Product category: Power Supply ICs and Controllers
News Release from: Maxim Integrated Products | Subject: MAX1946
Edited by the Electronicstalk Editorial Team on 09 September 2002
USB switch shrinks but still protects
The MAX1946 is a 500mA single current-limited switch in a 3 x 3mm QFN package with autoreset and fault blanking for universal serial bus (USB) applications.
The MAX1946 is a 500mA single current-limited switch in a 3 x 3mm QFN package with autoreset and fault blanking for universal serial bus (USB) applications used in notebook computers, desktop computers and PDAs The MAX1946 delivers a guaranteed 500mA and meets all USB specifications
This article was originally published on Electronicstalk on 27 Aug 2002 at 8.00am (UK)
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For applications where a peripheral device requires additional supply current, MAX1946 supplies a minimum of 700mA.
The MAX1946 input voltage ranges from 2.7 to 5.5V, for use in both 3 and 5V systems.
The MAX1946 is 40% smaller than competitors' parts that come in a 3 x 5mm MSOP.
The MAX1946 provides several safety features to protect the USB port.
Built-in thermal protection turns off the switch when the die temperature exceeds +160C.
Accurate current limiting protects the input supply from 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 is a low 40uA in the on state and drops to only 3uA when switch is off.
Thermal overload protection automatically limits power dissipation and junction temperature to safe levels.
The MAX1946 comes in a tiny 8-pin 3 x 3mm QFN package.
The part is screened for the extended-industrial temperature range (-40 to +85C).
Prices start at $0.58 (1000-up, FOB USA).
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