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LM3526MX-L Datasheet

  • LM3526MX-L

  • Dual Port USB Power Switch and Over-Current Protection

  • 11頁(yè)

  • NSC

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LM3526 Dual Port USB Power Switch and Over-Current Protection
February 2000
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鈥檚 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 pro-
vides individual protection to each switch and the entire de-
vice. In a short-circuit/over-current event, the switch dissipat-
ing 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
ON
, 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 stand-alone hubs.
Features
n
n
n
n
n
n
n
n
n
n
n
n
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 SO-8 package minimizes board space
2.7V to 5.5V input voltage range
140 m鈩?Max. switch resistance
1 碌A(chǔ) Max. standby current
200 碌A(chǔ) Max. operating current
Under-voltage lockout (UVLO)
Applications
n
Universal Serial Bus (USB) Root Hubs including
Desktop and Notebook PC
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
Typical Operating Circuit and Connection Diagram
DS101097-2
LM3526-H
DS101097-1
DS101097-40
DS101097-28
LM3526-L
漏 2000 National Semiconductor Corporation
DS101097
www.national.com

LM3526MX-L 產(chǎn)品屬性

  • National Semiconductor (TI)

  • Reel

  • 2500

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