ZHCSF68D May 2015 – July 2019 DRV8305-Q1
PRODUCTION DATA.
The DRV8305-Q1 has two internal regulators, DVDD and AVDD, that power internal circuitry. These regulators cannot be used to drive external loads and may not be supplied externally.
DVDD is the voltage regulator for the internal logic circuits and is maintained at a value of 3.3 V through the entire operating range of the device. DVDD is derived from the PVDD power supply. DVDD should be bypassed externally with a 1-µF capacitor to GND.
AVDD is the voltage regulator that provides the voltage rail for the internal analog circuit blocks including the current sense amplifiers and is maintained at a value 5 V. AVDD is derived from the PVDD voltage power supply. AVDD should be bypassed externally with a 1-µF capacitor to GND.
Because the allowed PVDD operating range of the device permits operation below the nominal value of AVDD, this regulator operates in two regimes: namely a linear regulating regime and a dropout region. In the dropout region, the AVDD will simply track the PVDD voltage minus a voltage drop.
If the device is expected to operate within the dropout region, take care while selecting current sense amplifier components and settings to accommodate the reduced voltage rail.