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Maxim USB switch features autoreset, fault blanking

Posted: 04 Oct 2002 ?? ?Print Version ?Bookmark and Share

Keywords:maxim integrated products? max1940? usb switch? universal serial bus?

The MAX1940 triple current-limited switch from Maxim Integrated Products features an autoreset and fault blanking function for USB applications and is available in a 16-pin SSOP casing that makes it suitable for use in notebook computers, desktop computers, and PDAs.

The 20ms fault-blanking feature that enables the circuit to ignore momentary faults, such as those caused when hot-swapping a capacitive load, preventing false alarms to the host system. It also prevents fault signals from being issued when the device powers up the load.

The autoreset feature automatically restarts the output after the short circuit or overload condition is removed.

Each channel is guaranteed to supply 500mA and meets all USB specifications. For applications that require additional supply current for a peripheral device, the MAX1940 can supply a minimum of 700mA.

The MAX1940 also provides several safety features to protect the USB port including a built-in thermal protection that turns off the switch when the die temperature exceeds 160C. A current limiter protects the input supply against both overload and short-circuit conditions, while an independent open-drain fault signals notify the microprocessor when a thermal overload, current-limit, undervoltage lockout, or short-circuit fault occurs.

When all switches are enabled, the device consumes 60?A and drops to 3?A when they are off. The MAX1940 is specified for the extended-industrial temperature range and is priced at $1.25 each in 1,000-up units.

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