TP8485E

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Instructions for TP8485E:

1. Input Voltage Connection:

   • Connect the input voltage within the operating range of 2.7V to 5.5V.

2. Output Voltage Configuration:

   • The output voltage is fixed at 3.3V. Ensure that your circuit design can accommodate this fixed output voltage.

3. Quiescent Current Consideration:

   • Be aware that the quiescent current is typically 60μA when no load is applied and the input voltage is 5V.

4. Dropout Voltage Management:

   • The dropout voltage is typically 300mV at an output current of 100mA. Ensure that the input voltage remains sufficiently higher than the output voltage by this margin.

5. Output Current Limitation:

   • The device can supply a continuous output current up to 250mA. Design your load to stay within this limit.

6. PSRR Optimization:

   • The power supply rejection ratio is 70dB at 1kHz. This helps in filtering out noise from the input supply. Place appropriate capacitors near the input and output terminals to enhance this performance.

7. Line and Load Regulation:

   • Line regulation is 0.1% over the input voltage range, and load regulation is 0.2% over the output current range. These parameters ensure stable output voltage under varying conditions.

8. Capacitor Selection:

   • Use input and output capacitors as specified in the datasheet to stabilize the regulator and improve transient response. Typically, ceramic capacitors are recommended due to their low ESR.

9. Thermal Considerations:

   • Ensure adequate heat dissipation if operating near the maximum output current, especially in environments with higher ambient temperatures.

10. PCB Layout:

    • Follow good PCB layout practices, including short leads for input and output capacitors, to minimize noise and parasitic effects.