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PDF SC2041 Data sheet ( Hoja de datos )

Número de pieza SC2041
Descripción HotSwitch USB Power Distribution Switch With Shutdown
Fabricantes Semtech Corporation 
Logotipo Semtech Corporation Logotipo



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HotSwitch™ USB Power Distribution
Switch With Shutdown
SC2041
July 18, 2000
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
DESCRIPTION
USB power distribution switches are high-side
N-channel MOSFET switches with built-in overcurrent
protection and low on-state resistance. The SC2041
switch is designed to meet the USB requirements for
power switching and maintenance-free fault protection
for self-powered & bus-powered hub applications. The
SC2041 features low on-state resistance to meet the
USB requirement for voltage drop and regulation. The
switch is controlled by a shutdown input that is
compatible with 3V and 5V logic. The device is active
when the shutdown input is low. See SC2051 for an
active high version. The device provides short circuit
current limiting at a value of less than 1.0A, well below
the USB limit of 5A. During an overcurrent condition the
device provides a fault notification to signal the USB
controller. An integrated thermal protection circuit
automatically shuts the switch off when the junction
temperature reaches its thermal limit. The switch
remains off until the junction temperature drops
approximately 20°C. The switch will continue to cycle
on and off until the fault is removed. Inrush current
limiting prevents voltage drop on an upstream port
when the switch is enabled. An undervoltage lockout
circuit guarantees the switch is initially off during
start-up.
FEATURES
= Designed to meet USB specification revisions 1.1
and 2.0 power management requirements
= 500mA continuous load current
= High-side MOSFET switch with low RDS(ON)
= Short-circuit current protection
= Internal thermal shutdown
= Undervoltage lockout
= Open drain fault output
= Soft start circuit with slow turn-on time
= Wide supply voltage range: 2.8V to 5.5V
= 2.5kV ESD rating (Human Body Model)
= Full industrial temperature range
APPLICATIONS
= Universal Serial Bus (USB) power management
= Self-powered or bus-powered USB hubs
= Root hubs in desktop PCs & servers
= Notebook PCs
= Peripherals
ORDERING INFORMATION
DEVICE(1)
PACKAGE
SC2041IS.TR
SO-8
Note:
(1) Only available in tape and reel packaging. A reel
contains 2500 devices.
TYPICAL APPLICATION CIRCUIT
VBUS IN
Shutdown Signal From USB Controller
Flag Output To USB Controller
R1
U1
1
GND
2 IN
3
IN
4 SHDN
SC2041
8
OUT
OUT 7
6
OUT
FLG 5
VBUS OUT
C1
0.1uF
C2
0.1uF
C3
22uF
© 2000 SEMTECH CORP.
1
652 MITCHELL ROAD NEWBURY PARK CA 91320

1 page




SC2041 pdf
HotSwitch™ USB Power Distribution
Switch With Shutdown
SC2041
July 18, 2000
TYPICAL CHARACTERISTICS
On-State Quiescent Current vs. Junction
Temperature vs. Input Voltage
120
VIN = 5.0V
100
VIN = 3.3V
80
VIN = 3.0V
60
40
20 IOUT = 500mA
VSHDN = GND
0
-50 -25
0
25 50
TJ (°C)
75 100 125
Off-State Quiescent Current vs. Input
Voltage vs. Junction Temperature
300
250 TA = 125°C
200
150
100 TA = -40°C
50
VSHDN = VIN
0
2.5 3.0
3.5 4.0 4.5
VIN (V)
TA = 25°C
5.0 5.5
Power Switch On Resistance vs. Input
Voltage vs. Junction Temperature
135
VSHDN = GND
125 IOUT = 500mA
115 TJ = 125°C
105
95
85 TJ = 25°C
75
65 TJ = -40°C
55
2.5 3.0 3.5 4.0 4.5 5.0 5.5
VIN (V)
On-State Quiescent Current
vs. Input Voltage
120
TJ = 25°C
IOUT = 500mA
100 VSHDN = GND
80
60
40
20
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
VIN (V)
Power Switch On Resistance vs. Junction
Temperature vs. Input Voltage
135
VSHDN = GND
125 IOUT = 500mA
115
105
95
Top to bottom:
85 VIN = 3.0V
VIN = 3.3V
75 VIN = 5.0V
65
55
-50
-25
0
25 50 75 100 125
TJ (°C)
Output Turn-On Rise Time vs. Input
Voltage vs Junction Temperature
2.5
TJ = 125°C
2.0
TJ = 25°C
1.5
1.0 TJ = -40°C
0.5 COUT = 1µF
ROUT = 6.6(VIN = 2.8V and 3.3V)
ROUT = 10(VIN = 5V and 5.5V)
0.0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
VIN (V)
© 2000 SEMTECH CORP.
5
652 MITCHELL ROAD NEWBURY PARK CA 91320

5 Page





SC2041 arduino
HotSwitch™ USB Power Distribution
Switch With Shutdown
SC2041
July 18, 2000
APPLICATIONS INFORMATION (Cont.)
power planes) and PD(MAX) = 37.5mW, we calculate the
worst-case TJ to be:
TJ = 85 + 130 0.0375 = 90° C
Thus it can be seen that this device does not require
any additional copper area for heatsinking under
normal operating conditions. Sustained overcurrents or
short circuits will rapidly heat TJ > 150°C, thus
activating the thermal shutdown circuitry.
Layout Considerations
The ceramic bypass capacitors for IN and OUT should
be connected as close to the relevant device pins as
possible. The bulk output capacitors required by the
USB specification should be placed close to the USB
connector to provide a low impedance source for hot
plug purposes. Ferrite beads should be placed on the
VBUS and Ground pins of the downstream connectors to
reduce the droop on adjacent ports during hot plug
events.
TYPICAL APPLICATIONS CIRCUITS
Self-Powered Hub, Individual Port Power
Management:
A self-powered hub must supply a continuous 500mA
of current to each downstream port. Since an internal
power supply is used to supply the power, self-powered
hubs are required to implement overcurrent protection
for safety. The self-powered hub must also have a
method to detect and report fault conditions to the USB
controller. The circuit below utilizes the SC2041 to
provide individual port overcurrent protection & power
switching for maximum port protection. Under fault
conditions, the SC2041 provides the short-circuit
current limiting function and has a fault flag logic output
for notifying the hub controller. The USB hub can use
the SC2041 to remove power from the faulty port,
allowing the other ports to operate normally.
Since USB is a hot insertion and removal system, USB
ports are subject to electrostatic discharge (ESD). The
SRDA05-4 provides ESD protection on the downstream
data and power lines. Each device will protect two USB
ports. With proper layout the port is hardened to greater
than 15kV, meeting the requirements of IEC 1000-4-2.
The SC5205 LDO regulator is used to power the hub
controller from the hub’s 5V power supply.
+5V
GND
5V Power Supply
D+
D-
VBUS
GND
Upstream Port
C1
4.7uF
U2
1 VIN VO 5
2 GND
3 EN BYP 4
SC5205-3.3
EN
OC
D0D+
D0D-
C2
10nF
VCC
C3
4.7uF
D1D+
D1D-
USB Controller
R1 100k
U3 SC2041
1
GND
OUT
2 IN
OUT
3
IN
OUT
4 SHDN FLG
8
7
6
5
C4
0.1uF
U4
I/O1 REF1
I/O2 REF1
I/O3 REF2
I/O4 REF2
SRDA05-4
C5
33uF
Ferrite Bead
Ferrite Bead
VBUS
D+
D-
GND
Downstream Port
Notes:
(1) One port only shown for simplicity.
(2) 33µF output capacitor assumes four downstream ports for this hub, therefore meeting the USB specification
requirement of 120µF minimum capacitance per hub.
(3) The SRDA05-4 shown would also protect lines D2D+ and D2D-.
© 2000 SEMTECH CORP.
11
652 MITCHELL ROAD NEWBURY PARK CA 91320

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