Datasheet

LT3508
16
3508fd
APPLICATIONS INFORMATION
TRACK/SS1
(8a)
LT3508
20ms/DIV
V
OUT1
1V/DIV
20ms/DIV
1V/DIV
20ms/DIV
1V/DIV
V
OUT2
TRACK/SS2
0.1µF
0.047µF
3.3V
5V
TRACK/SS1
(8b)
LT3508
V
OUT1
V
OUT2
TRACK/SS2
0.22µF
3.3V
5V
TRACK/SS1
(8e)
LT3508
V
OUT1
V
OUT2
TRACK/SS2
3.3V
5V
R1
28.7k
R2
10.0k
Independent Start-Up Ratiometric Start-Up
Coincident Start-Up
TRACK/SS1
(8d)
LT3508
V
OUT1
PG1
V
OUT2
TRACK/SS2
0.1µF
0.047µF
3.3V
5V
EXTERNAL
SOURCE
Output Sequencing
Controlled Power Up and Down
+
–
TRACK/SS1
(8c)
LT3508
V
OUT1
V
OUT2
TRACK/SS2
0.1µF
3.3V
5V
R1
28.7k
R2
10.0k
V
OUT1
V
OUT1
V
OUT2
V
OUT2
V
OUT1
V
OUT2
20ms/DIV
1V/DIV
20ms/DIV
1V/DIV
V
OUT1
V
OUT2
V
OUT1
V
OUT2
EXTERNAL SOURCE
Figure 8
Output Tracking and Sequencing
Complex output tracking and sequencing between channels
can be implemented using the LT3508’s TRACK/SS and
PG pins. Figure 8 shows several confi gurations for output
tracking and sequencing of 5V and 3.3V applications.
Independent soft-start for each channel is shown in Fig-
ure 8a. The output ramp time for each channel is set by the
soft-start capacitor as described in the soft-start section.