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US203 Datasheet
The UTC US203 are low voltage cost-effective high-side power switches
with flag function. These devices are particularly suitable for self-powered
and bus-powered USB applications. The build-in N-MOSFET’s RDS(ON) which
meets the requirements of USB voltage drop is as low as 80mΩ.
The UTC US203 contains a charge pump circuitry to drive the internal
MOSFET switch and also incorporate such protection circuits: soft-start
circuit protect these devices from being damaged by limiting inrush current
during plug-in; thermal shutdown circuit is used to prevent catastrophic
switch failure from high-current loads. UVLO is used to ensure that the
device remains off unless there is a valid input voltage present.
A flag output is designed to indicate fault conditions to the local USB
controller. Fault current is limited to typically 2.5A for UTC US203AH/AL in
dual ports and 1A for UTC US203CH/CL in single port in accordance with the
USB power requirements, lower quiescent current as 25μA making this
device ideal for portable battery-operated equipment.
The UTC US203 are applied in USB Bus/Self powered hubs, USB
peripherals, NB, PCs, PC card hot swap, battery-powered equipment,
hot-plug power supplies, battery-charger circuits , ACPI power distribution.
* Input Voltage Varies From 2.5V to 5.5V
* Built-in N-MOSFET
* Output Can Be Forced Higher Than Input (Off-State)  
* Typical Low Supply Current:    - Switch On: 25μA (TYP)     - Switch Off: 1μA (TYP)
* Guaranteed Continuous Load Current: 1.5A for US203AH/AL and 0.6A for
* US203CH/CL
* Open-Drain Fault Flag Output To Indicate Fault Conditions
* Protection Circuits: - Soft-start( Hot plug-in application)   - UVLO 1.7V (TYP.)
 - Current Limiting Protection        - Thermal Shutdown Protection
* Reverse Current Flow Blocking (No Body Diode)

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