Overview
The L78S09CV is a 2 A positive voltage regulator IC produced by STMicroelectronics. It is part of the L78S series, which is available in TO-220 packages and offers several fixed output voltages. This specific model provides a regulated output voltage of 9 V, making it suitable for a wide range of applications that require stable and reliable voltage regulation. The L78S09CV is designed to provide local on-card regulation, eliminating the distribution problems associated with single point regulation. It features internal current limiting, thermal shut-down, and safe area protection, ensuring it is essentially indestructible if adequate heat sinking is provided.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Output Voltage | 8.65 | 9 | 9.35 | V |
| Output Voltage (IO = 1 A, VI = 11 V) | 8.6 | 9 | 9.4 | V |
| Line Regulation (VI = 11 to 25 V) | 130 | - | 130 | mV |
| Load Regulation (IO = 20 mA to 1.5 A) | 170 | - | 170 | mV |
| Quiescent Current | 8 | - | 8 | mA |
| Output Noise Voltage (B = 10 Hz to 100 kHz) | 60 | - | 60 | µV |
| Supply Voltage Rejection (f = 120 Hz) | 47 | - | 47 | dB |
| Operating Input Voltage (IO ≤ 1 A) | 12 | - | 12 | V |
| Output Resistance (f = 1 kHz) | 17 | - | 17 | mΩ |
| Short Circuit Current (VI = 27 V) | 500 | - | 500 | mA |
| Short Circuit Peak Current | 3 | - | 3 | A |
Key Features
- Output current up to 2 A
- Fixed output voltage of 9 V
- Thermal protection and thermal shut-down
- Short circuit protection and safe area protection
- Internal current limiting
- Low quiescent current of 8 mA
- Good line and load regulation
- Low output noise voltage
- High supply voltage rejection ratio
Applications
The L78S09CV is versatile and can be used in a variety of applications, including:
- Local on-card regulation in electronic devices
- Power supplies for industrial and consumer electronics
- Automotive systems requiring stable voltage regulation
- Medical devices where reliable voltage is crucial
- Telecommunication equipment and networking devices
Q & A
- What is the output voltage of the L78S09CV?
The output voltage of the L78S09CV is 9 V. - What is the maximum output current of the L78S09CV?
The maximum output current is up to 2 A. - What type of protection does the L78S09CV have?
The L78S09CV features thermal protection, short circuit protection, and safe area protection. - What is the quiescent current of the L78S09CV?
The quiescent current is 8 mA. - What is the operating input voltage range for the L78S09CV?
The operating input voltage is up to 12 V for IO ≤ 1 A. - Does the L78S09CV have noise reduction capabilities?
Yes, it has a low output noise voltage of 60 µV (B = 10 Hz to 100 kHz). - Can the L78S09CV be used in automotive systems?
Yes, it can be used in automotive systems requiring stable voltage regulation. - What package type is the L78S09CV available in?
The L78S09CV is available in a TO-220 package. - How does the L78S09CV handle short circuits?
The L78S09CV has short circuit protection with a short circuit current of 500 mA and a short circuit peak current of 3 A. - Is the L78S09CV suitable for medical devices?
Yes, it is suitable for medical devices where reliable voltage regulation is crucial.
