VNI8200XP-32 datasheet(28/43 Pages) STMICROELECTRONICS

28 / 43 page

Step-down switching regulator

VNI8200XP-32

28/43

DocID027849 Rev 3

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 VREG 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 VREG, 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 VNI8200XP-32 inside the same board, it's possible

to configure the DC-DC converter on only one device and also supply the other ICs.

if the DC-DC converter is adjusted to provide 3.3 V regulation and the VDC_out is used to

power an external load and not the device, a 33 kΩ resistor has to be connected on V

DC_out

pin.

VNI8200XP-32 Datasheet(PDF) 28 Page - STMicroelectronics