Texas Instruments LM3526M, LM3526M-H, LM3526M-L, LM3526MX, LM3526MX-H Schematic [ru]

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LM3526

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LM3526 Dual Port USB Power Switch and Over-Current Protection

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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 SOIC-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)

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

SNVS054E –FEBRUARY 2000–REVISED MARCH 2013

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 standalone hubs.

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.

LM3526

SNVS054E –FEBRUARY 2000–REVISED MARCH 2013

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

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Figure 1. LM3526-H

Figure 2. LM3526-L

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LM3526

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Absolute Maximum Ratings

(1)(2)

SNVS054E –FEBRUARY 2000–REVISED MARCH 2013

Supply Voltage −0.3V to 6V Output Voltage −0.3V to 6V Voltage at All Other Pins −0.3V to 5.5V Power Dissipation (TA= 25°C)

(3)

JMAX

(3)

700 mW

150°C

(1) 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.

(2) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/Distributors for availability and

specifications.

(3) The maximum power dissipation must be derated at elevated temperatures and is dictated by T

(junction to ambient thermal resistance), and TA(ambient temperature). The maximum allowable power dissipation at any

temperature is P

DMAX

= (T

− TA)/θJAor the number given in the Absolute Maximum Ratings, which ever is lower. θJA= 150°C/W.

JMAX

(Maximum junction temperature),

JMAX

Operating Ratings

Supply Voltage Range 2.7V to 5.5V Operating Ambient Range −40°C to 85°C Operating Junction Temperature Range −40°C to 125°C Storage Temperature Range −65°C to +150°C Lead Temperature (Soldering, 5 seconds) 260°C ESD Rating ESD Rating Output Only 8kV

(1) The human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin. Enable pin ESD threshold is 1.7kV.

(1)

2kV

DC Electrical Characteristics

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 Parameter Conditions Min Typ Max Units

OUT

OC I

LEAK

UVLO

DDOFF

DDON

THRESH

On Resistance mΩ

VIN= 5V, I VIN= 2.7V, I

OUT pins continuous output Each Output 0.5 A current

Short Circuit Output Current Each Output (enable into Load)

= 4.0V 0.5 1.2 1.9

OUT

= 0.1V 1 1.5

OUT

Over-current Threshold 2.2 3.2 A OUT pins Output Leakage VEN= VIN(LM3526-L) 0.01 10 µA

Current VEN= 0V (LM3526-H)

IFO= 10 mA, VIN= 5.0V 10 25

FLAG Output Resistance IFO= 10 mA, VIN= 3.3V 11 35 Ω

IFO= 10 mA, VIN= 2.7V 12 40 EN/EN Leakage Current VEN/VEN= 0V or VEN/VEN= V EN/EN Input Logic High See EN/EN Input Logic Low See

(2) (2)

Under-Voltage Lockout 1.8 V Threshold

Supply Current Switch-Off 0.2 1 µA

−40°C ≤ TJ≤ 85°C 2 Supply Current Switch-On 115 200 µA Over-temperature Shutdown TJIncreasing, with no shorted output 150 °C

Threshold TJIncreasing, with shorted output (s) 145

TJDecreasing

= 500mA, each switch 100 140

OUT

= 500mA, each switch 110 180

OUT

(1)

−0.5 0.5 µA

2.4 1.9 V

1.7 0.8 V

(1)

135

(1) Thermal Shutdown will protect the device from permanent damage. (2) For LM3526-L, OFF is EN ≥ 2.4V and ON is EN ≤ 0.8V. For LM3526-H, OFF is EN ≤ 0.8V and ON is EN ≥ 2.4V.

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LM3526

SNVS054E –FEBRUARY 2000–REVISED MARCH 2013

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DC Electrical Characteristics (continued)

Symbol Parameter Conditions Min Typ Max Units

Error Flag Leakage Current V

= 5V 0.01 1 µA

flag

AC Electrical Characteristics

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.

Symbol Parameter Conditions Min Typ Max Units

t t t t t

r f ON OFF OC

OUT Rise Time RL= 10Ω 100 µs OUT Fall Time RL= 10Ω 5 µs Turn on Delay, EN to OUT RL= 10Ω 150 µs Turn off Delay, EN to OUT RL= 10Ω 5 µs Over Current Flag Delay RL= 0 1 ms

TYPICAL APPLICATION CIRCUIT

PIN DESCRIPTIONS

Pin Number Pin Name Pin Function

1, 4 ENA, ENB Enable (Input): Logic-compatible enable inputs.

2, 3 FLAG A Fault Flag (Output): Active-low, open-drain outputs. Indicates overcurrent, UVLO or thermal shutdown.

6 GND Ground 7 IN Supply Input: This pin is the input to the power switch and the supply voltage for the IC.

8, 5 OUT A Switch Output: These pins are the outputs of the high side switch.

(LM3526-L)

ENA, ENB

(LM3526-H)

FLAG B *See Application Information for more information.

OUT B

Figure 3. Typical Application Circuit

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LM3526

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SNVS054E –FEBRUARY 2000–REVISED MARCH 2013

Typical Performance Characteristics

VIN= 5.0V, IL= 500 mA, TA= 25°C unless otherwise specified.

vs vs

Temperature Temperature

Figure 4. Figure 5.

Quiescent Current Quiescent Current

vs vs

Input Voltage Temperature

Figure 6. Figure 7.

Current Limit OC Threshold

vs vs

Output Voltage Temperature

Figure 8. Figure 9.

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LM3526

SNVS054E –FEBRUARY 2000–REVISED MARCH 2013

Typical Performance Characteristics (continued)

VIN= 5.0V, IL= 500 mA, TA= 25°C unless otherwise specified.

Fault Flag Delay Fault Flag Delay

vs vs

Temperature Temperature

Figure 10. Figure 11.

Under Voltage Lockout (UVLO) Temperature

Under Voltage Lockout Threshold

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Figure 12. Figure 13.

Over Current/Current Limit Response* Thermal Cycling*

* Output is shorted to Ground through a 100 mΩ resistor

Figure 14. Figure 15.

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Short Circuit Response with

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