LMZ30606 with only ceramic capacitors

Noam Tziony

Other Parts Discussed in Thread: LMZ30606, LMZ30604

Hi,

Can I use the LMZ30606 (or LMZ30604) with only ceramic capacitors at the output?

For example:

For 1.2V output, TI suggest to use 47uF ceramic + 330uF POSCAP. I like to use 4x 100uF, X5R, 6.3V, 1206 ceramic capacitors instead.

By-the-way - the schematics shown in the EVB datasheet is very blurry...

Thanks,

Noam

over 11 years ago

0 J Arrigo over 11 years ago

TI__Mastermind 28020 points

The LMZ30606 can be used with only ceramics.

For 1.2Vout, only 147uF of ceramic is required. For improved transient response, additional polymer-tantalum bulk caps are recommended.

0 Noam Tziony over 11 years ago in reply to J Arrigo

Intellectual 340 points

You didn't answer my question...

I want to get the same transient performance. I'ved asked if I could use ceramic capacitors instead of the bulk poscap.

Let me re-phrase my example:

For 1.2V output, TI suggest to use 47uF ceramic + 330uF POSCAP.

I like to use 1x 100uF, X5R, 6.3V, 1206 instead of the 47uF ceramic TI suggested + additional 3x 100uF, X5R, 6.3V, 1206 instead of the 330uF POSCAP.

Thanks,

Noam

0 J Arrigo over 11 years ago in reply to Noam Tziony

TI__Mastermind 28020 points

Hi Noam,

You will not get the same transient response with ceramics as with the poly-tantalum. Also, improved stability when a combination of ceramic and poly-tantalum are used. I recommend using the POSCAP type capacitor when adding additional output caps above the minimum.

0 Noam Tziony over 11 years ago in reply to J Arrigo

Intellectual 340 points

Thanks,

Noam

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LMZ30606 with only ceramic capacitors