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Switchable linear regulator

A linear voltage regulator, constant voltage technology, applied in instruments, amplifiers, amplifiers with semiconductor devices/discharge tubes, etc., can solve problems such as difficulty in selecting resistors

Active Publication Date: 2006-09-27
MEDIATEK INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore in such image 3 In the design of the resistor, the selection of the resistor becomes very difficult, especially when the required level of the output voltage exceeds two

Method used

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  • Switchable linear regulator
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Embodiment Construction

[0032] In order to make the above-mentioned and other purposes, features, and advantages of the present invention more clearly understood, the preferred embodiments are specifically listed below, together with the accompanying drawings, and are described in detail as follows:

[0033] Figure 4 A circuit diagram showing a switchable linear voltage regulator according to an embodiment of the present invention, the switchable linear voltage regulator includes a certain voltage source CVS, a differential amplifier DA, a transfer transistor M A , a first resistor R b , the second resistance unit includes two resistors R 1 with R 2 and a first switch SW 1 and a second switch SW 2 . The constant voltage source CVS provides a certain voltage V ref To the first input terminal of the differential amplifier DA, the second input terminal of the differential amplifier DA is connected to a first node A, and the transfer transistor M A The first end is controlled by the differential ...

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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.

Description

technical field [0001] The present invention relates to sub-linear regulators, and more particularly to linear regulators with selectable output voltages. Background technique [0002] figure 1 It is a standard architecture diagram of a traditional linear regulator, in which the bandgap reference source (bandgapreference) will output a stable voltage V bg , the signal usually passes through an on-chip resistor R bg with an off-chip capacitor C bp The formed low-pass filter (lowpass filter) filters out the noise, and the constant voltage V after filtering ref Feed to the first input of the error amplifier (erroramplifier). exist figure 1 In the example, the error amplifier is an operational amplifier, and the first input terminal is its negative polarity input terminal, the second input terminal (positive polarity input terminal) of the operational amplifier is connected to the first node, and a P-type metal oxide semiconductor ( PMOS) pass transistor (passtransistor) M...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
CPCG05F1/575H03F3/45475H03F2203/45136H03F2203/45534
Inventor 邱继昆
Owner MEDIATEK INC