About TLV758P(Preview device), please let me know about recommended or reference value for feedback resistor divider (R1 and R2).
If no information, I think that R1 and R2 should calculate based on below application note, is it correct?
Best regards,
Satoshi
Hi Satoshi,
The upper bound of the resistor values is set by the feedback pin current specified in the Electrical Characteristics table. To simplify calculations, a good rule of thumb is to set the resistor divider current at least ten times higher than the maximum feedback pin current. For the TLV758P, this limits the total resistance (R1 + R2) in the resistor divider to Vout / (0.1 uA * 10). From the application note, this is the condition that reduces Equation 6 to Ohm's Law:
The lower bound is set by the maximum allowable power dissipation across the two resistors. This is calculated as P = Vout^2/(R1+R2). To ensure this power dissipation is negligible, resistors of at least 10 kOhms are recommended. In general, TI suggests using feedback resistances between 10 kOhms and 100 kOhms for LDOs. This allows for plenty of margin for the feedback pin current.
If your application requires larger feedback resistors, you can follow the procedure described in the application note to account for the feedback pin current and calculate R1 and R2.
Thanks,
Gerard
