SW

IN

OUT

OUT

L

L

MAX

,

OUT

MAX

,

L

f

L

V

V

1

V

I

2

I

I

I

´

-

´

=

D

D

+

=

(4)

where:

• IOUT,MAX is the maximum output current

• ΔIL is the inductor current ripple

• fSW is the switching frequency

• L is the inductor value

It is recommended to choose a saturation current for the inductor that is approximately 20% to 30% higher than

IL,MAX. In addition, DC resistance and size should also be taken into account when selecting an appropriate

inductor.

8.2.2.5 Input and Output Capacitor Selection

The architecture of the TPS92201 allows use of tiny ceramic-type output capacitors with low equivalent series

resistance (ESR). These capacitors provide low output voltage ripple and are thus recommended. To keep

its resistance up to high frequencies and to achieve narrow capacitance variation with temperature, it is

recommended to use X7R or X5R dielectric.

The input capacitor is the low impedance energy source for the converter that helps provide stable operation.

A low ESR multilayer ceramic capacitor is recommended for best filtering. For most applications, 4.7-µF input

capacitance is sufficient; a larger value reduces input voltage ripple.

The TPS92201 is designed to operate with an output capacitor of 10 µF to 47 µF, as outlined in Table 8-3.

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TPS92201, TPS92201A

SLVSH40 – NOVEMBER 2023

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