Instructions:

1. Input Voltage (VIN):

   • Ensure the input voltage is within the range of 3.0V to 42V.
   • Use appropriate input capacitors to stabilize the input voltage.

2. Output Voltage (VOUT):

   • The output voltage can be adjusted from 0.8V to 40V using external resistors.
   • Use the formula ( V_ = 0.8 left(1 + fracright) ) to set the desired output voltage.

3. Output Current (IOUT):

   • The device can provide a continuous output current of up to 3.5A, with a peak of 4.0A.
   • Ensure adequate heat sinking for high current applications.

4. Switching Frequency (fSW):

   • The switching frequency can be set between 500kHz and 2000kHz using an external resistor.
   • Use the formula ( f_ = frac{1.1 times 10^6} ) where ( R_f ) is in ohms.

5. Efficiency (η):

   • The device can achieve up to 96% efficiency under optimal conditions.
   • Efficiency is influenced by input voltage, output voltage, and load current.

6. Quiescent Current (IQ):

   • The quiescent current is typically 25μA at 12V input with no load.
   • Ensure low quiescent current to minimize power loss in low-power applications.

7. Shutdown Current (ISD):

   • The shutdown current is typically 1μA when the enable pin (VEN) is set to 0V.
   • Use the enable pin to control the operation of the device.

8. Soft-Start Time (tSS):

   • The soft-start time is typically 4.5ms.
   • This helps to reduce inrush current during startup.

9. Thermal Shutdown (TSD):

   • The device will shut down if the junction temperature exceeds 160°C.
   • Ensure proper thermal management to prevent overheating.

10. Operating Junction Temperature (TJ):

    • The operating junction temperature range is from -65°C to 150°C.
    • Ensure the device operates within this temperature range to avoid damage.

11. Storage Temperature (TSTG):

    • The storage temperature range is from -65°C to 150°C.
    • Store the device in a suitable environment to prevent damage.

Additional Notes:

• Always refer to the datasheet for detailed specifications and application notes.
• Use recommended external components for optimal performance.
• Follow good PCB layout practices to ensure reliable operation.