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MAX1946ETA

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19-2550; Rev 2; 3/07 Single USB Switch with Autoreset and Fault Blanking in Tiny TDFN The MAX1946 single current-limited switch with autoreset supplies a guaranteed 500mA load in accordance with USB specifications. The MAX1946 operates from a 2.7V to 5.5V input supply and consumes only 40µA of quiescent current when operating and only 3µA in shutdown. Selectable active-high/active-low control logic and shutdown control 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 MAX1946 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 shortcircuit conditions. An open-drain fault signal, (FAULT), notifies the microprocessor (µP) 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 faultblanking feature prevents fault signals from being issued when the device powers up the load. The MAX1946 is available in a space-saving 8-pin TDFN package and operates over the extended (-40°C to +85°C) temperature range. Applications Features ♦ Single USB Switch in 3mm x 3mm Package ♦ Autoreset Feature Saves System Power ♦ Guaranteed 500mA Load Current ♦ Built-In 20ms Fault-Blanking Circuitry ♦ Active-High or Active-Low Control Logic ♦ Fully Compliant to USB Specifications ♦ 2.7V to 5.5V Input Voltage Range ♦ Fault-Indicator Output ♦ Thermal-Overload Protection ♦ UL Certification Pending Ordering Information PART TEMP RANGE PINPACKAGE TOP MARK PKG CODE MAX1946ETA+ -40°C to +85°C 8 TDFN-EP* 3mm x 3mm ACQ T833-1 +Denotes a lead-free package. *EP = Exposed paddle. USB Ports and USB Hubs Notebook and Desktop Computers PDAs and Palmtop Computers Digital Cameras Docking Stations Typical Operating Circuit Pin Configuration INPUT 2.7V TO 5.5V TOP VIEW + GND 2 IN 8 SEL FAULT 1 MAX1946 FAULT IN 7 ON OUT 3 6 IN OUT 4 5 IN ACTIVE HIGH ACTIVE LOW SELECTABLE ON MAX1946 OUT OUT SEL GND TDFN ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 MAX1946 General Description

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