Overview
The L79L05ABD is a three-terminal negative voltage regulator from STMicroelectronics. This component is part of the L79L series, which is designed to provide robust and reliable voltage regulation. The L79L05ABD features internal current limiting and thermal shutdown, making it essentially indestructible. With adequate heat-sinking, it can deliver up to 100 mA of output current. It is intended for use as a fixed voltage regulator in various applications, including local or on-card regulation to eliminate noise and distribution problems associated with single-point regulation.
Key Specifications
| Symbol | Parameter | Test Conditions | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|---|
| VO | Output Voltage | TJ = 25°C | -4.8 | -5 | -5.2 | V |
| VO | Output Voltage | IO = 1 to 40 mA, VI = -7 to -20 V | -4.75 | -5 | -5.25 | V |
| ΔVO | Line Regulation | VI = -7 to -20 V, TJ = 25°C | - | - | 175 mV | mV |
| ΔVO | Load Regulation | IO = 1 to 100 mA, TJ = 25°C | - | - | 80 mV | mV |
| Id | Quiescent Current | TJ = 25°C | - | 6 mA | - | mA |
| eN | Output Noise Voltage | B = 10 Hz to 100 kHz, TJ = 25°C | - | - | 60 µV | µV |
| SVR | Supply Voltage Rejection | VI = -12 to -23 V, f = 120 Hz, IO = 40 mA, TJ = 25°C | - | - | 37-45 dB | dB |
| Vd | Dropout Voltage | - | - | 1.7 V | V |
Key Features
- Output current up to 100 mA
- Output voltage of -5 V
- Internal current limiting and thermal shutdown for enhanced reliability
- No external components required
- Thermal overload protection and short-circuit protection
- Low quiescent current and low noise
- Improves output impedance significantly compared to Zener diode/resistor combinations
Applications
The L79L05ABD is suitable for a wide range of applications, including:
- Local or on-card voltage regulation to eliminate noise and distribution problems
- Replacement for Zener diode/resistor combinations with improved output impedance and lower noise
- Use with power pass elements to create high-current voltage regulators
- General-purpose negative voltage regulation in various electronic systems
Q & A
- What is the maximum output current of the L79L05ABD?
The maximum output current of the L79L05ABD is up to 100 mA.
- What is the output voltage of the L79L05ABD?
The output voltage of the L79L05ABD is -5 V.
- Does the L79L05ABD require external components for operation?
No, the L79L05ABD does not require external components for operation.
- What kind of protection does the L79L05ABD have?
The L79L05ABD features internal current limiting, thermal shutdown, thermal overload protection, and short-circuit protection.
- What is the quiescent current of the L79L05ABD?
The quiescent current of the L79L05ABD is typically 6 mA at TJ = 25°C.
- What is the output noise voltage of the L79L05ABD?
The output noise voltage of the L79L05ABD is typically 60 µV from 10 Hz to 100 kHz at TJ = 25°C.
- What is the dropout voltage of the L79L05ABD?
The dropout voltage of the L79L05ABD is 1.7 V.
- What are the typical applications of the L79L05ABD?
The L79L05ABD is used in local or on-card regulation, as a replacement for Zener diode/resistor combinations, and in general-purpose negative voltage regulation.
- Can the L79L05ABD be used with power pass elements?
- What is the operating temperature range of the L79L05ABD?
The operating temperature range of the L79L05ABD is from -40°C to 125°C.
