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Texas Instruments LP2954IT/NOPB
- Part No.:
- LP2954IT/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-3
- Datasheet:
-
LP2954IT/NOPB.pdf
- Description:
- IC REG LINEAR 5V 250MA TO220-3
- Quantity:
- Payment:
- Shipping:
Inventory:248
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Product details
Overview
LP2954IT/NOPB from Texas Instruments is a fixed 5-V micropower low-dropout (LDO) linear regulator in TO-220 package, delivering up to 250 mA output current with 90 µA typical quiescent current at 1-mA load, 60 mV typical dropout at light load, and ±1.2% output accuracy over −40°C to +125°C - used in battery-powered instrumentation requiring stable low-power voltage regulation.
For engineers reviewing the LP2954IT/NOPB datasheet, LP2954IT/NOPB pinout, LP2954IT/NOPB application, or LP2954IT/NOPB equivalent, key selection criteria include guaranteed 250-mA output, reverse-battery protection on IN pin, tight line/load regulation (0.04% typical), thermal shutdown, and compatibility with LM2940/LM340 for drop-in replacement in legacy 5-V LDO designs.
Technical Context
The LP2954IT/NOPB implements a PNP pass transistor architecture enabling ultra-low dropout and minimal quiescent current increase under dropout conditions (120 µA typical). Its internal 1.23-V bandgap reference feeds an error amplifier that controls the pass element to maintain regulated 5-V output across input voltages from 2.3 V to 30 V.
Unlike adjustable variants, the LP2954IT/NOPB omits ERROR, FEEDBACK, SENSE, SHUTDOWN, and 5V TAP pins - it uses only IN, GND, and OUT terminals. It provides reverse-battery protection on the IN pin and integrates current limiting and thermal shutdown without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5 V ±1.2% over −40°C to +125°C - ensures stable logic supply for microcontrollers and sensors without trimming. |
| Max Output Current | 250 mA - supports moderate-power analog front-ends and mixed-signal subsystems without external boost. |
| Quiescent Current | 90 µA typical at 1-mA load - extends battery life in always-on monitoring devices. |
| Dropout Voltage | 60 mV typical at 1 mA; 470 mV at 250 mA - enables operation from single-cell Li-ion (3.0 V min) or 2xAA alkaline (2.4 V min) inputs. |
| Line Regulation | 0.03% typical (VIN = 6 V to 30 V) - minimizes output variation during input ripple or battery discharge. |
| Load Regulation | 0.04% typical (IL = 1 mA to 250 mA) - maintains precision in varying load conditions like sensor wake/sleep cycles. |
| Thermal Shutdown | Integrated - prevents damage during sustained overload or poor heatsinking; auto-recovery on cooldown. |
Pinout & Package
LP2954IT/NOPB is housed in a 3-pin TO-220 package (NDE) with body size 14.986 mm × 10.16 mm and vertical mounting orientation. The tab is electrically connected to GND and serves as primary heat path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Unregulated input | Accepts 2.3 V to 30 V; includes reverse-battery protection - survives −20 V applied to IN with GND grounded. |
| GND | Ground reference | Common return for input, output, and internal circuitry; tab connection enables heatsinking. |
| OUT | Regulated output | Delivers fixed 5 V; requires ≥2.2 µF output capacitor to ground for stability; no external feedback needed. |
Key Features
| Feature | Design Value |
|---|---|
| Reverse-battery protection | IN pin withstands −20 V with GND grounded - eliminates need for external series diode in automotive/battery systems. |
| Tight output accuracy | ±1.2% over full temperature range - suitable for ADC references and precision analog supplies without calibration. |
| Low dropout at full load | 470 mV at 250 mA - enables >84% efficiency at VIN = 6 V, reducing thermal stress vs. standard linear regulators. |
| Ultra-low quiescent current | 90 µA typical at 1 mA - reduces standby power by >90% vs. legacy 5-V regulators like LM7805 (5–8 mA). |
| Integrated protection | Current limit (380–500 mA) and thermal shutdown - prevents latch-up or destruction during fault conditions. |
Applications
| Portable Medical Sensors | Industrial Data Loggers |
|---|---|
Use Scenario: Continuous ECG/SpO₂ monitoring powered by two AA alkaline cells (2.4–3.2 V range) with 24-hour runtime requirement. IC Role / Device Role / Timing Role: Primary 5-V LDO supplying microcontroller, analog front-end, and Bluetooth LE radio. Use Value: 90 µA quiescent current and 470 mV dropout at 250 mA enable operation down to 2.4 V input while maintaining 5 V ±1.2% - extending usable battery capacity by 35% vs. LM2940. | Use Scenario: Remote environmental sensor node deployed in unheated outdoor enclosures (−40°C to +85°C ambient). IC Role / Device Role / Timing Role: Stable 5-V rail for 16-bit ADC, SD card interface, and low-power MCU in wide-temperature industrial design. Use Value: ±1.2% output accuracy over −40°C to +125°C and 0.04% load regulation ensure consistent ADC reference voltage across temperature and load swings - eliminating system-level recalibration. |
| Legacy Automotive ECUs | Test & Measurement Equipment |
Use Scenario: Retrofit power supply upgrade in 12-V automotive control unit replacing obsolete LM340T-5.0. IC Role / Device Role / Timing Role: Pin-compatible 5-V LDO with enhanced reverse-polarity protection and lower dropout. Use Value: Direct TO-220 footprint replacement with reverse-battery protection (−20 V IN rating) and 60 mV dropout at light load - improves cold-cranking margin and eliminates external protection diodes. | Use Scenario: Benchtop multimeter requiring ultra-stable 5-V reference for precision voltage measurement circuits. IC Role / Device Role / Timing Role: Low-noise, low-drift 5-V source for DAC reference and analog signal conditioning stages. Use Value: 20 ppm/°C output temperature coefficient and 0.03% line regulation minimize drift due to ambient changes or input ripple - achieving <0.01% total error over operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 5-V LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2940CT-5.0/NOPB | Same TO-220 package; higher quiescent current (10 mA typical); no reverse-battery protection; 500 mV dropout at 250 mA. | Lacks reverse-polarity survivability; less efficient in battery systems; wider output tolerance (±5%). | Choose when cost is primary constraint and reverse-battery risk is mitigated externally. |
| TLV70033DDCR | SOT-23-5 package; 3.3-V fixed output; 30 µA IQ; 170 mV dropout at 200 mA - not pin-compatible or voltage-matched. | Requires PCB redesign; unsuitable for 5-V systems; optimized for ultra-low-power sub-1-V logic rails. | Consider only for new 3.3-V designs prioritizing size and ultra-low IQ over 5-V compatibility. |
Compared with LM2940CT-5.0/NOPB, LP2954IT/NOPB delivers 110× lower quiescent current and reverse-battery protection, making it superior for battery longevity and automotive robustness; versus TLV70033DDCR, it provides the required 5-V output and TO-220 thermal capability but trades off miniaturization for legacy compatibility and higher current delivery.
Availability
LP2954IT/NOPB is available at Aetrix Electronics and suitable for portable medical sensors, industrial data loggers, and legacy automotive ECUs requiring stable component supply with long-term manufacturability and extended temperature support.
Supply support for LP2954IT/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 is a global semiconductor leader specializing in analog, embedded processing, and power management ICs, with decades of expertise in high-reliability linear regulators and automotive-grade components.
The LP2954 product line was designed for battery-powered and industrial applications demanding micropower operation, wide-input-voltage tolerance, and robust protection - targeting systems where efficiency, thermal safety, and long-term supply stability are critical.
FAQ
What is the maximum input voltage rating for LP2954IT/NOPB?
The LP2954IT/NOPB has an absolute maximum input voltage rating of 30 V, with recommended operating range from 2.3 V to 30 V. Exceeding 30 V risks permanent damage. The device also supports reverse-battery protection down to −20 V on the IN pin when GND is grounded - a key differentiator from standard LDOs. This makes LP2954IT/NOPB suitable for automotive and battery-backed systems where polarity reversal or load-dump transients may occur.
Does LP2954IT/NOPB require an external output capacitor, and what value is recommended?
Yes, LP2954IT/NOPB requires a minimum 2.2 µF output capacitor connected between OUT and GND for stability. Aluminum electrolytic or tantalum capacitors with ≤5 Ω ESR are recommended. For loads below 10 mA, capacitance may be reduced to 0.68 µF; for loads below 1 mA, 0.22 µF suffices. The capacitor must be placed close to the device to minimize parasitic inductance. Failure to use adequate capacitance may cause oscillation or regulation loss. LP2954IT/NOPB does not support ceramic capacitors below 10 µF without additional damping due to ESR requirements.
Is LP2954IT/NOPB pin-compatible with LM2940CT-5.0?
Yes, LP2954IT/NOPB is pin-compatible with LM2940CT-5.0 in the TO-220 package: both use IN–GND–OUT pinout order and share identical mechanical footprint and tab-to-GND connection. However, LP2954IT/NOPB adds reverse-battery protection and achieves lower dropout (470 mV vs. 500 mV at 250 mA) and far lower quiescent current (90 µA vs. 10 mA). No PCB changes are required for direct replacement, but system-level validation of transient response and thermal performance is advised due to differences in internal architecture.
What is the thermal performance of LP2954IT/NOPB in TO-220 package?
LP2954IT/NOPB in TO-220 (NDE) package has a junction-to-ambient thermal resistance (RθJA) of 80.3°C/W on JEDEC High-K test board, and junction-to-case (bottom) resistance of 0.9°C/W. With 250 mA load and 6 V input, power dissipation is ~250 mW - resulting in ~20°C junction rise above ambient. For continuous 250 mA operation at 85°C ambient, a small heatsink or copper pour is recommended to keep junction temperature below 125°C. Derating is required above 85°C ambient per thermal regulation specs.
Does LP2954IT/NOPB include current limiting and thermal shutdown?
Yes, LP2954IT/NOPB integrates both current limiting and thermal shutdown. Current limit triggers at 380–500 mA (typical) under short-circuit or overload conditions, holding output current constant while reducing output voltage. Thermal shutdown activates when junction temperature exceeds ~160°C, disabling the pass transistor until temperature falls by ~20°C. Both protections are fully internal - no external components needed. Recovery is automatic and non-latching. These features ensure robust operation in fault-prone environments such as industrial sensors or automotive modules.
LP2954IT/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.8V @ 250mA
- Current - Output:
- 250mA
- Current - Quiescent (Iq):
- 150 µA
- Current - Supply (Max):
- 33 mA
- PSRR:
- -
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Reverse Polarity
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-3
LP2954IT/NOPB FAQ
1.How can I place an order for LP2954IT/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2954IT/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 LP2954IT/NOPB reliable?
The price and inventory of LP2954IT/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP2954IT/NOPB is usually 5 days.
3.What payment methods are accepted for LP2954IT/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2954IT/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2954IT/NOPB?
LP2954IT/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2954IT/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 LP2954IT/NOPB?
For technical support, including LP2954IT/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2954IT/NOPB requirements.
6.How does Aetrix verify that LP2954IT/NOPB is sourced from the original manufacturer or authorized distributors?
All LP2954IT/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 LP2954IT/NOPB meets industry standards.
7.What is the process for return or replacement of LP2954IT/NOPB?
All LP2954IT/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP2954IT/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 LP2954IT/NOPB part is unused and in its original packaging.
Return procedure for LP2954IT/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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