The LM3880 Simple Power Supply Sequencer offers the easiest method to control power up
sequencing and power down sequencing of multiple Independent voltage rails. By staggering the
startup sequence, it is possible to avoid latch conditions or large in-rush currents that can
affect the reliability of the system.
Available in a 6-pin SOT-23-6 package, the Simple Sequencer contains a precision enable
pin and three open-drain output flags. When the LM3880 is enabled, the three output flags will
sequentially release, after individual time delays, thus permitting the connected power supplies to
start up. The output flags will follow a reverse sequence during power down to avoid latch
EPROM capability allows every delay and sequence to be fully adjustable. Contact Texas
Instruments if a nonstandard configuration is required.
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