LM3526MX-H National Semiconductor, LM3526MX-H Datasheet

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LM3526MX-H

Manufacturer Part Number
LM3526MX-H
Description
Manufacturer
National Semiconductor
Datasheet

Specifications of LM3526MX-H

Usb Power Switch Type
High Side Switch
Short Circuit Current Limit
2.2A
Input Voltage Range
2.7 to 5.5V
Number Of Switches
Dual
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
8
Package Type
SOIC N
Lead Free Status / Rohs Status
Not Compliant

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© 2005 National Semiconductor Corporation
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
ON
, 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

Related parts for LM3526MX-H

LM3526MX-H Summary of contents

Page 1

... ON 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 © 2005 National Semiconductor Corporation Features n Compatible with USB1.1 and USB 2 fault flag delay filters Hot-Plug events n Smooth turn-on eliminates in-rush induced voltage drop ...

Page 2

... Ordering Information Part Number LM3526M-H Active High Enable, 95 units per rail LM3526M-L Active Low Enable, 95 units per rail LM3526MX-H Active High Enable, 2500 units per reel LM3526MX-L Active Low Enable, 2500 units per reel www.national.com Enable, Delivery Option 2 Package Type SO-8, ...

Page 3

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage Output Voltage Voltage at All Other Pins Power Dissipation (T = 25˚C) A (Note 2) T (Note 2) JMAX Operating Ratings Supply Voltage Range ...

Page 4

AC Electrical Characteristics Limits in standard typeface are for T less otherwise specified 5.0V. IN Symbol Parameter t OUT Rise Time r t OUT Fall Time f t Turn on Delay OUT ON t Turn off ...

Page 5

Typical Performance Characteristics V = 5.0V 500 mA 25˚C unless otherwise specified Temperature ON Quiescent Current vs Input Voltage Current Limit vs Output Voltage 10109704 Quiescent Current vs Temperature 10109706 OC ...

Page 6

Typical Performance Characteristics specified. (Continued) Fault Flag Delay vs Temperature Under Voltage Lockout (UVLO) Over Current/Current Limit Response* * Output is shorted to Ground through a 100 mΩ resistor www.national.com V = 5.0V 500 mA ...

Page 7

Typical Performance Characteristics specified. (Continued) Turn-ON/OFF Response with 47Ω/10µF Load Thermal Shutdown Response (Port A output shorted*) * Port A is shorted to GND through a 100 mΩ resistor Enable into a short V = 5.0V 500 mA, ...

Page 8

Functional Description The LM3526-H and LM3526-L are high side P-Channel switches with active-high and active-low enable inputs, re- spectively. Fault conditions turn-off and inhibit turn-on of the output transistor and activate the open-drain error flag tran- sistor sinking current to ...

Page 9

Application Information PCB LAYOUT CONSIDERATIONS In order to meet the USB requirements for voltage drop, droop and EMI, each component used in this circuit must be evaluated for its contribution to the circuit performance. The PCB layout rules and guidelines ...

Page 10

Typical Applications FIGURE 4. Soft-Start Application (Single port shown) www.national.com FIGURE 3. Dual-Port USB Self-Powered Hub 10 10109725 10109726 ...

Page 11

Typical Applications (Continued) FIGURE 5. In-rush Current-limit Application 11 10109727 www.national.com ...

Page 12

... BANNED SUBSTANCE COMPLIANCE National Semiconductor manufactures products and uses packing materials that meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. ...

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