LM3526M-L National Semiconductor, LM3526M-L Datasheet

LM3526M-L

Manufacturer Part Number

LM3526M-L

Description

Special Function IC

Manufacturer

National Semiconductor

Datasheets

1.LM3526M-L.pdf (12 pages)

2.LM3526M-L.pdf (11 pages)

Specifications of LM3526M-L

Peak Reflow Compatible (260 C)

Leaded Process Compatible

Mounting Type

Surface Mount

Package / Case

8-SOIC

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

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Download datasheet (750Kb)

LM3526

Dual Port USB Power Switch and Over-Current

Protection

General Description

The LM3526 provides Universal Serial Bus standard power

switch and over-current protection for all host port applica-

tions. 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 dis-

sipating 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 R

LM3526 a good choice for root hubs as well as per-port

power control in embedded and stand-alone hubs.

Typical Operating Circuit and Connection Diagram

, and 1 ms fault flag delay make the

DS101097

10109701

Features

n Compatible with USB1.1 and USB 2.0

n 1 ms fault flag delay filters Hot-Plug events

n Smooth turn-on eliminates in-rush induced voltage drop

n UL recognized component: REF# 205202

n 1A nominal short circuit output current protects PC

n Thermal shutdown protects device in direct short

n 500mA minimum continuous load current

n Small SO-8 package minimizes board space

n 2.7V to 5.5V input voltage range

n 140 mΩ Max. switch resistance

n 1 µA Max. standby current

n 200 µA Max. operating current

n Under-voltage lockout (UVLO)

Applications

n Universal Serial Bus (USB) Root Hubs including

n USB Monitor Hubs

n Other Self-Powered USB Hub Devices

n High Power USB Devices Requiring In-rush Limiting

n General Purpose High Side Switch Applications

power supplies

condition

Desktop and Notebook PC

LM3526-H

LM3526-L

10109702

10109740

10109728

www.national.com

March 2005

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