Features Compatible with USB1.1 and USB 2.0 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 mΩ Max. switch resistance 1 µA Max. standby current 200 µA Max. operating current Under-voltage lockout (UVLO) Description The 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. 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 In-rush Limiting General Purpose High Side Switch Applications

Also Recommended LM3525▲ Single Port USB Power Switch LM3544▲ Quad USB Power Switch LM3543▲ Triple USB Power Switch

Typical Application click for larger image	Connection Diagram click for larger image
Typical Performance click for larger image

Datasheets

Title		Size	Date	Other Language
	LM3526 Dual Port USB Power Switch and Over-current Protection	331 Kbytes	20-Oct-11	日本語

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM3526M-H/NOPB LM3526M-H RoHS Status	SOIC NARROW	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 3425 AVNET-EM Worldwide 169 BRITESTONE South Korea 10 DIGI-KEY Worldwide 1151 MOUSER Worldwide 157 NEWARK Americas 1793 RS COMPONENTS Worldwide 165 TAYLOR Americas 3425	$0.73 each at 1K+ pcs	rail of 95
LM3526M-L/NOPB LM3526M-L RoHS Status	SOIC NARROW	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 1 AVNET-EM Worldwide 2931 DIGI-KEY Worldwide 2116 MOUSER Worldwide 872 NEWARK Americas 66 RS COMPONENTS Worldwide 310 TAYLOR Americas 3801	$0.73 each at 1K+ pcs	rail of 95
LM3526MX-H/NOPB RoHS Status	SOIC NARROW	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 9278 AVNET-EM Worldwide 2485 CEAC Asia Pacific 2500 DIGI-KEY Worldwide 0 MOUSER Worldwide 1730 RSL MICRO Asia Pacific 5000 TAYLOR Americas 9278	$0.73 each at 1K+ pcs	reel of 2500
LM3526MX-L/NOPB LM3526MX-L RoHS Status	SOIC NARROW	Full production Lead Time: 6 weeks	Distributor Region Qty AITG Asia Pacific 1001 ARROW Worldwide 2035 AVNET-EM Worldwide 2500 DIGI-KEY Worldwide 0 MOUSER Worldwide 1808 TAYLOR Americas 2035 TECHMOSA Asia Pacific 15000	$0.73 each at 1K+ pcs	reel of 2500

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM3526.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM3526 is located at RoHS Status.

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM3526M-H/NOPB LM3526M-H	69.761 70.001	SOIC NARROW	8	1 1	260 235	Detail	Download	N/A	NSZXTT 3526 M-H
LM3526M-L/NOPB LM3526M-L	69.761 70.001	SOIC NARROW	8	1 1	260 235	Detail	Download	N/A	NSZXTT 3526 M-L
LM3526MX-H/NOPB	69.761 70.001	SOIC NARROW	8	1	260	Detail	Download	N/A	NSZXTT 3526 M-H
LM3526MX-L/NOPB LM3526MX-L	69.761 70.001	SOIC NARROW	8	1 1	260 235	Detail	Download	N/A	NSZXTT 3526 M-L

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM3526.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM3526 is located at RoHS Status.

CAD Symbols and Models Download LM3526 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM3526M-H	CS065	2	47473	43	0	5527000	1	1568301341
LM3526M-L	CS065	2	47473	43	0	5527000	1	1568301341
LM3526MX-H	CS065	2	47473	43	0	5527000	1	1568301341
LM3526MX-L	CS065	2	47473	43	0	5527000	1	1568301341

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM3526.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM3526 is located at RoHS Status.