Overview
The L78L05ACUTR is a three-terminal positive voltage regulator from STMicroelectronics. It is part of the L78L series, which is designed to provide fixed voltage regulation with high reliability and robustness. These regulators are essentially indestructible due to their internal current limiting and thermal shutdown features. They are suitable for a wide range of applications, including local or on-card regulation, and can be used to eliminate noise and distribution problems associated with single-point regulation.
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 = 7 to 20 V | 4.75 | 5.25 | 5.25 | V |
| Line Regulation (∆VO) | VI = 7.3 to 20 V, TJ = 25 °C | - | - | 150 mV | mV |
| Load Regulation (∆VO) | IO = 1 to 40 mA, TJ = 25 °C | - | - | 30 mV | mV |
| Quiescent Current (Id) | TJ = 25 °C | - | 6 mA | - | mA |
| Dropout Voltage (Vd) | - | - | 1.7 V | V | |
| Output Noise Voltage (eN) | B = 10 Hz to 100 kHz, TJ = 25 °C | - | 70 µV | - | µV |
| Supply Voltage Rejection (SVR) | VI = 12 to 23 V, f = 120 Hz, IO = 40 mA, TJ = 25 °C | 37 dB | 44 dB | - | dB |
Key Features
- Output current up to 100 mA.
- Output voltage of 5 V with ± 4% (A) or ± 8% (C) selection.
- Internal current limiting and thermal shutdown for robustness.
- Short-circuit protection.
- No external components required.
- Low quiescent current and low noise.
Applications
The L78L05ACUTR is suitable for various applications, including:
- Local or on-card voltage regulation to eliminate noise and distribution problems.
- Replacement for Zener diode/resistor combinations, offering improved performance with lower quiescent current and noise).
- Industrial applications requiring reliable and stable voltage regulation).
- Use with power pass elements to create high-current voltage regulators).
Q & A
- What is the output voltage of the L78L05ACUTR?
The output voltage of the L78L05ACUTR is 5 V with a tolerance of ± 4% or ± 8% depending on the selection).
- What is the maximum output current of the L78L05ACUTR?
The L78L05ACUTR can deliver up to 100 mA of output current).
- Does the L78L05ACUTR require external components?
No, the L78L05ACUTR does not require any external components for operation).
- What are the thermal protection features of the L78L05ACUTR?
The L78L05ACUTR features internal current limiting and thermal shutdown for protection against thermal overload).
- What is the dropout voltage of the L78L05ACUTR?
The dropout voltage of the L78L05ACUTR is 1.7 V).
- What are the typical applications of the L78L05ACUTR?
The L78L05ACUTR is used in local or on-card voltage regulation, industrial applications, and as a replacement for Zener diode/resistor combinations).
- What is the quiescent current of the L78L05ACUTR?
The quiescent current of the L78L05ACUTR is typically 6 mA at TJ = 25 °C).
- How does the L78L05ACUTR handle noise and supply voltage rejection?
The L78L05ACUTR has low output noise voltage and good supply voltage rejection, with SVR of 37 to 44 dB at specific conditions).
- What is the operating temperature range of the L78L05ACUTR?
The operating temperature range for the L78L05ACUTR is from 0 to 125 °C).
- Can the L78L05ACUTR be used in high-current applications?
Yes, the L78L05ACUTR can be used with power pass elements to create high-current voltage regulators).
