DA6250.007

13 April, 2018

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Figure 14. Disabling buffer outputs after power down delay

CIN and COUT capacitor values

The external CIN and COUT capacitors must be low loss (low ESR) ceramic capacitors. Recommended

capacitors values are shown in the table 2.

Table 2. Recommended capacitor values

Capacitor

Nominal value

CIN

10

F

COUT

100nF

and boost DC/DC converter output capacitor (COUT). Thus the output ripple can be reduced by choosing output

capacitor value which is much larger relative to piezo capacitance value. However note that large output capacitor

also lengthens output voltage rise time.