LM3543M-H ,Triple Port USB Power Distribution Switch and Over-Current ProtectionApplicationsreduce power consumption in current overload conditions,thermal shutdown to prevent dev ..
LM3543M-L ,Triple Port USB Power Distribution Switch and Over-Current ProtectionFeaturesn 90mΩ (typ.) High-Side MOSFET SwitchThe LM3543 is a triple high-side power switch that is ..
LM3543MX-H ,Triple Port USB Power Distribution Switch and Over-Current ProtectionElectrical CharacteristicsLimits in standard typeface are for T = 25˚C, and limits in boldface type ..
LM3543MX-L ,Triple Port USB Power Distribution Switch and Over-Current ProtectionApplicationstions, and Bus-Powered USB Hubs can all be powered off an USB Root, Self-Powered, and B ..
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LM3544M-H ,Quad Port USB Power Distribution Switch and Over-Current ProtectionFeaturesn 90mΩ (typ.) High-Side MOSFET SwitchThe LM3544 is a quad high-side power switch that is an ..
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Triple Port USB Power Distribution Switch and Over-Current Protection
LM3543
Triple Port USB Power Distribution Switch and
Over-Current Protection
General DescriptionThe LM3543isa triple high-side power switch thatisan
excellent choice for usein Root, Self-Powered and
Bus-Powered USB (Universal Serial Bus) Hubs. Indepen-
dent port enables, flag signalsto alert USB controllersof
error conditions, controlled start-upin hot-plug events, and
short circuit protectionall satisfy USB requirements.
The LM3543 accepts input voltages between 2.7V and 5.5V.
The Enable logic inputs, availablein active-high and
active-low versions, canbe poweredoff any voltagein the
2.7Vto 5.5V range. The LM3543 limits the continuous
current througha single portto 1.25A (max.) whenitis
shortedto ground.
The low on-state resistanceofthe LM3543 switches ensures
the LM3543 will satisfy USB voltage drop requirements,
even when current througha switch reaches 500 mA. Thus,
High-Powered USB Functions, Low-Powered USB Func-
tions, and Bus-Powered USB Hubs canallbe poweredoffa
Rootor Self-Powered USB Hub containing the LM3543.
Added featuresof the LM3543 include current foldbackto
reduce power consumptionin current overload conditions,
thermal shutdownto prevent device failure caused by
high-current overheating, and undervoltage lockoutto keep
switches from operatingif the input voltageis below
acceptable levels.
Features 90mΩ (typ.) High-Side MOSFET Switch 500mA Continuous Current per Port7ms Fault Flag Delay Filters Hot-Plug Events Industry Standard Pin Order Short Circuit Protection with Power-Saving Current
Foldback Thermal Shutdown Protection Undervoltage Lockout RecognizedbyUL and Nemko Input Voltage Range: 2.7Vto 5.5V5μA Maximum Standby Supply Current 16-Pin SOIC Package Ambient Temperature Range: −40˚Cto 85˚C
Applications USB Root, Self-Powered, and Bus-Powered Hubs USB Devices suchas Monitors and Printers General Purpose High Side Switch Applications
10125832 10125833
Functional DiagramMarch 2001
LM3543
riple
Port
USB
Power
Distribution
Switch
and
Over-Current
Protection
