AME5252 Datasheet, PDF (12/18 Pages) Analog Microelectronics – Dual Synchronous, 600mA, 1.5MHz Step-Down DC/DC Converter

AME
AME5252
Dual Synchronous, 600mA, 1.5MHz
Step-Down DC/DC Converter
Thermal Considerations
In most applications the AME5252 does not dissipate
much heat due to its high efficiency. But, in applications
where the AME5252 is running at high ambient tempera-
ture with low supply voltage and high duty cycles, such
as in dropout, the heat dissipated may exceed the maxi-
mum junction temperature of the part. If the junction tem-
perature reaches approximately 160^OC, both power
switches will be turned off and the SW node will become
high impedance. To avoid the AME5252 from exceeding
the maximum junction temperature, the user will need to
do some thermal analysis. The goal of the thermal analy-
sis is to determine whether the power dissipated exceeds
the maximum junction temperature of the part. The tem-
perature rise is given by:
T_R = ( _PD)( θ_JA )
Where PD is the power dissipated by the regulator and
θ_JA is the thermal resistance from the junction of the die
to the ambient temperature.
12
Rev. C.01