Overview
The L79L08ACZ-AP is a three-terminal negative voltage regulator from STMicroelectronics. It is part of the L79L series, which is designed to provide fixed voltage regulation with high reliability and robustness. These regulators employ 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 ideal for local or on-card regulation, helping 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, offering significant improvements over Zener diode/resistor combinations in terms of output impedance, quiescent current, and noise levels.
Key Specifications
| Symbol | Parameter | Test Conditions | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|---|
| VO | Output Voltage | TJ = 25°C | -7.68 | -8 | -8.32 | V |
| VO | Output Voltage | IO = 1 to 40 mA, VI = -10.5 to -23 V | -7.6 | -8 | -8.4 | V |
| ΔVO | Line Regulation | VI = -10.5 to -23 V, TJ = 25°C | 175 | mV | ||
| ΔVO | Load Regulation | IO = 1 to 100 mA, TJ = 25°C | 80 | mV | ||
| Id | Quiescent Current | TJ = 25°C | 6 | mA | ||
| eN | Output Noise Voltage | B = 10 Hz to 100 kHz, TJ = 25°C | 60 | µV | ||
| Vd | Dropout Voltage | 1.7 | V | |||
| VI | DC Input Voltage | VO = -8 V | -35 | V | ||
| IO | Output Current | 100 | mA | |||
| PD | Power Dissipation | Internally limited | mW | |||
| TSTG | Storage Temperature Range | -40 | 150 | °C | ||
| TOP | Operating Junction Temperature Range | 0 | 125 | °C |
Key Features
- Output current up to 100 mA
- Output voltage of -8 V
- Thermal overload protection
- Short-circuit protection
- No external components required
- Output tolerance ±4%
- Internal current limiting and thermal shutdown
- Improved output impedance compared to Zener diode/resistor combinations
- Lower quiescent current and noise levels
Applications
The L79L08ACZ-AP 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 output impedance, lower quiescent current, and reduced noise.
- Various industrial and commercial applications requiring stable and reliable negative voltage regulation.
Q & A
- What is the output voltage of the L79L08ACZ-AP?
The output voltage of the L79L08ACZ-AP is -8 V.
- What is the maximum output current of the L79L08ACZ-AP?
The maximum output current is up to 100 mA.
- Does the L79L08ACZ-AP require external components for operation?
No, the L79L08ACZ-AP does not require any external components for operation.
- What are the thermal protection features of the L79L08ACZ-AP?
The L79L08ACZ-AP features thermal overload protection and short-circuit protection.
- What is the typical quiescent current of the L79L08ACZ-AP?
The typical quiescent current is 6 mA at TJ = 25°C.
- What is the dropout voltage of the L79L08ACZ-AP?
The dropout voltage is 1.7 V.
- What are the package options available for the L79L08ACZ-AP?
The L79L08ACZ-AP is available in TO-92, SO-8, and SOT-89 packages.
- What is the operating junction temperature range for the L79L08ACZ-AP?
The operating junction temperature range is 0 to 125°C.
- Is the L79L08ACZ-AP RoHS compliant?
- What are the benefits of using the L79L08ACZ-AP over Zener diode/resistor combinations?
The L79L08ACZ-AP offers improved output impedance, lower quiescent current, and reduced noise compared to Zener diode/resistor combinations.
