TPS3895: Error in datasheet of TPS389x series

Michele,

I just double checked the formula and derived it from the provided EC table values and I believe the equation to be correct. Please see derivation below:

charging capacitor is defined by: I = C * dv/dt where I is the capacitor charge current in Amperes, C is capacitor value in Farads, dv is the capacitor charge voltage in Volts, and dt is the delay in seconds.

using the EC table,

I = 310 nA
dv = 1.238 V

this provides delay = C * 1.238 / 310x10^-9 and when you put C in units of microfarad, this equals delay = C * 3.99 which matches the delay equation.

Note: you must also add the delay with no capacitor since this is inherent to the device. The final delay equation is written as

delay in seconds = (C [in uF] * 4 ) + 40us

Please let me know if anything is unclear. Thanks!

-Michael