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Texas Instruments LP3982IMM-2.5
- Part No.:
- LP3982IMM-2.5
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LP3982IMM-2.5.pdf
- Description:
- IC REG LINEAR 2.5V 300MA 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,638
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Product details
Overview
LP3982IMM-2.5 from Texas Instruments (formerly National Semiconductor) is a fixed-output 2.5V, 300mA micropower ultra low-dropout CMOS linear regulator in an 8-pin MSOP package. It delivers ±2% output voltage tolerance, 120mV typical dropout at full load, 90µA typical quiescent current, and 37µVRMS output noise (10Hz–100kHz), enabling efficient power delivery in space-constrained battery-powered systems such as wireless handsets and portable information appliances.
For engineers reviewing the LP3982IMM-2.5 datasheet, LP3982IMM-2.5 pinout, LP3982IMM-2.5 application, or LP3982IMM-2.5 equivalent, key selection criteria include its 1nA shutdown current, PMOS pass transistor architecture, stability with 2.2µF ceramic output capacitors, FAULT pin for regulation monitoring, and compatibility with Maxim MAX8860 footprint and electrical behavior-excluding reverse-battery protection and Dual Mode™ functionality.
Technical Context
The LP3982IMM-2.5 employs a PMOS pass transistor topology with internal 1.25V bandgap reference and error amplifier feedback loop, enabling ultra-low dropout operation without external drive current. Its internally generated compensation zero ensures stability with low-ESR ceramic capacitors as small as 2.2µF, eliminating reliance on capacitor ESR for loop control.
It integrates fault detection via open-drain FAULT pin that asserts low during thermal shutdown, current limit, or input-to-output differential approaching dropout; shutdown control is implemented through logic-level SHDN pin (VIH ≥2V, VIL ≤0.4V), reducing supply current to 1nA typ. Start-up time is 120µs typ with 10µF output capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V ±2% over −40°C to +85°C, supporting precise core/logic rail requirements. |
| Max Output Current | 300mA DC, sufficient for DSP cores, microcontroller I/O banks, and RF front-end biasing. |
| Dropout Voltage | 120mV typ at 300mA, enabling >95% battery energy utilization down to ~2.62V input. |
| Quiescent Current | 90µA typ at no load, minimizing standby drain in always-on subsystems like RTC or RAM keep-alive. |
| PSRR | 60dB typ at 1kHz, suppressing switching noise from upstream DC/DC converters. |
| Output Noise | 37µVRMS (10Hz–100kHz), critical for noise-sensitive analog circuits and ADC references. |
| Input Voltage Range | 2.5V to 6.0V, compatible with single-cell Li-ion (2.7–4.2V), LiFePO₄ (2.0–3.6V), and dual-cell alkaline stacks. |
| Shutdown Current | 1nA typ, enabling multi-year shelf life in sealed portable devices. |
Pinout & Package
LP3982IMM-2.5 is housed in an 8-pin MSOP (Micro Small Outline Package) with 0.65mm pitch, thermal pad exposed on underside per NSC drawing MUA08A. Package dimensions: 3.0mm × 3.0mm × 1.0mm height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input Supply | Primary power input; requires ≥1µF ceramic bypass capacitance for stability. |
| 2 (GND) | Ground Reference | Analog and power ground common node; connects to thermal pad for heat dissipation. |
| 3 (VOUT) | Regulated Output | 2.5V regulated output; stable with ≥2.2µF ceramic capacitor (X5R/X7R recommended). |
| 4 (FAULT) | Open-Drain Fault Indicator | Asserts low during thermal shutdown, current limit, or input-to-output differential < dropout threshold; requires external pull-up. |
| 5 (SHDN) | Logic-Controlled Enable | Active-high enable; 0.4V max logic low, 2V min logic high; ties directly to VIN for always-on operation. |
| 6 (CC) | Noise Bypass Input | Connects to internal bandgap reference; 33nF NPO/COG capacitor reduces output noise by filtering reference ripple. |
| 7 (VOUT) | Secondary Output Terminal | Dual VOUT pins reduce trace resistance and improve load transient response; must be shorted externally. |
| 8 (NC) | No Connect | Internally unconnected; left floating or tied to GND per layout best practice (no functional impact). |
Key Features
| Feature | Design Value |
|---|---|
| PMOS Pass Transistor | Eliminates base/gate drive current, enabling ultra-low IQ and simplifying bias design vs. PNP-based LDOs. |
| Internal Compensation Zero | Enables unconditional stability with 2.2µF ceramic output capacitors-no ESR dependency or external components required. |
| FAULT Pin Monitoring | Provides system-level fault visibility for thermal, overload, and near-dropout conditions-enables graceful shutdown or alert logging. |
| Fast 120µs Turn-On | Minimizes power-up delay in wake-from-sleep sequences; unaffected by optional CC capacitor sizing. |
| ±2% Output Tolerance | Guaranteed accuracy across temperature and load enables direct replacement of precision references without trimming. |
| 1nA Shutdown Mode | Reduces total system standby current to nanoampere range-critical for long-life coin-cell or energy-harvesting applications. |
Applications
| Wireless Handset Baseband | DSP Core Power |
|---|---|
Use Scenario: Powering baseband processor I/O banks and analog front-end circuitry in GSM/UMTS smartphones with single-cell Li-ion battery input. IC Role / Device Role / Timing Role: Primary 2.5V LDO delivering clean, low-noise supply with fast transient response to handle burst-mode transmission loads. Use Value: 120mV dropout extends usable battery voltage range to 2.62V, adding >15 minutes talk time; 37µVRMS noise prevents SNR degradation in RF receivers. | Use Scenario: Supplying fixed 2.5V rail to low-power DSP cores in portable audio recorders and voice-enabled IoT edge nodes. IC Role / Device Role / Timing Role: Micropower LDO providing regulated core voltage during active processing and entering 1nA shutdown between voice activity windows. Use Value: 90µA quiescent current minimizes idle power draw; FAULT pin alerts firmware of thermal stress during sustained FFT computation. |
| Battery-Powered Medical Sensors | Portable Information Appliances |
Use Scenario: Powering ultra-low-power ECG front-end ASICs and BLE transceivers in wearable patch monitors powered by CR2032 coin cells. IC Role / Device Role / Timing Role: Precision 2.5V regulator maintaining ±2% output under varying battery discharge curve and temperature drift. Use Value: 2.5V output matches ADC reference inputs; 60dB PSRR rejects noise from BLE radio switching; 1nA shutdown preserves multi-month shelf life. | Use Scenario: Supplying main logic rail in handheld barcode scanners and industrial PDAs using dual AA/AAA alkaline batteries (2.4–3.2V input). IC Role / Device Role / Timing Role: High-efficiency LDO converting variable alkaline stack voltage to stable 2.5V for microcontroller and display driver ICs. Use Value: 120mV dropout allows operation down to 2.62V input-extending device runtime beyond conventional 3.0V LDOs by ~20%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise, micropower LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8860EUB25+T | Pin- and package-compatible; identical 2.5V output, 300mA rating, and 120mV dropout-but lacks FAULT pin and CC noise-bypass terminal. | No integrated fault reporting; requires external monitoring circuitry for thermal/current events. | Select when footprint compatibility is mandatory and fault visibility is handled elsewhere in system design. |
| TPL7407LADGKR | 2.5V fixed, 300mA, 125mV dropout, 25µA IQ-but uses NMOS pass device, requiring ≥2.7V input minimum and lacking true shutdown (1µA sleep). | Higher minimum input voltage limits use with deeply discharged Li-ion; no 1nA shutdown mode. | Select when ultra-low IQ is secondary to cost and board area; avoid in coin-cell or deep-discharge battery systems. |
Compared with LP3982IMM-2.5, MAX8860EUB25+T offers identical mechanical and basic electrical fit but omits fault monitoring, while TPL7407LADGKR trades 65× higher shutdown current and 0.2V higher VINMIN for lower quiescent current in active mode-making LP3982IMM-2.5 optimal for battery longevity and system-level reliability in portable medical and communication devices.
Availability
LP3982IMM-2.5 is available at Aetrix Electronics and suitable for wireless handset baseband power, DSP core supply, and portable medical sensor applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LP3982IMM-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. TI is a global semiconductor leader focused on analog, embedded processing, and connectivity solutions.
The LP3982IMM-2.5 belongs to National's legacy micropower LDO family, engineered specifically for ultra-low-noise, ultra-low-IQ battery-powered applications where extended runtime, small footprint, and regulation integrity under dynamic load are critical.
FAQ
What is the minimum input voltage required for LP3982IMM-2.5 to regulate at 2.5V output?
The LP3982IMM-2.5 requires a minimum input voltage of 2.5V per Absolute Maximum Ratings and Operating Ratings tables. However, to maintain regulation under 300mA load, VIN must exceed VOUT by at least the dropout voltage-120mV typ, so ≥2.62V is required for full-load operation. At lighter loads, dropout decreases (e.g., 0.4mV at 1mA), allowing regulation closer to 2.5V input.
Does LP3982IMM-2.5 require an external capacitor on the CC pin, and what happens if it is omitted?
Yes, LP3982IMM-2.5 requires a 33nF NPO or COG ceramic capacitor between CC (Pin 6) and GND to achieve its specified 37µVRMS output noise. Omitting it increases broadband noise by ~2× and degrades PSRR above 10kHz. The CC pin connects directly to the high-impedance bandgap reference; leakage in non-NPO dielectrics can also shift output voltage.
Can LP3982IMM-2.5 be used with a 1µF input capacitor, and is a tantalum capacitor recommended?
LP3982IMM-2.5 requires a minimum 1µF ceramic input capacitor for stability in most end-use applications. Tantalum capacitors (e.g., 10µF) are only recommended for bench testing with long supply leads to dampen inductive ringing-due to their failure-in-short-circuit risk, they are not advised for production use. Ceramic remains preferred for reliability and ESR consistency.
How does the FAULT pin on LP3982IMM-2.5 behave during thermal shutdown, and what external component is needed?
The FAULT pin on LP3982IMM-2.5 is an open-drain output that pulls low during thermal shutdown, current limit, or when input-to-output differential falls within ~50mV of dropout. It requires an external pull-up resistor-100kΩ is recommended-to minimize current draw while ensuring clean logic-level signaling to host microcontrollers or supervisors.
Is LP3982IMM-2.5 compatible with the MAX8860 footprint, and are there functional differences?
Yes, LP3982IMM-2.5 is pin-, package-, and specification-compatible with Maxim MAX8860EUB25+T in 8-pin µMAX (equivalent to MSOP). Key functional differences include LP3982IMM-2.5's integrated FAULT pin and CC noise-bypass terminal-features absent in MAX8860-which provide enhanced system monitoring and lower output noise without additional components.
LP3982IMM-2.5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- 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-VSSOP
LP3982IMM-2.5 FAQ
1.How can I place an order for LP3982IMM-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3982IMM-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 LP3982IMM-2.5 reliable?
The price and inventory of LP3982IMM-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 LP3982IMM-2.5 is usually 5 days.
3.What payment methods are accepted for LP3982IMM-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3982IMM-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3982IMM-2.5?
LP3982IMM-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3982IMM-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 LP3982IMM-2.5?
For technical support, including LP3982IMM-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3982IMM-2.5 requirements.
6.How does Aetrix verify that LP3982IMM-2.5 is sourced from the original manufacturer or authorized distributors?
All LP3982IMM-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 LP3982IMM-2.5 meets industry standards.
7.What is the process for return or replacement of LP3982IMM-2.5?
All LP3982IMM-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LP3982IMM-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 LP3982IMM-2.5 part is unused and in its original packaging.
Return procedure for LP3982IMM-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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