LM78L05ACZ Introduction
The LM78L05ACZ is a linear voltage regulator with built-in protection features. It is available in the TO-92 package. The LM78L05ACZ incorporates current limiting to ensure that the peak output current remains within a safe range, preventing damage to the device and connected components.
Additionally, it includes safe-area protection for output transistors to regulate power dissipation efficiently. In cases where excessive internal power dissipation occurs due to inadequate heat sinking, the thermal shutdown circuit activates to prevent the IC from overheating, ensuring reliable operation and longevity.
LM78L05ACZ Symbol
LM78L05ACZ Footprint
LM78L05ACZ 3D Model
LM78L05ACZ Pinout
VOUT (Pin 1): This pin provides the regulated output voltage. It supplies the power to the load device.
GND (Pin 2): This is the ground pin, which should be connected to the system ground to complete the circuit and provide a reference voltage for the regulator.
VIN (Pin 3): This is the input pin where the unregulated input voltage is supplied. The input voltage should be higher than 5V.
LM78L05ACZ Block Diagram
LM78L05ACZ Typical Application
LM78L05ACZ Specification
| Parameter | Value |
| Output Voltage | 5V |
| Output Current | 100 mA (max) |
| Input Voltage | 30V |
| Dropout Voltage | ~1.7V at 40mA |
| Quiescent Current | 5.5 mA |
| Load Regulation | 60mV |
| Line Regulation | 150mV |
| PSRR | 80dB (120Hz) |
| Operating Temperature | -40°C ~ 125°C |
| Package Type | TO-92-3 |
LM78L05ACZ Features
Output Voltage Tolerances of ±5% Over the Temperature Range
Output Transistor Safe Area Protection
Internal Thermal Overload Protection
Internal Short-Circuit Current Limit
No External Components
Available in 3-Pin TO-92 Package
LM78L05ACZ Applications
Battery Chargers
Portable Instrumentation
LED Lighting
Low Wattage Power Supplies
LM78L05ACZ Package
The LM78L05ACZ in the TO-92-3 package is a three-terminal voltage regulator for low-power applications. It features a small form factor suitable for through-hole mounting, making it ideal for space-constrained designs. It includes built-in thermal shutdown, current limiting, and safe area protection.
How to Use LM78L05ACZ?
To use the LM78L05ACZ, first, connect the VIN (Pin 3) to a DC power source within 7V to 35V. Next, connect GND (Pin 2) to the negative terminal of the power source and the circuit's ground. Finally, connect VOUT (Pin 1) to the load that requires a stable 5V output.
For optimal performance, place a 0.33µF capacitor between VIN and GND to improve stability and filter out input noise. Similarly, connect a 0.1µF capacitor between VOUT and GND to ensure a steady output voltage and prevent oscillations. If the regulator heats up, consider adding a heat sink to maintain safe operating temperatures.
FAQs
What is the LM78L05ACZ?
The LM78L05ACZ is a 5V linear voltage regulator used to provide a stable 5V output for low-power circuits.
What protection does LM78L05ACZ have?
It includes current limiting, thermal shutdown, and safe area protection to prevent damage from overheating or excessive current.
Does LM78L05ACZ generate heat?
Yes, it dissipates heat based on (Vin - Vout) × Iout. Higher input voltage and current increase heat, so proper ventilation or a heat sink may be needed.
Can LM78L05ACZ be used in parallel for higher current output?
No, connecting multiple LM78L05ACZ regulators in parallel is not recommended as it does not balance the load effectively.
