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droput voltage for LDL1117

ves011
Associate

I just bought 10 pcs of LDL1117S33R which i plan to use them to power 3.3V modules form a 4V regulated source.

According to the data sheet the typical dropout is 350mV and max is 600mV @1.2A. My module consumes less than 500mA, so i expect to have enough margin with a Vin of 4V to get 3.3V at the ouput. But the module doesnt boot at 4V input.

When measured the dropuout is 1V -  1.1V. Did anybody face this problem?

The chips are labeled LL33 F329 with ST logo

11 REPLIES 11

@Peter BENSCH 

Yep! RFM :)

Will look into LD39100PU33R

In fact the typical/max 350/600mV dropout is for marketing purpose. The real value is 1V, right? :)

Screenshot 2024-11-27 182916.png