Output capacitor selection for LD1085D2M-R

hamzdmr · ‎2025-10-15

Edited by a ST moderator: Update the title and the content with the part number

Hi,
I'm using LD1085D2M-R regulator. There is no certain information about output capacitor ESR limit value for stabilization.

-Input : 5V

-Output : 4V @3A

-Desired Output Capacitors : 2x10uF 10V

Can we use Ceramic capacitors with additional series resistor? In this case what is required resistance value?

mƎALLEm · ‎2025-10-15

Hello,

What ST product are you using in your case?

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hamzdmr · ‎2025-10-16

Sorry mƎALLEm,

The IC we are going to use is LD1085D2M-R.

Best regards.

RobK1 · ‎2025-10-16

@hamzdmr wrote:
There is no certain information about output capacitor ESR limit value for stabilization.

There are two graphs, one for VO=1.8V and one for VO=12V. While the maximum ESR is quite different in both cases, the minimum is 0.08Ohms in both cases. That seems pretty certain to me.

AScha.3 · ‎2025-10-16

Hi.

> Input : 5V --> Output : 4V @3A

Anyway not possible...see dropout of LD..: about 1.25 V

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