AAT4626
USB Dual-Channel Power Switch
V+
100kΩ
AAT4626
USB Controller
1
2
3
4
8
7
6
5
R1
10kΩ
ENA OUTA
Over-Current
Flag Input
FLGA IN
FLGB GND
ENB OUTB
C1
0.1μF
Figure 1: Fault Flag Delay RC Filter.
ramping fashion and regulate the inrush current
within the specified current limit for the device. The
error flag usually will not be affected during appli-
cation turn-on since the 10ms fault flag blanking
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 dur-
ing the start-up sequence.
Hot-Plug Applications
Application circuit cards with a high inrush 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
Cable / Connector
to Hot-Plug Port
AAT4626
0.1μF
Card
Application
Circuit A
V+
1
2
3
4
8
ENA OUTA
VBUS
7
FLGA
IN
6
5
C
BULKA
(120μF)
C
FLGB GND
ENB OUTB
Hot-Plug
Receptacle
IN
4.7μF
Card
Application
Circuit B
C
BULKB
(120μF)
GND
GND
Dual Channel
Inrush Current Protected
Application Card
Figure 2: AAT4626 Input Inrush Current Protected Dual Output Application.
10
4626.2006.05.1.2
AAT [ ADVANCED ANALOG TECHNOLOGY, INC. ]
