Overview
The L78L09ACUTR is a three-terminal positive voltage regulator from STMicroelectronics. It is part of the L78L series, which is known for its robustness and reliability. These regulators employ internal current limiting and thermal shutdown, making them essentially indestructible. The L78L09ACUTR is designed to provide a fixed output voltage of 9V and can deliver up to 100 mA of output current, provided an adequate heat sink is used. This regulator is suitable for a wide range of applications, including local or on-card regulation to eliminate noise and distribution problems associated with single-point regulation.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Voltage | 9 | V |
| Output Polarity | Positive | |
| Number of Outputs | 1 | |
| Maximum Input Voltage | 30 | V |
| Output Current | Up to 100 mA | |
| Line Regulation | 250 mV (VI = 11.5 to 23 V, TJ = 25 °C) | |
| Load Regulation | 80 mV (IO = 1 to 100 mA, TJ = 25 °C) | |
| Quiescent Current | 6 mA (TJ = 25 °C), 5.5 mA (TJ = 125 °C) | |
| Output Noise Voltage | 70 µV (B = 10 Hz to 100 kHz, TJ = 25 °C) | |
| Supply Voltage Rejection | 37 to 44 dB (VI = 12 to 23 V, f = 120 Hz, IO = 40 mA, TJ = 25 °C) | |
| Dropout Voltage | 1.7 V | |
| Operating Junction Temperature Range | 0 to 125 °C | |
| Storage Temperature Range | -65 to 150 °C |
Key Features
- Internal current limiting and thermal shutdown for enhanced reliability and protection.
- No external components required for operation.
- Low quiescent current and low noise output.
- Available in various packages including TO-92, SO-8, and SOT-89.
- Can be used as a replacement for Zener diode/resistor combinations with improved performance.
- High supply voltage rejection ratio (SVR) for better noise immunity.
Applications
- Local or on-card voltage regulation to eliminate noise and distribution problems.
- Use in power pass elements to create high-current voltage regulators.
- Suitable for a wide range of electronic devices requiring stable voltage supply.
- Embedded systems, industrial control systems, and consumer electronics.
Q & A
- What is the output voltage of the L78L09ACUTR?
The output voltage of the L78L09ACUTR is 9V.
- What is the maximum input voltage for the L78L09ACUTR?
The maximum input voltage for the L78L09ACUTR is 30V.
- What is the maximum output current of the L78L09ACUTR?
The maximum output current of the L78L09ACUTR is up to 100 mA.
- Does the L78L09ACUTR require external components for operation?
No, the L78L09ACUTR does not require external components for operation.
- What are the key protection features of the L78L09ACUTR?
The key protection features include internal current limiting and thermal shutdown.
- What is the quiescent current of the L78L09ACUTR at room temperature?
The quiescent current of the L78L09ACUTR at room temperature (TJ = 25 °C) is 6 mA.
- What is the dropout voltage of the L78L09ACUTR?
The dropout voltage of the L78L09ACUTR is 1.7 V.
- What is the operating junction temperature range for the L78L09ACUTR?
The operating junction temperature range for the L78L09ACUTR is 0 to 125 °C.
- Can the L78L09ACUTR be used in high-current applications?
Yes, the L78L09ACUTR can be used with power pass elements to create high-current voltage regulators.
- What are some common applications of the L78L09ACUTR?
Common applications include local or on-card voltage regulation, embedded systems, industrial control systems, and consumer electronics.
