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Band-gap reference trimming circuit suitable for low voltage

A technology of trimming circuit and low voltage, applied in the field of lithium battery power management, can solve problems such as the inability to achieve the consistency of reference voltage

Active Publication Date: 2021-09-10
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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  • Band-gap reference trimming circuit suitable for low voltage
  • Band-gap reference trimming circuit suitable for low voltage
  • Band-gap 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 band-gap reference trimming circuit suitable for low voltage. The circuit comprises a band-gap reference trimming circuit, an oscillator circuit, a voltage detection circuit, a charge pump circuit and a logic circuit. On the basis that the MOS switch tube is used for controlling and trimming the band-gap reference voltage, the oscillator circuit, the charge pump circuit, the power supply switching circuit and the like are introduced, under the condition that the input power supply VDD is low, the control voltage of the MOS switch tube is improved, it is ensured that the MOS switch tube can be fully switched on, the influence of the on-resistance on the resistance in the band-gap reference trimming circuit is reduced, the problem that the reference voltage of the band-gap reference circuit rises in the low-voltage state of the input power supply is effectively solved, and the consistency of the reference voltage of the band-gap reference circuit under full-voltage input is improved.

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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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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