Automatically configurable dual regulator type circuits and methods

1. An automatically configurable dual regulator type circuit comprising:

a high-side switching device (HS-SD) coupled to a low-side switching device (LS-SD) at an output node; and

a control logic device that turns on the HS-SD to provide an output current to a user selected circuit configuration through the output node, turns off the HS-SD after a voltage fed back from an output terminal of the user selected circuit configuration exceeds a first threshold and sets a regulator type configuration mode based on the presence or absence of a flyback period at the output node after the HS-SD has been turned off,

wherein the HS-SD and the LS-SD are both used in one regulator type configuration mode, and

wherein the control logic device discharges the output user selected circuit configuration, after a predetermined delay of the voltage of the output terminal exceeding the first threshold, by turning on the LS-SD until the voltage of the output terminal falls below a second threshold.

2. The circuit of claim 1 , wherein the user selected circuit configuration comprises one of a switching regulator configuration that includes an inductor and a low dropout (LDO) regulator configuration that does not include an inductor.

3. The circuit of claim 1 , wherein the regulator type configuration mode is set to a switching regulator configuration if a flyback period is detected and a low dropout (LDO) regulator configuration if a flyback period is not detected.

4. The circuit of claim 3 , wherein a flyback period is detected if the voltage at the output node falls below the voltage at the output terminal due to current flowing through the body diode of the LS-SD and through an inductor in the user selected circuit configuration.

5. The circuit of claim 4 , further comprising a comparator that switches states if the voltage at the output node falls below the voltage at the output terminal.

6. The circuit of claim 5 , further comprising a latch that is latched by the control logic device to latch the state of the comparator during the absence or presence of a flyback period to set the regulator type configuration mode.

7. The circuit of claim 5 , wherein the control logic device discharges the output user selected circuit configuration, after a predetermined delay of the voltage of the output terminal exceeding the first threshold, by turning on the LS-SD until the voltage of the output terminal falls below a second threshold.

8. The circuit of claim 7 , wherein the comparator switches between comparing the voltage of the output terminal with the voltage at the output node during regulator type configuration mode determination and the second threshold during discharging.

9. The circuit of claim 1 , further comprising a diode coupled FET that is current mirror coupled with the HS-SD, the diode coupled FET being series coupled to a current source through a switch that switches on to turn on the diode coupled FET and the HS-SD and turns off to turn off the diode coupled FET and the HS-SD.

10. The circuit of claim 9 , further comprising:

a comparator that switches states if the voltage of the output node exceeds the first threshold, which is a predetermined voltage which should be smaller than an under voltage lockout (UVLO) of a circuit or a chip which is powered by the configurable dual regulator circuit to avoid false power up; and

a latch that is latched by the control logic device to latch the state of the comparator upon the voltage of the output node exceeding the first threshold, such that the latch turns the switch off to turn off the diode coupled FET and the HS-SD.

11. An integrated circuit chip comprising the following circuit:

an automatically configurable dual regulator type circuit comprising:

a high-side switching device (HS-SD) coupled to a low-side switching device (LS-SD) at an output node;

a control logic device that turns on the HS-SD to provide an output current to a user selected circuit configuration through the output node turns off the HS-SD after a voltage fed back from an output terminal of the user selected circuit configuration exceeds a first threshold and sets a regulator type configuration mode based on the presence or absence of a flyback period at the output node after the HS-SD has been turned off,

wherein the HS-SD and the LS-SD are both used in one regulator type configuration mode; and

further comprising means for turning on the LS-SD until the voltage of the output terminal falls below a second threshold to discharge the user selected circuit configuration after a predetermined delay of the voltage of the output terminal exceeding the first threshold.

12. The circuit of claim 11 , wherein the user selected circuit configuration comprises one of a switching regulator configuration that includes an inductor and a low dropout (LDO) regulator configuration that does not include an inductor and wherein the regulator type configuration mode is set to a switching regulator configuration if a flyback period is detected and an LDO regulator configuration if a flyback period is not detected.

13. The circuit of claim 12 , wherein a flyback period is detected if the voltage at the output node falls below the voltage at the output terminal due to current flowing through the body diode of the LS-SD and through an inductor in the user selected circuit configuration.