The PVCC pin can be connected either to the same supply voltage of the VCC pin or to a separate voltage

source. In case the same voltage source is used, it is suggested to connect VCC and PVCC pins by means of

a small decoupling resistance. The use of dedicated bypass ceramic capacitors located as close as possible to

each supply pin is highly recommended.

The MASTERGAN2 VCC supply voltage is continuously monitored by 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, approximately 20 µs (typ)

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

purposes.

Figure 26. VCC UVLO and Low Side

VCC = PVCC

VCCthON

VCCthOFF

UVLO VCC

0V

0V

VCC rise

Tdelay_VCC

Tdelay_VCC

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.

Approximately 5 µs (typ) after VBO voltage falls below VBOthOFF threshold, the high-side GaN transistor is

switched off. When VBO voltage reaches the VBOthON threshold, the device returns to normal operation and the

output remains off until the next input pin transition that requests the high-side to turn on.

Figure 27. VBO UVLO and High Side

VCC

VCCthON

VCCthOFF

HIN

UVLO VBO

0V

0V

VBO rise

(GH-OUTB)

VBO

0V

VBOthON

VBOthOFF

0V

VBO

MASTERGAN2

VBO UVLO protection

DS13597 - Rev 2.0

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