LM3525

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SNVS051D – FEBRUARY 2000 – REVISED MARCH 2013

LM3525 Single Port USB Power Switch and Over-Current Protection

Check for Samples: LM3525

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FEATURES

DESCRIPTION

The LM3525 provides Universal Serial Bus standard

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Compatible with USB1.1 and USB 2.0

power switch and over-current protection for all host

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1 ms Fault Flag Delay During Hot-Plug Events

port applications. The single port device is ideal for

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Smooth Turn-On Eliminates Inrush Induced

Notebook PC and Handheld PC applications that

Voltage Drop

supply power to one port.

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UL Recognized Component: REF # 205202

A 1 ms delay on fault flag output prevents erroneous

overcurrent reporting caused by inrush currents

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1A Nominal Short Circuit Output Current

during the hot-plug events.

Protects Notebook PC Power Supplies

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Thermal Shutdown Protects Device in Direct

The LM3525 accepts an input voltage between 2.7V

Short Condition

and 5.5V allowing use as a device-based inrush

current limiter for 3.3V USB peripherals, as well as

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500mA Minimum Continuous Load Current

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

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Small SOIC-8 Package Minimizes Board Space

input accepts both 3.3V and 5.0V logic thresholds.

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2.7V to 5.5V Input Voltage Range

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Switch Resistance

make the LM3525 a good choice for root hubs as well

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1µA Max Standby Current

as ganged power control in space-critical self-

powered hubs.

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100 µA Max Operating Current

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Undervoltage Lockout (UVLO)

APPLICATIONS

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Universal Serial Bus (USB) Root Hubs

including Desktop and Notebook PC

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USB Monitor Hubs

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Other Self-Powered USB Hub Devices

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High Power USB Devices Requiring Inrush

Limiting

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General Purpose High Side Switch

Applications

Typical Operating Circuit and Connection Diagram

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Products conform to specifications per the terms of the Texas

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