KR101737263B1 - SIMO converter with fast response and accurate output voltage - Google Patents

SIMO converter with fast response and accurate output voltage Download PDF

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Publication number
KR101737263B1
KR101737263B1 KR1020160010171A KR20160010171A KR101737263B1 KR 101737263 B1 KR101737263 B1 KR 101737263B1 KR 1020160010171 A KR1020160010171 A KR 1020160010171A KR 20160010171 A KR20160010171 A KR 20160010171A KR 101737263 B1 KR101737263 B1 KR 101737263B1
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South Korea
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switch
time
inductor
period
end connected
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KR1020160010171A
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Korean (ko)
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유창식
박정표
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한양대학교 산학협력단
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/08—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
    • H02M2001/0083—
    • H02M2001/009—

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

A SIMO converter having a fast response characteristic and an accurate output voltage is disclosed. The disclosed SIMO converter includes one inductor connected to a power supply; A first switch having one end connected to the power source and the other end connected to one end of the inductor, a second switch having one end connected to one end of the first switch and one end of the inductor and the other end connected to ground, A third switch having one end connected to the other end of the inductor and the other end connected to the second load, and a fourth switch having one end connected to one end of the inductor and the other end connected to the other end of the inductor, And a fifth switch connected to the other end of the inductor, the plurality of switches operating periodically, the period including a first time, a second time, a third time, and a fourth time Wherein in each of the periods, the first switch is turned on at the first time, the second time and the third time, and the third switch is turned on at the first time and the fourth time It can be turned on.

Description

Technical Field [0001] The present invention relates to a SIMO converter having a fast response characteristic and an accurate output voltage,

Embodiments of the present invention relate to a DC-DC converter that uses a single inductor to supply a plurality of output voltages, and more particularly, to a single-ended multiple converter (SIMO) converter having a fast response characteristic and an accurate output voltage. will be.

A DC-DC converter, ie, a SIMO (Single Inductor Multiple Output) converter, which supplies multiple output voltages to a single inductor, is in increasing demand as the size of the mobile device becomes smaller.

The SIMO converter compares the state of the output voltage with a comparator for fast response and small form factor to determine whether the converter has enough energy or not, And a hysteresis control method that stably regulates the output voltage is used.

On the other hand, the conventional SIMO converter transfers energy sequentially from the first output voltage at the time when the inductor current is low, and transfers energy at all the outputs within one period. However, in the case of the prior art, the error can not be accurately determined in the state where excessive energy is transferred to the SIMO converter, so that the accuracy of the final output voltage is lowered, and there is a possibility that the converter may malfunction according to the hysteresis boundary .

More specifically, FIG. 1 is a diagram showing a schematic structure of a conventional SIMO converter, and FIG. 2 is a diagram showing an operation waveform of a conventional SIMO converter. 1 and 2 show the structure and operation waveform of a SIDO (Single Inductor Dual Output) converter that outputs two output voltages among the SIMO converters.

1 and 2, the first output, that is, the output for the voltage (V O1 ) of the load 1 is charged at the time point when the switch S H is turned on, that is, the current of the inductor becomes minimum, When V O1) reaches the upper limit value of the first reference voltage (V HYS _ T1) to charge the second output voltage (V O2). And the end of the energy transfer when the second output voltage (V O2) reaches the upper limit value of the second reference voltage (V HYS _ T2).

On the other hand, excessive energy may be transferred to the SIMO converter. FIG. 3 shows an operation waveform in a situation where excessive energy is transferred in a conventional SIMO converter.

3, after the SIMO converter has fully charged the second output voltage V O2 , the switch S f (Φ DN ) is turned on and V PWM is turned on for the time S f (Φ DN ) Lowering the energy delivered to the SIMO converter.

However, in the excessive charge that is indicative of excessive energy delivered to the SIMO converter, the second output voltage (V O2 ) rises and T ex Over time, excessive energy is delivered to the actual SIMO converter. Since the conventional SIMO converter lowers V PWM during the time that the switch S f is turned on, not the T ex time, it causes the accuracy of the output voltage to be lowered by lowering the V PWM for a time longer than the actual necessary time.

In order to solve the problems of the prior art as described above, the present invention proposes a SIMO (Single Inductor Multiple Converter) converter having a fast response characteristic and an accurate output voltage.

Other objects of the invention will be apparent to those skilled in the art from the following examples.

In order to accomplish the above object, according to a preferred embodiment of the present invention, there is provided an inductor comprising: an inductor connected to a power source; A first switch having one end connected to the power source and the other end connected to one end of the inductor, a second switch having one end connected to one end of the first switch and one end of the inductor and the other end connected to ground, A third switch having one end connected to the other end of the inductor and the other end connected to the second load, and a fourth switch having one end connected to one end of the inductor and the other end connected to the other end of the inductor, And a fifth switch connected to the other end of the inductor, the plurality of switches operating periodically, the period including a first time, a second time, a third time, and a fourth time Wherein in each of the periods, the first switch is turned on at the first time, the second time and the third time, and the third switch is turned on at the first time and the fourth time A SIMO converter is provided.

The second switch may be turned on at the fourth time, and the fourth switch may be turned on at the second time.

And the fifth switch may be turned on at the third time.

And a controller for controlling on / off of the plurality of switches.

According to another embodiment of the present invention, there is provided an inductor including: an inductor connected to a power source; A first switch having one end connected to the power source and the other end connected to one end of the inductor, a second switch having one end connected to one end of the first switch and one end of the inductor and the other end connected to ground, A third switch connected to the other end of the inductor and having the other end connected to the first load, and a fourth switch having one end connected to the other end of the inductor and the other end connected to the second load; Wherein the fourth switch comprises a transistor and the fourth switch comprises a parasitic diode, the input terminal of the parasitic diode being connected to the other end of the inductor and one end of the fourth switch, An output terminal of the diode is connected to the power source and one end of the first switch, and the period is divided into a first time, a second time, Wherein the first switch is turned on at the first time, the second time and the third time, and the third switch is turned on at the first time and the third time, RTI ID = 0.0 > SIMO < / RTI > converter is provided.

The SIMO converter according to the present invention has an advantage of having a quick response characteristic and an accurate output voltage.

1 is a diagram showing a schematic structure of a conventional SIMO converter.
2 is a diagram showing an operation waveform of a conventional SIMO converter.
FIG. 3 is a diagram showing an operation waveform in a state where excessive energy is transferred in a conventional SIMO converter.
4 is a diagram showing a schematic configuration of a SIMO converter according to the first embodiment of the present invention.
5 is a diagram showing an operation waveform of the SIMO converter according to the first embodiment of the present invention.
6 is a diagram showing a schematic configuration of a SIMO converter according to a second embodiment of the present invention.
7 is a view showing an operation waveform of the SIMO converter according to the second embodiment of the present invention when the SIMO converter is in a steady state.
8 is a diagram showing an operation waveform when the SIMO converter 600 according to the second embodiment of the present invention is in a transient state.

As used herein, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. In this specification, the terms "comprising ", or" comprising "and the like should not be construed as necessarily including the various elements or steps described in the specification, Or may be further comprised of additional components or steps. Also, the terms "part," " module, "and the like described in the specification mean units for processing at least one function or operation, which may be implemented in hardware or software or a combination of hardware and software .

Various embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

4 is a diagram showing a schematic configuration of a SIMO (Single Inductor Multiple Converter) converter according to the first embodiment of the present invention.

Referring to FIG. 4, the SIMO converter 400 according to the first embodiment of the present invention is a DC-DC converter including one inductor L, a plurality of switches S H , S L , S f , S O1 , S O2 ) and a control unit 410.

5 is a diagram showing an operation waveform of the SIMO converter 400 according to the first embodiment of the present invention.

Hereinafter, the function of each component will be described in detail with reference to FIG. 4 and FIG. 5. FIG.

An inductor (L) is connected and the power supply (V in), and stores the charge output from the power source (V in).

The plurality of switches S H , S L , S O1 , S O2 and S f are connected in series between the charges output from the power source V in to supply power to the first load 420 and the second load 430, And transfers the charge stored in the inductor L to the first load 420 and the second load 430. [ At this time, the plurality of switches S H , S L , S O1 , S O2 , and S f can operate periodically.

The control unit 410 controls on / off of the plurality of switches S H , S L , S O1 , S O2 , and S f . To this end, the control unit 410 generates and outputs control signals for the respective switches.

More specifically, the plurality of switches S H , S L , S O1 , S O2 , and S f are five switches, that is, a first switch S H , a second switch S L , includes O1), the fourth switch (S O2) and fifth switches (S f).

The first switch S H has one end connected to the power source V in and the other end connected to one end of the inductor L. That is, the first switch S H is a switch for connecting the power source V in and the inductor L.

The second switch S L has one end connected to the other end of the first switch S L and one end of the inductor L and the other end connected to the ground. That is, the second switch S L is a switch for connection between the ground and the inductor L.

The third switch S O1 has one end connected to the other end of the inductor L and the other end connected to the first load 420. That is, the third switch S O1 is a switch for connecting the inductor L and the first load 420.

The fourth switch S O2 has one end connected to the other end of the inductor L and the other end connected to the second load 430. That is, the fourth switch S 0 2 is a switch for connecting the inductor L and the second load 430.

The fifth switch S f has one end connected to one end of the inductor L and the other end connected to the other end of the inductor L. That is, the fifth switch S f is a freewheel switch for the inductor L.

At this time, the periods of the plurality of switches S H , S L , S O1 , S O2 and S f are set to the first time T1, the second time T2, the third time T3, And a fourth time T4. That is, the first time T1, the second time T2, the third time T3, and the fourth time T4 may come in time sequence.

Hereinafter, the on / off operation of the plurality of switches S H , S L , S O1 , S O2 and S f according to the present invention will be described in detail.

The first switch S H may be turned on at the first time T1, the second time T2 and the third time T3 and turned off at the fourth time T4. Then, the second switch S L is turned on at the fourth time T4, and can be turned off at the first time T1, the second time T2, and the third time T3. Also, the third switch SO1 may be turned on at the first time T1 and the fourth time T4, and turned off at the second time T2 and the third time T3. The fourth switch SO2 is turned on at the second time T2 and can be turned off at the first time T1, the third time T3 and the fourth time T4. Also, the fifth switch S f is turned on at the third time T3, and can be turned off at the first time T1, the second time T2, and the fourth time T4. On the other hand, in each cycle, the period of the first time T1, the period of the second time T2, the period of the third time T3, and the period of the fourth time T4 may be different.

In summary, the SIMO converter 400 according to the first embodiment of the present invention is designed to lower the pulse width control voltage used for controlling the converter, that is, V PWM during T ex , when excess energy is generated, The control unit 410 operates to control on / off of the plurality of switches S H , S L , S O1 , S O2 and S f as described above.

Specifically, the SIMO converter 400 charges the first output voltage V O1 sequentially from the maximum value of the current of the inductor L, not from the minimum value of the inductor L current. That is, the control unit 410 controls the third switch S O1 to be turned on at the falling edge of the first switch S H to start charging from the maximum value of the current of the inductor L, and the second output voltage V O2 ) from the completion of the energy transfer until the next second switch S L is turned on, the on time of the fifth switch S f becomes equal to T ex . Therefore, there is an advantage in that the accuracy of the output voltage of the converter is lowered and the possibility of malfunction of the converter is eliminated.

6 is a diagram showing a schematic configuration of a SIMO converter according to a second embodiment of the present invention.

6, the SIMO converter 600 according to the second embodiment of the present invention includes one inductor L, a plurality of switches S H , S L , S O1 , S O2 , and a control unit 610 .

7 is a view showing an operation waveform when the SIMO converter 600 according to the second embodiment of the present invention is in a steady state, and FIG. 8 is a view showing a SIMO converter 600 according to the second embodiment of the present invention. In the transient state of FIG.

Hereinafter, functions of the respective components will be described in detail with reference to FIGS. 6 to 8. FIG.

Inductor 610 is connected with the power source (V in), and stores the charge output from the power source (V in).

A plurality of switches (S H, S L, S O1, S O2) is the electric charge and the inductor output from the power source (V in) for applying a supply voltage to a first load 620 and second load 620 ( 610 to the first load 620 and the second load 630. The first load 620 and the second load 630 are connected to each other. At this time, the plurality of switches S H , S L , S O1 , and S O2 can operate periodically.

The control unit 610 controls on / off of the plurality of switches S H , S L , S O1 , and S O2 . To this end, the controller 610 generates and outputs control signals for the respective switches.

More specifically, the plurality of switches S H , S L , S O1 , and S O2 include four switches, namely, a first switch S H , a second switch S L , a third switch S O1 , And a fourth switch ( So2 ). At this time, each of the plurality of switches (S H, S L, S O1, S O2) may be configured to include a transistor, in particular, the third switch (S O1) and fourth switches (S O2) is a PMOS transistor Lt; / RTI > The first switch S H , the second switch S L , the third switch S O1 and the fourth switch S O2 are connected to the first switch SW1 of the SIMO converter 400 according to the first embodiment S H , the second switch S L , the third switch S O1 , and the fourth switch S O2 .

That is, in comparison with the SIMO converter 400 according to the first embodiment, the SIMO converter 600 according to the second embodiment does not have the fifth switch S f , and the third switch S O1 is configured The parasitic diode (D P ) of the transistor can perform the role of the fifth switch S f .

That is, the parasitic diode D P can function as a freewheel switch. The input terminal of the parasitic diode D P is connected to the other terminal of the inductor L and one end of the fourth switch S O2 and the output terminal of the parasitic diode D P is connected to the power source V IN and the first switch S H ).

At this time, the cycle may be composed of a first time (T1), a second time (T2), a third time (T3) and a fourth time (T4) according to the flow of time. The first switch S H , the second switch S L , the third switch S O1 and the fourth switch S O2 according to the second embodiment of the present invention are similar to the first embodiment The first switch S H , the second switch S L , the third switch S O1 and the fourth switch S O2 in accordance with the first switch SW1.

The parasitic diode D P is operable to flow a current at the third time T3 without flowing current at the first time T1, second time T2 and fourth time T4 have.

To this end, the controller 610 controls the voltage V O1 of the first load, the voltage V O2 of the second load, the upper limit V HYS of the first reference voltage for controlling the voltage V O1 of the first load, _ T1) and a lower limit (V HYS _B1), a second reference voltage upper limit value for controlling the voltage (V O2) of the load (V HYS _ T2) and a lower limit (V HYS _B2) a pulse width control method using A control signal for controlling the plurality of switches S H , S L , S O1 , and S O2 can be generated.

In more detail, the control unit 610 includes a logic control unit 611, an error accumulation circuit 612, a dead-time control & buffer unit 613, Flop 614 and a first D flip-flop 615 (with Q = LOW under all conditions when reset becomes HIGH) with the addition of a reset function.

Logic control means 611 is the voltage (V O1) of the first load, the second voltage (V O2), the upper limit value of the first reference voltage of the load (V HYS _ T1), the second reference voltage upper limit value of (V HYS _ T2), and receives an output value (V H) of the first D flip-flop 615, by using this, hayeoteul voltage (V O1) of the first load reaches the upper limit value of the first reference voltage (V HYS _ T1) a first pulse (V O1R), a second pulse (V O2R) occurring when the voltage (V O2) of the second load has reached the second upper limit value of the reference voltage (V HYS _ T2), the first load that occurs when Which means that the voltage output of the SIMO converter 600 for one period, that is, the first output and the second output, are all completed, and a third pulse? S indicating the start of charging of the output of the voltage (V END), the signal for charging the first output voltage (V O1) a first input signal (V PH1), the second output of the input signal (V PH2) signal to charge the second output voltage (V O2) do.

That is, the logic control means 611 generates the third pulse? S at the falling edge of the output value V H of the first D flip-flop 615 to charge the first output voltage V O1 . The first output voltage (V O1) is increased to the upper limit value of the first reference voltage (V HYS _ T1) and meet, the charge of the first pulse (V O1R) is at a high value is the (HIGH) the first output voltage (V O1) And simultaneously starts charging the second output voltage (V O2 ). The second output voltage (V O2) is increased to the upper limit value of the second reference voltage (V HYS _ T2) and meeting a second pulse (V O2R) is or is HIGH when the third pulse (Φ S) of the next cycle generator 4 A pulse (V END ) is generated.

Error accumulation circuit 612 is the voltage (V O1), the voltage of the second load (V O2), a first reference voltage lower limit value of (V HYS _B1), a second reference voltage lower limit value of (V HYS _B2) of the first load The first pulse V O1R , the second pulse V O2R , the third pulse? S and the fourth pulse V END and outputs the pulse width control voltage V PWM . 6 (b) is a diagram showing a detailed configuration of the error accumulating circuit 612. As shown in Fig. The operation of the error accumulation circuit 612 will be described with reference to FIG.

Error energy in the storage circuit 612, the output voltages (V O1, V O2) upper / lower reference value a (V HYS _ T1, V HYS _B1, V HYS_T2, V HYS _ T2) SIMO converter 600 as compared to (V PWM ) to adjust the duty of the converter by determining whether the overdrive signal is over-delivered or underserved.

To this end, the error accumulating circuit 612 includes a delay unit 612A, a first RS flip-flop 612B, a second RS flip-flop 612C, a third RS flip-flop 612D, D flip flop 612E and third D flip flop 612F, second comparator 612G, third comparator 612H, first OR gate 612I, second OR gate 612J, 612K, seventh switch 612L, and eighth switch 612M.

The delay unit 612A delays the third pulse? S and the first RS flip-flop 612B receives the delayed third pulse? S and the inputted first pulse V O1R , The RS flip-flop 612C receives the delayed third pulse? S and the second pulse V O2R . The second D flip flop 612E receives the output value of the first RS flip flop 612B and the third pulse? S and the third D flip flop 612F receives the output value of the second RS flip flop 612C And the third pulse? S. The first OR gate 612I performs an OR operation on the output value of the second D flip-flop 612E and the output value of the third D flip-flop 612F. The sixth switch 612K is controlled based on the output value? UPS of the first OR gate 612I.

The third RS flip-flop 612D receives the third pulse? S and the fourth pulse V END and the seventh switch 612L receives the output value? DN of the third RS flip- ).

Further, the second comparator (612G) is the lower limit of the first reference voltage (V HYS _B1) and the comparing the voltage (V O1) of the first load, a third comparator (612H) is the lower limit value of the voltage the second reference (V HYS And the voltage V O2 of the second load, and the eighth switch 612J is controlled based on the output value? UP of the second OR gate 612J.

The operation of the error accumulation circuit 612 will be described below.

At steady state, the voltage (V O2) of the first voltage (V O1) of the load to the second load is a first upper limit value of the reference voltage (V HYS _ T1) to the upper limit value of the second reference voltage (V HYS _ T2) If it can not be reached, it is judged that the energy is a little short, so it generates a short Φ UPS and a slightly higher V PWM . If, when the second load voltage (V O2) is the voltage (V O2) of the second load has reached the upper limit (V HYS _ T2) of the second reference voltage is HIGH, the V END, which indicates that charging is complete And generates an on-time of the Φ DN from the time of the rising edge of V END to the third pulse Φ S of the next period.

In the load transient state (for example, when I O2 changes from light load to heavy load), the energy supplied from the converter becomes insufficient, so that the voltage V O2 of the second load becomes low, Becomes smaller than the lower limit value (V HYS - B2 ) of the second reference voltage. In this case, Φ UP is generated for a time when the voltage (V O2 ) of the second load is lower than the lower limit value (V HYS - B2 ) of the second reference voltage to generate V PWM at a high level.

The dead time control & buffer means 613 receives the first input signal V PH1 , the second input signal V PH2 , the output value V Z1 of the first D flip flop 615, and the discontinuous conduction mode (DCM) receiving a signal of V Z1 for, and outputs a control signal to the plurality of switches (S H, S L, S O1, O2 S). At this time, V Z1 is a signal that functions to turn off the second switch S L when the inductor current I L reaches zero.

That is, the dead-time control and buffer means (613) has a third switch (S O1) and the fourth switch (S O2) is to reliably remove the section being turned on at the same time, the third switch (S O1) and the fourth switch (S O2 ) are all turned off.

On the other hand, the first comparator 614 compares the pulse width control voltage V PWM and the ramp voltage V RAMP , and the first D flip flop 615 compares the clock signal? CK and the first comparator 614, And outputs V H.

In summary, the SIMO converter 600 according to the second embodiment of the present invention can perform the operation of maintaining the current inductor current value with the parasitic diode D P of the transistor constituting the fourth switch (V O2 ) To this end, the controller 610 may be configured as described above. Therefore, there is no need of a separate freewheel switch, and there is an advantage that the area of the system can be reduced.

As described above, the present invention has been described with reference to particular embodiments, such as specific elements, and limited embodiments and drawings. However, it should be understood that the present invention is not limited to the above- Various modifications and variations may be made thereto by those skilled in the art to which the present invention pertains. Accordingly, the spirit of the present invention should not be construed as being limited to the embodiments described, and all of the equivalents or equivalents of the claims, as well as the following claims, belong to the scope of the present invention .

Claims (9)

One inductor connected to the power supply; And
A first switch having one end connected to the power source and the other end connected to one end of the inductor, a second switch having one end connected to one end of the first switch and one end of the inductor and the other end connected to ground, A fourth switch having one end connected to the other end of the inductor and the other end connected to the second load, and a fourth switch having one end connected to one end of the inductor and the other end connected to the other end of the inductor, And a fifth switch connected to the other end of the inductor, the plurality of switches operating periodically,
Wherein the first period comprises a first period of time, a second period of time, a third period of time, and a fourth period of time, each of the first period, the second period of time, And the third switch is turned on at the first time and the fourth time. The method according to claim 1,
The second switch is turned on at the fourth time, and the fourth switch is turned on at the second time. The method according to claim 1,
And the fifth switch is turned on at the third time. The method of claim 3,
And a control unit for controlling ON / OFF of the plurality of switches. One inductor connected to the power supply; And
A first switch having one end connected to the power source and the other end connected to one end of the inductor, a second switch having one end connected to one end of the first switch and one end of the inductor and the other end connected to ground, And a fourth switch having one end connected to the other end of the inductor and the other end connected to the second load, the plurality of switches operating periodically; Including,
Wherein the fourth switch comprises a transistor and the fourth switch is a transistor including a parasitic diode, the input terminal of the parasitic diode being connected to the other end of the inductor and the one end of the fourth switch, A first switch connected to one end of the power source and the first switch,
Wherein the first period comprises a first period of time, a second period of time, a third period of time, and a fourth period of time, each of the first period, the second period of time, And the third switch is turned on at the first time and the fourth time. 6. The method of claim 5,
The second switch is turned on at the fourth time, and the fourth switch is turned on at the second time. The method according to claim 6,
Wherein the parasitic diode is operative to flow current in the third time without flowing current in the first time, the second time and the fourth time. 8. The method of claim 7,
An upper limit value and a lower limit value of the first reference voltage for controlling the voltage of the first load, a voltage of the second load, an upper limit value of the second reference voltage for controlling the voltage of the second load, And a control unit for generating a control signal for controlling the plurality of switches through a pulse width control method using a lower limit value. 9. The method of claim 8,
The control unit may include a D flip-flop to which a logic control unit, an error accumulation circuit, a dead-time control & buffer, a comparator, and a reset function are added Features a SIMO converter.
KR1020160010171A 2016-01-27 2016-01-27 SIMO converter with fast response and accurate output voltage KR101737263B1 (en)

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
WO2020214487A1 (en) * 2019-04-15 2020-10-22 Qualcomm Incorporated Single-inductor multiple-output (simo) power converter with a cross-regulation switch

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JP2014011888A (en) 2012-06-29 2014-01-20 Gunma Univ Single-inductor multiple-output dc-dc conversion circuit

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WO2020214487A1 (en) * 2019-04-15 2020-10-22 Qualcomm Incorporated Single-inductor multiple-output (simo) power converter with a cross-regulation switch
US10978947B2 (en) 2019-04-15 2021-04-13 Qualcomm Incorporated Single-inductor multiple-output (SIMO) power converter with a cross-regulation switch

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