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Texas Instruments LP3982IMM-2.82/NOPB
- Part No.:
- LP3982IMM-2.82/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LP3982IMM-2.82/NOPB.pdf
- Description:
- IC REG LINEAR 2.82V 300MA 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,250
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Product details
Overview
LP3982IMM-2.82/NOPB from Texas Instruments (formerly National Semiconductor) is a fixed-output 2.82V, 300mA micropower ultra-low-dropout CMOS linear regulator in an 8-pin MSOP package. It features 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-2.82/NOPB datasheet, LP3982IMM-2.82/NOPB pinout, LP3982IMM-2.82/NOPB application, or LP3982IMM-2.82/NOPB equivalent, key selection criteria include its 1nA shutdown current, ±2% output voltage tolerance, PMOS pass transistor architecture, stability with 2.2µF ceramic output capacitors, and FAULT pin for regulation fault detection.
Technical Context
The LP3982IMM-2.82/NOPB employs a PMOS pass transistor topology with internal 1.25V bandgap reference and error amplifier, delivering precise low-noise regulation without external feedback resistors. Its internally generated compensation zero enables stable operation with low-ESR ceramic capacitors as small as 2.2µF-eliminating reliance on ESR-dependent loop stabilization.
Functional integration includes active fault monitoring (input-to-output differential, thermal overload, and current limit), logic-controlled shutdown (0.4V max low threshold, 2V min high threshold), and fast 120µs turn-on time with optional 33nF noise-bypass capacitor on the reference node. The FAULT pin is open-drain and requires external pull-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.82V ±2% - ensures stable core supply for DSPs or baseband ICs requiring tight voltage accuracy. |
| Max Output Current | 300mA - supports moderate-power RF front-ends or microcontroller subsystems without derating. |
| Dropout Voltage | 120mV typ @ 300mA - extends usable battery life by maintaining regulation down to VIN = 2.94V. |
| Quiescent Current | 90µA typ - minimizes standby drain in always-on circuits like real-time clocks or RAM keep-alive. |
| Shutdown Current | 1nA typ - enables multi-year shelf life in battery-backed devices with infrequent wake cycles. |
| Output Noise | 37µVRMS (10Hz–100kHz) - preserves signal integrity in sensitive analog sections (e.g., ADC references, audio codecs). |
| PSRR | 60dB typ @ 1kHz - 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), Li-polymer, or dual-cell alkaline inputs. |
Pinout & Package
LP3982IMM-2.82/NOPB is housed in an 8-pin MSOP (Micro Small Outline Package) with 0.65mm pitch, measuring 3.0mm × 3.0mm × 1.0mm. This thermally enhanced surface-mount package supports PCB-level heat dissipation via exposed pad (per NSC MUA08A drawing) and is RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input Power 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 path to PCB plane. |
| 3 (FAULT) | Open-Drain Fault Indicator | Asserts low during dropout, overcurrent, or thermal shutdown; requires external pull-up resistor (e.g., 100kΩ). |
| 4 (SHDN) | Logic-Controlled Shutdown | Active-low enable: <0.4V = off (1nA IQ), >2V = on; tolerates voltage up to 6.5V. |
| 5 (VOUT) | Main Output Terminal | Delivers regulated 2.82V; connects to 2.2µF ceramic output capacitor for stability. |
| 6 (CC) | Noise Bypass Node | Connects 33nF NPO/COG capacitor to ground to reduce output noise by filtering bandgap reference. |
| 7 (VOUT) | Secondary Output Terminal | Dual VOUT pins reduce IR drop and improve transient response under dynamic load. |
| 8 (SET) | Feedback Input (Fixed Mode) | Internally connected to output for fixed versions; no external connection required. |
Key Features
| Feature | Design Value |
|---|---|
| PMOS Pass Transistor | Eliminates PNP base-drive current, enabling ultra-low quiescent current independent of load. |
| Internal Zero Compensation | Enables stable regulation with 2.2µF ceramic capacitors-no ESR dependency or external compensation needed. |
| Regulation Fault Detection | FAUT pin monitors input-output differential, thermal state, and current limit-provides system-level health awareness. |
| Fast Turn-On Time | 120µs to 90% of final output with CC capacitor-supports rapid power sequencing in multi-rail systems. |
| Low-Noise Reference Bypass | CC pin allows direct 33nF bypass of 1.25V bandgap-reduces RMS noise by >50% versus unbypassed operation. |
| Thermal Shutdown with Hysteresis | Triggers at 160°C junction temperature and releases at ~150°C-prevents thermal cycling damage during overload. |
Applications
| Wireless Handset Baseband | DSP Core Power |
|---|---|
Use Scenario: Powers baseband processor and RF transceiver ICs in GSM/UMTS smartphones operating from single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Primary low-noise, low-dropout post-regulator delivering clean 2.82V to sensitive mixed-signal blocks. Use Value: 120mV dropout extends talk time by 8–12% compared to higher-dropout regulators when battery voltage falls below 3.0V. | Use Scenario: Supplies voltage to digital signal processor cores requiring tightly regulated, low-noise bias in portable audio recorders. IC Role / Device Role / Timing Role: Fixed-output LDO providing stable 2.82V rail with minimal PSRR-induced jitter on clock domains. Use Value: 37µVRMS noise and 60dB PSRR prevent spectral contamination in 24-bit audio ADC/DAC paths. |
| Battery-Powered Medical Sensors | Portable Information Appliances |
Use Scenario: Powers ultra-low-power physiological sensor nodes (e.g., ECG front-end) with multi-year battery life requirements. IC Role / Device Role / Timing Role: Always-on supply regulator with 1nA shutdown mode activated between measurement intervals. Use Value: Sub-1nA shutdown current enables CR2032 coin cell operation for >5 years in intermittent-sampling applications. | Use Scenario: Delivers main system voltage to handheld PDAs and e-readers using dual-cell alkaline or Li-ion sources. IC Role / Device Role / Timing Role: Main system LDO supporting 300mA peak loads during display refresh and flash memory writes. Use Value: Dual VOUT pins and 300mA rating ensure <10mV load transient deviation during 200mA step changes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8860EUB28+T | Pin- and package-compatible; same 2.8V output, but ±2.5% tolerance and 150mV dropout @ 300mA. | Lacks FAULT pin and noise-bypass (CC) capability; lower PSRR (45dB @ 1kHz). | Choose MAX8860EUB28+T only if FAULT monitoring and sub-40µV noise are not required. |
| TLS850F2TE/V33 | Automotive-grade AEC-Q100 qualified; 2.8V output, 500mA rating, but 250mV dropout and 35µA IQ. | Includes watchdog timer and reset functionality; designed for 12V automotive input with integrated protection. | Select TLS850F2TE/V33 only for automotive environments requiring extended temperature range and functional safety features. |
Compared with LP3982IMM-2.82/NOPB, the MAX8860EUB28+T offers mechanical compatibility but sacrifices fault visibility and noise performance, while the TLS850F2TE/V33 adds automotive robustness at the cost of higher dropout and quiescent current-making LP3982IMM-2.82/NOPB optimal for consumer portable designs prioritizing battery life and signal purity.
Availability
LP3982IMM-2.82/NOPB is available at Aetrix Electronics and suitable for wireless handsets, DSP core power, and portable information appliances requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LP3982IMM-2.82/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 precision analog portfolio. TI is a global semiconductor leader focused on analog, embedded processing, and connectivity technologies.
The LP3982IMM-2.82/NOPB belongs to National Semiconductor's micropower LDO family, engineered specifically for battery-operated portable electronics where ultra-low IQ, low noise, and minimal dropout are critical to runtime and signal fidelity.
FAQ
What is the guaranteed output voltage tolerance for LP3982IMM-2.82/NOPB?
The LP3982IMM-2.82/NOPB has a guaranteed output voltage tolerance of ±2% across temperature (−40°C to +85°C) and load (100µA to 300mA), with typical performance tighter at ±1%. This specification is verified per National Semiconductor DS200369, ensuring reliable core voltage delivery for DSPs and baseband ICs without external trimming.
Does LP3982IMM-2.82/NOPB require an external capacitor on the CC pin?
Yes, LP3982IMM-2.82/NOPB achieves its specified 37µVRMS output noise only when a 33nF NPO or COG ceramic capacitor is connected between the CC pin (Pin 6) and ground. Omitting this capacitor increases RMS noise to ~75µV; the capacitor must be placed directly at the pin with short traces to preserve high-frequency filtering effectiveness.
Can LP3982IMM-2.82/NOPB operate stably with a 1µF output capacitor?
No, LP3982IMM-2.82/NOPB is characterized and guaranteed stable only with ≥2.2µF ceramic output capacitance. Using 1µF violates the minimum stability condition stated in DS200369 and may cause oscillation due to insufficient phase margin-especially under load transients or temperature extremes.
What is the maximum input voltage rating for LP3982IMM-2.82/NOPB?
The absolute maximum input voltage for LP3982IMM-2.82/NOPB is 6.5V, but the recommended operating range is 2.5V to 6.0V per electrical specifications. Exceeding 6.0V risks violating safe operating area limits and may trigger thermal shutdown or degrade long-term reliability-even if within absolute maximum ratings.
How does the FAULT pin on LP3982IMM-2.82/NOPB behave during thermal shutdown?
During thermal shutdown, the FAULT pin on LP3982IMM-2.82/NOPB asserts low (≤0.25V at 2mA sink) and remains latched low until junction temperature drops ~10°C below the 160°C trip point. This provides unambiguous system-level fault indication without requiring continuous polling, enabling immediate host MCU intervention or graceful shutdown sequences.
LP3982IMM-2.82/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:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 2.82V
- 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-2.82/NOPB FAQ
1.How can I place an order for LP3982IMM-2.82/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3982IMM-2.82/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 LP3982IMM-2.82/NOPB reliable?
The price and inventory of LP3982IMM-2.82/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3982IMM-2.82/NOPB is usually 5 days.
3.What payment methods are accepted for LP3982IMM-2.82/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3982IMM-2.82/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3982IMM-2.82/NOPB?
LP3982IMM-2.82/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3982IMM-2.82/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 LP3982IMM-2.82/NOPB?
For technical support, including LP3982IMM-2.82/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3982IMM-2.82/NOPB requirements.
6.How does Aetrix verify that LP3982IMM-2.82/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3982IMM-2.82/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 LP3982IMM-2.82/NOPB meets industry standards.
7.What is the process for return or replacement of LP3982IMM-2.82/NOPB?
All LP3982IMM-2.82/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3982IMM-2.82/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 LP3982IMM-2.82/NOPB part is unused and in its original packaging.
Return procedure for LP3982IMM-2.82/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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