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Dynamic discharge circuit and LDO integrated with same

A discharge circuit and charge technology, applied in the direction of adjusting electrical variables, instruments, control/regulation systems, etc., can solve problems such as low quiescent current and fast load transient response, shorten recovery time, improve transient response, and reduce the maximum value effect

Inactive Publication Date: 2012-10-03
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the existing LDO cannot take into account both low quiescent current and fast load transient response, and proposes a dynamic charge discharge circuit

Method used

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  • Dynamic discharge circuit and LDO integrated with same
  • Dynamic discharge circuit and LDO integrated with same
  • Dynamic discharge circuit and LDO integrated with same

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Embodiment Construction

[0017] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0018] The structure schematic diagram of the dynamic charge discharging circuit (Dynamic Discharging Circuit, DDC) that the present invention proposes is as follows figure 2 As shown, including: the first error amplifier HB_OP, the first MOS transistor MN and the first capacitor C M1 , wherein, the positive input terminal of the first error amplifier HB_OP is used as the first input terminal of the dynamic charge discharge circuit, the negative input terminal of the first error amplifier HB_OP is used as the second input terminal of the dynamic charge discharge circuit, and the first The output terminal of an error amplifier HB_OP is connected to the first capacitor C M1 The first terminal of the first terminal is connected to the control electrode of the first MOS transistor MN, and the first capacitor C M1 The second terminal of the first...

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Abstract

The invention discloses a dynamic discharge circuit and an LDO (Low Dropout Regulator) integrated with the same. The dynamic discharge circuit comprises a first error amplifier, a first MOS (Metal Oxide Semiconductor) tube and a first capacitor. The LDO comprises a second error amplifier, a second PMOS (P-channel Metal Oxide Semiconductor) tube, a second capacitor, a first resistor and a second resistor. The dynamic discharge circuit provided by the invention, under the premise of not significantly increasing the static power consumption, can detect the change of voltage at the output terminal when the LDO load jumps from heavy load to light load, and form a discharge channel for leading the output of the LDO to be grounded, thereby greatly reducing the uprush maximum of the output; and the LDO integrated with the dynamic discharge circuit can greatly reduce the uprush maximum of output voltage, thereby shortening the recovery time of the LDO circuit from a transient state to a steady state and improving the transient response of the LDO circuit.

Description

technical field [0001] The invention belongs to the technical field of power supply management, and in particular relates to the design of a low dropout linear regulator (Low Dropout Regulator, LDO). Background technique [0002] LDO has the advantages of low cost, low output noise, simple circuit structure, and small chip area, and has become an important circuit in power management chips. [0003] The essence of LDO is to use the stable voltage generated by the bandgap reference and the negative feedback control loop to obtain an output voltage that basically does not change with the environment. LDOs can convert the decaying battery voltage into a stable and accurate voltage with low noise to meet the needs of noise-sensitive analog modules and radio frequency modules in portable equipment. In portable applications, however, power efficiency is critical to extending battery life, so low quiescent current and low dropout are critical in LDO designs. In the case of low po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
Inventor 明鑫谭林张竹贤黄建刚王鑫张晓敏邱实周泽坤王卓张波
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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