STSPIN32G4 datasheet(18/48 Pages) STMICROELECTRONICS

18 / 48 page

Four configurations are possible for the 3.3 V supply:

Internally generated via LDO with REGIN pin connected directly to the buck output VCC (Figure 9).

Internally generated via LDO with REGIN pin connected through a resistor to the buck output VCC

(Figure 10); with this configuration the power dissipation inside the device can be reduced.

Internally generated via LDO with REGIN pin connected to an external supply voltage in the range 15 V to

3.3 V (Figure 11).

Externally, provided with REGIN and REG3V3 connected (Figure 12). In this case it is possible to disconnect

or tie to ground VM or VCC while providing the 3.3 V supply. When VM is provided again the device restarts

from a power-up condition.

Figure 9. 3.3 V LDO regulator supplied through VCC

Buck

reg.

3.3 V

LDO

COUT

CDD

Figure 10. 3.3 V LDO regulator supplied through VCC (external resistor)

Buck

reg.

3.3 V

LDO

COUT

CDD

CREGIN

Figure 11. 3.3 V LDO regulator with external supply

Buck

reg.

3.3 V

LDO

(3.3 V to 15 V)

COUT

CDD

VREGIN

CREGIN

STSPIN32G4

Power management section

DS13630 - Rev 1

page 18/48

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