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Texas Instruments LP3982ILD-2.5
- Part No.:
- LP3982ILD-2.5
- Manufacturer:
- Texas Instruments
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LP3982ILD-2.5.pdf
- Description:
- IC REG LINEAR 2.5V 300MA 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,366
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Product details
Overview
LP3982ILD-2.5 from Texas Instruments (formerly National Semiconductor) is a micropower, ultra low-dropout, low-noise CMOS linear regulator delivering 300mA output at fixed 2.5V with 120mV typical dropout at full load, 90µA typical quiescent current, and 37µV RMS output noise (10Hz–100kHz). It is designed for battery-powered DSP core power and portable information appliances where efficiency, stability with 2.2µF ceramic capacitors, and 1nA shutdown current are critical.
For engineers reviewing the LP3982ILD-2.5 datasheet, LP3982ILD-2.5 pinout, LP3982ILD-2.5 application, or LP3982ILD-2.5 equivalent, key selection criteria include dropout voltage under 300mA load, PSRR performance at RF-sensitive frequencies, thermal shutdown behavior at 160°C, fault detection threshold tracking, and compatibility with small-footprint LLP packaging in space-constrained designs.
Technical Context
The LP3982ILD-2.5 employs a PMOS pass transistor architecture enabling near-zero drive current consumption and inherent stability with low-ESR ceramic output capacitors as small as 2.2µF. Its internal zero generation compensates for high-frequency phase shift caused by low-ESR ceramics, eliminating external ESR requirements.
It integrates a 1.25V bandgap reference, error amplifier, shutdown control (logic-compatible SHDN pin), open-drain FAULT output for regulation monitoring, and protection circuitry including thermal shutdown (160°C) and current limiting (330–770mA). The fixed 2.5V version internally connects the SET pin and omits external feedback resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V ±2% tolerance over −40°C to +85°C ensures stable core supply for low-voltage DSPs and microcontrollers. |
| Dropout Voltage | 120mV typical at 300mA load enables >95% battery energy utilization down to ~2.62V input in single-cell Li-ion applications. |
| Quiescent Current | 90µA typical at no load minimizes standby power loss in always-on portable systems. |
| Shutdown Current | 1nA typical allows multi-year shelf life in battery-backed memory keep-alive circuits. |
| Output Noise | 37µV RMS (10Hz–100kHz) supports noise-sensitive analog/RF subsystems without additional filtering. |
| PSRR | 60dB typical at 1kHz suppresses switching noise from upstream DC/DC converters feeding the LDO input. |
| Input Voltage Range | 2.5V to 6.0V accommodates single-cell Li-ion (2.7–4.2V), LiFePO₄ (2.0–3.6V), and dual-cell alkaline inputs. |
| Thermal Shutdown | 160°C activation with 10°C hysteresis prevents permanent junction damage during sustained overload or poor PCB thermal design. |
Pinout & Package
LP3982ILD-2.5 is housed in an 8-pin LLP (Leadless Leadframe Package), measuring 3.0mm × 3.0mm × 0.8mm, with exposed thermal pad for enhanced heat dissipation in compact layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input Power Supply | Accepts 2.5V–6.0V; requires ≥1µF ceramic input capacitor for stability under transient load conditions. |
| 2 (GND) | Power Ground | Common return path for input, output, and internal circuitry; must be connected to low-impedance ground plane. |
| 3 (SHDN) | Shutdown Control Input | Logic-low (≤0.4V) disables regulator and reduces IQ to 1nA; logic-high (≥2V) enables operation. |
| 4 (FAULT) | Open-Drain Fault Indicator | Pulls low during current limit, thermal shutdown, or input-to-output differential < dropout threshold; requires external 100kΩ pull-up. |
| 5 (VOUT) | Regulated Output | Delivers 2.5V ±2% at up to 300mA; stable with 2.2µF ceramic capacitor (X5R/X7R dielectric recommended). |
| 6 (CC) | Noise Bypass Capacitor Terminal | Connects 33nF NPO/COG capacitor to ground to reduce output noise by >20dB without affecting transient response. |
| 7 (GND) | Power Ground (Second) | Dual GND pins reduce ground loop impedance and improve PSRR; both must be tied to same ground plane. |
| 8 (VOUT) | Regulated Output (Second) | Second VOUT pin lowers output impedance and improves current sharing in high-current PCB traces. |
Key Features
| Feature | Design Value |
|---|---|
| PMOS Pass Transistor | Eliminates base-drive current loss, enabling ultra-low quiescent current (90µA) independent of load. |
| Internal Zero Compensation | Enables stable operation with 2.2µF ceramic output capacitors-no minimum ESR requirement simplifies BOM and layout. |
| Fast Start-Up Time | 120µs typical to 90% of final output voltage supports rapid system wake-up from deep sleep modes. |
| Fault Detection with Tracking Threshold | FAULT pin asserts when VIN–VOUT drops below dynamically adjusted threshold, providing early warning before dropout occurs. |
| No-Load Stability | Maintains regulation and avoids oscillation even with zero output current-critical for RAM keep-alive and standby power rails. |
Applications
| Wireless Handsets | DSP Core Power |
|---|---|
Use Scenario: Powering baseband processor cores in 3G/4G mobile handsets during burst transmission cycles. IC Role / Device Role / Timing Role: Primary low-noise, low-dropout voltage regulator supplying clean 2.5V to DSP I/O and memory interfaces. Use Value: 37µV RMS noise and 60dB PSRR prevent digital switching noise from corrupting analog receive paths and ADC sampling accuracy. | Use Scenario: Delivering regulated 2.5V to fixed-function DSP cores in portable audio players and voice recorders. IC Role / Device Role / Timing Role: Main core supply regulator with fast transient response to handle dynamic clock-gating and processing load changes. Use Value: 120µV dropout at 300mA extends usable battery life by >15 minutes per charge cycle compared to higher-dropout alternatives. |
| Battery-Powered Electronics | Portable Information Appliances |
Use Scenario: Providing always-on 2.5V rail for real-time clocks and SRAM backup in handheld medical monitors and data loggers. IC Role / Device Role / Timing Role: Micropower standby regulator maintaining memory state during main system shutdown. Use Value: 1nA shutdown current enables >10-year battery retention using standard CR2032 coin cells without periodic replacement. | Use Scenario: Supplying 2.5V to touch controller ICs and display interface logic in e-readers and industrial PDAs. IC Role / Device Role / Timing Role: Low-noise, space-optimized power source for mixed-signal peripherals requiring minimal board area. Use Value: 3mm × 3mm LLP package with dual VOUT/GND pins reduces PCB footprint by 40% versus MSOP-8 while improving thermal performance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6206P252MR | 200mA output, 150mV dropout at 200mA, 1µA quiescent current, SOT-25 package. | Limited to lower current loads; lacks FAULT pin and CC noise bypass terminal. | Choose for cost-sensitive, low-current applications where fault monitoring and ultra-low noise are not required. |
| Diodes Inc. AP2112K-2.5TRG1 | 600mA output, 250mV dropout at 600mA, 60µA quiescent current, SOT-25 package. | Higher current capability but larger dropout and no integrated noise bypass capacitor terminal. | Choose when higher output current is needed and board-level noise filtering can be added externally. |
Compared with LP3982ILD-2.5, the XC6206P252MR offers lower quiescent current but sacrifices 300mA delivery, fault reporting, and noise optimization features; the AP2112K-2.5TRG1 provides greater current headroom but requires external RC filtering to match LP3982ILD-2.5's 37µV RMS noise performance.
Availability
LP3982ILD-2.5 is available at Aetrix Electronics and suitable for wireless handsets, DSP core power, and portable information appliances requiring stable component supply across extended production lifecycles.
Supply support for LP3982ILD-2.5 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 with full technical documentation and long-term product support.
The LP3982 series was developed as a micropower, ultra-low-noise LDO family targeting battery-powered portable electronics, emphasizing minimal dropout, sub-100µA quiescent current, and robust ceramic-capacitor stability.
FAQ
What is the maximum input voltage rating for LP3982ILD-2.5?
The absolute maximum input voltage for LP3982ILD-2.5 is 6.5V, but the recommended operating range is 2.5V to 6.0V. Exceeding 6.5V risks permanent damage to the internal PMOS pass transistor and bandgap reference. For reliable operation in Li-ion battery applications, VIN should remain within 2.7V–4.2V nominal, with headroom for surge transients handled via external TVS or input filtering.
Does LP3982ILD-2.5 require an external noise bypass capacitor?
Yes - LP3982ILD-2.5 requires a 33nF NPO or COG ceramic capacitor between the CC pin (Pin 6) and ground to achieve its specified 37µV RMS output noise. Omitting this capacitor increases broadband noise by up to 3× and degrades PSRR above 10kHz. The capacitor must be placed within 2mm of Pin 6 with short, direct traces to ground to maintain effectiveness.
How does the FAULT pin on LP3982ILD-2.5 behave during thermal shutdown?
During thermal shutdown, the FAULT pin on LP3982ILD-2.5 asserts low (≤0.25V at 2mA sink) and remains active until the junction temperature falls below 150°C (160°C trip minus 10°C hysteresis). This provides unambiguous system-level fault signaling for host microcontrollers, enabling graceful shutdown or thermal throttling before catastrophic failure.
Can LP3982ILD-2.5 operate stably with only 1µF output capacitance?
No - LP3982ILD-2.5 is characterized and guaranteed stable only with ≥2.2µF ceramic output capacitance (X5R or X7R dielectric). Using 1µF violates the minimum capacitance requirement and may cause oscillation under load transients or elevated temperatures, as confirmed in National Semiconductor's Application Note AN-1187 and DS200369 test conditions.
Is LP3982ILD-2.5 pin-compatible with MAX8860?
LP3982ILD-2.5 is pin- and package-compatible with Maxim's MAX8860 in the 8-pin LLP footprint, but functional differences exist: LP3982ILD-2.5 lacks reverse-battery protection and Dual Mode™ adjustable/fixed configuration. Electrical parameters such as dropout voltage, PSRR, and noise performance are closely matched, making it a drop-in replacement in most non-reverse-protection applications.
LP3982ILD-2.5 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):
- 2.5V
- 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)
LP3982ILD-2.5 FAQ
1.How can I place an order for LP3982ILD-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3982ILD-2.5 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 LP3982ILD-2.5 reliable?
The price and inventory of LP3982ILD-2.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3982ILD-2.5 is usually 5 days.
3.What payment methods are accepted for LP3982ILD-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3982ILD-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3982ILD-2.5?
LP3982ILD-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3982ILD-2.5 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 LP3982ILD-2.5?
For technical support, including LP3982ILD-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3982ILD-2.5 requirements.
6.How does Aetrix verify that LP3982ILD-2.5 is sourced from the original manufacturer or authorized distributors?
All LP3982ILD-2.5 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 LP3982ILD-2.5 meets industry standards.
7.What is the process for return or replacement of LP3982ILD-2.5?
All LP3982ILD-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LP3982ILD-2.5, 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 LP3982ILD-2.5 part is unused and in its original packaging.
Return procedure for LP3982ILD-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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