Hello,
Is there any LT3065 product which has a junction temperature of 175°C or higher? MP- and H- grades have a junction temperature of 150°C, are these absolute maximum values? What happens when the temperature exceeds 150°C? Asking this because in my project, I have a problem with high power dissipation. My values are:
Vin_max = 29.5V, Iload = 117mA, Vout = 5V, Tambient_max = 50°C
Can I use any LT3065 product if I have such values in my project?
Best regards,
Hello,
in your setup the power dissipation is 2.867W!!!! With the thermal impedance (Junction-ambient) values from the datasheet of 28C/W (MSOP) resp. 31C/W (DFN) you have a deltaT of 80.2K resp. 88.8K. If ambient is 50C you end up with a junction temp of 130k or more (with optimum layout for thermal performance), otherwise more.
H and MP grade are capable for this, but in general I would recommend a switcher for a more efficent DC/DC conversion or a different LDO with a larger package and better thermal impedance values.
LT3081 offers TEMP pin for monitoring, larger packages and hence better thermal performance. But still getting hot for sure.
Hello,
in your setup the power dissipation is 2.867W!!!! With the thermal impedance (Junction-ambient) values from the datasheet of 28C/W (MSOP) resp. 31C/W (DFN) you have a deltaT of 80.2K resp. 88.8K. If ambient is 50C you end up with a junction temp of 130k or more (with optimum layout for thermal performance), otherwise more.
H and MP grade are capable for this, but in general I would recommend a switcher for a more efficent DC/DC conversion or a different LDO with a larger package and better thermal impedance values.
LT3081 offers TEMP pin for monitoring, larger packages and hence better thermal performance. But still getting hot for sure.
