Overview
The L7809ACV 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 issues associated with single point regulation. The L7809ACV is essentially indestructible due to its internal current limiting, thermal shut-down, and safe area protection features. With adequate heat sinking, it can deliver up to 1.5 A of output current. Although primarily used as a fixed voltage regulator, it can also be configured with external components to achieve adjustable voltage and current outputs.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Voltage | 9 V | V |
| Output Current | Up to 1.5 A | A |
| Input Voltage | Up to 35 V (for VO = 5 to 18 V), Up to 40 V (for VO = 20, 24 V) | V |
| Dropout Voltage | 2 V at IO = 1 A, TJ = 25 °C | V |
| Output Noise Voltage | 10 µV/VO at TA = 25 °C, B = 10 Hz to 100 kHz | µV/VO |
| Output Resistance | 19 mΩ at f = 1 kHz | mΩ |
| Short Circuit Current | 0.2 A at VI = 35 V, TA = 25 °C | A |
| Short Circuit Peak Current | 2.2 A at TJ = 25 °C | A |
| Output Voltage Drift | -1 mV/°C | mV/°C |
| Operating Junction Temperature Range | 0 to 125 °C (L7809AC), -40 to 125 °C (L7809AB) | °C |
| Storage Temperature Range | -65 to 150 °C | °C |
Key Features
- Output current up to 1.5 A
- Fixed output voltage of 9 V
- Thermal overload protection
- Short circuit protection
- Output transition SOA protection
- 2 % output voltage tolerance (A version)
- Guaranteed in extended temperature range (A version)
Applications
The L7809ACV is suitable for a wide range of applications, including:
- Communications equipment
- Computers and peripherals
- Industrial control systems
- Power supplies and voltage regulators in various electronic devices
Q & A
- What is the maximum output current of the L7809ACV?
The maximum output current of the L7809ACV is up to 1.5 A.
- What are the available packages for the L7809ACV?
The L7809ACV is available in TO-220, TO-220FP, D²PAK, and DPAK packages.
- What is the fixed output voltage of the L7809ACV?
The fixed output voltage of the L7809ACV is 9 V.
- Does the L7809ACV have thermal protection?
Yes, the L7809ACV has thermal overload protection and thermal shut-down features.
- What is the dropout voltage of the L7809ACV?
The dropout voltage of the L7809ACV is 2 V at IO = 1 A, TJ = 25 °C.
- Can the L7809ACV be used for adjustable voltage regulation?
Yes, the L7809ACV can be used with external components to achieve adjustable voltage and current outputs.
- What is the operating junction temperature range for the L7809ACV?
The operating junction temperature range for the L7809ACV is 0 to 125 °C (L7809AC) and -40 to 125 °C (L7809AB).
- What is the minimum load current required for regulation?
The minimum load current required for regulation is 5 mA.
- Does the L7809ACV have short circuit protection?
Yes, the L7809ACV has short circuit protection and safe area protection.
- What is the output noise voltage of the L7809ACV?
The output noise voltage of the L7809ACV is 10 µV/VO at TA = 25 °C, B = 10 Hz to 100 kHz.
