TPS62A02: TPS62A02DRLR

Tool/software:

In my application, I am going to use two DC/DC. One for a 3.3V output and one for a 3.8V output. I have made the corresponding calculations for both outputs and they are as shown below.

1. 3.3V output

• The input voltage VIN is 5 V. An output voltage VOUT of 3.3 V with a maximum current IOUT of 1500 mA is desired. R2 = 100 kΩ (Higher values are not recommended).
  To be obtained by applying its corresponding equation:

• For selection of the LC circuit to obtain the desired values at the VOUT output: The TPS62A02DRLR will be supplied at an input voltage VIN = 5 V and will supply VOUT = 3.3 V. Therefore the duty cycle will be:

• The recommended ripple is ΔiL(%) = 20 %. However, for this application, an even smaller value is desired, i.e. a ripple of ΔiL(%) ≤ 20 % is desired at the output. Therefore, the inductance value for the output will be as follows:

The TPS62A02DRLR is desired to provide an output current IOUT = 1500 mA with a current variation:

• For this application, a small value at the output is desired, i.e. a ripple of ΔVO(%) ≤ 0.001 % → practically no variation ≈ constant. Therefore, the capacitance value for the output will be as follows:

The TPS62A02DRLR is desired to provide an output voltage VOUT = 3.3 V with a voltage variation:

• As for the input capacitor, a 47 μF capacitor shall be used.
• For the total power and current required by the TPS62A02DRLR to perform the conversion:

            2. 3.8V OUTPUT

• The VIN input voltage is 5 V. A VOUT output voltage of 3.8 V with a maximum IOUT current of 2000 mA is desired. R2 = 100 kΩ (Higher values are not recommended).
  To be obtained by applying its corresponding equation:

• For selection of the LC circuit to obtain the desired values at the VOUT output: The TPS62A02DRLR will be supplied at an input voltage VIN = 5 V and will supply VOUT = 3.8 V. Therefore the duty cycle will be:

• The recommended ripple is ΔiL(%) = 20 %. However, for this application, an even smaller value is desired, i.e. a ripple of ΔiL(%) ≤ 20 % is desired at the output. Therefore, the inductance value for the output will be as follows:

The TPS62A02DRLR is desired to provide an output current IOUT = 2000 mA with a current variation:

• For this application, a small value at the output is desired, i.e. a ripple of ΔVO(%) ≤ 0.001 % → practically no variation ≈ constant. Therefore, the capacitance value for the output will be as follows:

The TPS62A02DRLR is desired to provide an output voltage VOUT = 3.8 V with a voltage variation:

• As for the input capacitor, a 47 μF capacitor shall be used.
• For the total power and current required by the TPS62A02DRLR to perform the conversion:

Are these values obtained for resistors, capacitors and inductances adequate?