The TPS4022 device provides many sequencing options. Using the ON_OFF_CONFIG command, each rail can be configured to start up whenever the input is not in undervoltage lockout or to additionally require a signal on the CNTLx pin and/or receive an update to the OPERATION command via the PMBus interface.

When the gating signal as specified by ON_OFF_CONFIG is reached for that rail, a programmable turn-on delay can be set with TON_DELAY. The rise time can be programmed with TON_RISE. When the specified signal(s) are set to turn the output off, a programmable turn-off delay set by TOFF_DELAY is used before switching is inhibited. More information can be found in the PMBus command descriptions.

When the output voltage reaches the PGOOD threshold after the start-up period, the PGOOD pin is asserted. This pin can be connected to the CNTL pin of another rail in dual-output mode or on another device to control turn-on and turn-off sequencing.