ISL6185 Datasheet, PDF (10/20 Pages) Intersil Corporation – Dual USB Port Power Supply Controller

ISL6185
Turn-off Time Delay
During operation, once an OC condition is detected
the output is current limited for ~12ms to allow
transient OC conditions to pass. If still in current limit
and after the current limit period has elapsed, the
output is then turned off and the fault is reported by
pulling the corresponding FAULT low. The internal
12ms timer starts upon current limiting and is
independent of ambient or IC thermal conditions
providing more consistent operation over the entire
temp range.
Latchoff Restart/Auto-Restart Start
After turn-off, with the latch off options both the
output and the FAULT signal are latched low until
Typical Performance Curves
150
140
130
120
110
V_IN = 2.5V
100
90
V_IN = 3.3V
80
70
V_IN = 5V
60
50
-40 -25
0 25 45 75
TEMPERATURE (°C)
85 115
FIGURE 1. SWITCH ON-RESISTANCE AT 0.5A
reset by the enable signal being de-asserted at which
time the FAULT signal will clear and the IC is ready for
enable to assert. On the auto restart options the
ISL6185 will attempt to periodically turn-on the
output at approximately 1s intervals as long as the
enable is asserted. If the OC condition remains
indefinitely so will the fault indication and the restart
attempts until such time that the thermal protection
feature is invoked increasing the restart period.
Active Output Pull-down
Another ISL6185 feature is the 10kΩ active pull-down on
the outputs to <60mV above GND when the device is
disabled ensuring discharge of the load.
1.3
1.2
1.1
1.0
0.9
0.8
0.7
-40 -25
0 25 45 75
TEMPERATURE (°C)
85 115
FIGURE 2. NORMALIZED SWITCH RESISTANCE
1.2
5V I_TRIP
1.1
1.0
0.9 ^{3.3V ITRIP}
0.8
0.7 ^{5V ISC}
5V I_LIM
0.6
3.3V I_LIM
0.5
0.4
-40 -25
3.3V I_SC
0 25 45 75
TEMPERATURE (°C)
85 115
FIGURE 3. 0.6A CONTINUOUS CURRENT
CHARACTERISTICS
1.6
1.5
1.4 ^{5V ITRIP}
1.3 ^{3.3V I}TRIP
5V I_SC
1.2
1.1 ^{5V ILIM}
1.0 3.3V I_LIM
0.9
0.8
3.3V I_SC
0.7
0.6
-40 -25
0 25 45 75
TEMPERATURE (°C)
85 115
FIGURE 4. 1.1A CONTINUOUS CURRENT
CHARACTERISTICS
10
FN6937.0
October 22, 2010