The AAT1138 is a 2A synchronous step-down converter with an integrated current-limiting load switch designed for precise input current control applications. By guarding against excessive input current, the AAT1138 enables the system designer to maximize the output current from the step-down converter while protecting the input supply. It is designed for protection of 5V USB ports and 3.3V supplies from heavy load transient conditions commonly seen with high data rate modem applications.