Component selection

AN4394

14/18

DocID025512 Rev 1

Considering that I = C

Equation 10

Thus:

Equation 11

4.3.3

UVP and EOC setting

The pins UVP and EOC have to be connected to the STORE pin by the resistor partitioning

R4, R5 and R6 to setup the related thresholds by scaling down those voltage values and by

comparing them with the internal voltage reference set at 1.23 V.

The design rules to setup the R4, R5 and R6 are the following:

Equation 12

Equation 13

Further, in order to minimize the leakage due to the output resistor partitioning it has to be

typically:

Equation 14

10 M

 ≤ R4 + R5 + R6 ≤ 20 M











-------------------------------------------------------------

–

=







–



------------------------------------------------------------------





R5 R6

+

R4 R5 R6

++

------------------------------------

=

R6

R4 R5 R6

++

------------------------------------

=