188.8.131.52. Multiple Supply Sequencer
If only simple power-up/power-down sequencing is required to follow the power sequencing considerations, a low-cost multiple supply sequencer IC can be used.
These devices offer multiple sequenced output enables that are controlled by a dedicated input. When the input is switched on, the Output Enables (EN1/ EN2 /EN3) turn on in successive order after a programmed time delay. This time delay between the output enables can be adjusted.
Figure 2. Example Schematic Design of Multiple Supply IC
Consult your power module vendor for more information about multiple supply sequencer ICs.