Product category: Power Supply ICs and Controllers
News Release from: Maxim Integrated Products | Subject: MAX1940
Edited by the Electronicstalk Editorial Team on 07 October 2002
Triple USB switch saves space and power
The MAX1940 is a triple current-limited switch with autoreset and fault blanking for universal serial bus applications.
The MAX1940 is a triple current-limited switch with autoreset and fault blanking for universal serial bus (USB) applications Its small 16-pin SSOP package makes it ideal for notebook computers, desktop computers, and PDAs
This article was originally published on Electronicstalk on 27 Aug 2002 at 8.00am (UK)
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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 provides several safety features to protect the USB port.
Built-in thermal protection turns off the switch when the die temperature exceeds 160C.
Accurate internal current limiting protects the input supply against both overload and short-circuit conditions.
Independent open-drain fault signals 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 autoreset feature automatically restarts the output after the short-circuit or overload condition is removed.
Quiescent current when all switches are enabled is a low 60uA, and drops to only 3uA when the switches are off.
Thermal overload protection automatically limits power dissipation and junction temperature to safe levels.
The MAX1940 is screened for the extended-industrial temperature range (-40 to +85C).
Prices start at $1.25 (1000-up, FOB USA).
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