Features: .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 mW Max. switch resistance
.1 µA Max. standby current
.200 µA Max. operating current
.Under-voltage lockout (UVLO)Application.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 In-rush Limiting
.General Purpose High Side Switch ApplicationsPinout
SpecificationsIf Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage −0.3V to 6V
Output Voltage −0.3V to 6V
Voltage at All Other Pins −0.3V to 5.5V
Power Dissipation (TA = 25°C)
(Note 2) 700 mW
TJMAX (Note 2)160°C
| Channels |
2 Channels |
| Switch On Resistance |
0.1 Ohm |
| Output Current |
500 mA |
| Input Min Voltage |
2.7 Volt |
| Input Max Voltage |
5.5 Volt |
| Quiescent Current |
0.001 mA |
| Enable Control |
Active Low, Active High |
| Temperature Min |
-40 deg C |
| Temperature Max |
125 deg C |
| RegType |
Switch |
| View Using Catalog |
DescriptionThe LM3526 provides Universal Serial Bus standard power switch and over-current protection for all host port applications.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 dissipating 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 RON, 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.
LM3526 Data Sheet
