AAT4626 Datasheet, PDF (9/14 Pages) Advanced Analogic Technologies – USB Dual-Channel Power Switch

USB Controller
Over Current
Flag Input
AAT4626
USB Dual-Channel Power Switch
V+
R1
10k
C1
0.1µF
100k _AAT4626
1 _{ENA OUTA} 8
2 _{FLGA IN} 7
3 _{FLGB GND} 6
4 _{ENB OUTB} 5
Figure 1: Fault Flag delay RC filter.
Hot-Plug Applications
Application circuit cards with a high in-rush current
potential can be limited by use of the AAT4626.
The AAT4626 has both slew rate limited turn on
characteristics and current limit controlled outputs,
which make it ideally suited for power port hot-plug
applications. A host power back plane or hot plug
receptacle may be sensitive to short duration high
power surges. The AAT4626 will turn on in a linear
ramping fashion and regulate the inrush current
with in the specified current limit for the device.
The error flag usually will not be effected during
application turn on since the 10ms fault flag blank-
ing time is intended for these types of events. If an
application turn on current surge exceeds 10ms, an
RC delay filter may be added to the Flag output to
prevent the system from receiving an error during
the start up sequence.
Cable / Connector
to Hot-Plug Port
V_BUS
Hot-Plug
Receptacle
V+
C_IN
4.7µF
AAT4626
1
8
ENA OUTA
2
FLGA
7
IN
3
6
FLGB GND
4
5
ENB OUTB
GND
GND
Dual Channel
Inrush Current Protected
Application Card
0.1µF
C_BULKA
(120µF)
Card
Application
Circuit A
C_BULKB
(120µF)
Figure 2: AAT4626 Input Inrush Current Protected Dual Output Application
Card
Application
Circuit B
4626.2002.1.0.93
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