A Bandgap Reference Trimming Circuit Suitable for Low Voltage

A technology for trimming and adjusting circuits and low voltage, which is applied in the field of lithium battery power management, can solve the problems such as the inability to achieve the consistency of the reference voltage, and achieve the effect of solving the increase of the reference voltage, improving the consistency, and increasing the control voltage

Active Publication Date: 2022-05-06
NANJING HUIGAN ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the case of low-voltage power input, it cannot achieve good reference voltage consistency

Method used

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  • A Bandgap Reference Trimming Circuit Suitable for Low Voltage
  • A Bandgap Reference Trimming Circuit Suitable for Low Voltage
  • A Bandgap Reference Trimming Circuit Suitable for Low Voltage

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Embodiment Construction

[0029] The present invention will be further illustrated below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented on the premise of the technical solution of the present invention. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0030] Such as Figures 1 to 6 As shown, the embodiment of the present invention provides a bandgap reference trimming circuit suitable for low voltage, including a bandgap reference trimming circuit 1, an oscillator circuit 2, a voltage detection circuit, a charge pump circuit 3 and a logic circuit 4 .

[0031] Wherein, the bandgap reference trimming circuit 1 is connected with the input power supply VDD for generating a reference voltage VREF, a divided voltage VBER, a control voltage signal VBP and a control voltage signal VBN. Wherein, the initial value of the reference voltage VRE...

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Abstract

The invention discloses a bandgap reference trimming circuit suitable for low voltage. The circuit includes a bandgap reference trimming circuit, an oscillator circuit, a voltage detection circuit, a charge pump circuit and a logic circuit. On the basis of using MOS switch tubes to control and adjust the bandgap reference voltage, the present invention improves the performance of MOS switch tubes when the input power supply VDD is low by introducing an oscillator circuit, a charge pump circuit, and a power switching circuit. Control the voltage to ensure that the MOS switch tube can be fully turned on, reduce the influence of the on-resistance on the resistance in the bandgap reference trimming circuit, and effectively solve the problem of the reference voltage rise of the bandgap reference circuit in the low-voltage state of the input power supply , improving the consistency of the reference voltage of the bandgap reference circuit under full voltage input.

Description

technical field [0001] The invention relates to the technical field of lithium battery power management, in particular to a bandgap reference trimming circuit suitable for low voltage. Background technique [0002] In the prior art, a low-impedance poly or Metal Al fuse resistor is directly connected to an adjustable resistor series structure. When trimming the reference voltage, the reference voltage can only be trimmed in one direction from the lowest voltage to the high voltage. At the beginning of the test, it is necessary to burn and adjust the reference voltage value to the target value first, in order to obtain a reasonable reference voltage value, otherwise the circuit related to the reference may have an initial reference voltage that is too low, resulting in other tests related to the reference voltage. There is a test function or an abnormal electrical parameter when the function or electrical parameter is abnormal, and it is impossible to judge whether the syste...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/56
CPCG05F1/56
Inventor 吴霖樊杨章羚洪
Owner NANJING HUIGAN ELECTRONICS TECH CO LTD
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