The LM5012-Q1 contains an internal linear regulator that is powered from VIN with a nominal output of 5 V, eliminating the need for an external capacitor to stabilize the linear regulator. The internal VCC regulator supplies current to internal circuit blocks including the non-synchronous FET driver and logic circuits. The input pin (VIN) can be connected directly to line voltages up to 100 V. As the power MOSFET has a low total gate charge, use a low bootstrap capacitor value to reduce the stress on the internal regulator. It is required to select a high-quality ceramic bootstrap capacitor with an effective value of 2.2-nF, 50-V X7R as specified in the Absolute Maximum Ratings. VCC does not have current limit protection, so selecting a higher value capacitance stresses the internal VCC regulator and can damage the device. A lower capacitance than required is not sufficient to drive the internal gate of the power MOSFET. An internal diode connects from the VCC regulator to the BST pin to replenish the charge in the high-side gate drive bootstrap capacitor when the SW voltage is low.