SC2041 View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
'SC2041' PDF : 14 Pages View PDF
HotSwitch™ USB Power Distribution
Switch With Shutdown
SC2041
July 18, 2000
TYPICAL APPLICATIONS CIRCUITS (Cont.)
High-Power or Low-Power Bus-Powered Function:
Both low-power and high-power bus-powered functions
must draw less than 100mA at startup. At this time,
they must also present a load of less than the parallel
combination of a 44Ω resistor and a 10µF capacitor.
After startup, high powered functions may then draw up
to 500mA. The circuit below utilizes the SC2041 to
provide inrush current limiting and power switching for
the internal function.
Since USB is a hot insertion and removal system, USB
ports are subject to electrostatic discharge (ESD). The
SR05 provides ESD protection on the upstream data
and power lines. With proper layout the port is hard-
ened 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 upstream bus.
D+
D-
VBUS
GND
Upstream Port
U1
1
1
22
4
4
33
SR05
C1
10uF
U2
1
5
VIN VO
2
GND
3 EN BYP 4
SC5205-3.3
EN
OC
D0D+
D0D-
C2
10nF
C3
4.7uF
VCC
USB Controller
R1 100k
U3 SC2041
1 GND
OUT 8
2 IN
OUT 7
3 IN
OUT 6
4 SHDN FLG 5
C4
0.1uF
C5
10uF
VCC
GND
Internal Function
Note:
(1) 33µF output capacitor per port meets the USB specification minimum capacitance of 120µF per hub.
© 2000 SEMTECH CORP.
13
652 MITCHELL ROAD NEWBURY PARK CA 91320
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