National Semiconductor LM2940CS-15
| Quantity | Unit Price | Total Price |
|---|---|---|
| 1 | $6.48 | $6.48 |
| 15+ | $1.49 | $22.35 |
| 25+ | $1.46 | $36.50 |
| 50+ | $1.38 | $69.00 |
| 100+ | $1.22 | $122.00 |
| N+ | $0.24 | Price Inquiry |
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| Product attributes | Property Value |
| Manufacturer | National Semiconductor |
| Product Series | |
| Packaging | Bulk | |
| Output Configuration | Positive |
| Output Type | Fixed |
| Number of Regulators | 1 |
| Voltage - Input (Max) | 26V |
| Voltage - Output (Min/Fixed) | 15V |
| Voltage - Output (Max) | - |
| Voltage Dropout (Max) | 0.8V @ 1A |
| Current - Output | 1A |
| Current - Quiescent (Iq) | 10 mA |
| Current - Supply (Max) | 15 mA |
| PSRR | 64dB (120Hz) |
| Control Features | - |
| Protection Features | Over Current, Over Temperature, Reverse Polarity, Short Circuit |
| Operating Temperature | 0°C ~ 125°C |
| Grade | - |
| Qualification | - |
| Mounting Type | Surface Mount |
| Package / Case | TO-263-4, D2PAK (3 Leads + Tab), TO-263AA |
| Supplier Device Package | DDPAK/TO-263-3 |
| ROHS |  |
The LM2940CS-15 is a fixed 15V low dropout linear regulator capable of delivering 1A of output current. With a typical dropout voltage of just 0.8V at full load, it efficiently regulates from input voltages as low as 15.8V. The device features a low quiescent current of 10 mA and excellent ripple rejection of 64dB at 120Hz, making it ideal for noise-sensitive applications. Housed in a DDPAK/TO-263-3 package, it offers robust thermal performance for demanding environments.
- High Current Capacity: Delivers up to 1A, suitable for powering multiple loads or high-current modules.
- Low Dropout Voltage: 0.8V typical at 1A enables operation from marginally higher input supplies, reducing power loss.
- Excellent PSRR: 64dB at 120Hz filters AC ripple, ensuring clean output for sensitive analog circuits.
- Low Quiescent Current: 10 mA typical minimizes standby power consumption in battery-operated systems.
Automotive Power Supply
Regulate vehicle battery voltage (12V nominal) to a stable 15V for sensors or actuators. The 1A current capability and 64dB PSRR at 120Hz ensure clean power despite alternator ripple.
Industrial Control Systems
Provide a regulated 15V rail for analog signal conditioning circuits. The low dropout of 0.8V allows operation from a 16V unregulated supply with minimal power dissipation.
Telecommunication Equipment
Power RF transceiver modules requiring a stable 15V supply. The high PSRR reduces noise coupling from switching power supplies, improving signal integrity.
Battery-Powered Devices
Use with a 16.8V Li-ion battery pack to maintain a constant 15V output as the battery discharges. The low quiescent current extends battery life in standby mode.
Test and Measurement Instruments
Generate a precise 15V reference for calibration equipment. The 1A output can drive multiple loads while maintaining regulation within tight tolerances.
Audio Amplifier Front-Ends
Supply a clean 15V rail for op-amp stages. The 64dB PSRR at 120Hz effectively filters mains hum, preserving audio fidelity.
- Q: What is the output voltage of the LM2940CS-15?
- A: The LM2940CS-15 provides a fixed output voltage of 15V.
- Q: What is the maximum output current?
- A: It can deliver up to 1A of continuous output current.
- Q: What is the input voltage range?
- A: The input voltage must be at least 15V plus the dropout voltage (0.8V typical at 1A), so a minimum of approximately 15.8V is required.
- Q: What is the dropout voltage?
- A: The dropout voltage is typically 0.8V at a 1A load.
- Q: What is the quiescent current?
- A: The quiescent current is typically 10 mA.
- Q: What package is available?
- A: It is available in the DDPAK/TO-263-3 surface-mount package.
LM2940CS-15.pdf
- Q: What is the output voltage of the LM2940CS-15?
- A: The LM2940CS-15 provides a fixed output voltage of 15V.
- Q: What is the maximum output current?
- A: It can deliver up to 1A of continuous output current.
- Q: What is the input voltage range?
- A: The input voltage must be at least 15V plus the dropout voltage (0.8V typical at 1A), so a minimum of approximately 15.8V is required.
- Q: What is the dropout voltage?
- A: The dropout voltage is typically 0.8V at a 1A load.
- Q: What is the quiescent current?
- A: The quiescent current is typically 10 mA.
- Q: What package is available?
- A: It is available in the DDPAK/TO-263-3 surface-mount package.
