Overview
The L79L12ACUTR is a negative voltage regulator from STMicroelectronics, part of the L79L series. These regulators are designed to provide stable negative output voltages and are used as replacements for Zener diode/resistor combinations, offering improved output impedance, lower quiescent current, and reduced noise. The L79L12ACUTR specifically provides an output voltage of -12V and is suitable for a wide range of applications requiring local or on-card regulation to eliminate noise and distribution problems associated with single-point regulation.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Voltage | -11.5 to -12.5 | V |
| Output Current | Up to 100 mA | mA |
| Input Voltage Range | -14.5 to -27 V | V |
| Line Regulation | 250 mV (VI = -14.5 to -27 V, TJ = 25°C) | mV |
| Load Regulation | 100 mV (IO = 1 to 100 mA, TJ = 25°C) | mV |
| Quiescent Current | 6.5 mA (TJ = 25°C), 6 mA (TJ = 125°C) | mA |
| Output Noise Voltage | 80 µV (B = 10 Hz to 100 kHz, TJ = 25°C) | µV |
| Supply Voltage Rejection | 37 to 42 dB (VI = -15 to -25 V, f = 120 Hz, IO = 40 mA, TJ = 25°C) | dB |
| Dropout Voltage | 1.7 V | V |
| Thermal Overload Protection | Yes | |
| Short-Circuit Protection | Yes | |
| Operating Junction Temperature Range | 0 to 125 °C | °C |
| Storage Temperature Range | -40 to 150 °C | °C |
Key Features
- Output current up to 100 mA
- Output voltage of -12V with ±4% tolerance
- Thermal overload protection and short-circuit protection
- No external components required
- Improved output impedance and lower noise compared to Zener diode/resistor combinations
- Low quiescent current
- Available in TO-92, SO-8, and SOT-89 packages
Applications
The L79L12ACUTR is suitable for a variety of applications, including local or on-card regulation to eliminate noise and distribution problems. It can be used in:
- Power supply systems requiring stable negative voltages
- High-current voltage regulators when used with power pass elements
- Electronic devices needing low noise and high stability in their power supply
- Industrial and consumer electronics where reliable voltage regulation is critical
Q & A
- What is the output voltage of the L79L12ACUTR?
The output voltage of the L79L12ACUTR is -12V with a tolerance of ±4%. - What is the maximum output current of the L79L12ACUTR?
The maximum output current is up to 100 mA. - Does the L79L12ACUTR require external components?
No, the L79L12ACUTR does not require any external components. - What are the key protection features of the L79L12ACUTR?
The L79L12ACUTR features thermal overload protection and short-circuit protection. - What are the available package options for the L79L12ACUTR?
The L79L12ACUTR is available in TO-92, SO-8, and SOT-89 packages. - What is the operating junction temperature range of the L79L12ACUTR?
The operating junction temperature range is 0 to 125 °C. - What is the storage temperature range of the L79L12ACUTR?
The storage temperature range is -40 to 150 °C. - How does the L79L12ACUTR improve upon Zener diode/resistor combinations?
The L79L12ACUTR offers improved output impedance, lower quiescent current, and reduced noise compared to Zener diode/resistor combinations. - What is the typical quiescent current of the L79L12ACUTR?
The typical quiescent current is 6.5 mA at 25°C and 6 mA at 125°C. - What is the dropout voltage of the L79L12ACUTR?
The dropout voltage is 1.7 V.
