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LM3543
Datasheet (National Semiconductor)
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Datasheet LM3543 Datasheet (National Semiconductor)

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Page 1
LM3543 Triple Port USB Power Distribution Switch and Over-Current Protection
LM3543 Triple Port USB Power Distribution Switch and Over-Current Protection
June 2005

General Description

The LM3543 is a triple high-side power switch that is an excellent choice for use in Root, Self-Powered and Bus­Powered USB (Universal Serial Bus) Hubs. Independent port enables, flag signals to alert USB controllers of error conditions, controlled start-up in hot-plug events, and short circuit protection all satisfy USB requirements.
The LM3543 accepts input voltages between 2.7V and 5.5V. The Enable logic inputs, available in active-high and active­low versions, can be powered off any voltage in the 2.7V to
5.5V range. The LM3543 limits the continuous current through a single port to 1.25A (max.) when it is shorted to ground.
The low on-state resistance of the LM3543 switches ensures the LM3543 will satisfy USB voltage drop requirements, even when current through a switch reaches 500 mA. Thus, High-Powered USB Functions, Low-Powered USB Func­tions, and Bus-Powered USB Hubs can all be powered off a Root or Self-Powered USB Hub containing the LM3543.
Added features of the LM3543 include current foldback to reduce power consumption in current overload conditions, thermal shutdown to prevent device failure caused by high­current overheating, and undervoltage lockout to keep switches from operating if the input voltage is below accept­able levels.

Features

n Compatible with USB1.1 and USB 2.0 n 90mΩ (typ.) High-Side MOSFET Switch n 500mA Continuous Current per Port n 7 ms Fault Flag Delay Filters Hot-Plug Events n Industry Standard Pin Order n Short Circuit Protection with Power-Saving Current
Foldback
n Thermal Shutdown Protection n Undervoltage Lockout n Recognized by UL and Nemko n Input Voltage Range: 2.7V to 5.5V n 5 µA Maximum Standby Supply Current n 16-Pin SOIC Package n Ambient Temperature Range: −40˚C to 85˚C

Applications

n USB Root, Self-Powered, and Bus-Powered Hubs n USB Devices such as Monitors and Printers n General Purpose High Side Switch Applications
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10125833

Functional Diagram

10125801
© 2005 National Semiconductor Corporation DS101258 www.national.com
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Connection Diagrams

LM3543
LM3543-H
16-Pin SOIC
LM3543-L
16-Pin SOIC
Top View
10125802

Ordering Information

Part Number Enable, Delivery Option Package Type
LM3543M-H Active High Enable
LM3543M-L Active Low Enable
LM3543MX-H Active High Enable, 2500 units per reel
LM3543MX-L Active Low Enable, 2500 units per reel

Typical Application Circuit

Top View
10125829
SO-16
NS Package Number M16A

FIGURE 1. The LM3543 used in a Self-Powered or Root USB Hub

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10125804
Page 3
LM3543

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/
Lead Temperature Range (Soldering, 5 sec.) 260˚C
ESD Rating (Note 3) 2 kV
Distributors for availability and specifications.
Voltage at IN
Voltage at EN pins
Power Dissipation (Note 2) Internally Limited
and OUTXpins −0.3V to 6V
X
(ENX) and FLAG
X
X
−0.3V to 5.5V

Operating Ratings

Supply Voltage Range 2.7V to 5.5V
Continuous Output Current Range (Each Output) 0 mA to 500 mA
Maximum Junction Temperature 150˚C
Junction Temperature Range −40˚C to 125˚C
Storage Temperature Range −65˚C to 150˚C

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: V
Symbol Parameter Conditions Min Typ Max Units
R
I
ON
OUT
On Resistance
OUTXContinuous Output Current
I
LEAK-OUT
I
SC
OUTXLeakage Current ENX= 0 (ENX=VIN);
OUTXShort-Circuit Current (Note 4)
OC
THRESH
V
L_FLAG
I
LEAK-FLAG
I
LEAK-EN
V
IH
V
IL
V
UVLO
I
DDON
I
DDOFF
Note 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.
Note 2: The maximum allowable power dissipation is a function of the Maximum Junction Temperature (T the Ambient Temperature (T at any temperature is P thermal shutdown.
Note 3: The Human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin.
Note 4: Thermal Shutdown will protect the device from permanent damage.
Overcurrent Threshold 2.0 3.2 A
FLAGXOutput-Low Voltage I(FLAGX)=10mA 0.1 0.3 V
FLAGXLeakage Current 2.7 ≤ V
ENxInput Leakage Current ENx/ENx=0Vor
EN/EN Input Logic High 2.7V ≤ VIN≤ 5.5V 2.4 V
EN/EN Input Logic Low 4.5V ≤ VIN≤ 5.5V 0.8 V
Under-Voltage Lockout Threshold
Operational Supply Current
Shutdown Supply Current
MAX
= 5.0V, ENX=VIN(LM3543-H) or ENX= 0V (LM3543-L).
IN
V
IN
V
IN
= 5V, I
= 3.3V, I
= 0.5A 90 125
OUTX
OUTX
3.0V ≤ VIN≤ 5.5V 0.5 A
TJ= 25˚C
EN
= 0 (ENX=VIN);
X
−40≤ TJ≤ 85˚C
OUTXConnected to GND 0.8 1.25 A
≤ 5.5V 0.2 1 µA
FLAG
ENx/ENx=V
2.7V ≤ V
EN
x=VIN
IN
≤ 4.5V 0.4
IN
(ENx=0);
TJ= 25˚C
EN
x=VIN
(ENx=0);
−40˚C ≤ TJ≤ 125˚C
= 0 (ENx=VIN);
EN
x
TJ= 25˚C
−40˚C ≤ T
). The LM3543 in the 16-pin SOIC package has a T
A
=(T
)/θJA. Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the part will go into
JMAX−TA
≤ 125˚C 5 µA
J
of 150˚C and a θJAof 130˚C/W. The maximum allowable power dissipation
JMAX
= 0.5A 95 130
0.01 1 µA
10 µA
−0.5 0.5 µA
1.8 V
375 600 µA
800 µA
1µA
), Junction to Ambient Thermal Resistance (θJA), and
JMAX
mΩ
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Page 4

AC Electrical Characteristics

Limits are for TJ= 25˚C and VIN= 5.0V.
LM3543
Symbol Parameter Conditions Min Typ Max Units
t
r
t
f
t
ON
t
OFF
t
F
Note 5: Time for OUTxto rise from 10% to 90% of its enabled steady-state value after ENx(ENx) is asserted.
Note 6: Time for OUTxto fall from 10% to 90% of its enabled steady-state value after ENx(ENx) is deasserted.
Note 7: Time between ENxrising through VIH(ENxfalling through VIL) and OUTxrising through 90% of its enabled steady-state voltage.
Note 8: Time between ENxfalling through VIL(ENxrising through VIH) and OUTxfalling through 10% of its enabled steady-state voltage.
Note 9: Time between ENxrising through VIN(ENxfalling through VIN) and FLAGXfalling through 0.3V when OUTXis connected to GND.
OUTxRise Time (Note 5) CL= 33 µF, I
OUTxFall Time (Note 6) CL= 33 µF, I
Turn-on Delay (Note 7) CL= 33 µF, I
Turn-off Delay (Note 8) CL= 33 µF, I
Flag Delay (Note 9) I
=10mA 7 ms
FLAG
= 500mA 1.5 ms
LOAD
= 500mA 0.9 ms
LOAD
= 500mA 2.9 ms
LOAD
= 500mA 0.7 ms
LOAD

Pin Descriptions

Pin Number Pin Name Pin Function
2, 6 IN 1, 2 Supply Inputs: These pins are the inputs to the power switches and the supply
input for the IC. In most applications they are connected together externally and to a single input voltage supply.
1, 5 GND 1, 2 Grounds: Must be connected together and to a common ground.
15, 14, 11 OUT 1, 2, 3 Switch Outputs: These pins are the outputs of the high side switches.
3, 4, 7 LM3543-H: EN 1, 2, 3
LM3543-L: EN 1, 2, 3
16, 13, 12 FLAG 1, 2, 3 Fault Flag (Outputs): Active-low open drain outputs. Indicates over-current,
8, 9, 10 N/C No Internal Connection.
Enable (Inputs): Active-high (or active-low) logic enable inputs.
UVLO or thermal shutdown.
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LM3543

Typical Performance Characteristics V

fied.
vs Input Voltage RONvs Junction Temperature
R
ON
10125805
Quiescent Current, Output(s) Enabled vs
Junction Temperature
= 5.0, I
IN
= 500mA, TA= 25˚C unless otherwise speci-
OUT_X
10125806
Quiescent Current, Output(s) Disabled vs
Junction Temperature
10125807
Quiescent Current, Output(s) Enabled vs
Input Voltage
10125809
10125808
Quiescent Current, Output(s) Disabled vs
Input Voltage
10125810
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Typical Performance Characteristics V
specified. (Continued)
LM3543
Short-Circuit Output Current vs Junction Temperature (Note 10)
10125813 10125814
= 5.0, I
IN
= 500mA, TA= 25˚C unless otherwise
OUT_X
Over-Current Threshold vs
Junction Temperature (Note 10)
Under-Voltage Lockout (UVLO) Threshold vs
Junction Temperature
10125815
Turn-Off Delay vs Input Voltage
(C
IN
= 33 µF, C
OUT
=33µF)
Turn-On Delay vs Input Voltage
(C
IN
= 33 µF, C
OUT
=33µF)
10125811
Fault Flag Delay Time vs
Junction Temperature
10125812
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10125816
Page 7
LM3543
Typical Performance Characteristics V
IN
= 5.0, I
= 500mA, TA= 25˚C unless otherwise
OUT_X
specified. (Continued)
Turn-On/Turn-Off Response with 47Ω/33µF Load Turn-On/Turn-Off Response with 10Ω/33µF Load
10125818 10125819
Enable Into a Short (Note 10) Short Connected to Enabled Device (Note 10)
10125820 10125821
Over-Current Response with Ramped Load
on OUT1 and Fixed Load on OUT2 (Note 10)
10125822 10125823
Note 10: Output is shorted to Ground through a 100 mΩ resistor.
Note 11: Load is two capacitors and one resistor in parallel to model an actual USB load condition. The first capacitor has a value of 33 µF to model the LM3543
output capacitor. The second capacitor has a value of 10 µF to model the maximum allowable input capacitance of the downstream device. The resistor is a 47Ω resistor to model the maximum allowable input resistance of the downstream device.
Inrush Current to Downstream Device
when LM3543 is Enabled (Note 11)
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Functional Descriptions

LM3543

POWER SWITCHES

The power switches that comprise the three ports of the LM3543 are N-Channel MOSFETs. They have a typical on­state drain-to-source resistance of 90 mΩ when the input voltage is 5 V. When enabled, each switch will supply a 500 mA minimum current to its load. In the unlikely event that a switch is enabled and the output voltage of that switch is pulled above the input voltage, the bi-directional nature of the switch results in current to flow from the output to the input. When a switch is disabled, current flow through the switch is prevented in both directions.

CHARGE PUMP AND DRIVER

rapidly discharge through the part, activating current limit circuitry. The threshold for activating current limiting is 2.0A (typ.). Protection is achieved by momentarily opening the MOSFET switch and then gradually turning it on. Turn-on is halted when the current through the switch reaches the current-limit level of 1.0A (typ.) The current is held at this level until either the excessive load/short is removed or the part overheats and thermal shutdown occurs (see Thermal Shutdown section, below). The fault flag of a switch is as­serted whenever the switch is current limiting.
If a port on the LM3543 is enabled into a short condition, the output current of that port will rise to the current-limit level and hold there.
When a port is in a current-limit condition, the LM3543 senses the output voltage on that port and, if it is less than
1.0V (typ.), will reduce the output current through that port. This operation is shown in Figure 2, below. The current reduction, or foldback, reduces power dissipation through the overloaded MOSFET switch. An additional advantage of the foldback feature is the reduction of power required from the source supply when one or more output ports are shorted.
ENABLE (EN
or ENx)
x
The LM3543 comes in two versions: an active-high enable version, LM3543-H, and an active-low enable version, LM3543-L. In the LM3543-H, the EN
pins are active-high
x
logic inputs that, when asserted, turn on the associated power supply switch(es). Power supply switches are con­trolled by the EN
active-low logic inputs in the LM3543-L.
x
With all three ports disabled on either version of the LM3543, less than 5 µA of supply current is consumed. Both types of enable inputs, active-high and active-low, are TTL and CMOS logic compatible.

INPUT AND OUTPUT

The power supply to the control circuitry and the drains of the power-switch MOSFETs are connected to the two input pins, IN1 and IN2. These two pins are connected externally in most standard applications. The two ground nodes GND1 and GND2 must be connected externally in all applications.
Pins OUT1, OUT2, and OUT3 are connections to the source nodes of the power-switch MOSFETs. In a typical application circuit, current flows through the switches from IN1 and IN2 to OUT
toward the load.
x

UNDERVOLTAGE LOCKOUT (UVLO)

Undervoltage Lockout (UVLO) prevents the MOSFET switches from turning on until the input voltage exceeds a typical value of 1.8V.
If the input voltage drops below the UVLO threshold, the MOSFET switches are opened and fault flags are activated. UVLO flags function only when one or more of the ports is enabled. Due to the paired nature of the design, both FLAG1 and FLAG2 will assert if either port1 or port2 is enabled in a UVLO condition.
10125817
FIGURE 2. Short-Circuit Output Current (with
Foldback) vs. Output Voltage

THERMAL SHUTDOWN

The LM3543 is internally protected against excessive power dissipation by a two-stage thermal protection circuit. If the device temperature rises to approximately 145˚C, the ther­mal shutdown circuitry turns off any switch that is current limited. Non-overloaded switches continue to function nor­mally. If the die temperature rises above 160˚C, all switches are turned off and all three fault flag outputs are activated. Hysteresis ensures that a switch turned off by thermal shut­down will not be turned on again until the die temperature is reduced to 135˚C. Shorted switches will continue to cycle off and on, due to the rising and falling die temperature, until the short is removed.
The thermal shutdown function is shown graphically in Fig- ure 3 and Figure 4.

CURRENT LIMIT AND FOLDBACK

The current limit circuit is designed to protect the system supply, the LM3543 switches, and the load from potential damage resulting from excessive currents. If a direct short occurs on an output of the LM3543, the input capacitor(s)
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Functional Descriptions (Continued)
10125825
FIGURE 3. Thermal Shutdown Characteristics when
only the First-Stage Thermal-Shutdown Mode is
Needed

SOFT START

When a power switch is enabled, high levels of current will flow instantaneously through the LM3543 to charge the large capacitance at the output of the port. This is likely to exceed the over-current threshold of the device, at which point the LM3543 will enter its current-limit mode. The amount of current used to charge the output capacitor is then set by the current-limit circuitry. The device will exit the current-limit mode when the current needed to continue to charge the output capacitor is less than the LM3543 current-limit level.

FAULT FLAG

The fault flags are open-drain outputs, each capable of sinking up to a 10 mA load current to typically 100 mV above ground.
A parasitic diode exists between the flag pins and V Pulling the flag pins to voltages higher than V
IN
pins.
IN
will forward bias this diode and will cause an increase in supply current. This diode will also clamp the voltage on the flag pins to a diode drop above V
.
IN
The fault flag is active (pulled low) when any of the following conditions are present: under-voltage, current-limit, or thermal-shutdown.
The LM3543 has an internal delay in reporting fault condi­tions that is typically 7 ms in length. In start-up, the delay gives the device time to charge the output capacitor(s) and exit the current-limit mode before a flag signal is set. This delay also prevents flag signal glitches from occurring when brief changes in operating conditions momentarily place the LM3543 into one of its three error conditions. If an error condition still exists after the delay interval has elapsed, the appropriate fault flag(s) will be asserted (pulled low) until the error condition is removed. In most applications, the 7 ms internal flag delay eliminates the need to extend the delay with an external RC delay network.
LM3543
10125826
FIGURE 4. Thermal Shutdown Characteristics when
Both First-Stage and Second-Stage Thermal-Shutdown
Modes are Needed
In Figure 3, port 1 is enabled into a short. When this occurs, the MOSFET switch of port 1 repeatedly opens and closes as the device temperature rises and falls between 145˚C and 135˚C. In this example, the device temperature never rises above 160˚C. The second stage thermal shutdown is not used and port 2 remains operational.
When port 1 is enabled into a short in the example illustrated in Figure 4, the device temperature immediately rises above 160˚C. A higher ambient temperature or a larger number of shorted outputs can cause the junction temperature to in­crease, resulting in the difference in behavior between the current example and the previous one. When the junction temperature reaches 160˚C, all three ports are disabled (port 3 is not shown in the figure) and all three fault-flag signals are asserted. Just prior to time index 2.5 ms, the device temperature falls below 135˚C, all three ports activate, and all three fault flags are removed. The short condition remains on port 1, however. For the remainder of the example, the device temperature cycles between 135˚C and 145˚C, caus­ing port 1 to repeatedly turn on and off but allowing the un-shorted ports to function normally.

Application Information

OUTPUT FILTERING

The schematic in Figure 1 showed a typical application circuit for the LM3543. The USB specification requires 120 µF at the output of each hub. A three-port hub with 33 µF tantalum capacitors at each port output meets the specifica­tion. These capacitors provide short-term transient current to drive downstream devices when hot-plug events occur. Ca­pacitors with low equivalent-series-resistance should be used to lower the inrush current flow through the LM3543 during a hot-plug event.
The rapid change in currents seen during a hot plug event can generate electromagnetic interference (EMI). To reduce this effect, ferrite beads in series between the outputs of the LM3543 and the downstream USB port are recommended. Beads should also be placed between the ground node of the LM3543 and the ground nodes of connected down­stream ports. In order to keep voltage drop across the beads to a minimum, wire with small DC resistance should be used through the ferrite beads. A 0.01 µF - 0.1 µF ceramic capaci­tor is recommended on each downstream port directly be­tween the V fects.

POWER SUPPLY FILTERING

A sizable capacitor should be connected to the input of the LM3543 to ensure the voltage drop on this node is less than 330 mV during a heavy-load hot-plug event. A 33 µF, 16V
and ground pins to further reduce EMI ef-
bus
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Page 10
Application Information (Continued)
tantalum capacitor is recommended. The input supply
LM3543
should be further bypassed with a 0.01 µF - 0.1 µF ceramic capacitor, placed close to the device. The ceramic capacitor reduces ringing on the supply that can occur when a short is present at the output of a port.

EXTENDING THE FAULT FLAG DELAY

While the 7 ms (typical) internal delay in reporting flag con­ditions is adequate for most applications, the delay can be extended by connecting external RC filters to the FLAG pins, as shown in Figure 5.
FIGURE 5. Typical Circuit for Lengthening the Internal
Flag Delay

POWER DISSIPATION AND JUNCTION TEMPERATURE

A few simple calculations will allow a designer to calculate the approximate operating temperature of the LM3543 for a given application. The large currents possible through the low resistance power MOSFET combined with the high ther­mal resistance of the SOIC package, in relation to power packages, make this estimate an important design step.
Begin the estimate by determining R operating temperature using the graphs in the Typical Per­formance Characteristics section of this datasheet. Next, calculate the power dissipation through the switch with Equation (1).
at the expected
ON
10125828
PD=R
ON*IDS
2
(1)
Using this figure, determine the junction temperature with Equation (2).
=PD*θJA+TA. (2)
T
J
Where:
= SOIC Thermal Resistance: 130˚C/W and TA= Ambient
θ
JA
Temperature (˚C). Compare the calculated temperature with the expected tem-
perature used to estimate R match, re-estimate R
ON
. If they do not reasonably
ON
using a more appropriate operating temperature and repeat the calculations. Reiterate as nec­essary.

PCB LAYOUT CONSIDERATIONS

In order to meet the USB requirements for voltage drop, droop and EMI, each component used in this circuit must be evaluated for its contribution to the circuit performance. These principles are illustrated in Figure 6. The following PCB layout rules and guidelines are recommended
1. Place the switch as close to the USB connector as
possible. Keep all V use at least 50-mil, 1 ounce copper for all V
traces as short as possible and
bus
bus
traces.
Solder plating the traces will reduce the trace resistance.
2. Avoid vias as much as possible. If vias are used, use
multiple vias in parallel and/or make them as large as possible.
3. Place the output capacitor and ferrite beads as close to
the USB connector as possible.
4. If ferrite beads are used, use wires with minimum resis-
tance and large solder pads to minimize connection resistance.

FIGURE 6. Self-Powered Hub Connections and Per-Port Voltage Drop

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10125827
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Typical Applications

ROOT AND SELF-POWERED USB HUBS

The LM3543 has been designed primarily for use in root and self-powered USB hubs. In this application, the switches of the LM3543 are used to connect the power source of the hub to the power bus used by downstream devices and to protect the hub from dangerously excessive loads and shorts to ground. A high-power bus-powered function, low-power bus­powered function, or a bus-powered hub can be driven through a single port of the LM3543. A schematic of a circuit that uses the LM3543 for power-supply switching in a typical root or self-powered hub was shown earlier in this datasheet in Figure 1.
Voltage drop requirements of USB power supplies require the power outputs of the root and self-powered hubs to be no less than 4.75V. For this reason, it is recommended that a 5V power supply with a this application. Combining a 3% supply with a low­resistance PCB design and the low on-resistance of the LM3543 power switches will ensure that the hub power outputs meet the USB voltage drop specification even with a 500mA load, the maximum allowed in the USB standard.

BUS-POWERED USB HUBS

±
3% output voltage tolerance is used in
LM3543
Instead, the input pins should be connected to the power bus supplied by the upstream hub.

USB BUS-POWERED FUNCTIONS AND GENERAL IN-RUSH CURRENT LIMITING APPLICATIONS

The LM3543 can be placed at the power-supply input of USB bus-powered functions, or other similar devices, to protect them from high in-rush currents. If the current being deliv­ered to the device were to exceed the 2.0A over-current threshold (typ.) of the LM3543, switches in violation would open to protect the device from damage.
In addition to in-rush current limiting, the LM3543 can be used in high-power bus-powered functions to keep current levels of the function in compliance during power-up. The USB specification requires the staged switching of power when connecting high-power functions to the bus. When a high-power function is initially connected to the bus, it must not draw more than one unit supply (100mA). After a con­nection is detected and enumerated, and if the upstream device is capable of supplying the required power, the high­power function may draw up to five unit loads (500mA). With the proper control signals, the LM3543 can be used to achieve this staged power connection. When the function is connected to the bus, one or more of the LM3543 switches can be closed to connect bus power only to circuitry needed during the connection and enumeration process. If the func­tion is to be powered fully, remaining switches on the LM3543 can be closed to connect all blocks of the function to the power bus. Figure 7 illustrates how the LM3543 can be connected for use in bus powered functions.

FIGURE 7. Using the LM3543 in USB Bus-Powered Functions

10125831
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Physical Dimensions inches (millimeters) unless otherwise noted

Order Number LM3543M-H, LM3543M-L, LM3543MX-H or LM3543MX-L
NS Package Number M16A
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.
For the most current product information visit us at www.national.com.
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1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform when properly used in accordance with instructions for use
LM3543 Triple Port USB Power Distribution Switch and Over-Current Protection
provided in the labeling, can be reasonably expected to result in a significant injury to the user.
2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.
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