Overview
The L78L05ABD is a three-terminal positive voltage regulator produced by STMicroelectronics. It is part of the L78L series, which is known for its robust design and internal protection features. This regulator is designed to provide a fixed output voltage of 5 volts and is suitable for a wide range of applications requiring local or on-card voltage regulation. The L78L05ABD is essentially indestructible due to its internal current limiting and thermal shutdown capabilities, making it a reliable choice for various electronic systems.
Key Specifications
| Parameter | Test Conditions | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|
| Output Voltage (VO) | TJ = 25°C | 4.8 | 5 | 5.2 | V |
| Output Voltage (VO) | IO = 1 to 40 mA, VI = 10.5 to 23 V | 4.8 | 5 | 5.2 | V |
| Line Regulation (∆VO) | VI = 10.5 to 23 V, TJ = 25°C | - | - | 175 mV | mV |
| Load Regulation (∆VO) | IO = 1 to 100 mA, TJ = 25°C | - | - | 80 mV | mV |
| Quiescent Current (Id) | TJ = 25°C | - | 6 | - | mA |
| Quiescent Current Change (∆Id) | IO = 1 to 40 mA | - | - | 0.1 mA | mA |
| Output Noise Voltage (eN) | B = 10 Hz to 100 kHz, TJ = 25°C | - | - | 60 µV | µV |
| Supply Voltage Rejection (SVR) | VI = 12 to 23 V, f = 120 Hz, IO = 40 mA, TJ = 25°C | - | - | 37 dB | dB |
| Dropout Voltage (Vd) | - | - | - | 1.7 V | V |
| Input Voltage (VI) | - | - | - | 30 V | V |
| Output Current (IO) | - | - | - | 100 mA | mA |
| Operating Junction Temperature (TJ) | - | - | - | -40 to 125°C | °C |
Key Features
- Internal Current Limiting and Thermal Shutdown: The L78L05ABD features internal current limiting and thermal shutdown, making it essentially indestructible and highly reliable.
- No External Components Required: This regulator does not require any external components to operate, simplifying the design and reducing component count.
- Fixed Output Voltage: It provides a fixed output voltage of 5 volts, suitable for a variety of applications.
- Low Quiescent Current: The regulator has a low quiescent current, which helps in reducing power consumption.
- Low Output Noise: The L78L05ABD has low output noise, making it suitable for applications requiring stable voltage regulation.
- High Supply Voltage Rejection: It offers high supply voltage rejection, ensuring stable output voltage even with varying input voltages.
Applications
- Local or On-Card Regulation: The L78L05ABD is ideal for local or on-card voltage regulation, helping to eliminate noise and distribution problems associated with single-point regulation.
- Power Pass Elements: It can be used with power pass elements to create high-current voltage regulators.
- Zener Diode/Resistor Combination Replacement: The regulator can replace Zener diode/resistor combinations, offering improvements in terms of lower quiescent current and lower noise.
- General Electronic Systems: It is suitable for various general electronic systems requiring stable and reliable voltage regulation.
Q & A
- What is the output voltage of the L78L05ABD?
The output voltage of the L78L05ABD is 5 volts.
- What are the key protection features of the L78L05ABD?
The key protection features include internal current limiting and thermal shutdown.
- Does the L78L05ABD require any external components to operate?
No, the L78L05ABD does not require any external components to operate.
- What is the maximum output current of the L78L05ABD?
The maximum output current is 100 mA.
- What is the operating junction temperature range for the L78L05ABD?
The operating junction temperature range is -40 to 125°C.
- What is the quiescent current of the L78L05ABD at 25°C?
The quiescent current at 25°C is 6 mA.
- What is the dropout voltage of the L78L05ABD?
The dropout voltage is 1.7 V.
- What are some common applications of the L78L05ABD?
Common applications include local or on-card regulation, use with power pass elements, and replacement of Zener diode/resistor combinations.
- How does the L78L05ABD handle noise and voltage stability?
The regulator has low output noise and high supply voltage rejection, ensuring stable output voltage.
- What are the available packages for the L78L05ABD?
The L78L series, including the L78L05ABD, is available in packages such as TO-92, SO-8, and SOT-89.
