The MASTERGAN1 VCC supply voltage is continuously monitored by an under-voltage lockout (UVLO) circuitry

that turns both the high-side and low-side GaN transistors off when the supply voltage goes below the VCC_thOFF

threshold. The UVLO circuitry turns on the GaN, according to LIN and HIN status, as soon as the supply voltage

goes above the VCCthON voltage. A VCChys hysteresis is provided for noise rejection purpose.

Figure 16. VCC UVLO and Low Side

VCC = PVCC

VCCthON

VCCthOFF

UVLO VCC

0V

0V

VCC rise

LIN

GL-PGND

0V

PVCC

6.4

VBO UVLO protection

Dedicated undervoltage protection is available on the bootstrap section between BOOT and OUTb supply pins. In

order to avoid intermittent operation, a hysteresis sets the turn-off threshold with respect to the turn-on threshold.

When VBO voltage goes below VBOthOFF threshold the high-side GaN transistor is switched off. When VBO voltage

reaches VBOthON threshold the device returns to normal operation and the output remains off until the detection of

the HIN pin's rising edge, that activates the high side transistor's turn-on.

Figure 17. VBO UVLO and High Side

VCC

VCCthON

VCCthOFF

HIN

UVLO VBO

0V

0V

VBO rise

(GH-OUTB)

VBO

0V

VBOthON

VBOthOFF

0V

VBO

MASTERGAN1

VBO UVLO protection

DS13417 - Rev 3

page 16/27