General Description

The MAX1838 is a dual, current-limited USB switch with auxiliary input supply. Each switch meets all IEC specifications for USB ports and is guaranteed to supply 500mA from either of two input supplies. A control pin selects the power source from either the main or auxiliary supply.

The MAX1838 has multiple protection features, including independent thermal-shutdown on each channel to limit junction temperature in case of a prolonged short or overload condition. The device has accurate internal current-limit and reverse-current protection to safe guard the input supply against overload. When powered from the auxiliary supply, the current limit on each channel is set independently with an external resistor.

The MAX1838 is available in a space-saving 16-pin QSOP. For other USB current-limited switches, refer to the MAX1693, MAX1694, MAX1812, and MAX1823.

Features

♦ Dual USB Switch with Auxiliary Input

♦ Autoreset from Fault Condition

♦ Guaranteed 500mA Load per Channel

♦ Programmable Current Limits on Auxiliary Inputs

♦ Reverse Current Protection

♦ Thermal Overload Protection

♦ Built-In 20ms Fault-Blanking

♦ 4V to 5.5V Range

♦ Independent FAULT Indicator Outputs

Applications

   Desktops

   Notebook Computers

   USB Ports

   Docking Stations