Overview
The L78L05CD, part of the L78L series from STMicroelectronics, is a three-terminal positive voltage regulator. This regulator is designed to be highly robust, featuring internal current limiting and thermal shutdown, making it essentially indestructible. With adequate heat-sinking, it can deliver up to 100 mA of output current. The L78L series is intended for use as fixed voltage regulators in various applications, including local or on-card regulation to eliminate noise and distribution issues associated with single-point regulation. Additionally, these regulators can be used with power pass elements to create high-current voltage regulators, and they can replace Zener diode/resistor combinations with improved performance, lower quiescent current, and reduced noise.
Key Specifications
| Parameter | Test Conditions | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|
| Output Voltage | TJ = 25 °C | 4.8 | 5 | 5.2 | V |
| Output Current | 100 | mA | |||
| Line Regulation | VI = 10.5 to 20 V, TJ = 25 °C | 150 | 200 | mV | |
| Load Regulation | IO = 1 to 100 mA, TJ = 25 °C | 40 | 80 | mV | |
| Quiescent Current | TJ = 25 °C | 6 | mA | ||
| Quiescent Current Change | IO = 1 to 40 mA | 0.2 | mA | ||
| Output Noise Voltage | B = 10 Hz to 100 kHz, TJ = 25 °C | 60 | µV | ||
| Supply Voltage Rejection | VI = 9 to 20 V, f = 120 Hz, IO = 40 mA, TJ = 25 °C | 36 | 45 | dB | |
| Dropout Voltage | 1.7 | V |
Key Features
- Output current up to 100 mA
- Output voltage of 5 V
- Thermal overload protection
- Short-circuit protection
- No external components required
- Available in ±4% (A) or ±8% (C) selection
Applications
The L78L05CD is suitable for a wide range of applications, including local or on-card voltage regulation to eliminate noise and distribution problems. It can be used in various electronic devices that require stable and regulated voltage supply. Additionally, it can be used with power pass elements to create high-current voltage regulators and as a replacement for Zener diode/resistor combinations.
Q & A
- What is the maximum output current of the L78L05CD?
The maximum output current of the L78L05CD is up to 100 mA. - What is the output voltage of the L78L05CD?
The output voltage of the L78L05CD is 5 V. - Does the L78L05CD require external components?
No, the L78L05CD does not require external components. - What kind of protection does the L78L05CD offer?
The L78L05CD offers thermal overload protection and short-circuit protection. - What is the quiescent current of the L78L05CD?
The quiescent current of the L78L05CD is typically 6 mA at TJ = 25 °C. - What is the dropout voltage of the L78L05CD?
The dropout voltage of the L78L05CD is 1.7 V. - How does the L78L05CD handle noise and distribution issues?
The L78L05CD is designed for local or on-card regulation to eliminate noise and distribution problems associated with single-point regulation. - Can the L78L05CD be used as a replacement for Zener diode/resistor combinations?
Yes, the L78L05CD can be used as a replacement for Zener diode/resistor combinations, offering improved performance, lower quiescent current, and reduced noise. - What is the supply voltage rejection of the L78L05CD?
The supply voltage rejection of the L78L05CD is 36 to 45 dB at VI = 9 to 20 V, f = 120 Hz, and IO = 40 mA at TJ = 25 °C. - What are the typical operating temperatures for the L78L05CD?
The L78L05CD operates over a junction temperature range of 0 to 125 °C.
