Overview
The L78L05ACD is a three-terminal positive voltage regulator produced by STMicroelectronics. This component is part of the L78L series, which is known for its robust design and internal protection features. The L78L05ACD is specifically designed to provide a fixed output voltage of 5V, making it suitable for a wide range of applications requiring stable voltage regulation.
Key features include internal current limiting and thermal shutdown, which make the regulator essentially indestructible when adequate heat-sinking is provided. It can deliver up to 100 mA of output current and is available in various packages such as TO-92, SO-8, and SOT-89.
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 = 5.3 to 20 V | 2.97 | 3.63 | 3.63 | V |
| Line Regulation (∆VO) | VI = 5.3 to 20 V, TJ = 25°C | - | - | 150 mV | mV |
| Load Regulation (∆VO) | IO = 1 to 100 mA, TJ = 25°C | - | - | 80 mV | mV |
| Quiescent Current (Id) | TJ = 25°C | - | 6 | 6 mA | mA |
| Quiescent Current Change (∆Id) | IO = 1 to 40 mA | - | - | 0.2 mA | mA |
| Output Noise Voltage (eN) | B = 10 Hz to 100 kHz, TJ = 25°C | - | - | 70 µV | µV |
| Supply Voltage Rejection (SVR) | VI = 9 to 20 V, f = 120 Hz, IO = 40 mA, TJ = 25°C | - | - | 39 to 46 dB | dB |
| Dropout Voltage (Vd) | - | - | - | 1.7 V | V |
Key Features
- Internal Current Limiting and Thermal Shutdown: These features make the regulator essentially indestructible when adequate heat-sinking is provided.
- Fixed Output Voltage: The L78L05ACD provides a fixed output voltage of 5V.
- High Output Current: Capable of delivering up to 100 mA of output current.
- No External Components Required: The regulator does not require any external components for operation.
- Low Quiescent Current: The quiescent current is typically 6 mA at 25°C.
- Low Noise and High Supply Voltage Rejection: Offers low output noise and high supply voltage rejection, making it suitable for noise-sensitive applications.
- Various Packages Available: Available in TO-92, SO-8, and SOT-89 packages.
Applications
- Local or On-Card Regulation: Ideal for eliminating noise and distribution problems associated with single-point regulation.
- Power Pass Elements: Can be used with power pass elements to create high-current voltage regulators.
- Zener Diode/Resistor Combination Replacement: Offers improvements over traditional Zener diode/resistor combinations with lower quiescent current and lower noise.
- General Electronic Devices: Suitable for use in a wide range of electronic devices requiring stable voltage regulation.
Q & A
- What is the output voltage of the L78L05ACD?
The output voltage of the L78L05ACD is 5V.
- What is the maximum output current of the L78L05ACD?
The maximum output current is up to 100 mA.
- Does the L78L05ACD require external components for operation?
No, the L78L05ACD does not require any external components for operation.
- What are the key protection features of the L78L05ACD?
The key protection features include internal current limiting and thermal shutdown.
- What is the typical quiescent current of the L78L05ACD?
The typical quiescent current is 6 mA at 25°C.
- What are the available packages for the L78L05ACD?
The L78L05ACD is available in TO-92, SO-8, and SOT-89 packages.
- What is the dropout voltage of the L78L05ACD?
The dropout voltage is 1.7 V.
- How does the L78L05ACD perform in terms of noise and supply voltage rejection?
The L78L05ACD offers low output noise and high supply voltage rejection, making it suitable for noise-sensitive applications.
- Can the L78L05ACD be used as a replacement for Zener diode/resistor combinations?
Yes, the L78L05ACD can be used as a replacement for Zener diode/resistor combinations, offering improvements in terms of lower quiescent current and lower noise.
- What are some common applications of the L78L05ACD?
Common applications include local or on-card regulation, use with power pass elements, and replacement for Zener diode/resistor combinations in various electronic devices.
