MAX1931EUB ,Current-Limited Switch for Single USB PortELECTRICAL CHARACTERISTICS(V = 5V, T = 0°C to +85°C, unless otherwise noted. Typical values are at ..
MAX1931EUB ,Current-Limited Switch for Single USB PortApplicationsON 5 6 GNDUSB Ports and Hubsµ MAXNotebook ComputersPortable EquipmentDocking StationsTy ..
MAX1931EUB ,Current-Limited Switch for Single USB Portapplications. The MAX1931 operates withinputs from 2.7V to 5.5V, making it ideal for both 3V and T ..
MAX1931EUB+ ,Current-Limited Switch for Single USB PortFeaturesThe MAX1931 is a current-limited, 60mΩ switch with♦ 0.5A Guaranteed Output Currentbuilt-in ..
MAX1931EUB+ ,Current-Limited Switch for Single USB PortELECTRICAL CHARACTERISTICS(V = 5V, T = 0°C to +85°C, unless otherwise noted. Typical values are at ..
MAX1931EUB+T ,Current-Limited Switch for Single USB PortApplicationsON 5 6 GNDUSB Ports and HubsμMAXNotebook ComputersPortable EquipmentDocking StationsTyp ..
MAX489ECSD+ ,±15kV ESD-Protected, Slew-Rate-Limited, Low-Power, RS-485/RS-422 TransceiversApplications:MAX491E, and MAX1487E are low-power transceivers forMAX3430: ±80V Fault-Protected, Fai ..
MAX489ECSD+T ,±15kV ESD-Protected, Slew-Rate-Limited, Low-Power, RS-485/RS-422 TransceiversELECTRICAL CHARACTERISTICS(V = 5V ±5%, T = T to T , unless otherwise noted.) (Notes 1, 2)CC A MIN M ..
MAX489EEPD ,15kV ESD-Protected / Slew-Rate-Limited / Low-Power / RS-485/RS-422 Transceiversapplications that are not ESD sen-MAX481ECPA 0°C to +70°C 8 Plastic DIPsitive see the pin- and func ..
MAX489EEPD ,15kV ESD-Protected / Slew-Rate-Limited / Low-Power / RS-485/RS-422 TransceiversELECTRICAL CHARACTERISTICS(V = 5V ±5%, T = T to T , unless otherwise noted.) (Notes 1, 2)CC A MIN M ..
MAX489EEPD+ ,±15kV ESD-Protected, Slew-Rate-Limited, Low-Power, RS-485/RS-422 TransceiversApplicationsPART TEMP RANGE PIN-PACKAGELow-Power RS-485 TransceiversMAX481ECPA 0°C to +70°C 8 Plast ..
MAX489EESD ,【15kV ESD-Protected, Slew-Rate-Limited, Low-Power, RS-485/RS-422 TransceiversMAX481E/MAX483E/MAX485E/MAX487E–MAX491E/MAX1487E19-0410; Rev 3; 7/96±15kV ESD-Protected, Slew-Rate- ..
MAX1931EUB
Current-Limited Switch for Single USB Port
General DescriptionThe MAX1931 is a current-limited, 60mΩswitch with
built-in fault blanking. Its accurate preset current limit of
0.64A to 1.06A makes it ideally suited for USB applica-
tions. The device’s low quiescent supply current (14µA)
and shutdown current (1µA) conserve battery power in
portable applications. The MAX1931 operates with
inputs from 2.7V to 5.5V, making it ideal for both 3V and
5V systems.
A fault signal notifies the microprocessor that the inter-
nal current limit has been reached. A 10ms fault-blank-
ing feature allows momentary faults (such as those
caused when hot-swapping into a capacitive load) to be
ignored, thus preventing false alarms to the host system.
This fault blanking also prevents a fault signal from
being issued when the device is powering up.
In the MAX1931, an output overcurrent condition causes
the switch to current limit at 0.64A to 1.06A and FAULT
to go low after the 10ms blanking period. When the
overcurrent condition is removed, FAULTreturns to its
high-impedance state.
The MAX1931 has several safety features to ensure that
the USB port is protected. Built-in thermal overload
protection limits power dissipation and junction tempera-
tures. The device has an accurate internal current-limit-
ing circuitry to protect the input supply against overload.
The MAX1931 is available in a space-saving 10-pin
µMAX package.
ApplicationsUSB Ports and Hubs
Notebook Computers
Portable Equipment
Docking Stations
Hot Plug-In Power Supplies
Battery-Charger Circuits
Features0.5A Guaranteed Output CurrentGuaranteed 0.75A Short-Circuit Protection10ms Internal Fault-Blanking TimeoutNo Fault Signal During Power-UpThermal Shutdown Protection2.7V to 5.5V Supply Range14µA Supply CurrentSmall 10-Pin µMAX Package
MAX1931
Current-Limited Switch for Single USB Port
Typical Operating Circuit19-2357; Rev 0; 4/02
Pin Configuration
Ordering Information
MAX1931
Current-Limited Switch for Single USB Port
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VIN= 5V, TA
= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
Stresses 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(ON), FAULTto GND....................................-0.3V to +6V
OUT to GND................................................-0.3V to (VIN+ 0.3V)
Maximum Continuous Switch Current.....1.2A (internally limited)
OUT Short Circuit to GND..........................................Continuous
Continuous Power Dissipation (TA= +70°C)
10-Pin µMAX (derate 5.6mW/°C above +70°C)............444mW
Operating Temperature Range............................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
MAX1931
Current-Limited Switch for Single USB Port
ELECTRICAL CHARACTERISTICS(VIN= 5V, TA
= -40°C to +85°C, unless otherwise noted.) (Note 1)
Note 1:Specifications to -40°C are guaranteed by design, not production tested.
MAX1931
Current-Limited Switch for Single USB Port
Typical Operating Characteristics(VIN= 5V, TA= +25°C, unless otherwise noted.)
Current-Limited Switch for Single USB Port
Typical Operating Characteristics (continued)(VIN= 5V, TA= +25°C, unless otherwise noted.)
MAX1931
Current-Limited Switch for Single USB Port
_______________Detailed DescriptionThe MAX1931 P-channel MOSFET power switch limits
output current to 0.64A (min) to 1.06A (max). When the
output current is increased beyond the current limit
(ILIMIT), the current also increases through the replica
switch (IOUT / 6500). The current-limit error amplifier
compares the voltage to the internal 1.24V reference
and regulates the current back to the ILIMIT.
This switch is not bidirectional; therefore, the input volt-
age must be higher than the output voltage.
Continuous Short-Circuit ProtectionThe MAX1931 is a foldback short-circuit-protected
switch. In the event of an output short-circuit or current-
overload condition, the current through the switch is
foldback-current-limited to 500mA continuous.
Thermal ShutdownThe MAX1931 features thermal shutdown. The switch
turns off and the FAULToutput goes low immediately
(no fault blanking) when the junction temperature
exceeds +165°C. When the MAX1931 cools 20°C, the
switch turns back on. If the fault short-circuit condition
is not removed, the switch cycles on and off, resulting
in a pulsed output.
FAULT IndicatorThe MAX1931 provides a fault output (FAULT). A
100kΩpullup resistor from FAULTto IN provides a
logic control signal. This open-drain output goes low
when any of the following conditions occur: The input voltage is below the undervoltage lockout
(UVLO) threshold.The die temperature exceeds the thermal shutdown
temperature limit of +165°C.The device is in current limit and the 10ms fault-
blanking period is exceeded.
Fault Blanking The MAX1931 features 10ms fault blanking. Fault
blanking allows current-limit faults, including momen-
tary short-circuit faults that occur when hot-swapping a
capacitive load, and also ensures that no fault is issued
during power-up. When a load transient causes the
device to enter current limit, an internal counter starts. If
the load fault persists beyond the 10ms fault-blanking
timeout, the FAULToutput asserts low. Ensure that the
MAX1931’s input is adequately bypassed to prevent
input glitches from triggering spurious FAULToutputs.
Input voltage glitches less than 150mV do not cause a
Pin Description
