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UM9711

90mΩ, 1.5A High-Side Power Switches with Flag

UM9711S SOT23-5

UM9711S8 SOP8

UM9711AS8 SOP8

General Description

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

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.

Applications

Features



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



Compliant to USB Specifications





Output can be Forced Higher than Input

(Off-State)



Low Supply Current :

40µA Typical at Switch on State

0.1µA Typical at Switch off State



Guaranteed 1.5A Continuous Load Current



Wide Input Voltage Ranges : 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)