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LM3526

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SNVS054E –FEBRUARY 2000–REVISED MARCH 2013

LM3526 Dual Port USB Power Switch and Over-Current Protection

Check for Samples: LM3526

FEATURES

DESCRIPTION

The LM3526 provides Universal Serial Bus standard

• Compatible with USB1.1 and USB 2.0

power switch and over-current protection for all host

• 1 ms Fault Flag Delay Filters Hot-Plug Events

port applications. The dual port device is ideal for

• Smooth Turn-on Eliminates In-rush Induced

Notebook and desktop PC's that supply power to

Voltage Drop

more than one port.

• UL Recognized Component: REF# 205202

A 1 ms delay on the fault flag output prevents

erroneous overcurrent reporting caused by in-rush

• 1A Nominal Short Circuit Output Current

currents during hot-plug events.

Protects PC Power Supplies

• Thermal Shutdown Protects Device in Direct

The dual stage thermal protection circuit in the

Short Condition

LM3526 provides individual protection to each switch

and the entire device. In a short-circuit/over-current

• 500mA Minimum Continuous Load Current

event, the switch dissipating excessive heat is turned

• Small SOIC-8 package minimizes board space

off, allowing the second switch to continue to function

• 2.7V to 5.5V Input Voltage Range

uninterrupted.

• 140 mΩ Max. Switch Resistance

The LM3526 accepts an input voltage between 2.7V

• 1 µA Max. Standby Current

and 5.5V allowing use as a device-based in-rush

current limiter for 3.3V USB peripherals, as well as

• 200 µA Max. Operating Current

Root and Self-Powered Hubs at 5.5V. The Enable

• Under-voltage Lockout (UVLO)

inputs accept both 3.3V and 5.0V logic thresholds.

The small size, low R

, and 1 ms fault flag delay

APPLICATIONS

make the LM3526 a good choice for root hubs as well

• Universal Serial Bus (USB) Root Hubs

as per-port power control in embedded and stand-

including Desktop and Notebook PC

alone hubs.

• USB Monitor Hubs

• Other Self-Powered USB Hub Devices

• High Power USB Devices Requiring In-rush

Limiting

• General Purpose High Side Switch

Applications

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (18 pages)

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LM3526 www.ti.com SNVS054E – FEBRUARY 2000 – REVISED MARCH 2013 LM3526 Dual Port USB Power Switch and Over-Current Protection Check for Samples: LM3526 FEATURES 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. 1 2 • • • • • • • • • • Compatible with USB1.1 and USB 2.
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LM3526 SNVS054E – FEBRUARY 2000 – REVISED MARCH 2013 www.ti.com These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. Typical Operating Circuit and Connection Diagram Figure 1. LM3526-H Figure 2.
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LM3526 www.ti.com SNVS054E – FEBRUARY 2000 – REVISED MARCH 2013 Absolute Maximum Ratings (1) (2) −0.3V to 6V Supply Voltage −0.3V to 6V Output Voltage −0.3V to 5.5V Voltage at All Other Pins Power Dissipation (TA = 25°C) (3) TJMAX (1) 700 mW (3) 150°C Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Electrical specifications do not apply when operating the device beyond its rated operating conditions.
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LM3526 SNVS054E – FEBRUARY 2000 – REVISED MARCH 2013 www.ti.com DC Electrical Characteristics (continued) Limits in standard typeface are for TJ = 25°C, and limits in boldface type apply over the full operating temperature range. Unless otherwise specified: VIN = 5.0V, VEN = 0V (LM3526-L) or VEN = VIN (LM3526-H). Symbol IFH Parameter Conditions Error Flag Leakage Current Min Vflag = 5V Typ Max Units 0.
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LM3526 www.ti.com SNVS054E – FEBRUARY 2000 – REVISED MARCH 2013 Typical Performance Characteristics VIN = 5.0V, IL = 500 mA, TA = 25°C unless otherwise specified. RON vs Temperature RON vs Temperature Figure 4. Figure 5. Quiescent Current vs Input Voltage Quiescent Current vs Temperature Figure 6. Figure 7. Current Limit vs Output Voltage OC Threshold vs Temperature Figure 8. Figure 9.
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LM3526 SNVS054E – FEBRUARY 2000 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics (continued) VIN = 5.0V, IL = 500 mA, TA = 25°C unless otherwise specified. Fault Flag Delay vs Temperature Fault Flag Delay vs Temperature Figure 10. Figure 11. Under Voltage Lockout (UVLO) Under Voltage Lockout Threshold vs Temperature Figure 12. Figure 13.
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LM3526 www.ti.com SNVS054E – FEBRUARY 2000 – REVISED MARCH 2013 Typical Performance Characteristics (continued) VIN = 5.0V, IL = 500 mA, TA = 25°C unless otherwise specified. Turn-ON/OFF Response with 47Ω/10µF Load Turn-ON/OFF Response with 47Ω/150µF Load Figure 16. Figure 17. Thermal Shutdown Response (Port A output shorted*) Thermal Shutdown Response (See Notes) * Port A is shorted to GND through a 100 mΩ resistor Figure 18. Figure 19. Enable into a short Figure 20.
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LM3526 SNVS054E – FEBRUARY 2000 – REVISED MARCH 2013 www.ti.com FUNCTIONAL DESCRIPTION The LM3526-H and LM3526-L are high side P-Channel switches with active-high and active-low enable inputs, respectively. Fault conditions turn-off and inhibit turn-on of the output transistor and activate the open-drain error flag transistor sinking current to the ground. INPUT AND OUTPUT IN (Input) is the power supply connection to the control circuitry and the source of the output MOSFET.
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LM3526 www.ti.com SNVS054E – FEBRUARY 2000 – REVISED MARCH 2013 A 0.01 µF ceramic capacitor is recommended on each port directly between the Vbus and ground pins to prevent EMI damage to other components during the hot-detachment. Adequate capacitance must be connected to the input of the device to limit the input voltage drop during a hotplug event to less than 330 mV. For a few tens of µs, the host must supply the in-rush current to the peripheral, charging its bulk capacitance to Vbus.
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LM3526 SNVS054E – FEBRUARY 2000 – REVISED MARCH 2013 www.ti.com Figure 22. Self-Powered Hub Per-Port Voltage Drop Typical Applications Figure 23. Dual-Port USB Self-Powered Hub Figure 24.
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LM3526 www.ti.com SNVS054E – FEBRUARY 2000 – REVISED MARCH 2013 Figure 25.
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LM3526 SNVS054E – FEBRUARY 2000 – REVISED MARCH 2013 www.ti.com REVISION HISTORY Changes from Revision D (March 2013) to Revision E • 12 Page Changed layout of National Data Sheet to TI format ..........................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 (5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Device Marking for that device. (6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line.
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PACKAGE MATERIALS INFORMATION www.ti.com 21-Mar-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant LM3526MX-H/NOPB SOIC D 8 2500 330.0 12.4 6.5 5.4 2.0 8.0 12.0 Q1 LM3526MX-L SOIC D 8 2500 330.0 12.4 6.5 5.4 2.0 8.0 12.0 Q1 LM3526MX-L/NOPB SOIC D 8 2500 330.0 12.4 6.5 5.4 2.0 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 21-Mar-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM3526MX-H/NOPB SOIC D 8 2500 367.0 367.0 35.0 LM3526MX-L SOIC D 8 2500 367.0 367.0 35.0 LM3526MX-L/NOPB SOIC D 8 2500 367.0 367.0 35.
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