Overview
The L78L12ABUTR is a three-terminal positive voltage regulator from STMicroelectronics. It is part of the L78L series, which is designed to provide fixed output voltages with high reliability and robustness. These regulators are equipped with internal current limiting and thermal shutdown, making them essentially indestructible when adequate heat-sinking is provided. They are 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 | 12 | V |
| Output Current | Up to 100 | mA |
| Line Regulation | 230 mV (VI = 12.5 to 23 V, TJ = 25 °C) | mV |
| Load Regulation | 80 mV (IO = 1 to 100 mA, TJ = 25 °C) | mV |
| Quiescent Current | 6 mA (TJ = 25 °C), 5.5 mA (TJ = 125 °C) | mA |
| Output Noise Voltage | 40 µV (B = 10 Hz to 100 kHz, TJ = 25 °C) | µV |
| Supply Voltage Rejection | 41 dB (VI = 6.3 to 16.3 V, f = 120 Hz, IO = 40 mA, TJ = 25 °C) | dB |
| Dropout Voltage | 2 V | V |
| Operating Temperature Range | -40 to 125 °C | °C |
| Package Type | SOT-89 |
Key Features
- Output current up to 100 mA
- Fixed output voltage of 12 V
- Internal current limiting and thermal shutdown for robust operation
- No external components required
- Short-circuit protection and thermal overload protection
- Available in ± 4% (A) or ± 8% (C) selection
- Low quiescent current and low noise
Applications
- Local or on-card regulation for noise elimination and distribution problem mitigation
- Replacement for Zener diode/resistor combinations
- Use with power pass elements to create high-current voltage regulators
- Industrial applications requiring reliable voltage regulation
Q & A
- What is the maximum output current of the L78L12ABUTR?
The maximum output current is up to 100 mA.
- What is the fixed output voltage of the L78L12ABUTR?
The fixed output voltage is 12 V.
- Does the L78L12ABUTR require external components for operation?
No, it does not require any external components.
- What are the key protection features of the L78L12ABUTR?
It includes internal current limiting, thermal shutdown, and short-circuit protection.
- What is the operating temperature range of the L78L12ABUTR?
The operating temperature range is -40 to 125 °C.
- What package type is the L78L12ABUTR available in?
It is available in the SOT-89 package type.
- How does the L78L12ABUTR improve upon Zener diode/resistor combinations?
It offers lower quiescent current and lower noise compared to Zener diode/resistor combinations.
- Can the L78L12ABUTR be used in high-current applications?
Yes, it can be used with power pass elements to create high-current voltage regulators.
- What is the quiescent current of the L78L12ABUTR at room temperature?
The quiescent current is 6 mA at 25 °C.
- What is the dropout voltage of the L78L12ABUTR?
The dropout voltage is 2 V.
