Instructions for Using TPS54228DDAR

1. Input Voltage Range:

   • Ensure the input voltage is within the specified range of 3V to 17V to avoid damage to the device.

2. Output Voltage Setting:

   • Use the feedback resistor network (RFB1 and RFB2) to set the desired output voltage. The formula for calculating the output voltage is: [ V_ = V_ left(1 + fracright) ]
   • Where ( V_ ) is typically 0.9V.

3. Inductor Selection:

   • Choose an inductor with a saturation current higher than the maximum output current and a low DC resistance to minimize power losses.
   • Typical inductor values range from 4.7μH to 10μH.

4. Capacitor Selection:

   • Use a low ESR ceramic capacitor for the input (CIN) to filter high-frequency noise.
   • For the output (COUT), use a ceramic capacitor with a low ESR to ensure stability and good transient response.
   • Typical values for COUT are 22μF to 47μF.

5. Thermal Management:

   • Ensure adequate heat dissipation by providing a good thermal path from the device to the PCB or heatsink.
   • The thermal resistance (θJA) should be considered to keep the junction temperature within safe limits.

6. Shutdown Function:

   • The shutdown function can be controlled by applying a logic high or low signal to the EN pin.
   • When the EN pin is low, the device enters a low-power shutdown mode with minimal quiescent current.

7. Layout Considerations:

   • Place the input and output capacitors as close as possible to the device to minimize parasitic inductance.
   • Keep the ground plane solid and wide to reduce noise and improve thermal performance.

8. Protection Features:

   • The device includes overcurrent protection, thermal shutdown, and undervoltage lockout (UVLO) to protect against fault conditions.

9. Application Examples:

   • Refer to the datasheet for detailed application circuits and layout guidelines to ensure optimal performance in your specific application.