Level shifter circuit

A circuit comprising:

• a latch having a set input, and a reset input;
• a slew detector having a terminal coupled to a power terminal, and an output, the slew detector configured to provide at the output a slew sense signal based on a rate of change of voltage on the power terminal;
• a first variable resistor coupled between the power terminal and the set input, the first variable resistor having a control input coupled to the output of the slew detector, the first variable resistor configured to change a resistance of the first variable resistor based on the slew sense signal;
• and
• a second variable resistor coupled between the power terminal and the reset input, the second variable resistor having a control input coupled to the output of the slew detector, the second variable resistor configured to change a resistance of the second variable resistor based on the slew sense signal.

A switching converter comprising:

• a high-side transistor having a first terminal coupled to an input voltage terminal, a second terminal coupled to a switching terminal, and a control terminal;
• a driver having an output coupled to the control terminal of the high-side transistor, the driver including a level shifter having a first output coupled to the output of the driver, and a second output, the level shifter including:
• a latch having a first latch output coupled to the output of the level shifter, a second latch output, a set input and a reset input, the latch configured to provide a first latch output signal at the first latch output, and provide a second latch output signal at the second latch output;
• a slew detector having a terminal coupled to a power terminal, and an output, the slew detector configured to provide, at the output of the slew detector, a slew sense signal based on a rate of change of voltage on the power terminal;
• a first variable resistor coupled between the power terminal and the set input, the first variable resistor having a first control input coupled to the output of the slew detector and a second control input coupled to the first output of the latch, the first variable resistor configured to change a resistance of the first variable resistor based on the slew sense signal and the first latch output signal;
• and
• a second variable resistor coupled between the power terminal and the reset input, the second variable resistor having a third control input coupled to the output of the slew detector and a fourth control input coupled to the second output of the latch, the second variable resistor configured to change a resistance of the second variable resistor based on the slew sense signal and the second latch output signal.