STSPIN32F0 datasheet(22/40 Pages) STMICROELECTRONICS

22 / 40 page

Device description

STSPIN32F0

22/40

DocID029806 Rev 2

External optional 3.3 V supply voltage

It is possible provide externally the 3.3 V supply voltage directly on the VDDA pin. In this

case, there are two possible configurations:

The SW pin floating or shorted to VM: in this case the internal power switch of the

DC/DC converter continues to switch on/off according to the internal clock

The SW pin shorted to GND or VDD: in this case the internal power switch detects

a short-circuit and it is latched off.

Note:

It is not allowed to apply VDD voltage externally in case of VM < VDD.

6.3

Linear regulator

The internal 12 V linear regulator is a LDO regulator providing the supply voltage for the

gate drivers section. An external capacitor connected to the VREG12 pin is required.

Figure 9. Linear regulator block diagram

When the VM voltage is below to 12 V, the VM pin and the linear regulator output can be

shorted together providing the gate driver supply externally.

The linear regulator embeds a thermal protection as described in Section 6.1.2.

STSPIN32F0 Datasheet(PDF) 22 Page - STMicroelectronics