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TPS7A45: Output Capacitor Tantalum vs Ceramic & Input Capacitor package footprint.

AMARENDRA NATH PRAMANIK
Prodigy 20 points
Part Number: TPS7A45

TPS7A45xxEVM-385 evaluation module (EVM) sharing same characteristics in case of i/p C1 and o/p C2 capacitor, however their packages are 1210 & 1206. Is there any specific reason behind this reference architecture? As you know the package footprint of 1210 little bigger. Can I use same package as 1206 for C1 as well. Another points, my specific application has requirement of 700 mA to powerup the ESP 07S module + as well as Li-po charging module + sensors. I am using the LDO TPS7A4533 to regulate HLK - PM01 +5v (600mA) to +3V3. Is it possible to use 47uF Tantalum capacitor as C2 or GRM31CR61E226KE15L - SMD Multilayer Ceramic Capacitor, 22 µF, 25 V, 1206 [3216 Metric], ± 10%, X5R, GRM Series. Which one will be best fit for my specific case.

Regards,

Amarendra

  • 0
    TI__Genius 12511 points

    Hi Amarendra,

    There is no issue with utilizing a different form factor from the LDO point of view. The options for selecting this specifically are unknown and were done in 2012. Utilizing same size input/output is general best practice now, but looks like was not implemented at the time. Generally speaking we recommend MLCC caps. The tantalum capacitor will be sufficient if the ESR is < 3 Ω. Otherwise we would recommend the MLCC instead. However if strong transients are expected then larger capacitance is better.

    Regards,

    John