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Texas Instruments LP3982ILDX-3.0/NOPB
- Part No.:
- LP3982ILDX-3.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LP3982ILDX-3.0/NOPB.pdf
- Description:
- IC REG LINEAR 3V 300MA 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:4,116
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Product details
Overview
LP3982ILDX-3.0/NOPB from Texas Instruments (formerly National Semiconductor) is a micropower, ultra low-dropout, low-noise 300mA CMOS linear regulator with fixed 3.0V output, 120mV typical dropout at full load, 90µA typical quiescent current, and 1nA shutdown current-designed for battery-powered wireless handsets and portable information appliances where energy efficiency and stable low-noise supply are critical.
For engineers reviewing the LP3982ILDX-3.0/NOPB datasheet, LP3982ILDX-3.0/NOPB pinout, LP3982ILDX-3.0/NOPB application, or LP3982ILDX-3.0/NOPB equivalent, key selection considerations include its 2.5V–6.0V input range, ±2% output voltage tolerance, 37µV RMS output noise (10Hz–100kHz), fault detection capability, and compatibility with 2.2µF ceramic output capacitors.
Technical Context
The LP3982ILDX-3.0/NOPB employs a PMOS pass transistor architecture enabling ultra-low dropout and near-zero drive current consumption-unlike PNP-based LDOs-while maintaining stability with small ceramic capacitors. Its internal bandgap reference, error amplifier, and fault-sensing circuitry support precise regulation and real-time monitoring of overcurrent, thermal overload, and input-to-output differential conditions.
It integrates a dedicated FAULT open-drain output that asserts low during dropout, current limit, or thermal shutdown, and features a SHDN pin with 0.4V logic-low threshold and 2V logic-high threshold-enabling seamless integration into battery-monitoring systems with micropower comparators like the LMC7215.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.0V ±2% - ensures stable core supply for DSPs and baseband ICs without external feedback components. |
| Max Output Current | 300mA - sufficient to power RF transceivers or microcontroller cores in handheld devices. |
| Dropout Voltage | 120mV typ @ 300mA - extends usable battery life by operating down to ~3.12V input when VOUT = 3.0V. |
| Quiescent Current | 90µA typ - minimizes standby drain in always-on subsystems such as RTC or memory keep-alive circuits. |
| Shutdown Current | 1nA typ - enables multi-week shelf life in shipped consumer electronics with deep sleep modes. |
| Output Noise | 37µV RMS (10Hz–100kHz) - meets stringent analog/RF supply requirements without additional filtering. |
| PSRR | 60dB typ - suppresses switching noise from adjacent DC/DC converters in mixed-power-supply designs. |
| Input Voltage Range | 2.5V to 6.0V - supports single-cell Li-ion (2.7–4.2V), dual-cell alkaline (2.4–3.2V), and regulated 5V rails. |
Pinout & Package
LP3982ILDX-3.0/NOPB is packaged in an 8-pin LLP (Leadless Leadframe Package), measuring 3.0mm × 3.0mm × 0.8mm, with wettable flank terminations for automated optical inspection (AOI) and enhanced solder joint reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input Power Supply | Accepts 2.5V–6.0V input; requires ≥1µF ceramic decoupling close to pin for stability. |
| 2 (GND) | Ground Reference | Primary ground return for regulator core, FAULT, and SHDN; must connect to low-impedance PCB plane. |
| 3 (OUT) | Regulated Output | Delivers 3.0V ±2% at up to 300mA; stable with ≥2.2µF X5R/X7R ceramic capacitor. |
| 4 (FAULT) | Fault Indicator Output | Open-drain output pulled low during dropout, overcurrent, or thermal shutdown; requires external 100kΩ pull-up. |
| 5 (SHDN) | Shutdown Control | Logic input: <0.4V disables regulator (1nA IQ); >2V enables operation; tolerant up to 6.5V. |
| 6 (CC) | Noise Bypass Terminal | Connects to 33nF NPO/COG capacitor to reduce output noise; directly ties to internal bandgap node. |
| 7 (OUT) | Secondary Output Connection | Dual-output-pad design lowers impedance and improves thermal dissipation under high-current loads. |
| 8 (GND) | Secondary Ground Terminal | Second ground path reduces ground bounce and improves PSRR performance at high frequencies. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-Low Dropout | 120mV typical at 300mA enables operation with minimal headroom-critical for single-cell Li-ion systems nearing end-of-discharge. |
| Low-Noise Regulation | 37µV RMS output noise (10Hz–100kHz) eliminates need for post-regulator LC filters in sensitive RF/analog signal chains. |
| PMOS Pass Transistor | Eliminates base-drive current loss, achieving 90µA quiescent current-~3× lower than comparable PNP LDOs. |
| Fault Detection Logic | Integrated FAULT pin monitors input-output differential, current limit, and thermal events-enables system-level health reporting without external sensors. |
| Ceramic Capacitor Stability | Stable with 2.2µF ceramic output caps (X5R/X7R); avoids cost, size, and reliability drawbacks of tantalum alternatives. |
| Fast Startup Time | 120µs typical turn-on time with 10µF output cap-supports rapid wake-from-sleep sequences in portable devices. |
Applications
| Wireless Handset Power | DSP Core Supply |
|---|---|
Use Scenario: Powers RF transceiver and baseband processor in GSM/UMTS smartphones during active call mode with dynamic load current from 10mA to 300mA. IC Role / Device Role / Timing Role: Primary 3.0V LDO delivering clean, low-noise bias to analog front-end and digital core blocks. Use Value: 60dB PSRR rejects noise from switching PMIC stages; 120mV dropout preserves battery runtime beyond 3.2V cutoff. | Use Scenario: Supplies 3.0V to low-power DSP cores (e.g., TI C55x, ADI SHARC) in portable audio recorders and voice assistants. IC Role / Device Role / Timing Role: Precision voltage source with tight ±2% tolerance and fast transient response for deterministic instruction execution. Use Value: 37µV RMS noise prevents audible artifacts in ADC/DAC signal paths; 120µs startup aligns with DSP boot timing budgets. |
| Battery-Powered Instrumentation | Portable Information Appliance |
Use Scenario: Powers sensor interface ASICs and microcontrollers in handheld multimeters and gas detectors operating from two AA cells. IC Role / Device Role / Timing Role: Micropower LDO maintaining regulation during intermittent 100ms measurement bursts and extended 24-hour standby. Use Value: 1nA shutdown current enables >5-year shelf life; 90µA quiescent current supports >1-year operational life on primary batteries. | Use Scenario: Supplies 3.0V to display driver, touch controller, and flash memory in e-readers and portable medical data loggers. IC Role / Device Role / Timing Role: Low-noise, high-PSRR regulator isolating sensitive display and memory interfaces from noisy system power domains. Use Value: Dual GND/OUT pins reduce impedance-induced voltage droop during LCD backlight switching transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS73030DBVR | 300mA, 3.0V fixed, 160mV dropout @ 300mA, 170µA IQ, no FAULT pin, SOT-23-5 package | Lacks fault reporting and dual-output pads; higher dropout reduces usable battery range | Choose if board space is constrained and fault monitoring is handled externally. |
| MCP1700T-3002E/MB | 250mA, 3.0V fixed, 175mV dropout @ 250mA, 1.6µA IQ, no FAULT, SOT-23-3 package | Lower current rating and no fault output; optimized for ultra-low-IQ rather than noise/PSRR performance | Choose only for sub-200mA applications where nanowatt shutdown dominates all other criteria. |
Compared with TPS73030DBVR and MCP1700T-3002E/MB, LP3982ILDX-3.0/NOPB delivers superior noise performance (37µV vs. ≥65µV), integrated fault signaling, and lower dropout-making it the preferred choice for battery-critical, noise-sensitive portable systems requiring diagnostic visibility and maximum energy extraction.
Availability
LP3982ILDX-3.0/NOPB is available at Aetrix Electronics and suitable for wireless handsets, DSP core power, and portable information appliances requiring stable component supply across long production lifecycles and varying demand volumes.
Supply support for LP3982ILDX-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 acquired National Semiconductor in 2011 and maintains its precision analog and power management product lines with full datasheet, simulation model, and application support.
The LP3982ILDX-3.0/NOPB belongs to TI's legacy micropower LDO family, engineered specifically for battery-operated portable electronics demanding ultra-low quiescent current, low-noise output, and robust fault diagnostics in compact surface-mount packages.
FAQ
What is the minimum input voltage required for LP3982ILDX-3.0/NOPB to maintain regulation?
The LP3982ILDX-3.0/NOPB requires a minimum input voltage of 2.5V per its absolute ratings and operating specifications. However, to sustain 3.0V output at 300mA load, VIN must exceed VOUT by at least the dropout voltage-120mV typical-so practical minimum is ~3.12V. Below 2.5V, the device ceases regulation and enters undervoltage lockout.
Does LP3982ILDX-3.0/NOPB require an external noise bypass capacitor, and what value is recommended?
Yes, LP3982ILDX-3.0/NOPB includes a dedicated CC pin (Pin 6) for a noise bypass capacitor. The recommended value is 33nF using NPO or COG ceramic dielectrics to minimize leakage and maximize noise reduction. This capacitor connects directly to the internal bandgap reference and reduces output voltage noise from 37µV RMS to lower levels without affecting transient response.
How does the FAULT pin on LP3982ILDX-3.0/NOPB behave during normal operation versus fault conditions?
During normal regulation, the FAULT pin remains high-impedance (open-drain) and requires an external pull-up resistor (typically 100kΩ). It pulls low only during confirmed fault events: thermal shutdown (>160°C junction), output current limiting (~330–770mA), or input-to-output differential falling below the tracked dropout threshold. It does not assert for brief line/load transients unless regulation is lost.
Can LP3982ILDX-3.0/NOPB operate stably with a 1µF ceramic input capacitor?
Yes, LP3982ILDX-3.0/NOPB specifies a minimum 1µF ceramic input capacitor for stability under normal PCB layouts. Larger values (e.g., 10µF tantalum) may be needed only in bench setups with long supply leads causing inductive coupling-but 1µF ceramic is fully sufficient and recommended for final production designs.
Is LP3982ILDX-3.0/NOPB pin-compatible with the MAX8860, and what limitations apply?
LP3982ILDX-3.0/NOPB is pin-, package-, and specification-compatible with Maxim's MAX8860 for fixed-output versions, including shared 8-pin MSOP/LLP footprints and identical pin functions. However, LP3982ILDX-3.0/NOPB lacks reverse-battery protection and Dual Mode™ functionality present in some MAX8860 variants-so direct substitution is valid only in forward-polarity, single-voltage applications.
LP3982ILDX-3.0/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.22V @ 200mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 270 µA
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Reverse Polarity
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-WSON (3x2.5)
LP3982ILDX-3.0/NOPB FAQ
1.How can I place an order for LP3982ILDX-3.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3982ILDX-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 LP3982ILDX-3.0/NOPB reliable?
The price and inventory of LP3982ILDX-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 LP3982ILDX-3.0/NOPB is usually 5 days.
3.What payment methods are accepted for LP3982ILDX-3.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3982ILDX-3.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3982ILDX-3.0/NOPB?
LP3982ILDX-3.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3982ILDX-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 LP3982ILDX-3.0/NOPB?
For technical support, including LP3982ILDX-3.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3982ILDX-3.0/NOPB requirements.
6.How does Aetrix verify that LP3982ILDX-3.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3982ILDX-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 LP3982ILDX-3.0/NOPB meets industry standards.
7.What is the process for return or replacement of LP3982ILDX-3.0/NOPB?
All LP3982ILDX-3.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3982ILDX-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 LP3982ILDX-3.0/NOPB part is unused and in its original packaging.
Return procedure for LP3982ILDX-3.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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