Boost charge circuit for DC/DC converter

A voltage regulator circuit, comprising:

• a high-side drive circuit having a drive input, a drive output and a drive supply input, wherein the drive input is coupled to a high-side drive terminal;
• a boost charging circuit having a boost input and a boost output, wherein the boost input is coupled to an input voltage terminal, and the boost output is coupled to the drive supply input;
• and
• a high-side transistor having a high-side control terminal, wherein the high-side transistor is coupled between the input voltage terminal and a switch terminal, and the high-side control terminal is coupled to the drive output;
• wherein the boost charging circuit includes:
• a first transistor coupled between an input voltage terminal and a boost terminal and having a first control terminal;
• a second transistor coupled between the first control terminal and a switch terminal and having a second control terminal, wherein the second control terminal is coupled to the switch terminal;
• a capacitor coupled between the boost output and the switch terminal;
• and
• a third transistor having a third control terminal and first and second current terminals, wherein the third control terminal is coupled to an internal voltage supply terminal, and the first current terminal is coupled to the first control terminal.