Hi Team,
We are using LD1086DT33TR regulator to generate 3.3V output from 5V input, But the the maximum dropout voltage given in the datasheet is 1.5V.Our dropout voltage is 1.7V (5V - 3.3V =1.7V) which is exceeding the max dropout voltage of the IC mentioned in datasheet ,My question is whether this IC is suitable for our requirement or we need to look for alternative.
Regards
Tejas
Hi
Unfortunately, you are confusing a few parameters about LDOs (Low-Dropout Regulators): the dropout voltage is the difference between the input voltage and the output voltage. The LDO needs at least this dropout voltage to be able to regulate the output voltage. And for the LD1086 this minimum dropout voltage is typically 1.3V, but can go up to max 1.5V.
In the case of the LD1086DT33, the target output voltage is 3.3V, the input voltage according to your specification is 5V, which results in a voltage difference of 1.7V, which is easily above the required dropout voltage (1.7V > max 1.5V). In your case, the LD1086DT33 can regulate perfectly, even if the input voltage drops to 4.8V.
Clearer now?
Regards
/Peter
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