STSPIN32G4 datasheet(17/48 Pages) STMICROELECTRONICS

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Figure 7. VCC externally supplied (buck disabled)

Buck

reg.

COUT

VCC

5.1.1.1

Short-circuit protection

The regulator is protected against short-circuit of the SW pin. If this condition is detected, the regulator stops for a

tdisable,Buck time.

At the end of this period, the buck regulator restarts performing a soft-start.

Figure 8. VCC buck regulator short-circuit protection

tdisable,Buck

Short circuit

event

VCC,mean

tSS,Buck

5.1.1.2

Thermal protection

If the temperature of the buck converter circuitry exceeds the TSD threshold, it stops operating until the

temperature returns below the TSD - TSD(Hyst) level (auto-restart).

When the regulator returns operative, a soft-start is performed.

5.1.2

3.3 V linear regulator

The device integrates a low-drop linear regulator (LDO) to generate the 3.3 V supply starting from the REGIN

input voltage. The 3.3 V output voltage supplies both the gate driver logic and the microcontroller.

The LDO output current is limited, making the regulator protected against short-circuit and overload.

An undervoltage monitoring circuit is active on the 3.3 V supply which triggers a reset if the voltage falls below

VREG3V3(Off).

STSPIN32G4

Power management section

DS13630 - Rev 1

page 17/48

STSPIN32G4 Datasheet(PDF) 17 Page - STMicroelectronics