Method for realizing voltage regulation by digital low dropout voltage regulator and digital low dropout voltage regulator

Abstract

The invention discloses a voltage stabilization implementing method for a digital low voltage difference voltage stabilizer, and the digital low voltage difference voltage stabilizer. The method includes: acquiring two or more first numerical values for controlling a transistor turn-on number when the output voltage and the reference voltage are equal for continuous twice or more; calculating a second numerical value for controlling the transistor turn-on number when the output voltage is stable according to the acquired two or more first numerical values; and using the second numerical value to control the transistor turn-on number of the digital low voltage difference voltage stabilizer. In the technical scheme, the second numerical value controls the transistor turn-on number to be close to the numerical value when the output voltage is stable, and in this way, the D-LDO output voltage can be rapidly stabilized, the response speed of the D-LDO output voltage is improved, the D-LDO can rapidly achieve stabilized output voltage, the stabilization time of the D-LDO is shortened, the starting time of the D-LDO is shortened, and ringing can be reduced to some extent.

Description

technical field [0001] The invention relates to but not limited to power management technology, especially a digital low-dropout voltage stabilizer and a method for realizing voltage stabilization and the digital low-dropout voltage stabilizer. Background technique [0002] Low Dropout Regulator (LDO, Low Dropout Regulator) voltage regulator as a power management circuit has been widely used in portable electronic devices, wireless energy transmission systems and other fields. figure 1 It is a schematic diagram of a circuit principle of a digital LDO (D-LDO) in the related art, such as figure 1 As shown, the output voltage Vout is compared with the reference voltage Vref and then output to the counter to control the increase or decrease of the counter value. The counter transmits the value to the decoder, and the decoder controls the P-channel metal oxide semiconductor through the decoded information. The conduction number of the (PMOS) transistor array controls the output ...

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Problems solved by technology

That is to say, due to the ringing phenomenon, the D-LDO will go through multiple oscillations at the output end to achieve a stable output. In this way, the response speed of the D-LDO output voltage is seriously reduced, making the D-LDO take longer to achieve output voltage stabilization, thereby increasing the startup time of the D-LDO

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