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Texas Instruments LM2941T/LB08
- Part No.:
- LM2941T/LB08
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
LM2941T/LB08.pdf
- Description:
- IC REG LINEAR POS ADJ 1A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,145
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Product details
Overview
LM2941T/LB08 from Texas Instruments is a 1-A adjustable low-dropout linear regulator with 0.5 V typical dropout at full load, operating from 6 V to 26 V input and delivering 5 V to 20 V output via external resistor divider. It features reverse-battery protection, TTL/CMOS-compatible ON/OFF control, and thermal shutdown-designed for automotive power rails and industrial control modules requiring stable mid-voltage regulation under wide input transients.
For engineers reviewing the LM2941T/LB08 datasheet, LM2941T/LB08 pinout, LM2941T/LB08 application, or LM2941T/LB08 equivalent, key selection criteria include dropout voltage at 1 A, quiescent current behavior above 3 V VIN–VOUT differential, ON/OFF logic polarity, WSON-8 thermal pad layout requirements, and compatibility with 22 µF/100 mΩ–1 Ω output capacitor ESR range.
Technical Context
The LM2941T/LB08 uses a PNP pass transistor architecture enabling low dropout while maintaining 1 A output capability across −40°C to +125°C. Its internal bandgap reference (1.275 V typ.) sets output voltage via ADJ pin feedback, and an integrated quiescent current reduction circuit lowers ground current to 30 mA when VIN−VOUT ≥5 V.
Protection functions include overvoltage shutdown (triggered at ~30 V), thermal shutdown (155°C junction limit), and short-circuit current limiting (~1.75 A). The ON/OFF pin requires active low assertion (≤0.8 V) to enable regulation and high-level disable (≥2 V), with no internal pull-up/down-necessitating external termination.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1 A continuous; supports industrial loads without external boost stages. |
| Dropout Voltage | 0.5 V typical at 1 A; enables operation with minimal headroom (e.g., 12 V input → 11.5 V output). |
| Input Voltage Range | 6 V to 26 V; survives automotive load dump transients up to 31 V (100 ms). |
| Output Voltage Range | 5 V to 20 V adjustable via R1/R2 divider; reference voltage trimmed to 1.275 V ±3%. |
| Quiescent Current | 30 mA at 1 A load and VIN−VOUT = 5 V; drops significantly outside dropout mode. |
| Thermal Shutdown | Activates at ~155°C junction temperature; protects against sustained overload or poor heatsinking. |
| Reverse Polarity Protection | Withstands −30 V DC input (100 Ω load); prevents damage during battery misconnection. |
Pinout & Package
LM2941T/LB08 is packaged in an 8-lead WSON (NGN) package measuring 4.00 mm × 4.00 mm with exposed thermal pad (DAP) connected to pins 2 and 7 (GND). The DAP must be soldered to a PCB ground plane using ≥6 thermal vias for reliable thermal performance (RθJA = 40.5°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (ON/OFF) | Enable/disable control input | Active-low logic: ≤0.8 V enables output; ≥2 V disables; requires external pull-down if unused. |
| 2, 7 (GND) | Ground reference and thermal pad connection | Pins 2 and 7 connect to exposed DAP; both must tie to system ground for thermal and electrical integrity. |
| 3 (ADJ) | Feedback reference node | Senses voltage divider (R1/R2); bias current <100 nA-use 1 kΩ ≤ R1 ≤ 10 kΩ for accuracy. |
| 4 (IN) | Unregulated input supply | Accepts 6–26 V; requires ≥470 nF ceramic input capacitor placed within 1 cm of pin. |
| 5 (OUT) | Regulated output | Delivers 5–20 V; requires ≥22 µF output capacitor with 100 mΩ–1 Ω ESR for stability. |
| 6, 8 (NC) | No internal connection | Leads 6 and 8 are unconnected die pads; may be left floating or tied to GND per layout best practice. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Output Voltage | 5 V to 20 V set by external resistors; avoids fixed-voltage inventory fragmentation. |
| Reverse Battery Protection | Operates safely down to −30 V input; eliminates need for external series diode in automotive harnesses. |
| Low Quiescent Current in Dropout | 30 mA at 1 A load and 5 V headroom; extends battery runtime in always-on vehicle modules. |
| Mirror Image Insertion Protection | Prevents damage if installed backward on PCB; critical for high-volume automated assembly. |
| TTL/CMOS-Compatible ON/OFF | Direct interface with microcontroller GPIO without level-shifting; simplifies enable sequencing. |
Applications
| Automotive Body Control Module | Industrial PLC I/O Power Rail |
|---|---|
|
Use Scenario: Regulating 12 V battery-derived supply to 12 V or 15 V for microcontroller, CAN transceiver, and sensor interface circuits in door modules or lighting controllers. IC Role / Device Role / Timing Role: Primary LDO providing clean, transient-robust mid-rail power; handles load dump (up to 31 V) and cold-crank (down to 6 V). Use Value: Eliminates need for upstream buck converter; reverse-polarity tolerance avoids fuse replacement after service bay errors. |
Use Scenario: Generating stable 5 V or 12 V from 24 V DC plant bus for isolated digital I/O drivers and analog sensor signal conditioning. IC Role / Device Role / Timing Role: Adjustable LDO supplying power to field-side circuitry; withstands industrial voltage surges and EMI-induced transients. Use Value: 1 A output sustains multiple optocouplers and level shifters; thermal shutdown prevents latch-up during shorted output faults. |
| Telematics GPS/GNSS Receiver | Medical Portable Diagnostic Device |
|
Use Scenario: Providing low-noise 3.3 V (via 1.275 V reference + R1/R2) to GNSS RF front-end and baseband processor in fleet-tracking units. IC Role / Device Role / Timing Role: Low-ripple, low-dropout regulator feeding sensitive RF/analog sections; rejects switching noise from adjacent DC/DC converters. Use Value: 0.003% RMS output noise and 60 dB ripple rejection at 120 Hz preserve GNSS signal integrity and time-to-first-fix. |
Use Scenario: Delivering 5 V to microcontroller, display backlight driver, and USB charging port in handheld ultrasound or glucose meter. IC Role / Device Role / Timing Role: Main system regulator supporting battery-backed operation; maintains regulation during battery voltage sag (down to 6 V). Use Value: 0.5 V dropout enables >90% battery energy utilization; WSON-8 footprint saves space in compact enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2941CT | TO-220-5 package; higher RθJA (32.1°C/W); same electrical specs but larger footprint and no exposed thermal pad. | Preferred for prototyping or low-volume through-hole assembly; unsuitable for space-constrained or thermally demanding layouts. | Select LM2941CT only when manual soldering or heat sink mounting is required; avoid in dense SMT designs. |
| TPS7A4700RGWR | Ultra-low noise (4.7 µVRMS), lower IQ (1 mA), but 500 mA max output and narrower input range (±2.5 V to ±20 V). | Better for precision analog or RF bias rails; insufficient for 1 A digital loads or automotive transients beyond 20 V. | Choose TPS7A4700RGWR for noise-sensitive analog subsystems; not a functional replacement for LM2941T/LB08's 1 A/26 V capability. |
Compared with LM2941CT and TPS7A4700RGWR, LM2941T/LB08 uniquely balances 1 A output, 26 V survival rating, reverse-battery hardening, and WSON-8 thermal efficiency-making it irreplaceable in automotive body electronics where size, ruggedness, and mid-rail adjustability converge.
Availability
LM2941T/LB08 is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC I/O power rails, telematics GPS receivers, and medical portable diagnostic devices requiring stable component supply with guaranteed long-term manufacturability.
Supply support for LM2941T/LB08 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 and embedded processing technologies, with decades of automotive-grade reliability validation and broad power management portfolio coverage.
The LM2941 product line delivers rugged, adjustable LDO regulators optimized for vehicular environments-featuring reverse-battery tolerance, load-dump survival, and thermal robustness for under-hood and body-control applications.
FAQ
What is the minimum input voltage required for LM2941T/LB08 to regulate at 12 V output?
The LM2941T/LB08 requires at least 12.5 V input to sustain 12 V output at 1 A load, based on its 0.5 V typical dropout voltage. At elevated temperatures or maximum load, dropout may reach 1 V, so 13 V input is recommended for margin. Input below 6 V is outside absolute maximum ratings and will disable regulation.
Can LM2941T/LB08 be used without the ON/OFF pin connected?
No-LM2941T/LB08 has no internal pull-up or pull-down on the ON/OFF pin. Leaving it floating risks undefined enable state and potential oscillation. For always-on operation, tie ON/OFF directly to GND. For controlled enable, use a microcontroller GPIO with appropriate drive strength and voltage thresholds (≤0.8 V ON, ≥2 V OFF).
What output capacitor specifications are mandatory for LM2941T/LB08 stability?
LM2941T/LB08 requires a minimum 22 µF output capacitor with ESR between 100 mΩ and 1 Ω, placed within 1 cm of the OUT and GND pins. Tantalum capacitors meet this directly; ceramic capacitors require a series resistor (0.1–1 Ω) to emulate ESR. Using undersized or low-ESR ceramics without compensation causes oscillation and regulation failure.
How does LM2941T/LB08 handle reverse battery connection?
LM2941T/LB08 withstands −30 V DC input with 100 Ω load, preventing damage during accidental reverse battery jump-starts. Internal protection blocks reverse current flow without external components. This feature is intrinsic to the IC design and requires no additional diodes or FETs in the power path.
Is the exposed thermal pad (DAP) on LM2941T/LB08 electrically connected?
Yes-the DAP on LM2941T/LB08 is internally connected to pins 2 and 7 (GND). It must be soldered to a PCB ground plane using at least six thermal vias. Floating or connecting the DAP to any non-ground potential violates the datasheet and risks thermal runaway or electrical malfunction.
LM2941T/LB08 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:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-5
LM2941T/LB08 FAQ
1.How can I place an order for LM2941T/LB08 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2941T/LB08 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 LM2941T/LB08 reliable?
The price and inventory of LM2941T/LB08 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2941T/LB08 is usually 5 days.
3.What payment methods are accepted for LM2941T/LB08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2941T/LB08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2941T/LB08?
LM2941T/LB08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2941T/LB08 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 LM2941T/LB08?
For technical support, including LM2941T/LB08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2941T/LB08 requirements.
6.How does Aetrix verify that LM2941T/LB08 is sourced from the original manufacturer or authorized distributors?
All LM2941T/LB08 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 LM2941T/LB08 meets industry standards.
7.What is the process for return or replacement of LM2941T/LB08?
All LM2941T/LB08 units undergo pre-shipment inspection (PSI). If there is an issue with LM2941T/LB08, 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 LM2941T/LB08 part is unused and in its original packaging.
Return procedure for LM2941T/LB08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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