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Texas Instruments LP3982IMMX-2.5/NOPB
- Part No.:
- LP3982IMMX-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LP3982IMMX-2.5/NOPB.pdf
- Description:
- IC REG LINEAR 2.5V 300MA 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,487
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Product details
Overview
LP3982IMMX-2.5/NOPB 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 37µVRMS output noise (10Hz–100kHz). It is designed for battery-powered DSP core power and portable information appliances where efficiency and noise sensitivity are critical.
For engineers reviewing the LP3982IMMX-2.5/NOPB datasheet, LP3982IMMX-2.5/NOPB pinout, LP3982IMMX-2.5/NOPB application, or LP3982IMMX-2.5/NOPB equivalent, key selection criteria include guaranteed 300mA output under 2.5V–6V input, ±2% output voltage tolerance, 1nA shutdown current, fault detection capability, and stability with 2.2µF ceramic output capacitors.
Technical Context
The LP3982IMMX-2.5/NOPB employs a PMOS pass transistor architecture enabling ultra-low dropout and near-zero drive current consumption-unlike PNP-based LDOs. Its internal bandgap reference, error amplifier, and fault comparator support regulation fault detection, thermal shutdown at 160°C, and overcurrent limiting (330–770mA).
Stability is ensured via an internally generated compensation zero that enables robust operation with low-ESR ceramic capacitors as small as 2.2µF. The device features a dedicated FAULT open-drain output (active-low during dropout, thermal shutdown, or current limit) and SHDN control with 0.4V logic-low threshold and 2V logic-high threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V ±2% - ensures stable core supply for 2.5V logic domains without external feedback components. |
| Max Output Current | 300mA - sufficient to power DSP cores, microcontroller I/O banks, or RF front-end bias circuits. |
| Dropout Voltage | 120mV typ @ 300mA - extends usable battery life by maintaining regulation down to VIN = 2.62V. |
| Quiescent Current | 90µA typ - minimizes standby power loss in always-on subsystems such as real-time clocks or RAM keep-alive. |
| Shutdown Current | 1nA typ - enables multi-year shelf life in battery-backed applications with infrequent wake-up cycles. |
| Output Noise | 37µVRMS (10Hz–100kHz) - meets stringent analog/RF supply requirements without additional filtering. |
| 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 (2.0–3.6V), or dual-cell alkaline (2.4–3.2V) sources. |
Pinout & Package
LP3982IMMX-2.5/NOPB is housed in an 8-pin MSOP package (NSC drawing MUA08A), measuring 3.0mm × 3.0mm × 1.0mm, with exposed thermal pad for enhanced power dissipation (θJA = 223°C/W, no airflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input Supply | Accepts 2.5V–6.0V input; requires ≥1µF ceramic decoupling close to pin. |
| 2 (GND) | Ground Reference | Primary ground return for regulator circuitry and thermal pad connection point. |
| 3 (FAULT) | Fault Indicator Output | Open-drain active-low signal asserting during dropout, thermal shutdown, or current limit; requires external pull-up. |
| 4 (SHDN) | Shutdown Control | Logic input: ≤0.4V disables regulator (1nA IQ); ≥2V enables operation. |
| 5 (VOUT) | Regulated Output | Delivers fixed 2.5V ±2% at up to 300mA; stable with ≥2.2µF ceramic capacitor. |
| 6 (CC) | Noise Bypass | Connects to 33nF NPO/COG capacitor to reduce output noise; directly ties to bandgap reference node. |
| 7 (VOUT) | Secondary Output | Dual VOUT pins (pins 5 & 7) reduce trace resistance and improve current sharing in high-current PCB layouts. |
| 8 (NC) | No Connect | Internally unconnected; must remain floating or grounded per layout best practice (not tied to signal nets). |
Key Features
| Feature | Design Value |
|---|---|
| PMOS Pass Transistor | Eliminates base-drive current loss, enabling 90µA quiescent current and compatibility with low-input-voltage battery states. |
| Internal Compensation Zero | Enables stable regulation with 2.2µF ceramic output capacitors-no ESR dependency or external compensation required. |
| FAULT Pin with Dropout Tracking | Monitors input-to-output differential in real time and asserts before regulation loss, supporting predictive system-level fault handling. |
| Fast Start-Up Time | 120µs typical to 90% of final output-minimizes delay in power-on sequencing for time-critical embedded systems. |
| Thermal Shutdown with Hysteresis | Triggers at 160°C junction temperature and releases at ~150°C, preventing thermal cycling during sustained overload conditions. |
Applications
| Wireless Handsets | DSP Core Power |
|---|---|
Use Scenario: Powering baseband processor and RF transceiver subsystems in GSM/UMTS handsets operating from single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Primary 2.5V LDO supplying clean, low-noise voltage to sensitive analog and mixed-signal blocks. Use Value: 37µVRMS noise and 60dB PSRR prevent corruption of RF receive sensitivity and ADC sampling accuracy. | Use Scenario: Delivering regulated 2.5V supply to digital signal processor cores requiring tight voltage tolerance and fast transient response. IC Role / Device Role / Timing Role: Low-dropout post-regulator following a higher-efficiency DC/DC converter to meet DSP core VDD requirements. Use Value: 120mV dropout allows operation down to 2.62V input, maximizing battery utilization during discharge cycles. |
| Battery-Powered Electronics | Portable Information Appliances |
Use Scenario: Power management in handheld medical monitors, barcode scanners, or portable test equipment with long shelf-life requirements. IC Role / Device Role / Timing Role: Micropower LDO enabling multi-year operation on primary lithium cells with minimal self-discharge impact. Use Value: 1nA shutdown current preserves battery capacity during extended storage or sleep modes. | Use Scenario: Supplying 2.5V rails to LCD controllers, touch-screen interface ICs, and flash memory in e-readers and PDAs. IC Role / Device Role / Timing Role: Fixed-output LDO providing stable, low-noise voltage for display and memory subsystems with variable load profiles. Use Value: Dual VOUT pins (pins 5 & 7) reduce IR drop and improve voltage regulation under dynamic load steps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPL7407LPGEDR | 7-channel 200mA NMOS array with integrated drivers; not a single-channel 300mA LDO; lacks FAULT pin and 37µV noise spec. | Targeted at LED/relay driving-not precision low-noise regulation; unsuitable for DSP core or RF supply. | Select only if driving discrete loads is primary requirement; not a functional substitute for LP3982IMMX-2.5/NOPB. |
| TPS7A2025PDQNR | 300mA, 2.5V fixed LDO with 165mV dropout @ 300mA, 65µA IQ, 12µVRMS noise, and no FAULT pin. | Superior noise performance but missing fault reporting; requires different PCB layout due to 5-pin X2SON package. | Prefer when ultra-low noise dominates over fault diagnostics; verify system-level fault handling exists elsewhere. |
Compared with LP3982IMMX-2.5/NOPB, TPS7A2025PDQNR offers lower noise and quiescent current but omits FAULT signaling and uses a non-pin-compatible package, while TPL7407LPGEDR serves a fundamentally different function-making LP3982IMMX-2.5/NOPB uniquely suited for battery-powered systems needing integrated fault awareness, low dropout, and proven 2.2µF ceramic stability.
Availability
LP3982IMMX-2.5/NOPB is available at Aetrix Electronics and suitable for wireless handsets, DSP core power, and portable information appliances requiring stable component supply across production lifecycles.
Supply support for LP3982IMMX-2.5/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 legacy analog portfolio, including precision power management ICs with emphasis on reliability and automotive-grade qualification.
The LP3982IMMX-2.5/NOPB belongs to TI's legacy micropower LDO family, engineered specifically for battery-constrained portable electronics demanding ultra-low IQ, low noise, and intelligent fault monitoring in compact form factors.
FAQ
What is the maximum input voltage rating for LP3982IMMX-2.5/NOPB?
The absolute maximum input voltage for LP3982IMMX-2.5/NOPB 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 circuitry. For reliable long-term operation, maintain VIN within the specified 2.5V–6.0V window, especially under thermal stress or high load conditions. LP3982IMMX-2.5/NOPB must never be subjected to reverse polarity or transient spikes beyond this limit.
Does LP3982IMMX-2.5/NOPB require an external capacitor on the CC pin?
Yes, LP3982IMMX-2.5/NOPB requires a 33nF NPO or COG ceramic capacitor between the CC pin (pin 6) and ground to achieve its specified 37µVRMS output noise performance. This capacitor connects directly to the high-impedance bandgap reference node, and using alternatives like X7R or high-leakage dielectrics degrades regulation accuracy and increases noise. Omitting the CC capacitor results in measurable noise increase-up to 2× higher RMS value-and compromises low-noise operation critical for analog/RF subsystems powered by LP3982IMMX-2.5/NOPB.
Can LP3982IMMX-2.5/NOPB operate stably with a 1µF output capacitor?
No, LP3982IMMX-2.5/NOPB is not guaranteed stable with a 1µF output capacitor. The datasheet specifies minimum 2.2µF ceramic capacitance for guaranteed stability across temperature and load conditions. Using 1µF may cause oscillation or excessive ringing during load transients due to insufficient phase margin from the internal compensation zero. LP3982IMMX-2.5/NOPB's stability architecture is optimized for ≥2.2µF, and deviating below this value voids the stability guarantee-even if bench testing appears acceptable under narrow conditions.
What is the purpose of the NC pin on LP3982IMMX-2.5/NOPB?
The NC (No Connect) pin on LP3982IMMX-2.5/NOPB (pin 8) is internally unconnected and serves no electrical function. It must not be tied to any signal net, power rail, or ground plane. Best practice is to leave it floating or optionally connect it to ground solely for mechanical anchoring-never for thermal or electrical purposes. Routing traces to or from pin 8 violates the manufacturer's layout guidance and may introduce parasitic coupling that affects FAULT pin integrity or noise performance of LP3982IMMX-2.5/NOPB.
How does the FAULT pin on LP3982IMMX-2.5/NOPB behave during thermal shutdown?
During thermal shutdown, the FAULT pin on LP3982IMMX-2.5/NOPB asserts low (≤0.25V at 2mA sink) and remains latched low until junction temperature falls below the hysteresis threshold (~150°C). This behavior is identical to its response during current limit or input-to-output differential violation. The FAULT pin is open-drain, so an external pull-up resistor (e.g., 100kΩ to VIN) is mandatory to establish a valid logic-high state when inactive. LP3982IMMX-2.5/NOPB's FAULT output thus provides unambiguous, system-visible indication of all three fault conditions without requiring additional monitoring circuitry.
LP3982IMMX-2.5/NOPB 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:
- Active
- 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
LP3982IMMX-2.5/NOPB FAQ
1.How can I place an order for LP3982IMMX-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3982IMMX-2.5/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 LP3982IMMX-2.5/NOPB reliable?
The price and inventory of LP3982IMMX-2.5/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3982IMMX-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LP3982IMMX-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3982IMMX-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3982IMMX-2.5/NOPB?
LP3982IMMX-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3982IMMX-2.5/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 LP3982IMMX-2.5/NOPB?
For technical support, including LP3982IMMX-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3982IMMX-2.5/NOPB requirements.
6.How does Aetrix verify that LP3982IMMX-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3982IMMX-2.5/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 LP3982IMMX-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LP3982IMMX-2.5/NOPB?
All LP3982IMMX-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3982IMMX-2.5/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 LP3982IMMX-2.5/NOPB part is unused and in its original packaging.
Return procedure for LP3982IMMX-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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