ZHCSM96A November 2020 – August 2021 TPS6521835
PRODUCTION DATA
PGOOD_BU is a push-pull output indicating if DCDC5 and DCDC6 are in regulation. The output is driven to high when both rails are in regulation, and driven low if at least one of the rails is below the power-good threshold. The output-high level is equal to the output voltage of DCDC6.
PGOOD_BU is the logical and between PGOOD (DCDC5) and PGOOD (DCDC6), and has no delay time built-in. Unlike the main power-good, a fault on DCDC5 or DCDC6 does not trigger the power-down sequencer, does not disable any of the rails in the system, and has no effect on the PGOOD pin. DCDC5 and DCDC6 recover automatically once the fault is removed.
In this example, the power-down is triggered by a fault on DCDC3.