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 m 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 LM3543▲ Triple USB Power Switch LM3544▲ Quad USB Power Switch MY BRIEFCASE                                       Click any "Briefcase" icon to add an item

Datasheets

Title		Size	Date	Other Language
	LM3526 Dual Port USB Power Switch and Over-Current Protection	749 Kbytes	7-Apr-05	日本語

More Application Notes

Title		Size	Date	Other Language
	AN-292: Application Note 292 Applications of the LM3524 Pulse-Width-Modulator	239 Kbytes	3-Oct-02
	AN-715: Application Note 715 LM385 Feedback Provides Regulator Isolation	50 Kbytes	3-Oct-02
	AN-1823: Application Note 1823 LM3528 Evaluation Board	869 Kbytes	4-Aug-08
	AN-272: Application Note 272 Op Amp Booster Designs	382 Kbytes	2-Oct-02
	AN-288: Application Note 288 System-Oriented DC-DC Conversion Techniques	405 Kbytes	3-Oct-02
	AN-293: Application Note 293 Control Applications of CMOS DACs	385 Kbytes	4-Oct-04
	AN-694: Application Note 694 A DMOS 3A, 55V, H-Bridge: The LMD18200	408 Kbytes	26-Sep-02	日本語

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Standard Pack Size
LM3526M-H/NOPB LM3526M-H RoHS Status	SOIC NARROW	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 395 AVNET-EM Worldwide 8735 BRITESTONE South Korea 10 DIGIKEY Worldwide 2619 FUTURE Worldwide 1100 KEIKONG Asia Pacific 737 NEWARK Americas 1144 RS COMPONENTS Worldwide 165	$0.90 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 90 AVNET-EM Worldwide 2269 DIGIKEY Worldwide 4273 FUTURE Worldwide 1100 NEWARK Americas 628 RS COMPONENTS Worldwide 310	$0.90 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 12398 AVNET-EM Worldwide 2500 DIGIKEY Worldwide 0 FUTURE Worldwide 1100 KEIKONG Asia Pacific 5000	$0.90 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 7500 DIGIKEY Worldwide 0 FUTURE Worldwide 1100 TECHMOSA Asia Pacific 15000	$0.90 each at 1K+ pcs	reel of 2500

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

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

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

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

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

National's certificate of product compliance 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	38968	52	0	4402000	1	1249079519
LM3526M-L	CS065	2	38968	52	0	4402000	1	1249079519
LM3526MX-H	CS065	2	38968	52	0	4402000	1	1249079519
LM3526MX-L	CS065	2	38968	52	0	4402000	1	1249079519

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/packaging/leadfree.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

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