Integrated battery charge regulation circuit based on power FET conductivity modulation

An integrated circuit, comprising:

• an input voltage terminal;
• a battery terminal;
• monitoring circuitry coupled to the battery terminal and configured to detect a transient fault condition of a battery charge operation of the integrated circuit;
• a power stage coupled between the input voltage terminal and the battery terminal, the power stage having a power switch;
• and
• a control circuit coupled between the monitoring circuitry and the power stage, the control circuit including:
• a first and second transconductance stage having respective outputs coupled to a control terminal;
• and
• a resistor coupled in series with a capacitor between the control terminal and a ground terminal;
• wherein:
• the control circuit configured to provide a control signal on the control terminal to adjust a conductivity of the power switch responsive to a detected transient fault condition;
• and
• the control signal is a function of the resistor, the capacitor, and the respective outputs of the first and second transconductance stages.

A battery charger integrated circuit, comprising:

• a first battery terminal;
• a second battery terminal;
• a control circuit having a first input and a second input, a first and second transconductance stage with respective outputs coupled to a control terminal;
• a resistor and a capacitor coupled in series between the control terminal and a ground terminal;
• a voltage sense circuit having first voltage sense input, a second voltage sense input, and a voltage sense output, the first voltage sense input coupled to the first battery terminal, the second voltage sense input coupled to the second battery terminal, and the voltage sense output coupled to the first input of the control circuit;
• a current sense circuit having a first current sense input, a second current sense input, and a current sense output, the first current sense input coupled to a first side of a sense resistor in series with the first battery terminal and the second battery terminal, the second current sense input coupled to a second side of the sense resistor, and the current sense output coupled to the second input of the control circuit;
• and
• a power stage with a power switch and a gate driver circuit for the power switch, the gate driver circuit coupled to an output of the control circuit,
• wherein the output of the control circuit is a function of the resistor, the capacitor, and the respective outputs of the first and second transconductance stages.