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MAX1940：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.

Key Features 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

MAX1940: Typical Operating Circuit Applications/Uses Computers: Desktop, Workstation, Server Docking Stations Notebook Computers PDAs and Palmtop Computers USB Hubs USB Ports

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Related Products

• MAX1823：Dual USB Switch with Fault Blanking and Autoreset
• MAX1812：Dual USB Switch with Fault Blanking

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