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LM3525M-H/NOPB Datasheet

Download or read online National Semiconductor LM3525M-H/NOPB IC USB POWER SWITCH 8-SOIC pdf datasheet.



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LM3525
Single Port USB Power Switch and Over-Current
Protection
General Description
The LM3525 provides Universal Serial Bus standard power
switch and over-current protection for all host port applica-
tions. 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 over-
current 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
, and 1 ms fault flag delay make the
ON
LM3525 a good choice for root hubs as well as ganged
power control in space-critical self-powered hubs.
Typical Operating Circuit and Connection Diagram
© 2005 National Semiconductor Corporation
Features
n Compatible with USB1.1 and USB 2.0
n 1 ms Fault Flag Delay During Hot-Plug Events
n Smooth Turn-On Eliminates Inrush Induced Voltage
Drop
n UL Recognized Component: REF # 205202
n 1A Nominal Short Circuit Output Current Protects
Notebook 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 Switch Resistance ≤ 120 mΩ Max. at V
n 1µA Max Standby Current
n 100 µA Max Operating Current
n Undervoltage 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 Inrush Limiting
n General Purpose High Side Switch Applications
10105501
DS101055
March 2005
= 5V
IN
10105502
LM3525M-L
10105531
10105530
LM3525M-H
www.national.com
Specifications of National Semiconductor LM3525M-H/NOPB
Current Limit:
1A
Internal Switch(s):
Yes
Mounting Type:
Surface Mount
Number Of Outputs:
1
Operating Temperature:
-40°C ~ 85°C
Package / Case:
8-SOIC (3.9mm Width)
Rds (on):
120 mOhm
Series:
-
Type:
USB Switch
Voltage - Input:
2.7 ~ 5.5 V
Other Names:
*LM3525M-H, *LM3525M-H/NOPB, LM3525M-H

Summary of Contents

Page 1

... 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 Inrush Limiting n General Purpose High Side Switch Applications 10105501 DS101055 March 2005 5V IN 10105502 LM3525M-L 10105531 10105530 LM3525M-H www.national.com ...

Page 2

... Ordering Information Part Number LM3525M-H LM3525M-L LM3525MX-H LM3525MX-L www.national.com Enable, Delivery Option Active High Enable, 95 units per rail Active Low Enable, 95 units per rail Active High Enable, 2500 units per reel Active Low Enable, 2500 units per reel 2 Package Type SO-8, NS Package ...

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 25C) A (Note 2) T (Note 2) JMAX DC Electrical Characteristics Limits in standard typeface are for T less otherwise specified ...

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 25C unless otherwise specified. RDS Current Limit vs Temperature RDS 10105504 Over Current Threshold vs Temperature 10105506 5 vs Temperature ON ...

Page 6

Typical Performance Characteristics specified. (Continued) Delay vs Temperature Short Circuit Response Turn-ON/OFF Delay and Rise Time/Fall Time www.national.com V 5.0V 500 mA UVLO Threshold 10105508 Under Voltage Lock Out (UVLO) 10105510 Short Circuit Current ...

Page 7

Functional Description The LM3525-H and LM3525-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 ...

Page 8

Application Information Place the switch as close to the USB connector as pos- sible. Keep all V traces as short as possible and use at bus least 50-mil, 1 ounce copper for all V plating the traces will reduce ...

Page 9

Typical Applications FIGURE 3. SIngle-Port USB Self-Powered Hub FIGURE 4. Soft-Start Application FIGURE 5. Inrush Current-limit Application 9 10105525 10105526 10105527 www.national.com ...

Page 10

... 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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