The TPS255x and TPS255x-1 power-distribution switches
are intended for applications where precision current limiting is required or heavy
capacitive loads and short circuits are encountered and provide up to 1.5 A of continuous load
current. These devices offer a programmable current-limit threshold between 75 mA and 1.7 A (typical)
through an external resistor. Current-limit accuracy as tight as ±6% can be achieved at the higher
current-limit settings. The power-switch rise and fall times are controlled to minimize current
surges during turnon and turnoff.
TPS255x devices limit the
output current to a safe level by using a constant-current mode when the output load exceeds the
current-limit threshold. TPS255x-1 devices provide circuit breaker
functionality by latching off the power switch during overcurrent or reverse-voltage
situations. An internal reverse-voltage comparator disables the power-switch when the output
voltage is driven higher than the input to protect devices on the input side of the switch. The
FAULT output asserts low during overcurrent and reverse-voltage conditions.
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