Test setup and performance summary

AN2565

16/29

10

Test setup and performance summary

10.1

Test setup

The PM6680A evaluation board has the following input/output connections:

– 3.3 V SMPS output through J4-J13 (OUT1+ and OUT1-)

– 1.8 V SMPS output through J1-J12 (OUT2+ and OUT2-)

– 5 V linear regulator output through J3 (LDO5)

Figure 7.

Test setup connections

active loads should be connected respectively to OUT1+, OUT1- and OUT2+, OUT2-.

10.2

Power-up

As shown in Figure 8, the power-up starts when the input voltage is applied and the voltage

on the SHDN pin is above the device “on” threshold. First, the LDO5 goes up with a masking

time of about 4 ms.