13.11 Bootstrap Supply (V_BOOT)

Bootstrap Supply voltage regulator output. The V_BOOT regulator output may be used to power external devices, such as Hall effect sensors or amplifiers. The regulator output requires an output capacitor for stability. The positive side of the output capacitor should be physically located as close to the V_BOOT pin as is practical. A minimum capacitance of 4.7 µF is required to ensure stable operation of the V_BOOT circuit. Larger capacitances may be used to increase transient performance. The V_BOOT regulator is supplied by the internal charge pump when the charge pump is active. When the charge pump is inactive, the V_BOOT regulator is supplied by HV_DD.

The type of capacitor used may be ceramic, tantalum or aluminum electrolytic. The low-ESR characteristics of the ceramic will yield better noise and PSRR performance at high frequency.