1FEATURES

2• Compatible with USB1.1 and USB 2.0

• 1 ms Fault Flag Delay During Hot-Plug Events

• Smooth Turn-On Eliminates Inrush Induced

Voltage Drop

• UL Recognized Component: REF # 205202

• 1A Nominal Short Circuit Output Current

Protects Notebook 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

• Switch Resistance ≤ 120 mΩ Max. at VIN = 5V

• 1μA Max Standby Current self•

100 μA Max Operating Current

• Undervoltage Lockout (UVLO)

APPLICATIONS

• Universal Serial Bus (USB) Root Hubs

including Desktop and Notebook PC

• USB Monitor Hubs

• Other Self-Powered USB Hub Devices

• High Power USB Devices Requiring Inrush

Limiting

• General Purpose High Side Switch

Applications

DESCRIPTION

The LM3525 provides Universal Serial Bus standard

power switch and over-current protection for all host

port applications. The single port device is ideal for

Notebook PC and Handheld PC applications that

supply power to one port.

A 1 ms delay on fault flag output prevents erroneous

overcurrent reporting caused by inrush currents

during the hot-plug events.

The LM3525 accepts an input voltage between 2.7V

and 5.5V allowing use as a device-based inrush

current limiter for 3.3V USB peripherals, as well as

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

input accepts both 3.3V and 5.0V logic thresholds.

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

make the LM3525 a good choice for root hubs as well

as ganged power control in space-critical self•

powered hubs.