Triple USB Switch with Autoreset and Fault Blanking

The MAX1940 triple current-limited switch with auto-reset supplies a guaranteed 500mA load per channel in accordance with USB specifications. The MAX1940 operates from a 4V to 5.5V input supply and consumes only 60µA of quiescent current when operating and only 3µA in standby. Selectable active-high/active-low control logic and independent shutdown controls for each channel 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.

The MAX1940 provides several safety features to protect the USB port. Built-in thermal-overload protection turns off the switch when the die temperature exceeds +160°C. Accurate internal current-limiting circuitry protects the input supply against both overload and short-circuit conditions. Independent open-drain fault signals (active-low FAULTA, active-low FAULTB, and active-low FAULTC) notify the microprocessor when a thermal-overload, current-limit, undervoltage lockout (UVLO), or short-circuit fault occurs. A 20ms fault-blanking feature enables the circuit to ignore momentary faults, such as those caused when hot-swapping a capacitive load, preventing false alarms to the host system. The fault-blanking feature also prevents fault signals from being issued when the device powers up the load.

The MAX1940 is available in a space-saving 16-pin QSOP package and operates over the extended (-40°C to +85°C) temperature range.

Applications

* Computers: Desktop, Workstation, Server * Docking Stations * Notebook Computers * PDAs and Palmtop Computers * USB Hubs * USB Ports

* Triple USB Switch in Tiny 16-Pin QSOP Package

* Autoreset Feature Saves System Power

* Guaranteed 500mA Load Current per Channel

* Built-In 20ms Fault-Blanking Circuitry

* Active-High/Active-Low Control Logic

* Fully Compliant to USB Specifications

* 4V to 5.5V Input Voltage Range

* Independent Shutdown Control

* Independent Fault Indicator Outputs

* Thermal-Overload Protection

* 3µA Standby Current