Overview
The L7809CF is a three-terminal positive voltage regulator IC produced by STMicroelectronics. It is part of the L78 series, which is known for its reliability and versatility in various electronic applications. This regulator is available in several package types, including TO-220, TO-220FP, D²PAK, and DPAK, making it suitable for a wide range of uses. The L7809CF provides a fixed output voltage of 9V and can handle currents up to 1.5A, making it an ideal choice for local on-card regulation, thereby eliminating distribution problems associated with long power supply lines.
Key Specifications
| Parameter | Test Conditions | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|
| Output Voltage (VO) | TJ = 25°C | 8.64 | 9 | 9.36 | V |
| Output Voltage (VO) | IO = 5 mA to 1 A, VI = 11.5 to 22 V | 8.55 | 9 | 9.45 | V |
| Dropout Voltage (Vd) | IO = 1 A, TJ = 25°C | 2 | 2.5 | V | |
| Output Resistance (RO) | f = 1 kHz | 16 | 19 | mΩ | |
| Short Circuit Current (Isc) | VI = 35 V, TJ = 25°C | 0.45 | 1.2 | A | |
| Short Circuit Peak Current (Iscp) | TJ = 25°C | 1.3 | 2.2 | A | |
| Output Voltage Drift (∆VO/∆T) | IO = 5 mA | -1 | -0.8 | mV/°C | |
| Output Noise Voltage (eN) | B = 10 Hz to 100 kHz, TJ = 25°C | 40 | 75 | µV/VO | |
| Supply Voltage Rejection (SVR) | VI = 9 to 19 V, f = 120 Hz | 59 | 65 | dB | |
| Operating Temperature Range | 0 | 125 | °C |
Key Features
- Fixed Output Voltage: The L7809CF provides a stable fixed output voltage of 9V, making it suitable for applications requiring a precise voltage supply.
- High Current Capability: It can handle currents up to 1.5A, which is sufficient for many power-intensive applications.
- Low Dropout Voltage: The dropout voltage is typically 2V at 1A, ensuring efficient voltage regulation even when the input voltage is close to the output voltage.
- Low Output Noise: The output noise voltage is as low as 40 µV/VO, which is crucial for applications requiring low noise levels.
- High Supply Voltage Rejection: The regulator has a high supply voltage rejection ratio, typically 59 dB, which helps in maintaining a stable output voltage despite input voltage fluctuations.
- Thermal Stability: The regulator operates over a temperature range of 0°C to 125°C, ensuring reliability in various environmental conditions.
- Multiple Package Options: Available in TO-220, TO-220FP, D²PAK, and DPAK packages, making it versatile for different design requirements.
Applications
- Local On-Card Regulation: The L7809CF is ideal for providing local voltage regulation on PCBs, reducing the need for long power supply lines and associated distribution problems.
- Industrial Control Systems: Suitable for use in industrial control systems where stable and reliable power supply is critical.
- Consumer Electronics: Used in various consumer electronics such as audio equipment, medical devices, and other appliances requiring stable DC power.
- Automotive Systems: Can be used in automotive systems where robust and reliable power regulation is necessary.
- Telecommunication Equipment: Applicable in telecommunication equipment where stable power supply is essential for reliable operation.
Q & A
- What is the fixed output voltage of the L7809CF?
The fixed output voltage of the L7809CF is 9V.
- What is the maximum current that the L7809CF can handle?
The L7809CF can handle currents up to 1.5A.
- What is the typical dropout voltage of the L7809CF?
The typical dropout voltage of the L7809CF is 2V at 1A.
- What is the operating temperature range of the L7809CF?
The operating temperature range of the L7809CF is from 0°C to 125°C.
- What are the available package types for the L7809CF?
The L7809CF is available in TO-220, TO-220FP, D²PAK, and DPAK packages.
- What is the supply voltage rejection ratio of the L7809CF?
The supply voltage rejection ratio of the L7809CF is typically 59 dB.
- What is the output noise voltage of the L7809CF?
The output noise voltage of the L7809CF is as low as 40 µV/VO.
- Is the L7809CF RoHS compliant?
- What are some common applications of the L7809CF?
The L7809CF is commonly used in local on-card regulation, industrial control systems, consumer electronics, automotive systems, and telecommunication equipment.
- What is the minimum load current required for regulation in the L7809CF?
The minimum load current required for regulation in the L7809CF is 5 mA.
