Overview
The L78L09ABUTR is a three-terminal positive voltage regulator from STMicroelectronics, part of the L78L series. These regulators are designed to be highly robust, featuring internal current limiting and thermal shutdown, making them essentially indestructible. With adequate heat-sinking, they can deliver up to 100 mA of output current. The L78L series is intended for fixed voltage regulation in various applications, including local or on-card regulation to eliminate noise and distribution issues associated with single-point regulation. They can also be used with power pass elements to create high-current voltage regulators and serve as a replacement for Zener diode/resistor combinations, offering improvements in quiescent current and noise reduction.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage - Min | 11 | V |
| Input Voltage - Max | 30 | V |
| Output Voltage | 9 | V |
| Output Current | Up to 100 | mA |
| Minimum Operating Temperature | -40 | °C |
| Maximum Operating Temperature | 125 | °C |
| Quiescent Current | 6 | mA |
| Dropout Voltage | 1.7 | V |
| Line Regulation | 225 mV (typical) | mV |
| Load Regulation | 80 mV (typical) | mV |
| Supply Voltage Rejection | 37-44 dB | dB |
| Output Noise Voltage | 70 µV (typical) | µV |
Key Features
- Output current up to 100 mA
- Output voltage of 9 V
- Internal current limiting and thermal shutdown for robust operation
- Short-circuit protection
- No external components required
- Available in either ± 4% (A) or ± 8% (C) selection
- Low quiescent current and noise
- Can be used as a replacement for Zener diode/resistor combinations
Applications
The L78L09ABUTR is suitable for a wide range of applications, including:
- Local or on-card voltage regulation to eliminate noise and distribution problems associated with single-point regulation.
- Use with power pass elements to create high-current voltage regulators.
- Replacement for Zener diode/resistor combinations, offering lower quiescent current and noise.
- Industrial applications requiring robust and reliable voltage regulation.
Q & A
- What is the output voltage of the L78L09ABUTR?
The output voltage of the L78L09ABUTR is 9 V.
- What is the maximum output current of the L78L09ABUTR?
The maximum output current is up to 100 mA.
- What are the operating temperature ranges for the L78L09ABUTR?
The operating temperature range is from -40°C to 125°C.
- Does the L78L09ABUTR require external components for operation?
No, the L78L09ABUTR does not require external components for operation.
- What types of protection does the L78L09ABUTR have?
The L78L09ABUTR has internal current limiting, thermal shutdown, and short-circuit protection.
- What is the quiescent current of the L78L09ABUTR?
The quiescent current is typically 6 mA at 25°C.
- What is the dropout voltage of the L78L09ABUTR?
The dropout voltage is typically 1.7 V.
- How does the L78L09ABUTR perform in terms of line and load regulation?
The line regulation is typically 225 mV, and the load regulation is typically 80 mV.
- What is the supply voltage rejection of the L78L09ABUTR?
The supply voltage rejection is typically between 37-44 dB.
- What is the output noise voltage of the L78L09ABUTR?
The output noise voltage is typically 70 µV.
