AAT4612 Datasheet, PDF (6/10 Pages) Advanced Analogic Technologies – Current Limited Load Switch

Functional Block Diagram
AAT4612
Current Limited Load Switch
IN
Under-Voltage
Lockout
Over-Temp
Protection
Current
Limit
ON
GND
OUT
Functional Description
The AAT4612 is a single channel current limited
load switch that protects against short circuits by
current limiting to a preset level. A patented fast
acting current limit loop limits the current in a frac-
tion of a micro second and instantly resets to low
impedance once the short circuit condition is
removed. The AAT4612 is internally protected
from thermal damage by an over temperature
detection circuit. If the die temperature reaches the
internal thermal limit, the power device is switched
off until the die temperature cools to a level below
the thermal limit threshold. The device will thermal
cycle indefinitely until the over current condition is
removed. The AAT4612 operates with input volt-
ages ranging from 2.4V to 5.5V which, along with
its extremely low operating current, makes it ideal
for battery-powered applications. In cases where
the input voltage drops below 2.4V, the AAT4612
MOSFET is protected from entering the saturated
region of operation by being automatically shut
down by an under voltage lockout circuit.
The AAT4612 is ideally suited for protection of
peripheral ports such as USB, RS232 and parallel
ports.
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