Instructions for Using the L7985A:

1. Input Voltage:

   • Ensure the input voltage is within the range of 7V to 30V.
   • The input voltage should be at least 2V higher than the output voltage to ensure proper regulation.

2. Output Voltage:

   • The L7985A provides a fixed output voltage of 5V.
   • Use appropriate capacitors on the input and output to stabilize the voltage and reduce ripple.

3. Output Current:

   • The device can provide up to 1.5A of output current, with a typical value of 1.0A.
   • Ensure the load does not exceed the maximum current rating to avoid overheating and potential damage.

4. Quiescent Current:

   • The quiescent current (Iq) is typically 5mA and can go up to 8mA.
   • This current is drawn by the regulator itself and should be considered in power calculations.

5. Dropout Voltage:

   • The dropout voltage (Vdo) is the minimum difference between the input and output voltages required for the regulator to maintain regulation.
   • Typically, this is around 1V but can vary up to 2V.

6. Thermal Considerations:

   • The thermal shutdown (TSD) occurs at approximately 160°C to protect the device from overheating.
   • Ensure adequate heat sinking if the device is expected to operate near its maximum current or in high ambient temperatures.

7. Storage and Operating Temperature:

   • The storage temperature range (Tstg) is from -40°C to 125°C.
   • The operating junction temperature (Tjop) should be kept between -40°C and 125°C.

8. Capacitor Selection:

   • Use a 0.33μF capacitor on the input and a 0.1μF capacitor on the output for stability.
   • For better transient response and noise filtering, larger capacitors (e.g., 10μF) can be used.

9. PCB Layout:

   • Place the input and output capacitors as close as possible to the regulator to minimize inductance and improve performance.
   • Ensure good thermal management by providing a large copper area or heatsink for heat dissipation.

10. Polarity:

    • The L7985A is a negative voltage regulator, so the input and output pins should be connected correctly to avoid damage.

By following these guidelines, you can ensure reliable operation of the L7985A in your circuit.