Digital-analog hybrid low dropout regulator capable of realizing output voltage regulation

Abstract

The invention discloses a digital-analog hybrid low-dropout linear regulator capable of realizing output voltage regulation. The low-dropout linear regulator comprises an output voltage calibration circuit, a power transistor, a voltage sampling circuit, a first external power interface and a second external power interface, the output voltage calibration circuit comprises an error amplifier, a DAC digital-to-analog conversion module, a digital logic unit, a filter network, a starting circuit and a reference circuit. The voltage sampling circuit comprises a first resistance negative feedback network, a second resistance negative feedback network and an ADC analog-to-digital conversion module. The first external power supply interface is connected with a low-voltage domain external voltage VCC, the second external power supply interface is connected with a high-voltage domain external voltage VM, the low-voltage external voltage VCC generates a reference voltage VREF through the starting circuit and the reference circuit, and the reference voltage VREF is input to an in-phase input end of the error amplifier.

Description

Technical field [0001] The invention involves the field of integrated circuit technology, especially a digital model hybrid low -voltage differential stabilizer that can realize the output voltage adjustment. Background technique [0002] In existing technologies, high integration, high reliability and low power consumption have become the development direction of power management chips, power control chips and solid -state lighting chips. Among them, low -voltage differential stabilizers (LDO, Low Dropout Regulator) Due to the fewer external devices, simple structure and convenient integration, small static power consumption and low noise, making it very in line with the demand for power supply by high -performance simulation circuits. However, the existing Sink -type LDO circuits are mostly a structure that generates a fixed output voltage. In the application of DC motor -driven, it cannot meet the needs of high -end gate -drive voltage. [0003] like figure 1 SINK low -voltage...

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Problems solved by technology

However, this LDO can only generate a fixed output voltage, and cannot provide a voltage that follows the change of the power supply voltage, so there are certain application limitations.

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