General Description

The MAX1946 single current-limited switch with autoreset supplies a guaranteed 500mA load in accordance with USB specifications. The MAX1946 operates from a 2.7V to 5.5V input supply and consumes only 40µA of quiescent current when operating and only 3µA in shutdown. Selectable active-high/active-low control logic and shutdown control provide additional flexibility. An autoreset feature latches the switch off in the event of a short circuit, saving system power. The switch reactivates upon removal of the shorted condition.

Features

♦ Single USB Switch in 3mm x 3mm Package

♦ Autoreset Feature Saves System Power

♦ Guaranteed 500mA Load Current

♦ Built-In 20ms Fault-Blanking Circuitry

♦ Active-High or Active-Low Control Logic

♦ Fully Compliant to USB Specifications

♦ 2.7V to 5.5V Input Voltage Range

♦ Fault-Indicator Output

♦ Thermal-Overload Protection

Applications

    USB Ports and USB Hubs

    Notebook and Desktop Computers

    PDAs and Palmtop Computers

    Digital Cameras

    Docking Stations