Wide-input range linear voltage regulator

Abstract

The invention discloses a wide-input range linear voltage regulator. The problem of narrow input range of the conventional linear voltage regulator is mainly solved. The linear voltage regulator comprises a bias voltage generation module (1), a reference voltage generation module (2), a bias current generation module (3), a tail current source generation module (4), a differential input stage (5), a current mirror circuit (6), a power tube PH and a resistive divider, wherein the tail current source generation module (4), the differential input stage (5), the current mirror circuit (6) and high-voltage tubes form an error amplification structure for amplifying a difference between reference voltage VREF and feedback voltage VFB and outputting a differential signal VCOMP which is to the power tube through a buffer stage (7); the drain of the power tube is the output end of the system, and outputs voltage VOUT; a capacitor C and a resistor RC are bridged between VCOMP and power VDD after being connected in series to ensure the stability of a loop; a capacitor C1 is bridged between the high-voltage tube NH2 and VOUT to improve the stability of the loop; and a capacitor C2 is bridged between VOUT and VFB to improve the phase margin of the loop. An input range is effectively widened; and the high-voltage capacitors are adopted, so that production cost is lowered.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits and relates to an analog integrated circuit, in particular to a linear regulator with a wide input range. Background technique [0002] As a very important power management circuit, the linear regulator LDO is widely used in various portable products. The linear regulator LDO belongs to the step-down transformer in the DC-DC converter. It usually provides a specific stable DC voltage. Under a certain load, its output voltage is within a certain range, so the LDO circuit system can ensure the output voltage is stable. , improve battery life. Compared with the commonly used switching power management circuits, it has the advantages of smaller output ripple, simple peripheral circuit and no inductive device. [0003] The key point of LDO design is how to improve the loop stability. Its frequency compensation design will not only directly determine the stability of the system and the acc...

AI Technical Summary

Problems solved by technology

The structure of the traditional linear regulator LDO can no longer meet the market's demand for high performance, especially in terms of input range, stability and power consumption. If the input voltage range is too small, it will affect the application range of the linear regulator LDO. Large static power consumption will affect the service life of the battery, and the fixed output voltage will also affect the flexibility of LDO use

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