AAT4626 Datasheet, PDF (10/15 Pages) Advanced Analogic Technologies – USB Dual-Channel Power Switch

USB Controller
Over-Current
Flag Input
AAT4626
USB Dual-Channel Power Switch
V+
R1
10kΩ
C1
0.1μF
100kΩ _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 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
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.
Cable / Connector
to Hot-Plug Port
V_BUS
Hot-Plug
Receptacle
V+
C_IN
4.7μF
AAT4626
1 _{ENA OUTA} 8
2 _FLGA
IN ⁷
3 _{FLGB GND} 6
4 _{ENB OUTB} 5
GND
GND
Dual Channel
Inrush Current Protected
Application Card
0.1μF
C_BULKA
(120μF)
Card
Application
Circuit A
C_BULKB
(120μF)
Card
Application
Circuit B
Figure 2: AAT4626 Input Inrush Current Protected Dual Output Application.
10
4626.2006.05.1.2