SLIS178B October 2017 – January 2018 TPS92830-Q1
The TPS92830-Q1 device has a FAULT bus for diagnostics output. It also supports a one-fails–all-fail function with other TPS92830-Q1, TPS9261x-Q1, TPS92630-Q1, or TPS92638-Q1 devices.
In normal operation, FAULT is weakly pulled up by internal pullup current source I(FAULT_pullup) to a voltage higher than VOH(FAULT). If any fault scenario occurs, the FAULT bus is strongly pulled low by internal pulldown current source I(FAULT_pulldown). Once V(FAULT) falls below VIL(FAULT) , all outputs are shut down for protection. The faulty channel keeps retrying until the fault condition is removed. The charge pump is shut down, and current consumption is also reduced to I(FAULT) to save quiescent current.
If FAULT̅ is externally pulled up with a current higher than I(FAULT_pulldown), the one-fails–all-fail function is disabled and only the faulty channel is turned off. The charge pump remains operating normally, and the device is in normal operation mode. The FAULT bus is able to support up to 15 pieces of TPS92830-Q1, TPS92630-Q1, TPS92638-Q1, or TPS9261x-Q1 devices.