Transient state intensifier circuit applicable for capacitance-free large power low voltage difference linear voltage regulator

Abstract

The invention relates to a transient state intensifier circuit applicable for a capacitance-free large power low voltage difference linear voltage regulator. The low voltage difference linear voltage regulator comprises a power adjusting tube; the transient state intensifier circuit comprises a voltage sampling part and a transient state intensifying part; the voltage sampling part is connected with an output end of the low voltage difference linear voltage regulator; an input end of the transient state intensifying part is connected with the voltage sampling part; an output end of the transient state intensifying part is connected with the grid of the power adjusting tube; when the low voltage difference linear voltage regulator changes from the light load to the heavy load, the level of the grid of the power adjusting tube is pulled down by the transient state intensifying part and an output voltage of the lowered low voltage difference linear voltage regulator is recovered; and when the low voltage difference linear voltage regulator changes from the heavy load to the light load, the level of the grid of the power adjusting tube is risen by the transient state intensifying part and the output voltage of the risen low voltage difference linear voltage regulator is recovered. The transient state intensifier circuit is simple in structure; a static power consumption current of the low voltage difference linear voltage regulator is hardly increased; and the rapid response of the low voltage difference linear voltage regulator is realized.

Description

technical field [0001] The invention relates to a circuit capable of realizing fast transient response for a non-capacitor low-dropout linear regulator circuit. Background technique [0002] LDO (Low Dropout Voltage Regulator: Low Dropout Voltage Regulator) is the simplest linear regulated power supply. It has the advantages of small size, low noise, low output ripple, no electromagnetic interference, simple design, and few peripheral components. [0003] Compared with the traditional LDO, the biggest difference of the non-capacitor LDO is that the circuit structure lacks a large capacitor connected in parallel at the output end. In a traditional LDO, the large capacitor at the output is a very important charge storage and supply device, which can effectively reduce the output voltage drop and voltage overshoot due to the step change of the load current. For the capless LDO, the step change of the load must rely on the fast response of the pass transistor, that is, the gate...

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Problems solved by technology

[0005] The patent application with the application number 200610023879.7 discloses a method to speed up the output voltage of the LDO, but the variation range of the load current is small, and the maximum load is only 100mA; at the same time, in order to reduce the additional static power consumption, the resistance of the comparison potential is generated The voltage divider network requires a larger resistance value, which undoubtedly occupies a larger chip area

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