Auxiliary LDO circuit and switching supply circuit

A power supply circuit and circuit technology, which is applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve the problems of large power consumption and system power consumption, and achieve the effects of low power consumption, power saving, and small static current
CN105242736AInactive Publication Date: 2016-01-13上海芯圣电子股份有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
上海芯圣电子股份有限公司
Publication Date
2016-01-13
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses an auxiliary LDO circuit and a switching circuit. The auxiliary LDO circuit comprises a band-gap reference circuit used for generating reference voltage, and a first negative feedback circuit used for powering a load. The first negative feedback circuit is connected with the band-gap reference circuit. The auxiliary LDO circuit further comprises a first power supply output end used for powering a load. The first power supply output end is connected with the first negative feedback circuit.In a chip system, the band-gap reference circuit offers reference voltage to the first negative feedback circuit when a digital circuit is in the sleep state. The load is supplied with power via the first power supply output end. Due to the fact that all devices of the auxiliary LDO circuit work in a sub-threshold region, an MOS tube consumes low quiescent current in the sub-threshold region in the band-gap reference circuit such that little power consumption is generated by the overall circuit, thereby saving electric energy.
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Description

technical field

[0001] The invention relates to an integrated circuit, in particular to an auxiliary LDO circuit and a switching power supply circuit used in a sleep state. Background technique

[0002] In the design of MCU (microprocessor) and other circuits, a sleep (sleep) state with lower power consumption is required, but the digital circuit in the chip system works at a lower power supply voltage, and the power supply of the whole system is high voltage. Therefore, LDO (Low Dropout Regulator) is needed in the system to convert the high-voltage power supply into a low-voltage power supply to supply power to the digital system, but the general LDO requires higher precision and load performance, so the power consumption of the LDO will be higher. It is relatively large, and it is also necessary to turn on the LDO in the sleep state. Only when the LDO is turned on can the system be in a state of waking up at any time, which makes the overall power consumption of the system...

Claims

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