Overview
The L79L08ACD13TR is a three-terminal negative voltage regulator from STMicroelectronics. It is part of the L79L series, which is known for its robust design, incorporating internal current limiting and thermal shutdown, making these regulators essentially indestructible. With adequate heat-sinking, these regulators can deliver up to 100 mA of output current. They are designed for use in a wide range of applications, including local or on-card regulation to eliminate noise and distribution problems associated with single-point regulation. Additionally, they can be used with power pass elements to create high-current voltage regulators, and they offer significant improvements over Zener diode/resistor combinations in terms of output impedance, quiescent current, and noise levels.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Voltage | -8 V | V |
| Output Current | Up to 100 mA | mA |
| Input Voltage Range | -10.5 to -23 V | V |
| Output Tolerance | +/- 4% | % |
| Line Regulation | 125 mV (VI = -11 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 | 60 µV (B = 10 Hz to 100 kHz, TJ = 25°C) | µV |
| Supply Voltage Rejection | 37 to 45 dB (VI = -12 to -23 V, f = 120 Hz, IO = 40 mA, TJ = 25°C) | dB |
| Dropout Voltage | 1.7 V | V |
| Thermal Resistance Junction-Case | 20 °C/W (SO-8 package) | °C/W |
| Thermal Resistance Junction-Ambient | 55 °C/W (SO-8 package with 6 cm² of copper board heat-sink) | °C/W |
| Operating Junction Temperature Range | -40 to 125 °C | °C |
| Storage Temperature Range | -40 to 150 °C | °C |
| Package | SO-8 |
Key Features
- Output current up to 100 mA
- Output voltages of -8 V
- Thermal overload protection
- Short-circuit protection
- No external components required
- Output tolerance of +/- 4%
- Improved output impedance compared to Zener diode/resistor combinations
- Lower quiescent current and noise levels
Applications
The L79L08ACD13TR is suitable for a variety of applications, including:
- Local or on-card voltage regulation to eliminate noise and distribution problems.
- High-current voltage regulators when used with power pass elements.
- Replacement for Zener diode/resistor combinations, offering better output impedance, lower quiescent current, and reduced noise.
- General-purpose negative voltage regulation in electronic devices.
Q & A
- What is the maximum output current of the L79L08ACD13TR?
Up to 100 mA.
- What are the available output voltages for the L79L series?
-5 V, -8 V, -12 V, and -15 V.
- Does the L79L08ACD13TR require external components for operation?
No, it does not require external components.
- What is the output tolerance of the L79L08ACD13TR?
+/- 4%.
- What kind of thermal protection does the L79L08ACD13TR have?
Thermal overload protection and short-circuit protection.
- What is the typical quiescent current of the L79L08ACD13TR at 25°C?
6 mA.
- What is the dropout voltage of the L79L08ACD13TR?
1.7 V.
- What is the operating junction temperature range for the L79L08ACD13TR?
-40 to 125 °C.
- What package types are available for the L79L series?
SO-8, TO-92, and SOT-89.
- Is the L79L08ACD13TR RoHS compliant?
