LTC4242
20
4242f
APPLICATIO  S I FOR  ATIO
U
U
U
Using P
ON
 and t
1
 to look up the MOSFETs single pulse
?/DIV>
JA(MAX)
  from the manufacturers Transient Thermal
Impedance Graph, the worst-case junction-to-ambient
temperature rise occurs for the 12V MOSFET.
Table 4. MOSFET Power-Up Temperature Rise Calculation
VOLTAGE SUPPLY
P
ON
?/DIV>
JA(MAX)
?SPAN class="pst LTC4242CUHF-TRPBF_2347206_7">T
12V
11W
0.75癈/W
8.3癈
3.3V
0.5W
0.6癈/W
0.3癈
There is a 20祍  lter time when large current of 2x circuit
breakers threshold can  ow in the switches. This time is
short enough to cause minimal increase in the junction-
to-ambient temperature of the MOSFETs, in the event of
powering up into short circuit or short circuiting after
power up. Therefore, in these events, it can be safely
assumed that the MOSFETs would have minimal thermal
stress on them.
If the LTC4242 operates in the diagnostic mode, user must
ensure a safe joule heating limit of the external MOSFET.
The internal switch will be disabled once the temperature
reaches 150癈, thereby preventing overheating.
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