How to enable the output correctly on LTC2954 and when can it be asserted after power-up?

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Accepted Answer

The LTC2954 asserts its output when the PB input transitions from high to low. For EN to assert, PB must also be held low for the default debounce time plus the extended-on time configured using a capacitor in ONT (32ms + tONT). Additionally, the LTC2954 has a VUVL of 2.3V, meaning VIN should reach 2.3V before pulling PB low to initiate a valid pushbutton event. Also, note that the KILL pin needs to be pulled high 512ms after EN is asserted. 
 The PB can be pulled low after VCC reaches 2.3V which is the VUVL. But ADI recommends pulling PB low once VCC achieves steady state. Waiting 100ms gives it a good safety margin.

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LTC2954: FAQ