參數(shù)資料
型號: LM3526-L
廠商: National Semiconductor Corporation
元件分類: 基準電壓源/電流源
英文描述: Dual Port USB Power Switch and Over-Current Protection
中文描述: 雙端口USB電源開關和過電流保護
文件頁數(shù): 1/11頁
文件大?。?/td> 323K
代理商: LM3526-L
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 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
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
power supplies
n
Thermal shutdown protects device in direct short
condition
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 m
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
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
DS101097-1
DS101097-2
LM3526-H
DS101097-40
DS101097-28
LM3526-L
February 2000
L
2000 National Semiconductor Corporation
DS101097
www.national.com
相關PDF資料
PDF描述
LM3526-H Dual Port USB Power Switch and Over-Current Protection
LM3526 Dual Port USB Power Switch and Over-Current Protection
LM3543MX-H Triple Port USB Power Distribution Switch and Over-Current Protection
LM3543M-L Triple Port USB Power Distribution Switch and Over-Current Protection
LM3543M-H Triple Port USB Power Distribution Switch and Over-Current Protection
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