Overview
The LM2940S-12/NOPB is a positive voltage regulator produced by Texas Instruments. This regulator is designed to source up to 1 A of output current with a low dropout voltage of typically 0.5 V and a maximum of 1 V over the entire temperature range. It is particularly suited for vehicular and industrial applications due to its robust protection features, including reverse battery protection, internal short circuit current limit, and thermal overload protection. The LM2940S-12/NOPB also includes a quiescent current reduction circuit, which minimizes ground current when the input-output voltage differential exceeds 3 V, making it efficient in various operating conditions.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | 6 to 26 | V |
| Dropout Voltage | Typically 0.5 V, Max 1 V | V |
| Output Current | In Excess of 1 A | A |
| Output Voltage | 12 V (for LM2940S-12) | V |
| Operating Temperature Range | -40 to 125 | °C |
| Quiescent Current | 30 mA (at VIN - VOUT = 5 V, IOUT = 1 A) | mA |
| Package Type | TO-263 (KTT) | |
| Maximum Junction Temperature | 150 | °C |
Key Features
- Low Dropout Voltage: Typically 0.5 V at 1 A output current.
- High Output Current Capability: In excess of 1 A.
- Output Voltage Trimming: Output voltage is trimmed before assembly.
- Reverse Battery Protection: Protected against reverse battery installations or 2-battery jumps.
- Internal Short Circuit Current Limit: Protects against high-load current faults or shorting events.
- Mirror Image Insertion Protection: Cannot be harmed by temporary mirror-image insertion.
- Thermal Overload Protection: Automatically shuts down to protect internal circuits and the load during thermal overload).
- Quiescent Current Reduction: Reduces ground current when the input-output voltage differential exceeds approximately 3 V).
Applications
- Vehicular Applications: Designed to withstand the harsh conditions of automotive environments, including reverse battery installations and load dump transients).
- Post Regulator for Switching Supplies: Can be used to regulate the output of switching power supplies to provide a stable voltage).
- Logic Power Supplies: Suitable for powering logic circuits that require a stable and regulated voltage).
- Industrial Instrumentation: Used in various industrial applications where reliable and stable voltage regulation is necessary).
Q & A
- What is the input voltage range of the LM2940S-12/NOPB?
The input voltage range is from 6 V to 26 V).
- What is the typical dropout voltage of the LM2940S-12/NOPB?
The typical dropout voltage is 0.5 V at 1 A output current).
- What is the maximum output current of the LM2940S-12/NOPB?
The maximum output current is in excess of 1 A).
- Does the LM2940S-12/NOPB have reverse battery protection?
Yes, it is protected against reverse battery installations or 2-battery jumps).
- What is the operating temperature range of the LM2940S-12/NOPB?
The operating temperature range is from -40°C to 125°C).
- What type of package does the LM2940S-12/NOPB come in?
The LM2940S-12/NOPB comes in a TO-263 (KTT) package).
- Does the LM2940S-12/NOPB have thermal overload protection?
Yes, it automatically shuts down to protect internal circuits and the load during thermal overload).
- What is the quiescent current of the LM2940S-12/NOPB at typical operating conditions?
The quiescent current is 30 mA at VIN - VOUT = 5 V and IOUT = 1 A).
- Can the LM2940S-12/NOPB be used in industrial applications?
Yes, it is suitable for various industrial applications where reliable and stable voltage regulation is necessary).
- Is the LM2940S-12/NOPB protected against short circuit conditions?
Yes, it has an internal short circuit current limit to protect against high-load current faults or shorting events).
