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Maxim USB switch features autoreset, fault blanking

Posted: 06 Sep 2002 ?? ?Print Version ?Bookmark and Share

Keywords:maxim integrated products? max1946? usb switch? universal serial bus?

The MAX1946 current-limited USB switch from Maxim Integrated Products features autoreset and fault blanking functions, to provide protection to USB application used in notebook and desktop PCs, and PDAs.

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

Housed in a 3-by-3mm QFN package, the device delivers 500mA and is claimed to meet all USB specifications. For applications where a peripheral device requires additional supply current, MAX1946 supplies a minimum of 700mA.

The IC operates from an input voltage range of 2.7V to 5.5V, allowing it to be used in both 3V and 5V systems. Quiescent current is 40?A in the on state and drops to 3?A when switch is off.

Other protection features include thermal overload and current-limiting features. Independent open-drain fault signals notify the microprocessor when a thermal overload, current-limit, undervoltage lockout, or short circuit fault occurs.

The MAX1946 is screened for the extended-industrial temperature range and is priced starting 58 cents each in 1,000-up quantities.

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