The UM9711/UM9711A is a low voltage, single N-MOSFET high-side power switch, optimized for self-powered and bus-powered Universal Serial Bus (USB) applications.

The UM9711/UM9711A is equipped with a charge pump circuitry to drive the internal MOSFET switch; the switch's low RDS(ON), 90mΩ, meets USB voltage drop requirements. The UM9711 provides a /FLG signal pin which is an N-Channel open drain MOSFET output. The flag output is available to indicate fault conditions to the local USB controller. The UM9711A doesn’t have such function.

Additional features include soft-start to limit inrush current during plug-in, thermal shutdown to prevent catastrophic switch failure from high-current loads, under-voltage lockout (UVLO) to ensure that the device remains off unless there is a valid input voltage present. The maximum current is limited to typically 2.5A in dual ports in accordance with the USB power requirements, lower quiescent current as 40μA making this device ideal for portable battery-operated equipment. The UM9711 is available in SOT23-5 and SOP8 packages requiring minimum board space and smallest components while the UM9711A is available in SOP8 package.

- Compliant to USB Specifications

- Built-in N-MOSFET, Typical RDS(ON): 90mΩ

- Output can be Forced Higher than Input (Off-State)

- Low Supply Current:

-- 40礎 Typical at Switch on State

-- 0.1礎 Typical at Switch off State

- Guaranteed 1.5A Continuous Load Current

- Wide Input Voltage Range: 2.5V to 5.5V

- Open-Drain Fault Flag Output (UM9711S, UM9711S8)

- Hot Plug-in Application (Soft-Start)

- 1.7V Typical Under-Voltage Lockout (UVLO)

- Current Limiting Protection

- Thermal Shutdown Protection

- Reverse Current Flow Blocking (No Body Diode)

- USB Bus/Self-Powered Hubs

- USB Peripherals

- ACPI Power Distribution

- PC Card Hot Swap

- Notebook, Motherboard PCs

- Battery-Powered Equipment

- Hot-Plug Power Supplies

- Battery-Charger Circuits