Multi-phase DC-DC converter supplying power to load with plural power stages and information processing device including the same
First Claim
1. A DC-DC converter which converts an input voltage into an output voltage having a value different than that of the input voltage and supplies the output voltage to a load, the converter comprising:
- an input terminal to receive the input voltage;
an output terminal to output the output voltage; and
a plurality of power stages each including;
a high side switch one end of which is connected to the input terminal;
a low side switch one end of which is connected to a ground terminal and the other end of which is connected to the other end of the high side switch; and
an inductor one end of which is connected to the other end of the high side switch and the other end of which is connected to the output terminal; and
a control unit configured to execute;
a first mode of controlling the high side switch and the low side switch in each of the power stages so that a ratio of an output current of each of the power stages to a load current flowing through the load becomes a set value; and
a second mode of controlling the high side switch and the low side switch in each of the power stages so that duty ratios of the high side switch and the low side switch are equalized among the power stages,wherein the control unit executes the first mode when the load current is larger than a threshold value, and executes the second mode when the load current is equal to or smaller than the threshold value.
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Accused Products
Abstract
There is provided a DC-DC converter which converts an input voltage into an output voltage for supply to a load, in which an input terminal receives the input voltage, an output terminal outputs the output voltage, power stages each includes: a high side switch, a low side switch and an inductor, the control unit executes a first mode and a second mode wherein the first mode controls the high side switch and the low side switch in each of the power stages so that a ratio of an output current in each of the power stages to a load current flowing through the load becomes a set value and the second mode controls the high side switch and the low side switch in each of the power stages so that duty ratios of the high side switch and the low side switch are equalized among the power stages.
13 Citations
12 Claims
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1. A DC-DC converter which converts an input voltage into an output voltage having a value different than that of the input voltage and supplies the output voltage to a load, the converter comprising:
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an input terminal to receive the input voltage; an output terminal to output the output voltage; and a plurality of power stages each including; a high side switch one end of which is connected to the input terminal; a low side switch one end of which is connected to a ground terminal and the other end of which is connected to the other end of the high side switch; and an inductor one end of which is connected to the other end of the high side switch and the other end of which is connected to the output terminal; and a control unit configured to execute; a first mode of controlling the high side switch and the low side switch in each of the power stages so that a ratio of an output current of each of the power stages to a load current flowing through the load becomes a set value; and a second mode of controlling the high side switch and the low side switch in each of the power stages so that duty ratios of the high side switch and the low side switch are equalized among the power stages, wherein the control unit executes the first mode when the load current is larger than a threshold value, and executes the second mode when the load current is equal to or smaller than the threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A DC-DC converter which converts an input voltage into an output voltage having a value different than that of the input voltage and supplies the output voltage to a load, the converter comprising:
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an input terminal to receive the input voltage; an output terminal to output the output voltage; and a plurality of power stages each including; a high side switch one end of which is connected to the input terminal; a low side switch one end of which is connected to a ground terminal and the other end of which is connected to the other end of the high side switch; and an inductor one end of which is connected to the other end of the high side switch and the other end of which is connected to the output terminal; and a controller which executes one of a first mode and a second mode and which is configured to selectively switch between the first mode and the second mode; wherein in the first mode, the controller controls the high side switch and the low side switch in each of the power stages so that a ratio of an output current of each of the power stages to a load current flowing through the load becomes a set value; and wherein in the second mode, the controller controls the high side switch and the low side switch in each of the power stages so that duty ratios of the high side switch and the low side switch are equalized among the power stages, wherein the controller executes the first mode when the load current is larger than a threshold value, and executes the second mode when the load current is equal to or smaller than the threshold value. - View Dependent Claims (9, 10, 11, 12)
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Specification