Overview
The L7809ACD2T is a part of the L78 series of three-terminal positive voltage regulators produced by STMicroelectronics. This regulator is available in the D²PAK package and is designed to provide a fixed output voltage of 9V. It is highly versatile and can be used in a wide range of applications, including local on-card regulation, which helps eliminate distribution problems associated with single point regulation. The device is equipped with internal current limiting, thermal shut-down, and safe area protection, making it robust and reliable. With adequate heat sinking, it can deliver up to 1 A of output current.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Voltage | 8.64 to 9.36 | V |
| Output Current | Up to 1 A | A |
| Input Voltage | Up to 35 V (for VO = 5 to 18 V), Up to 40 V (for VO = 20, 24 V) | V |
| Thermal Resistance Junction-Case | 3 °C/W | °C/W |
| Thermal Resistance Junction-Ambient | 62.5 °C/W | °C/W |
| Operating Junction Temperature Range | -40 to 125 °C | °C |
| Dropout Voltage | 2 V | V |
| Output Noise Voltage | 10 µV/VO | µV/VO |
| Output Resistance | 20 mΩ | mΩ |
| Short Circuit Current | 0.2 A | A |
| Short Circuit Peak Current | 2.2 A | A |
| Output Voltage Drift | -1.5 mV/°C | mV/°C |
Key Features
- Output current up to 1 A
- Fixed output voltage of 9V
- Thermal overload protection
- Short circuit protection
- Output transition SOA protection
- 2% output voltage tolerance (A version)
- Guaranteed in extended temperature range (A version)
- Internal current limiting and thermal shut-down
- Safe area protection
- Available in D²PAK package
Applications
The L7809ACD2T is suitable for various applications, including:
- Communications equipment
- Computers and peripherals
- Industrial control systems
- Local on-card regulation in complex electronic systems
- Adjustable voltage and current regulation with external components
Q & A
- What is the output voltage of the L7809ACD2T?
The output voltage of the L7809ACD2T is 9V, with a tolerance range of 8.64 to 9.36V.
- What is the maximum output current of the L7809ACD2T?
The maximum output current of the L7809ACD2T is up to 1 A.
- What are the key protection features of the L7809ACD2T?
The L7809ACD2T features thermal overload protection, short circuit protection, and output transition SOA protection.
- What is the operating junction temperature range of the L7809ACD2T?
The operating junction temperature range of the L7809ACD2T is -40 to 125 °C.
- What package is the L7809ACD2T available in?
The L7809ACD2T is available in the D²PAK package.
- Can the L7809ACD2T be used for adjustable voltage regulation?
Yes, the L7809ACD2T can be used with external components to obtain adjustable voltage and currents.
- What is the dropout voltage of the L7809ACD2T?
The dropout voltage of the L7809ACD2T is 2 V.
- What is the output noise voltage of the L7809ACD2T?
The output noise voltage of the L7809ACD2T is 10 µV/VO.
- What is the minimum load current required for regulation?
The minimum load current required for regulation is 5 mA.
- What are some common applications of the L7809ACD2T?
The L7809ACD2T is commonly used in communications equipment, computers and peripherals, industrial control systems, and local on-card regulation.
