MAX1838EEE ,Dual USB Switch with Fault Blanking and AutoresetELECTRICAL CHARACTERISTICS(V = V = 5V, ON = SEL = GND, ADJ_ = open, T = 0°C to +85°C, unless otherw ..
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MAX1838EEE
Dual USB Switch with Fault Blanking and Autoreset
General DescriptionThe MAX1838 is a dual, current-limited USB switch with
auxiliary input supply. Each switch meets all IEC speci-
fications for USB ports and is guaranteed to supply
500mA from either of two input supplies. A control pin
selects the power source from either the main or auxil-
iary supply.
The MAX1838 has multiple protection features, includ-
ing independent thermal-shutdown on each channel to
limit junction temperature in case of a prolonged short
or overload condition. The device has accurate internal
current-limit and reverse-current protection to safe-
guard the input supply against overload. When pow-
ered from the auxiliary supply, the current limit on each
channel is set independently with an external resistor.
An autoreset feature latches the switch off if the output
is shorted, thereby saving system power. When the
short is removed, the switch automatically turns back
on. Independent fault signals (FAULTAand FAULTB)
notify the microprocessor (µP) that the internal current
limit has been reached. A 20ms fault-blanking feature
prevents the MAX1838 from issuing false alarms to the
host during power-up or when hot-swapping into a
capacitive load.
The MAX1838 is available in a space-saving 16-pin
QSOP. For other USB current-limited switches, refer to
the MAX1693, MAX1694, MAX1812, and MAX1823.
ApplicationsDesktops
Notebook Computers
USB Ports
Docking Stations
FeaturesDual USB Switch with Auxiliary Input Autoreset from Fault ConditionGuaranteed 500mA Load per Channel Programmable Current Limits on Auxiliary InputsReverse Current ProtectionThermal Overload ProtectionBuilt-In 20ms Fault-Blanking 4V to 5.5V RangeIndependent FAULT Indicator OutputsUL Listing Pending
MAX1838
Dual USB Switch with Fault Blanking
and Autoreset
Pin Configuration
Ordering Information19-2033; Rev 0; 4/01
MAX1838
Dual USB Switch with Fault Blanking
and Autoreset
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VIN__= VAUX__= 5V, ON= SEL = GND, ADJ_ = open, TA
= 0°C to +85°C, unless otherwise noted. Typical values are at TA=
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_, AUX_, ON, OUT_, SEL, FAULT_,
ADJ_ to GND.........................................................-0.3V to +6V
IN_, AUX_ to OUTA_; IN_, AUX_ to OUTB_.................-6V to +6V
AUX_ to IN_.................................................................-6V to +6V
Maximum Continuous Switch Current
(per channel, internally limited).............................................1.2A
FAULT_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
MAX1838
Dual USB Switch with Fault Blanking
and Autoreset
ELECTRICAL CHARACTERISTICS (continued)(VIN__= VAUX__= 5V, ON= SEL = GND, ADJ_ = open, TA
= 0°C to +85°C, unless otherwise noted. Typical values are at TA=
ELECTRICAL CHARACTERISTICS
MAX1838
Dual USB Switch with Fault Blanking
and Autoreset
ELECTRICAL CHARACTERISTICS (continued)
Note 1:SEL delay includes both make and break delay. The host system should wait for at least this interval before turning off the
appropriate input supply.
Note 2:Specifications from 0°C to -40°C are guaranteed by design, not production tested.
MAX1838
Dual USB Switch with Fault Blanking
and Autoreset3145
AUX QUIESCENT CURRENT vs. VAUXMAX1838 toc01
VAUX (V)
AUX QUIESCENT CURRENT (3145
IN QUIESCENT CURRENT vs. VAUXMAX1838 toc02
VAUX (V)
IN QUIESCENT CURRENT (
IN + AUX QUIESCENT CURRENT
vs. TEMPERATURE
MAX1838 toc03
TEMPERATURE (°C)
QUIESCENT CURRENT (
IN + AUX QUIESCENT CURRENT
vs. TEMPERATURE
MAX1838 toc04
TEMPERATURE (°C)
QUIESCENT CURRENT (
MAX1838 toc05
TEMPERATURE (°C)
SHUTDOWN CURRENT (
IN + AUX QUIESCENT SHUTDOWN CURRENT
vs. TEMPERATURETEMPERATURE (°C)
SWITCH LEAKAGE CURRENT (nA)
MAX1838 toc06
SWITCH LEAKAGE CURRENT
vs. TEMPERATURE, FULL DATAMAX1838 toc07
TEMPERATURE (°C)
NORMALIZED ON-RESISTANCE (
NORMALIZED SWITCH ON-RESISTANCE
vs. TEMPERATUREMAX1838 toc08
TEMPERATURE (°C)
CONTINUOUS CURRENT LIMIT THRESHOLD (A)
CONTINUOUS CURRENT LIMIT THRESHOLD
vs. TEMPERATURE
TURN-ON DELAY vs. TEMPERATURE
MAX1838 toc09
TEMPERATURE (°C)
TURN-ON DELAY (ms)
Typical Operating Characteristics(Circuit of Figure 2, VIN_= 5V, TA= +25°C, unless otherwise noted.)
MAX1838
Dual USB Switch with Fault Blanking
and Autoresetypical Operating Characteristics (continued)(Circuit of Figure 2, VIN_= 5V, TA= +25°C, unless otherwise noted.)
