Overview
The L79L05ABUTR is a part of the L79L series of three-terminal negative voltage regulators produced by STMicroelectronics. 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 L79L series is intended for use as fixed voltage regulators in various applications, including local or on-card regulation to eliminate noise and distribution problems associated with single-point regulation. They can also be used with power pass elements to create high-current voltage regulators.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Current | Up to 100 | mA |
| Output Voltage | -5 | V |
| Output Tolerance | +/- 4% | |
| Thermal Overload Protection | Yes | |
| Short-Circuit Protection | Yes | |
| Package | SOT-89 | |
| Operating Junction Temperature Range | -40 to 125 | °C |
| Thermal Resistance Junction-Case (max.) | 15 | °C/W |
| Thermal Resistance Junction-Ambient (max.) | 115 | °C/W |
| Quiescent Current | 6 mA (at 25°C), 5.5 mA (at 125°C) | |
| Output Noise Voltage | 60 µV (B = 10 Hz to 100 kHz, at 25°C) | |
| Dropout Voltage | 1.7 V |
Key Features
- Output current up to 100 mA
- Output voltage of -5 V
- Thermal overload protection and short-circuit protection
- No external components required
- Output tolerance of +/- 4%
- Can be used as a Zener diode/resistor combination replacement, offering improved output impedance and lower quiescent current and noise
Applications
The L79L05ABUTR 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 improved performance in terms of output impedance, quiescent current, and noise.
Q & A
- What is the maximum output current of the L79L05ABUTR?
The maximum output current is up to 100 mA.
- What are the available output voltages for the L79L series?
The L79L series offers output voltages of -5, -8, -12, and -15 V.
- Does the L79L05ABUTR have built-in protection features?
Yes, it features thermal overload protection and short-circuit protection.
- What is the output tolerance of the L79L05ABUTR?
The output tolerance is +/- 4%.
- What package type is the L79L05ABUTR available in?
The L79L05ABUTR is available in the SOT-89 package.
- What is the operating junction temperature range for the L79L05ABUTR?
The operating junction temperature range is -40 to 125°C.
- Does the L79L05ABUTR require any external components?
No, it does not require any external components.
- How does the L79L05ABUTR compare to Zener diode/resistor combinations?
The L79L05ABUTR offers improved output impedance, lower quiescent current, and lower noise compared to Zener diode/resistor combinations.
- What is the quiescent current of the L79L05ABUTR?
The quiescent current is 6 mA at 25°C and 5.5 mA at 125°C.
- What is the dropout voltage of the L79L05ABUTR?
The dropout voltage is 1.7 V.
