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Texas Instruments LM2941CT/LB03
- Part No.:
- LM2941CT/LB03
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
LM2941CT/LB03.pdf
- Description:
- IC REG LINEAR POS ADJ 1A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,076
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Product details
Overview
LM2941CT/LB03 from Texas Instruments is a 1-A adjustable low-dropout linear regulator with 0.5 V typical dropout at 1 A, 5 V to 20 V output range set by external resistors R1/R2, and reverse-battery protection-designed for automotive power rails where input may range from 6 V to 26 V.
For engineers reviewing the LM2941CT/LB03 datasheet, LM2941CT/LB03 pinout, LM2941CT/LB03 application, or LM2941CT/LB03 equivalent, key selection considerations include dropout voltage under load, ON/OFF control threshold compatibility, thermal performance in TO-220-5 package, and stability requirements for 22 µF output capacitor with 100 mΩ–1 Ω ESR.
Technical Context
The LM2941CT/LB03 implements a PNP-based LDO architecture with internal bandgap reference (1.275 V typ), quiescent current reduction circuit that lowers ground current to 30 mA at VIN−VOUT = 5 V/1 A, and overvoltage shutdown triggered above ~30 V. It features TTL/CMOS-compatible active-low ON/OFF control with 0.8 V ON and 2 V OFF thresholds.
Protection functions include internal short-circuit current limiting (1.6–1.9 A), thermal shutdown at ~155°C, reverse-battery protection down to −30 V DC, and mirror-image insertion protection. The ADJ pin enables precise output setting via resistor divider while maintaining reference accuracy of ±3% over temperature and load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1 A continuous; supports industrial loads without external pass transistor |
| Dropout Voltage | 0.5 V typical at 1 A; enables regulation from 6 V input to 5.5 V output |
| Input Voltage Range | 6 V to 26 V operating; survives up to 45 V transient (≤100 ms) |
| Output Voltage Range | 5 V to 20 V adjustable; set externally with R1/R2 per VOUT = 1.275 × (1 + R2/R1) |
| Quiescent Current | 30 mA at 1 A load and 5 V input–output differential; drops further at higher differentials |
| Reference Voltage | 1.275 V ±3%; trimmed for accuracy across temperature and load |
| Thermal Shutdown | Activates at ~155°C junction; protects against sustained overload or poor heatsinking |
| Reverse Polarity Protection | Withstands −30 V DC input; prevents damage during battery misconnection in vehicle systems |
Pinout & Package
LM2941CT/LB03 uses the TO-220-5 (KC) plastic package with 14.986 mm × 10.16 mm body size and integrated heat sink tab connected to Pin 3 (GND). Thermal resistance is RθJA = 32.1°C/W with standard PCB layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 4) | Input supply connection | Accepts 6–26 V; requires ≥470 nF ceramic bypass capacitor close to pin |
| OUT (Pin 5) | Regulated output | Delivers 5–20 V; requires ≥22 µF output capacitor with 100 mΩ–1 Ω ESR for stability |
| GND (Pin 3) | Power ground reference | Common return for IN, OUT, ADJ, and ON/OFF; ties to heat sink tab |
| ON/OFF (Pin 2) | Enable/disable control | Active-low logic input; <0.8 V enables, >2 V disables; no internal pull-up/down |
| ADJ (Pin 1) | Output voltage feedback | Connects to R1–R2 divider midpoint; bias current <100 µA enables high-precision setting |
| NC (Pins not assigned) | No internal connection | Not bonded; leave floating or tie to GND per layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Output | 5–20 V range set by two external resistors-enables single BOM for multiple rail voltages |
| Low Dropout | 0.5 V typical at full 1 A load-minimizes power loss and heat generation in 12 V automotive systems |
| Reverse Battery Protection | Operates safely with −30 V applied-eliminates need for external series diode in vehicle electronics |
| ON/OFF Control | TTL/CMOS-compatible active-low enable-supports microcontroller-driven power sequencing |
| Quiescent Current Reduction | Ground current drops to 30 mA at 5 V VIN−VOUT differential-extends battery life in always-on modules |
| Integrated Protections | Short-circuit limit, thermal shutdown, and overvoltage shutdown-reduces system-level fault-handling complexity |
Applications
| Automotive Body Control Module | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Powering microcontrollers, CAN transceivers, and door-lock actuators in 12 V vehicle electrical systems subject to load dump and reverse-battery events. IC Role / Device Role / Timing Role: Primary 5 V or 12 V LDO supplying regulated rail to safety-critical subsystems. Use Value: Reverse-battery protection eliminates external diode; 1 A output sustains peak actuator currents without derating. | Use Scenario: Providing stable 15 V bias to precision op-amps and ADC drivers in factory-floor instrumentation exposed to wide ambient temperatures. IC Role / Device Role / Timing Role: Adjustable voltage source delivering clean, low-noise analog supply independent of main 24 V bus fluctuations. Use Value: 0.003% RMS output noise and 0.02%/V ripple rejection preserve signal integrity in 16-bit measurement chains. |
| Telematics GPS Receiver Power | Commercial Vehicle Telematics Gateway |
Use Scenario: Regulating 5 V supply for GPS/GNSS receivers in fleet-tracking units mounted near engine compartments with high thermal stress. IC Role / Device Role / Timing Role: Thermally robust LDO maintaining regulation across −40°C to +125°C ambient with minimal heatsink area. Use Value: RθJA = 32.1°C/W and thermal shutdown at 155°C allow reliable operation without oversized heatsinks. | Use Scenario: Generating 12 V auxiliary rail for LTE modems and SD card interfaces in multi-protocol telematics gateways powered from truck 24 V battery. IC Role / Device Role / Timing Role: Programmable LDO enabling flexible rail assignment across product variants using same PCB footprint. Use Value: Adjustable output (5–20 V) and ON/OFF control support dynamic power management and firmware-controlled sleep modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2941T | Same electrical specs but rated for −40°C to +125°C operating range vs. LM2941CT/LB03's 0°C to +125°C | Suitable for under-hood automotive use; LM2941CT/LB03 limited to cabin or chassis-mounted modules | Select LM2941T when extended temperature qualification is required; otherwise LM2941CT/LB03 offers cost advantage for commercial-temp designs |
| TPS7A4700RGWR | Lower noise (4.7 µVrms), lower dropout (300 mV), but only 100 mA output and fixed 3.3 V/5 V options-not adjustable to 5–20 V range | Better for ultra-low-noise analog rails; cannot replace LM2941CT/LB03 in high-current or wide-output-voltage applications | Use TPS7A4700RGWR only for precision analog sub-rails; retain LM2941CT/LB03 for main digital/analog hybrid supplies requiring >500 mA and programmability |
Compared with LM2941T, LM2941CT/LB03 trades extended temperature range for lower cost and same core functionality; compared with TPS7A4700RGWR, it provides 10× higher output current and full adjustability at the expense of higher noise and dropout-making it the appropriate choice for cost-sensitive, high-current, wide-range automotive and industrial LDO needs.
Availability
LM2941CT/LB03 is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor signal conditioning, telematics GPS receivers, and commercial vehicle telematics gateways requiring stable component supply across production lifecycles.
Supply support for LM2941CT/LB03 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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management ICs for industrial, automotive, and communications markets.
The LM2941 product line delivers rugged, automotive-qualified LDO regulators with reverse-battery protection and wide-input capability-designed specifically for harsh- environment vehicular power distribution and industrial control applications.
FAQ
What is the maximum input voltage the LM2941CT/LB03 can withstand without damage?
The LM2941CT/LB03 has an absolute maximum input survival voltage of 45 V for ≤100 ms transients, such as load dump events. Its recommended maximum continuous operating input voltage is 26 V. Exceeding 26 V continuously degrades reliability and is not guaranteed per specification. The device includes overvoltage shutdown that disables output above ~30 V to protect downstream circuitry.
How do I set the output voltage of the LM2941CT/LB03 to 12 V?
To set LM2941CT/LB03 output to 12 V, use the formula VOUT = 1.275 V × (1 + R2/R1). With R1 = 1 kΩ (recommended for minimal bias error), solve R2 = 1 kΩ × (12/1.275 − 1) ≈ 8.4 kΩ. Use a 1% metal-film resistor for R2 and ensure both R1 and R2 have matched temperature coefficients to maintain accuracy across temperature.
Does the LM2941CT/LB03 require an output capacitor, and what are its specifications?
Yes, the LM2941CT/LB03 requires a minimum 22 µF output capacitor with ESR between 100 mΩ and 1 Ω for loop stability. Tantalum capacitors meet this directly; ceramic capacitors require a series resistor (0.1–1 Ω) to emulate ESR. The capacitor must be placed within 1 cm of the OUT and GND pins, rated for the full operating temperature range, and located on the same PCB side as the regulator.
What is the purpose of the ON/OFF pin on the LM2941CT/LB03, and how should it be used?
ON/OFF is an active-low enable pin (Pin 2) that controls regulator output state. Drive it below 0.8 V to enable, above 2 V to disable. It draws <100 µA and has no internal pull-up/down, so external termination is mandatory-connect to GND for always-on operation or to a microcontroller GPIO for controlled power sequencing. Leaving it floating causes undefined behavior.
Can the LM2941CT/LB03 be used in reverse-battery scenarios common in automotive service environments?
Yes, the LM2941CT/LB03 includes integrated reverse-battery protection and withstands −30 V DC input with ROUT = 100 Ω. This allows safe operation during accidental battery terminal reversal in vehicle service or jump-start conditions without requiring external protection diodes-reducing BOM count and forward-voltage drop in the power path.
LM2941CT/LB03 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-220-5 Formed Leads
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 26V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- 20V
- Voltage Dropout (Max):
- 1V @ 1A
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 10 mA
- Current - Supply (Max):
- 15 mA
- PSRR:
- -
- Control Features:
- Enable
- Protection Features:
- Over Temperature, Reverse Polarity, Short Circuit
- Operating Temperature:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-5
LM2941CT/LB03 FAQ
1.How can I place an order for LM2941CT/LB03 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2941CT/LB03 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 LM2941CT/LB03 reliable?
The price and inventory of LM2941CT/LB03 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2941CT/LB03 is usually 5 days.
3.What payment methods are accepted for LM2941CT/LB03?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2941CT/LB03 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2941CT/LB03?
LM2941CT/LB03 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2941CT/LB03 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 LM2941CT/LB03?
For technical support, including LM2941CT/LB03 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2941CT/LB03 requirements.
6.How does Aetrix verify that LM2941CT/LB03 is sourced from the original manufacturer or authorized distributors?
All LM2941CT/LB03 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 LM2941CT/LB03 meets industry standards.
7.What is the process for return or replacement of LM2941CT/LB03?
All LM2941CT/LB03 units undergo pre-shipment inspection (PSI). If there is an issue with LM2941CT/LB03, 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 LM2941CT/LB03 part is unused and in its original packaging.
Return procedure for LM2941CT/LB03:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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