Datasheet

DocID15234 Rev 6 27/40
VNI8200XP Step-down switching regulator
12 Step-down switching regulator
The IC embeds a high efficiency 100 mA micropower step-down switching regulator. The
regulator is protected against short-circuit or overload conditions. Pulse-by-pulse current
limit regulation is obtained in normal operation through a current loop control.
A low ESR output capacitor connected to the V
REG pin
helps to limit the regulated voltage
ripple; a low ESR (less than 10 mΩ) capacitor is preferable. The control loop pin FB allows
3.3 V to be regulated, connecting it directly to V
REG
, or 5 V connecting it through a voltage
divider Rl/Rfbl. The DC-DC converter can be turned off by connecting the feedback pin to
the DCVDD pin. In some applications it is possible to supply a 5 V or 3.3 V voltage
externally or, in the case of two or more VNI8200XPs inside the same board, it's possible to
configure the DC-DC converter on only one device and supply also the other ICs.
Note: if the DC-DC converter is adjusted to provide 3.3 V regulation and the V
dc_out
is used to
power an external load and not the device, a 33 k
Ω resistor has to be connected on
Vdc_out pin.