Microcontroller and associated power management unit

1 . An integrated circuit, comprising:

a first terminal configured to be coupled to a battery;

second, third, and fourth terminals;

a power converter comprising:

a first transistor having a control terminal, and first and second current path terminals;

a second transistor having a control terminal, and first and second current path terminals;

a third transistor having a control terminal, and first and second current path terminals; and

a fourth transistor having a control terminal, and first and second current path terminals; and

a controller configured to control the power converter;

wherein the second current path terminal of the first transistor is coupled to the first terminal, the second current path terminal of the second transistor, the first current path terminal of the third transistor, and the first current path terminal of the fourth transistor;

wherein the second current path terminal of the third transistor is coupled to the second terminal of the integrated circuit;

wherein the second current path terminal of the fourth transistor is coupled to the third terminal of the integrated circuit; and

wherein the controller is coupled to the fourth terminal of the integrated circuit.

2 . The integrated circuit of claim 1 , further comprising reference voltage circuitry, a first voltage regulator, and a second voltage regulator, wherein:

the reference voltage circuitry is coupled to the second current path terminal of the third transistor, the second terminal of the integrated circuit, and the first voltage regulator;

the first voltage regulator is coupled to the second terminal of the integrated circuit, the reference voltage circuitry, and the third terminal of the integrated circuit; and

the second voltage regulator is coupled to the third terminal of the integrated circuit, the fourth terminal of the integrated circuit, and the controller.

3 . The integrated circuit of claim 1 , wherein the control terminals of the first, second, third, and fourth transistors of the power converter are coupled to receive sets of inputs from the controller, wherein, based on receiving a first set of inputs at the control terminals of the first, second, third, and fourth transistors, the power converter is configured to operate in a first mode, and wherein, based on receiving a second set of inputs at the control terminals of the first, second, third, and fourth transistors, the power converter is configured to operate in a second mode.

4 . The integrated circuit of claim 3 , wherein the power converter is configured to receive a battery voltage from the first terminal of the integrated circuit, and wherein, in the first mode, the power converter is configured to output, based on the battery voltage, a first voltage at the second terminal of the integrated circuit during a first time interval and a second voltage at the third terminal of the integrated circuit during a second time interval.

5 . The integrated circuit of claim 4 , wherein, to control the power converter, the controller is configured to:

compare the battery voltage to a first threshold voltage; and

in response to the battery voltage falling below the first threshold voltage, decrease a duration of the second time interval.

6 . The integrated circuit of claim 4 , wherein, to control the power converter, the controller is configured to:

compare the second voltage to a second threshold voltage; and

in response to the second voltage exceeding the second threshold voltage, decrease a duration of the second time interval.

7 . The integrated of claim 6 , wherein, to control the power converter, the controller is configured to:

compare the second voltage to the second threshold voltage; and

in response to the second voltage falling below the second threshold voltage, increase a duration of the second time interval.

8 . The integrated circuit of claim 7 , wherein, to control the power converter, the controller is configured to adjust a duration of the first time interval based on the increased or decreased duration of the second time interval.

9 . The integrated circuit of claim 4 , wherein, in the second mode, the power converter is configured to charge an inductor during a third time interval, wherein the inductor is configured to couple to the first terminal of the integrated circuit, the second current path terminal of the first transistor, the second current path terminal of the second transistor, the first current path terminal of the third transistor, and the first current path terminal of the fourth transistor.

10 . The integrated circuit of claim 9 , wherein the first time interval, the second time interval, and the third time interval include different, sequential intervals of time.

11 . The integrated circuit of claim 10 , wherein, to control the power converter, the controller is configured to:

compare the battery voltage to a first threshold voltage; and

in response to the battery voltage falling below the first threshold voltage, disable the power converter during a fourth time interval.

12 . The integrated circuit of claim 11 , wherein the fourth time interval includes an interval of time after the second time interval and before the third time interval.

13 . The integrated circuit of claim 12 , wherein the first mode includes a single-input-multiple-output (SIMO) mode, and wherein the second mode includes a boost mode.

14 . An integrated circuit, comprising:

first, second, third, and fourth terminals;

a power converter comprising:

a first transistor having a control terminal, and first and second current path terminals;

a second transistor having a control terminal, and first and second current path terminals;

a third transistor having a control terminal, and first and second current path terminals; and

a fourth transistor having a control terminal, and first and second current path terminals; and

a controller configured to control the power converter;

wherein the first terminal is coupled to a ground node;

wherein the second terminal is configured to be coupled to a battery;

wherein the second current path terminal of the first transistor is coupled to the third terminal, to the second current path terminal of the second transistor, to the first current path terminal of the third transistor, and to the first current path terminal of the fourth transistor;

wherein the second current path terminal of the third transistor is coupled to the second terminal;

wherein the second current path terminal of the fourth transistor is coupled to the third terminal; and

wherein the controller is coupled to the fourth terminal and to the first terminal.

15 . The integrated circuit of claim 14 , further comprising reference voltage circuitry, a first voltage regulator, and a second voltage regulator, wherein:

the reference voltage circuitry is coupled to the second current path terminal of the third transistor, the second terminal of the integrated circuit, and the first voltage regulator;

the first voltage regulator is coupled to the second terminal of the integrated circuit, the reference voltage circuitry, and the third terminal of the integrated circuit; and

the second voltage regulator is coupled to the third terminal of the integrated circuit, the fourth terminal of the integrated circuit, and the controller.

16 . The integrated circuit of claim 15 , wherein the control terminals of the first, second, third, and fourth transistors of the power converter are coupled to receive sets of inputs from the controller, wherein, based on receiving a first set of inputs at the control terminals of the first, second, third, and fourth transistors, the power converter is configured to operate in a first mode, and wherein, based on receiving a second set of inputs at the control terminals of the first, second, third, and fourth transistors, the power converter is configured to operate in a second mode.

17 . The integrated circuit of claim 3 , wherein the power converter is configured to receive a battery voltage from the second terminal of the integrated circuit, and wherein:

in the first mode, the power converter is configured to output, based on the battery voltage, a first voltage at the second terminal during a first time interval and a second voltage at the third terminal of the integrated circuit during a second time interval;

in the second mode, the power converter is configured to charge an inductor during a third time interval; and

the inductor is configured to couple to the third terminal, the second current path terminal of the first transistor, the second current path terminal of the second transistor, the first current path terminal of the third transistor, and the first current path terminal of the fourth transistor.

18 . A system, comprising:

a first terminal configured to be coupled to a battery;

second, third, and fourth terminals;

a power converter comprising:

a first transistor having a control terminal, and first and second current path terminals;

a second transistor having a control terminal, and first and second current path terminals;

a third transistor having a control terminal, and first and second current path terminals; and

a fourth transistor having a control terminal, and first and second current path terminals;

a controller configured to control the power converter;

an inductor coupled to the first terminal;

a first capacitor;

a second capacitor; and

a third capacitor;

wherein the second current path terminal of the first transistor is coupled to the inductor, the second current path terminal of the second transistor, the first current path terminal of the third transistor, and the first current path terminal of the fourth transistor;

wherein the second current path terminal of the third transistor is coupled to the second terminal;

wherein the first capacitor is coupled to the second terminal;

wherein the second current path terminal of the fourth transistor is coupled to the third terminal;

wherein the second capacitor is coupled to the third terminal;

wherein the controller is coupled to the fourth terminal and to the first terminal; and

wherein the third capacitor is coupled to the fourth terminal.

19 . The system of claim 18 , further comprising reference voltage circuitry, a first voltage regulator, and a second voltage regulator, wherein:

the reference voltage circuitry is coupled to the second current path terminal of the third transistor, the second terminal of the system, and the first voltage regulator;

the first voltage regulator is coupled to the second terminal, the reference voltage circuitry, and the third terminal of the system; and

the second voltage regulator is coupled to the third terminal, the fourth terminal of the system, and the controller.

20 . The system of claim 19 , wherein the control terminals of the first, second, third, and fourth transistors of the power converter are coupled to receive sets of inputs from the controller, wherein, based on receiving a first set of inputs at the control terminals of the first, second, third, and fourth transistors, the power converter is configured to operate in a first mode, and wherein, based on receiving a second set of inputs at the control terminals of the first, second, third, and fourth transistors, the power converter is configured to operate in a second mode.