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MAX1946：Single USB Switch with Autoreset and Fault Blanking in Tiny TDFN

Smallest Single USB Switch with Autoreset and Fault Blanking in Tiny TDFN Package

The MAX1946 single current-limited switch with auto-reset 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 short-circuit conditions. An open-drain fault signal, (active-low 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 fault-blanking feature prevents fault signals from being issued when the device powers up the load. The MAX1946 is available in a space-saving 8-pin (3mm x 3mm) TDFN package and operates over the extended (-40°C to +85°C) temperature range.

Key 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

MAX1946: Typical Operating Circuit Applications/Uses Digital Cameras Docking Stations Notebook and Desktop Computers PDAs and Palmtop Computers USB Ports and USB Hubs

DataSheet

Parametrics

Quality and Environmental Data

• MAX1946.pdf

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