Datasheet

Application information STCC2540
18/33 DocID024711 Rev 5
5.8 Input and output capacitors
For proper functionality the STCC2540 device requires 1 F decoupling ceramic capacitors
C
IN
and C
OUT
(see Figure 4 on page 12). These capacitors should be placed as close as
possible to the corresponding pins.
The electrolytic capacitor C
VBUS
(see Figure 4) is required by the USB specification to
suppress the voltage and current transients caused by hot plugging/unplugging the
peripheral devices. This capacitor should be placed as close as possible to the USB
connector. The recommended value is 150 F, low ESR type is preferred.
If the V
IN
supply path is longer than approx. 150 mm, an additional capacitor is required to
be connected in parallel to the C
IN
to suppress V
IN
overvoltage transients caused by supply
path inductance and fast current changes. The minimum value is 10 F, low ESR type is
preferred.