1FEATURES

2• Compatible with USB1.1 and USB 2.0

• 1 ms Fault Flag Delay Filters Hot-Plug Events

• Smooth Turn-on Eliminates In-rush Induced

Voltage Drop

• UL Recognized Component: REF# 205202

• 1A Nominal Short Circuit Output Current

Protects PC Power Supplies

• Thermal Shutdown Protects Device in Direct

Short Condition

• 500mA Minimum Continuous Load Current

• Small SOIC-8 package minimizes board space

• 2.7V to 5.5V Input Voltage Range

• 140 mΩ Max. Switch Resistance

• 1 μA Max. Standby Current

• 200 μA Max. Operating Current

• Under-voltage Lockout (UVLO)

APPLICATIONS

• Universal Serial Bus (USB) Root Hubs standincluding

Desktop and Notebook PC

• USB Monitor Hubs

• Other Self-Powered USB Hub Devices

• High Power USB Devices Requiring In-rush

Limiting

• General Purpose High Side Switch

Applications

DESCRIPTION

The LM3526 provides Universal Serial Bus standard

power switch and over-current protection for all host

port applications. The dual port device is ideal for

Notebook and desktop PC's that supply power to

more than one port.

A 1 ms delay on the fault flag output prevents

erroneous overcurrent reporting caused by in-rush

currents during hot-plug events.

The dual stage thermal protection circuit in the

LM3526 provides individual protection to each switch

and the entire device. In a short-circuit/over-current

event, the switch dissipating excessive heat is turned

off, allowing the second switch to continue to function

uninterrupted.

The LM3526 accepts an input voltage between 2.7V

and 5.5V allowing use as a device-based in-rush

current limiter for 3.3V USB peripherals, as well as

Root and Self-Powered Hubs at 5.5V. The Enable

inputs accept both 3.3V and 5.0V logic thresholds.

The small size, low RON, and 1 ms fault flag delay

make the LM3526 a good choice for root hubs as well

as per-port power control in embedded and standincluding

alone hubs.