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LM337L: ESR requirement of LM337L

teritama
Expert 2185 points
Part Number: LM337L

Hi team.

Our customer wants to use this device with ceramic capacitors for area saving.

So they want the data of ESR requirement for device stability.

Do you have any data like that we can understand ESR stable region?

best regards. 

  • 0
    TI__Intellectual 1146 points

    Hi teritama,

    Unfortunately we could not find ESR data that pertains to the LM337L. This device was released almost 40 years ago. It was very likely designed, tested, and characterized for use with a tantalum capacitor.

    Ceramic capacitors likely have too little ESR to be used by themselves and achieve a stable output; however, you could add a small resistor in series with the capacitor to boost the ESR.

    If you choose to attempt a ceramic capacitor with a series resistor, it is highly recommended that when you prototype your application you perform your worst case transients for the regulator while observing the output. This is a simple way to check the stability of the linear regulator as described in the following application report:

    https://www.ti.com/lit/slva381