A two-stage series dc-dc converter

A DC-DC and converter technology, applied in the field of two-stage series DC-DC converters, can solve the problems of unfavorable two-stage series converter efficiency and unfavorable reduction of LDO loss, and achieve good output voltage accuracy and high adjustment The effect of improving rate and efficiency

CN104092375BInactive Publication Date: 2016-08-31UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2016-08-31
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to the field of integrated circuit design, in particular to a two-stage series DC-DC converter composed of Buck and LDO. The present invention proposes a two-stage series DC-DC converter with a variable Buck output voltage. The Buck output voltage can be adaptively adjusted according to the load current, and the adjustment tube MP of the LDO is always allowed to work at the boundary between the saturation region and the linear region. The loss of the LDO is reduced, and the efficiency of the entire converter is improved, especially the light load efficiency is significantly improved. The invention is particularly applicable to DC-DC converters.
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Description

technical field

[0001] The invention belongs to the field of integrated circuit design, and specifically relates to a two-stage series DC-DC converter composed of a Buck and an LDO (low dropout linear regulator). Background technique

[0002] In the power supply system, Buck and LDO are usually used for power supply on the load side (POL), responsible for converting the front-end AC-DC output voltage or battery voltage into the working voltage required by the load. In order to balance efficiency and noise, the power supply at the load side generally adopts a two-stage DC-DC converter scheme with Buck series LDOs. First, the input voltage is reduced to an intermediate voltage, and then the LDO is used to convert this intermediate voltage into the working voltage required by the load. The front-stage Buck has high conversion efficiency, and the rear-stage LDO can reduce the output noise of the front-stage Buck to provide low-noise power supply for the load.

[0003] A traditi...

Examples

Embodiment Construction

[0015] The specific embodiment of the present invention is described below in conjunction with accompanying drawing

[0016] The present invention proposes a two-stage series DC-DC converter with a variable Buck output voltage. The Buck output voltage can be adaptively adjusted according to the load current, and the adjustment tube MP of the LDO is always allowed to work at the boundary between the saturation region and the linear region. The loss of LDO is reduced, and the efficiency of the entire converter is improved, especially the light load efficiency is significantly improved

[0017] Two-stage series DC-DC converter of the present invention such as figure 2 As shown, the whole consists of three parts: Buck, LDO and gate voltage control module, where Buck and LDO are connected with figure 1 The Buck and LDO in the traditional structure shown are the same, including the controller, switching circuit and feedback loop; the gate voltage control module is used to generate...