Datasheet

0 25 50 75 100 125
0.0
0.2
0.4
0.6
0.8
1.0
1.2
MAXIMUM I
OUT
(A)
AMBIENT TEMPERATURE (°C)
LMR24210
SNVS738G –OCTOBER 2011–REVISED APRIL 2013 www.ti.com
Thermal Derating
Temperature rise increases with frequency, load current, input voltage and smaller board dimensions. On a
typical board, the LMR24210 is capable of supplying 1A below an ambient temperature of 90°C under worst case
operation with input voltage of 42V. Figure 23 shows a thermal derating curve for the output current without
thermal shutdown against ambient temperature up to 125°C. Obtaining 1A output current is possible at higher
temperature by increasing the PCB ground plane area, adding airflow or reducing the input voltage or operating
frequency.
θ
JA
=40°C/W, Vo = 3.3V, fs = 500kHz
(tested on the evaluation board)
Figure 23. Thermal Derating Curve
14 Submit Documentation Feedback Copyright © 2011–2013, Texas Instruments Incorporated
Product Folder Links: LMR24210