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Texas Instruments LP3982ILDX-1.8
- Part No.:
- LP3982ILDX-1.8
- Manufacturer:
- Texas Instruments
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LP3982ILDX-1.8.pdf
- Description:
- IC REG LINEAR 1.8V 300MA 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,376
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Product details
Overview
LP3982ILDX-1.8 from Texas Instruments (formerly National Semiconductor) is a micropower, ultra low-dropout, low-noise CMOS linear regulator delivering 300mA output at fixed 1.8V with 120mV typical dropout at full load, 90µA typical quiescent current, and 37µVRMS output noise (10Hz–100kHz). It serves as core power for DSPs and battery-powered portable electronics where efficiency and noise sensitivity are critical.
For engineers reviewing the LP3982ILDX-1.8 datasheet, LP3982ILDX-1.8 pinout, LP3982ILDX-1.8 application, or LP3982ILDX-1.8 equivalent, key selection criteria include its 1nA shutdown current, ±2% output voltage tolerance, stability with 2.2µF ceramic output capacitors, and FAULT pin for regulation fault detection in space-constrained, low-power systems.
Technical Context
The LP3982ILDX-1.8 employs a PMOS pass transistor architecture enabling ultra-low dropout and near-zero drive current consumption-unlike PNP-based LDOs. Its internal bandgap reference and error amplifier provide precise feedback control, while an internally generated zero ensures stability with low-ESR ceramic capacitors as small as 2.2µF.
It integrates multiple protection functions: thermal shutdown at 160°C with 10°C hysteresis, constant-current limiting (330–770mA), and open-drain FAULT pin activation during dropout, overcurrent, or thermal overload. The SHDN pin enables logic-controlled sleep mode with 1nA supply current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±2% - ensures stable core voltage for 1.8V logic and memory without external resistors. |
| Max Output Current | 300mA - sufficient for DSP cores, microcontrollers, and RF front-end biasing in portable devices. |
| Dropout Voltage | 120mV typ @ 300mA - extends usable battery life by operating down to ~1.92V input when VOUT = 1.8V. |
| Quiescent Current | 90µA typ - minimizes standby power loss in always-on subsystems like RTC or sensor interfaces. |
| Shutdown Current | 1nA typ - enables multi-year battery operation in maintenance-free IoT endpoints. |
| Output Noise | 37µVRMS (10Hz–100kHz) - preserves signal integrity in ADC reference supplies and audio codec power rails. |
| PSRR | 60dB typ - suppresses switching noise from upstream DC/DC converters feeding the LDO input. |
| Input Voltage Range | 2.5V to 6.0V - compatible with single-cell Li-ion (2.7–4.2V), LiFePO4, or dual-cell alkaline inputs. |
Pinout & Package
LP3982ILDX-1.8 is packaged in an 8-pin LLP (Leadless Leadframe Package), measuring 2.0mm × 2.0mm × 0.55mm, with wettable flanks for automated optical inspection. This thermally enhanced, space-saving package supports high-density PCB layouts in handheld and wearable applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input Power Supply | Accepts 2.5–6.0V; requires ≥1µF ceramic input capacitor for stability. |
| 2 (GND) | Ground Reference | Common return path for input, output, and internal circuitry; must be low-impedance. |
| 3 (VOUT) | Regulated Output | Delivers fixed 1.8V; stable with ≥2.2µF ceramic output capacitor (X5R/X7R recommended). |
| 4 (FAULT) | Open-Drain Fault Indicator | Asserts low during dropout, overcurrent, or thermal shutdown; requires external 100kΩ pull-up. |
| 5 (SHDN) | Logic-Controlled Enable | Active-high enable; <0.4V = shutdown (1nA IQ), >2V = active; tolerates up to 6.5V. |
| 6 (CC) | Noise Bypass Capacitor Node | Connects to 33nF NPO/COG capacitor to reduce output noise; not used in fixed-voltage versions per datasheet note. |
| 7 (VOUT) | Secondary Output Terminal | Dual VOUT pins reduce IR drop and improve transient response under 300mA load. |
| 8 (GND) | Second Ground Terminal | Provides dedicated ground return for output current; improves PSRR and thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| PMOS Pass Transistor | Eliminates base-drive current loss, enabling 90µA quiescent current and 120mV dropout at 300mA. |
| Internal Stability Compensation | Enables use of 2.2µF ceramic output capacitors without external ESR requirements or series resistors. |
| Integrated FAULT Detection | Monitors input-to-output differential, current limit, and junction temperature to assert open-drain FAULT pin. |
| Fast Turn-On Time | 120µs typical to 90% of final output - supports rapid power sequencing in multi-rail systems. |
| Thermal Shutdown with Hysteresis | Activates at 160°C and releases at ~150°C - prevents thermal cycling damage during sustained overload. |
| ±2% Output Tolerance | Guaranteed across load (100µA–300mA), line (2.5–6.0V), and temperature (−40°C to +85°C) conditions. |
Applications
| Wireless Handset Baseband | DSP Core Power |
|---|---|
Use Scenario: Powering baseband processor cores and analog front-ends in GSM/UMTS smartphones operating from single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Primary 1.8V LDO supplying noise-sensitive digital and mixed-signal blocks with fast transient response. Use Value: 37µVRMS noise and 60dB PSRR prevent corruption of RF receive paths and ADC sampling accuracy. | Use Scenario: Delivering clean, regulated 1.8V to high-performance DSP cores in portable media players and voice-recognition modules. IC Role / Device Role / Timing Role: Low-noise, high-current LDO replacing switching regulators to avoid spectral interference in audio processing chains. Use Value: 120mV dropout allows operation until battery reaches 1.92V, extending playback time by ~12% versus higher-dropout alternatives. |
| Battery-Powered Medical Sensors | Portable Information Appliances |
Use Scenario: Powering ultra-low-power ECG/PPG sensor nodes with multi-year coin-cell battery life requirements. IC Role / Device Role / Timing Role: Micropower LDO providing 1.8V rail during active sensing and entering 1nA shutdown between measurements. Use Value: 1nA shutdown current reduces average system IQ to sub-µA levels, enabling >5-year operation on CR2032 cells. | Use Scenario: Supplying 1.8V logic and display interface in e-readers, barcode scanners, and handheld POS terminals. IC Role / Device Role / Timing Role: Compact, thermally robust LDO supporting intermittent high-current bursts (e.g., display backlight, motor drive) from slim-profile batteries. Use Value: Dual VOUT/GND pins and 223°C/W θJA (LLP) maintain safe junction temperature during 300mA pulsed loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise, micropower LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPL7407LPGDR | 300mA, 1.8V fixed, 250mV dropout @ 300mA, 25µA IQ, no FAULT pin, 5-pin SOT-23 package. | Lacks fault monitoring and dual-GND layout; suited for cost-sensitive, non-critical rails without diagnostics. | Choose when FAULT signaling is unnecessary and board area is constrained to 5-pin footprint. |
| MCP1804T-1802I/OT | 150mA, 1.8V fixed, 240mV dropout @ 150mA, 3.5µA IQ, no FAULT, SOT-23-5. | Half the output current and higher dropout; optimized for ultra-low IQ in always-on sensors, not 300mA loads. | Choose only for sub-150mA applications where 3.5µA IQ outweighs current capability and diagnostic needs. |
Compared with TPL7407LPGDR and MCP1804T-1802I/OT, LP3982ILDX-1.8 uniquely delivers 300mA output with 120mV dropout, integrated FAULT reporting, and dual-VOUT/GND terminals-making it the only option among the three suitable for noise-critical, high-current, diagnostic-enabled portable designs requiring long battery life.
Availability
LP3982ILDX-1.8 is available at Aetrix Electronics and suitable for wireless handsets, DSP core power, and portable medical sensors requiring stable component supply, consistent parametric performance, and long-term lifecycle support.
Supply support for LP3982ILDX-1.8 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 portfolio. TI is a global semiconductor leader focused on analog, embedded processing, and connectivity solutions.
The LP3982ILDX-1.8 belongs to TI's legacy micropower LDO family, designed specifically for battery-powered portable electronics demanding ultra-low noise, minimal quiescent current, and robust fault protection in compact form factors.
FAQ
What is the maximum input voltage rating for LP3982ILDX-1.8?
The absolute maximum input voltage for LP3982ILDX-1.8 is 6.5V, but the recommended operating range is 2.5V to 6.0V. Exceeding 6.5V risks permanent damage per Absolute Maximum Ratings. For reliable operation with margin, keep VIN ≤6.0V under all conditions including transients and ripple.
Does LP3982ILDX-1.8 require an external noise bypass capacitor?
Yes - LP3982ILDX-1.8 includes a dedicated CC pin (Pin 6) intended for a 33nF NPO or COG ceramic capacitor to ground. This capacitor reduces output voltage noise from 37µVRMS to lower levels; omitting it degrades noise performance but does not affect regulation stability.
Can LP3982ILDX-1.8 operate stably with a 1µF output capacitor?
No - LP3982ILDX-1.8 requires a minimum 2.2µF ceramic output capacitor for guaranteed stability across temperature and load. Using 1µF may cause oscillation or poor transient response; the datasheet specifies 2.2µF as the lowest validated value with X5R/X7R dielectrics.
What is the function of the FAULT pin on LP3982ILDX-1.8?
The FAULT pin on LP3982ILDX-1.8 is an open-drain output that pulls low during dropout (VIN–VOUT < threshold), overcurrent, or thermal shutdown. It requires an external pull-up resistor (e.g., 100kΩ) and enables system-level fault logging, safe shutdown sequencing, or reset assertion in host processors.
Is LP3982ILDX-1.8 pin-compatible with MAX8860?
Yes - LP3982ILDX-1.8 is pin, package, and specification compatible with Maxim's MAX8860 in the 8-pin MSOP package. However, LP3982ILDX-1.8 uses the LLP package; direct pin compatibility applies only when comparing against LP3982IMM-1.8 (MSOP variant), not LP3982ILDX-1.8 (LLP variant).
LP3982ILDX-1.8 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):
- 1.8V
- 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-1.8 FAQ
1.How can I place an order for LP3982ILDX-1.8 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3982ILDX-1.8 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-1.8 reliable?
The price and inventory of LP3982ILDX-1.8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3982ILDX-1.8 is usually 5 days.
3.What payment methods are accepted for LP3982ILDX-1.8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3982ILDX-1.8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3982ILDX-1.8?
LP3982ILDX-1.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3982ILDX-1.8 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-1.8?
For technical support, including LP3982ILDX-1.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3982ILDX-1.8 requirements.
6.How does Aetrix verify that LP3982ILDX-1.8 is sourced from the original manufacturer or authorized distributors?
All LP3982ILDX-1.8 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-1.8 meets industry standards.
7.What is the process for return or replacement of LP3982ILDX-1.8?
All LP3982ILDX-1.8 units undergo pre-shipment inspection (PSI). If there is an issue with LP3982ILDX-1.8, 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-1.8 part is unused and in its original packaging.
Return procedure for LP3982ILDX-1.8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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