LM3526

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SNVS054E – FEBRUARY 2000 – REVISED MARCH 2013

LM3526 Dual Port USB Power Switch and Over-Current Protection

Check for Samples: LM3526

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FEATURES

DESCRIPTION

The LM3526 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 Filters Hot-Plug Events

port applications. The dual port device is ideal for

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Smooth Turn-on Eliminates In-rush Induced

Notebook and desktop PC's that supply power to

Voltage Drop

more than one port.

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UL Recognized Component: REF# 205202

A 1 ms delay on the fault flag output prevents

erroneous overcurrent reporting caused by in-rush

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1A Nominal Short Circuit Output Current

currents during hot-plug events.

Protects PC Power Supplies

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Thermal Shutdown Protects Device in Direct

The dual stage thermal protection circuit in the

Short Condition

LM3526 provides individual protection to each switch

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

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500mA Minimum Continuous Load Current

event, the switch dissipating excessive heat is turned

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Small SOIC-8 package minimizes board space

off, allowing the second switch to continue to function

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2.7V to 5.5V Input Voltage Range

uninterrupted.

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140 m

Ω Max. Switch Resistance

The LM3526 accepts an input voltage between 2.7V

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1 µA Max. Standby Current

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

current limiter for 3.3V USB peripherals, as well as

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200 µA Max. Operating Current

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

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Under-voltage Lockout (UVLO)

inputs accept both 3.3V and 5.0V logic thresholds.

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

APPLICATIONS

make the LM3526 a good choice for root hubs as well

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Universal Serial Bus (USB) Root Hubs

as per-port power control in embedded and stand-

including Desktop and Notebook PC

alone hubs.

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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 In-rush

Limiting

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General Purpose High Side Switch

Applications

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Products conform to specifications per the terms of the Texas

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