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MAX1940EEE
Triple USB Switch with Autoreset and Fault Blanking
General DescriptionThe MAX1940 triple current-limited switch with auto-
reset 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 con-
trol logic and independent shutdown controls for each
channel provide additional flexibility. An autoreset fea-
ture latches the switch off in the event of a short circuit,
saving system power. The switch reactivates upon
removal of the shorted condition.
The MAX1940 provides several safety features to pro-
tect the USB port. Built-in thermal-overload protection
turns off the switch when the die temperature exceeds
+160°C. Accurate internal current-limiting circuitry pro-
tects the input supply against both overload and short-
circuit conditions. Independent open-drain fault signals
(FAULTA, FAULTB, and FAULTC) notify the micro-
processor when a thermal-overload, current-limit,
undervoltage lockout (UVLO), or short-circuit fault
occurs. A 20ms fault-blanking feature enables the cir-
cuit 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.
Applications
FeaturesTriple USB Switch in Tiny 16-Pin QSOP PackageAutoreset Feature Saves System PowerGuaranteed 500mA Load Current per ChannelBuilt-In 20ms Fault-Blanking CircuitryActive-High/Active-Low Control LogicFully Compliant to USB Specifications4V to 5.5V Input Voltage RangeIndependent Shutdown ControlIndependent Fault Indicator OutputsThermal-Overload Protection3µA Standby CurrentUL Certification Pending
MAX1940riple USB Switch with Autoreset and
Fault Blanking
Typical Operating Circuit
Ordering Information19-2497; Rev 0; 7/02
Pin ConfigurationUSB Ports
USB Hubs
Notebook Computers
Desktop Computers
PDAs and Palmtop
Computers
Docking Stations
MAX1940
Triple USB Switch with Autoreset and
Fault Blanking
ABSOLUTE MAXIMUM RATINGSStresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
IN_, ON_, OUT_, SEL, FAULT_, to GND...................-0.3V to +6V
IN1, IN2 to OUTA......................................................-0.3V to +6V
IN2, IN3 to OUTB......................................................-0.3V to +6V
IN4, IN5 to OUTC.....................................................-0.3V to +6V
OUT_ Continuous Switch Current
(per channel, internally limited).........................................1.4A
FAULT_DC Current............................................................20mA
Continuous Power Dissipation (TA= +70°C)
16-Pin QSOP (derate 8.3mW/°C above +70°C)...........667mW
Operating Temperature Range...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
ELECTRICAL CHARACTERISTICS
MAX1940riple USB Switch with Autoreset and
Fault Blanking
ELECTRICAL CHARACTERISTICS (continued)(VIN_= 5V, CIN_= 0.1µF, COUT_= 1µF, TA
= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
ELECTRICAL CHARACTERISTICS(VIN_= 5V, CIN_= 0.1µF, COUT_= 1µF, TA
= -40°C to +85°C, unless otherwise noted.) (Note 2)
Note 1:Short-circuit detect threshold is the output voltage at which the device transitions from short-circuit current limit to
continuous current limit.
MAX1940
Triple USB Switch with Autoreset and
Fault Blanking
Typical Operating Characteristics(Circuit of Figure2, VIN_= 5V, CIN_= 0.1µF, COUT_= 1µF, ON_ = SEL, TA= +25°C, unless otherwise noted.)
MAX1940riple USB Switch with Autoreset and
Fault Blanking
Typical Operating Characteristics (continued)(Circuit of Figure2, VIN_= 5V, CIN_= 0.1µF, COUT_= 1µF, ON_ = SEL, TA= +25°C, unless otherwise noted.)
MAX1940
Triple USB Switch with Autoreset and
Fault Blanking
Typical Operating Characteristics (continued)(Circuit of Figure2, VIN_= 5V, CIN_= 0.1µF, COUT_= 1µF, ON_ = SEL, TA= +25°C, unless otherwise noted.)