Switchable linear regulator
AssigneeMediatek Inc.
InventorChi-Kun Chiu
Life of this patent
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Abstract
A switchable linear regulator. The switchable linear regulator comprises a constant voltage source, a differential amplifier, a pass transistor, a first resistor, a plurality of second resistors and a plurality of switches. The differential amplifier has a first input terminal coupled to the constant voltage source and a second input terminal connected to a first node. The pass transistor has a first terminal controlled by the differential amplifier, a second terminal coupled to a supply voltage, and a third terminal connected to a second node. The first resistor is connected between the first and second nodes. Each second resistor comprises one end connected to the first node. Each switch is coupled between the other end of a corresponding second resistor and the ground.
Claims7
A switchable linear regulator for providing a selectable output voltage, the switchable linear regulator comprising:
- a constant voltage source;
- a differential amplifier having a first input terminal coupled to the constant voltage source and a second input terminal connected to a first node;
- a transistor with a first terminal controlled by the differential amplifier and a second terminal coupled to a supply voltage and a third terminal connected to a second node;
- a first resistor connected between the first and second nodes;
- a plurality of second resistors, each comprising one end connected to the first node;
- and
- a plurality of switches, each coupled between the other end of the corresponding second resistor and a fixed voltage and controlled by a corresponding control signal;
- wherein the voltage at the second node is output as the output voltage which is selectable according to the control signals.
Dependencies are inferred from the claim text.