to isolated SPI isolators and PWM controllers. Use Value: 75dB PSRR at 1kHz attenuates flyback switching ripple, eliminating need for ferrite beads or LC filters in space-constrained designs. |
| Server PSU Monitoring | Residential Breakers |
Use Scenario: Supplying 3.6V to PMBus monitoring ICs and temperature sensors on 12V server PSU daughterboards. IC Role / Device Role / Timing Role: Low-quiescent LDO supporting always-on telemetry functions with <100μA standby current. Use Value: 69μA IQ at zero load extends runtime of backup supercapacitors during AC loss events. | Use Scenario: Powering arc-fault detection ASICs and BLE radios in UL 4750-compliant residential circuit breakers. IC Role / Device Role / Timing Role: Precision 3.6V source for analog comparators and RF transceivers operating across –40°C to +85°C ambient. Use Value: ±0.5% output accuracy ensures consistent trip thresholds and RF transmit power levels despite input voltage sag. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP2981AIM5-3.6/NOPB | Tape-and-reel vs cut-tape packaging; identical electrical specs and pinout. | No functional difference; suitable for same PCB layout and thermal design. | Select for automated SMT placement where reel packaging is required. |
| MCP1700T-3602E/TT | Lower IQ (1.6μA), lower max current (250mA), but only 65dB PSRR at 1kHz and no active pulldown. | Better for ultra-low-power battery systems; less suitable for noisy switcher-fed applications requiring >70dB PSRR. | Choose when standby current dominates design priority and PSRR >70dB is not required. |
Compared with LP2981AIM5X-3.6/NOPB, the LP2981AIM5-3.6/NOPB offers identical performance in reel format, while the MCP1700T-3602E/TT trades PSRR and active discharge for ultra-low quiescent current - making it viable only where noise immunity is secondary to energy harvesting or battery life.
Availability
LP2981AIM5X-3.6/NOPB is available at Aetrix Electronics and suitable for electricity meters, micro inverters, and residential breakers requiring stable component supply with guaranteed long-term manufacturability and traceable sourcing.
Supply support for LP2981AIM5X-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 specializing in analog and embedded processing technologies, with decades of expertise in power management ICs for industrial and energy infrastructure.
The LP2981-N product line delivers high-accuracy, low-noise LDOs optimized for precision metrology, renewable energy controls, and safety-critical power sequencing in harsh-temperature environments.
FAQ
What is the dropout voltage of LP2981AIM5X-3.6/NOPB at 100mA and 125°C?
The dropout voltage of LP2981AIM5X-3.6/NOPB is 218mV at 100mA load and –40°C to +125°C junction temperature, as specified in the Electrical Characteristics table under "VIN – VOUT" test condition IOUT = 100 mA, –40°C ≤ TJ ≤ 125°C. This value reflects worst-case regulation margin for thermal design validation in LP2981AIM5X-3.6/NOPB applications.
Does LP2981AIM5X-3.6/NOPB require an external capacitor on the ON/OFF pin?
No, LP2981AIM5X-3.6/NOPB does not require an external capacitor on the ON/OFF pin. The device features internal hysteresis and noise immunity; TI specifies direct connection to VIN (for always-on operation) or a clean logic signal. Adding capacitance may slow enable/disable timing and is not recommended unless validated per LP2981AIM5X-3.6/NOPB application notes.
Can LP2981AIM5X-3.6/NOPB be used with a 1µF output capacitor?
No - LP2981AIM5X-3.6/NOPB requires a minimum 2.2µF ceramic output capacitor for guaranteed stability and PSRR performance, as confirmed in Section 5.3 Recommended Operating Conditions and Figure 5-43. Using 1µF violates the 50% derating rule and risks oscillation or degraded transient response in LP2981AIM5X-3.6/NOPB implementations.
What is the maximum input voltage rating for LP2981AIM5X-3.6/NOPB?
The absolute maximum continuous input voltage for LP2981AIM5X-3.6/NOPB is 18V, per Section 5.1 Absolute Maximum Ratings. However, the recommended operating range is 2.5V to 16V. Operation above 16V is outside recommended conditions and may impact long-term reliability or parametric guarantees for LP2981AIM5X-3.6/NOPB.
Is pin 4 of LP2981AIM5X-3.6/NOPB connected internally?
No - pin 4 of LP2981AIM5X-3.6/NOPB is NC (no connect) and reserved exclusively for post-packaging factory calibration. TI explicitly prohibits connecting it to any potential, including GND. Doing so invalidates output accuracy and may permanently shift LP2981AIM5X-3.6/NOPB VOUT beyond ±0.5% spec.
LP2981AIM5X-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
LP2981AIM5X-3.6/NOPB FAQ
1.How can I place an order for LP2981AIM5X-3.6/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2981AIM5X-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 LP2981AIM5X-3.6/NOPB reliable?
The price and inventory of LP2981AIM5X-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 LP2981AIM5X-3.6/NOPB is usually 5 days.
3.What payment methods are accepted for LP2981AIM5X-3.6/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2981AIM5X-3.6/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2981AIM5X-3.6/NOPB?
LP2981AIM5X-3.6/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2981AIM5X-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 LP2981AIM5X-3.6/NOPB?
For technical support, including LP2981AIM5X-3.6/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2981AIM5X-3.6/NOPB requirements.
6.How does Aetrix verify that LP2981AIM5X-3.6/NOPB is sourced from the original manufacturer or authorized distributors?
All LP2981AIM5X-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 LP2981AIM5X-3.6/NOPB meets industry standards.
7.What is the process for return or replacement of LP2981AIM5X-3.6/NOPB?
All LP2981AIM5X-3.6/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP2981AIM5X-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 LP2981AIM5X-3.6/NOPB part is unused and in its original packaging.
Return procedure for LP2981AIM5X-3.6/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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