LM3525 Datasheet, PDF (1/17 Pages) National Semiconductor (TI) – Single Port USB Power Switch and Over-Current Protection

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
FEATURES
1
•2 Compatible with USB1.1 and USB 2.0
• 1 ms Fault Flag Delay During Hot-Plug Events
• Smooth Turn-On Eliminates Inrush Induced
Voltage Drop
• UL Recognized Component: REF # 205202
• 1A Nominal Short Circuit Output Current
Protects Notebook PC Power Supplies
• Thermal Shutdown Protects Device in Direct
Short Condition
• 500mA Minimum Continuous Load Current
• Small SOIC-8 Package Minimizes Board Space
• 2.7V to 5.5V Input Voltage Range
• Switch Resistance ≤ 120 mΩ Max. at V_IN = 5V
• 1µA Max Standby Current
• 100 µA Max Operating Current
• Undervoltage Lockout (UVLO)
DESCRIPTION
The LM3525 provides Universal Serial Bus standard
power switch and over-current protection for all host
port applications. The single port device is ideal for
Notebook PC and Handheld PC applications that
supply power to one port.
A 1 ms delay on fault flag output prevents erroneous
overcurrent reporting caused by inrush currents
during the hot-plug events.
The LM3525 accepts an input voltage between 2.7V
and 5.5V allowing use as a device-based inrush
current limiter for 3.3V USB peripherals, as well as
Root and Self-Powered Hubs at 5.5V. The Enable
input accepts both 3.3V and 5.0V logic thresholds.
The small size, low R_ON, and 1 ms fault flag delay
make the LM3525 a good choice for root hubs as well
as ganged power control in space-critical self-
powered hubs.
APPLICATIONS
• Universal Serial Bus (USB) Root Hubs
including Desktop and Notebook PC
• USB Monitor Hubs
• Other Self-Powered USB Hub Devices
• High Power USB Devices Requiring Inrush
Limiting
• General Purpose High Side Switch
Applications
Typical Operating Circuit and Connection Diagram
1
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2
PRODUCTION DATA information is current as of publication date.
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Instruments standard warranty. Production processing does not
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