External component selection

AN3319

18/25

DocID18265 Rev 8

R

5

is a 0

Ω pull-up resistor shorting the XSHUT and MPP-SET pins.

Removing R5 enables the external control of the XSHUT pin to turn the SPV1040 on/off.

6.1

Optional Schottky

An external Schottky diode between L

x

and V

OUT

pins is mandatory in all the applications

with V

BATT_max

> 4.8 V.

In fact, voltage on L

x

pin can go above the maximum absolute voltage threshold (5.5 V) due

to the voltage drop on the high side integrated switch when this is off (discontinuous mode)

and current needs to flow from input to output.

This Schottky diode should be chosen according to the following criteria:

For setting up the application and simulating the related test results please go to

www.st.com/edesignstudio.

V

F

5.5 V

≤

BATT_max

and

I

F

I

≥

Lmax

V

-