Adjustable, active-low, constant-current, current-limited power-distribution switch

The TPS2550/51 power-distribution

switch is intended for applications where heavy capacitive loads and short-circuits

are likely to be encountered, incorporating a 100-mΩ, N-channel MOSFET in a single

package. The current-limit threshold is user adjustable between 100 mA and 1.1 A via

an external resistor. The power-switch rise and fall times are controlled to

minimize current surges during switching.

The device limits the output current

to a desired level by switching into a constant-current mode when the output load

exceeds the current-limit threshold or a short is present. An internal

reverse-voltage detection comparator disables the power-switch in the event that the

output voltage is driven higher than the input to protect devices on the input side

of the switch. The FAULT logic output asserts low during both

overcurrent and reverse-voltage conditions.