App note: Tracking/Sequence for point-of-load DC/DC converters


Another app note (PDF) for power sequencing from Murata

Whereas in the old days, one master switch simultaneously turned on the power for all parts of a system, many modern systems require multiple supply voltages for different on-board sections. Typically the CPU or microcontroller needs 1.8 Volts or lower. Memory (particularly DDR) may use 1.8 to 2.5 Volts. Interface “glue” and “chipset” logic might use +3.3Vdc power while Input/Output subsystems may need +5V. Finally, peripherals use 5V and/or 12V.

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