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TPS561201: Inductor type; Chip-style 0805 SMT vs Wire-wound

Ev Zin
Prodigy 50 points
Part Number: TPS561201

Hello,

I was wondering what the pros and cons are of using an SMT chip-style inductor for the output of the voltage regulator instead of the typical wire-wound power inductor. The 0805 chip-style inductor is way cheaper but I have always associated this style inductor with filtering, not power supply desing. But I am wondering if the power supply spec is low enough, if the chip-style can be used.

Application:  Vin = 12V;  Vout = 3.3V;  Iout(max) = 130mA;   Iout(typical) = 80mA

The chip-style 0805 SMT inductor I am looking at is     TDK  MLZ2012M100WT000

All of the electrical specs are fine for my application but I am not sure if there is some reason these should not be used for SMPS designs. This one is even shielded.

This is the wire-wound inductor I am looking at alternatively (which has higher power properties that are way overkill)   TDK  VLS252012HBX-100M-1

Thank you!

Ev

  • 0
    TI__Expert 4795 points

    Hi,

    SMT inductor usually has larger Rdson and lower Isat, which is not suitable for high current applications. But on the other hand, it's small size and is shielded, which makes it even has better performance on EMI side. Which one to choose depends on the operating conditions and what's the applications care about.