Does the LT4363 require a decoupling capacitor on VCC for correct / reliable operation?
Some of the application circuits in the datasheet show a 0.1uF capacitor on the VCC pin, whereas others do not.
Thanks for the help
The 0.1uF capacitor at input is not mandatory . However if the input voltage can spike to few 100V as is common in automotive environments ,these spikes need to be clamped below the abs max. of LTC4363 input pin voltage. This can be done by adding an RC filter at the input. A 0.1uF bypass capacitor with a 1 kohm resistor , high voltage transients upto 200V with pulse width less than 10usec are filtered out.
Another method to clamp these surges is to use a resistor and zener diode at Vcc pin. Refer Datasheet Pg 16 for more details.