MAXIM MAX1940EEE

The MAX1940 triple current-limited USB power switch provides three independent switches, each with its own enable-control input and fault indicator. A logic input sets the active polarity of the enable control inputs. The fault indicators notify the system when the current-limit, short-circuit, undervoltage lockout, or thermal-shutdown threshold is exceeded. The MAX1940 operates from a 4V to 5.5V input supply and supplies a minimum output current of 700mA per channel. A built-in current limit of 0.9A (typ) limits the output current in the event of an overload condition. Built-in short-circuit detection pulses the output current if the output voltage falls below 1V, resulting in lower RMS output current and reduced pow

• The MAX1940 triple current-limited switch with autoreset supplies a guaranteed 500mA load per channel in accordance with USB specifications.
• The MAX1940 operates from a 4V to 5.5V input supply and consumes only 60μA of quiescent current when operating and only 3μA in standby.
• Selectable active-high/active-low control logic and independent shutdown controls for each channel 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.
• 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.
• Independent open-drain fault signals (FAULTA, FAULTB, and FAULTC) 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 MAX1940 is available in a space-saving 16-pin QSOP package and operates over the extended (-40°C to +85°C) temperature range.
• Triple USB Switch in Tiny 16-Pin QSOP Package
• Autoreset Feature Saves System Power
• Guaranteed 500mA Load Current per Channel
• Built-In 20ms Fault-Blanking Circuitry
• Active-High/Active-Low Control Logic
• Fully Compliant to USB Specifications
• 4V to 5.5V Input Voltage Range
• Independent Shutdown Control
• Independent Fault Indicator Outputs
• Thermal-Overload Protection
• 3μA Standby Current