Overview
The L7809CP is a three-terminal positive voltage regulator from STMicroelectronics, part of the L78 series. This regulator is available in various packages, including TO-220, TO-220FP, D²PAK, and DPAK. It is designed to provide local on-card regulation, eliminating the distribution problems associated with single-point regulation. The L7809CP is particularly useful in a wide range of applications due to its robust features and reliable performance.
Key Specifications
| Parameter | Test Conditions | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|
| Output Voltage (VO) | TJ = 25°C | 8.82 | 9 | 9.18 | V |
| Output Voltage (VO) | IO = 5 mA to 1 A, VI = 11.5 to 22 V | 8.65 | 9 | 9.35 | V |
| Dropout Voltage (Vd) | IO = 1 A, TJ = 25°C | 2 | 2.5 | V | |
| Output Resistance (RO) | f = 1 kHz | 20 | mΩ | ||
| Short Circuit Current (Isc) | VI = 35 V, TJ = 25°C | 0.75 | 1.2 | A | |
| Short Circuit Peak Current (Iscp) | TJ = 25°C | 1.3 | 2.2 | A | |
| Output Voltage Drift (∆VO/∆T) | -1.5 | mV/°C | |||
| Supply Voltage Rejection (SVR) | VI = 8 to 18 V, f = 120 Hz | 62 | dB | ||
| Output Noise Voltage (eN) | TJ = 25°C, B = 10 Hz to 100 kHz | 10 | µV/VO | ||
| Thermal Resistance Junction-Case (RthJC) | 5 | °C/W | |||
| Thermal Resistance Junction-Ambient (RthJA) | 60 | °C/W |
Key Features
- High Current Capability: The L7809CP can deliver up to 1.5 A of output current, making it suitable for applications requiring substantial power.
- Fixed Output Voltage: The regulator provides a fixed output voltage of 9 V, with a tolerance of ±2% for the A version.
- Thermal Overload Protection: Internal thermal shut-down protects the device from overheating.
- Short Circuit Protection: The regulator includes short circuit current limiting and peak current protection.
- Output Transition SOA Protection: Safe operating area protection ensures the device operates within safe limits.
- Low Dropout Voltage: A dropout voltage of 2 V at 1 A output current minimizes power loss.
- Low Output Noise: The output noise voltage is 10 µV/VO, ensuring a clean output voltage.
- Wide Operating Temperature Range: The device operates over a temperature range of 0 to 125°C for the C version and -40 to 125°C for the AB version.
Applications
- Local On-Card Regulation: The L7809CP is ideal for providing local regulation on PCBs, reducing the need for complex power distribution systems.
- Industrial Control Systems: Suitable for use in industrial control systems where reliable and stable voltage regulation is crucial.
- Consumer Electronics: Used in various consumer electronics such as audio equipment, TVs, and other appliances requiring stable DC power.
- Automotive Systems: Can be used in automotive systems where robust and reliable voltage regulation is necessary.
- Medical Devices: Applicable in medical devices that require precise and stable voltage regulation.
Q & A
- What is the output voltage of the L7809CP?
The output voltage of the L7809CP is 9 V with a tolerance of ±2% for the A version.
- What is the maximum output current of the L7809CP?
The L7809CP can deliver up to 1.5 A of output current.
- Does the L7809CP have thermal protection?
Yes, the L7809CP includes internal thermal shut-down to protect against overheating.
- What is the dropout voltage of the L7809CP?
The dropout voltage of the L7809CP is 2 V at 1 A output current.
- What are the package options for the L7809CP?
The L7809CP is available in TO-220, TO-220FP, D²PAK, and DPAK packages.
- What is the operating temperature range of the L7809CP?
The operating temperature range is 0 to 125°C for the C version and -40 to 125°C for the AB version.
- Does the L7809CP have short circuit protection?
Yes, the L7809CP includes short circuit current limiting and peak current protection.
- What is the output noise voltage of the L7809CP?
The output noise voltage is 10 µV/VO.
- Can the L7809CP be used for adjustable voltage regulation?
Yes, the L7809CP can be used with external components to obtain adjustable voltage and currents.
- What is the minimum load current required for regulation?
The minimum load current required for regulation is 5 mA.
