Datasheet

LTC6655
15
6655fd
For more information www.linear.com/LTC6655
applicaTions inForMaTion
the absolute maximum junction temperature rating of the
device would be exceeded. Although the maximum junction
temperature is 150°C, for best performance it is recom
-
mended to not exceed a junction temperature of 125°C.
The plot in Figure 14 shows the recommended maximum
ambient temperature limits for differing V
IN
and load con-
ditions using a maximum junction temperature of 125°C.
Power Dissipation
Power dissipation for the LTC6655 depends on V
IN
and
load current. Figure 13 illustrates the power consump-
tion versus V
IN
under a no-load and 5mA load condition
at room temperature for the LTC6655-2.5. Other voltage
options display similar behavior.
The MSOP8 package has a thermal resistance (θ
JA
)
equal to 300°C/W. Under the maximum loaded condition,
the increase in die temperature is over 35°C. If operated
at these conditions with an ambient temperature of 125°C,
V
IN
(V)
0
105
115
125
12
6655 F13
95
85
3 6 9 15
75
65
55
MAXIMUM AMBIENT
OPERATING TEMPERATURE (°C)
NO LOAD
5mA LOAD
Figure 14. LTC6655-2.5 Maximum
Ambient Operating Temperature
V
IN
(V)
0
0.14
0.12
0.10
0.08
0.06
0.04
0.02
0
6655 F12
5
10
NO LOAD
15
POWER (W)
5mA LOAD
Figure 13. LTC6655-2.5 Power Consumption
Figure 12a. 3-Sided PCB Tab Cutout
Figure 12b. 4-Sided PCB Cutout
LS8
6655 F12b
LS8
6655 F12a