Quickly responded low dropout regulator capable of dynamically adjusting reference voltage

A low-dropout linear and reference voltage technology, applied in the direction of adjusting electrical variables, instruments, control/regulation systems, etc., can solve the problem of high power consumption of LDO, achieve the effect of avoiding voltage drop and improving response speed

Active Publication Date: 2015-07-15
XI AN UNIIC SEMICON CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problem of high power consumption of the existing low-dropout linear regulator LDO, the present invention provides a fast-response low-dropout linear regulator LDO that dynamically adjusts the reference voltage

Method used

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  • Quickly responded low dropout regulator capable of dynamically adjusting reference voltage
  • Quickly responded low dropout regulator capable of dynamically adjusting reference voltage
  • Quickly responded low dropout regulator capable of dynamically adjusting reference voltage

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Embodiment Construction

[0026] Such as figure 2 Shown, the present invention has increased 20 parts circuits on the original basis. The 20-part circuit includes a fixed reference voltage generation circuit, a threshold comparison circuit, a dynamic reference voltage generation circuit and a selector. The feedback resistor string 17 is connected to the positive input terminal of the operational amplifier 15, one end of the feedback resistor string 17 is connected to the drain end of the power transistor 16, the other end of the feedback resistor string 17 is grounded, and the source terminal of the power transistor 16 is connected to V DD Power supply, the gate terminal of the power transistor 16 is connected to the output terminal of the operational amplifier, the input terminal of the fixed reference voltage production circuit is connected to the output terminal of the bandgap reference 10, and the fixed reference voltage production circuit is used to produce a fixed reference voltage value Vref0 a...

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Abstract

The invention relates to a quickly responded low dropout regulator capable of dynamically adjusting a reference voltage. The low dropout regulator comprises a band gap reference, an operational amplifier, a feedback resistor string and a power tube; the feedback resistor string is connected to the positive input end of the operational amplifier; one end of the feedback resistor string is connected to the drain terminal of the power tube; the other end of the feedback resistor string is connected to the ground; the source terminal of the power tube is connected to a VDD power supply; the gate terminal of the power tube is connected to the output end of the operational amplifier; the low dropout regulator further comprises a fixed reference voltage generating circuit, a threshold comparing circuit, a dynamic reference voltage generating circuit and a selector. The low dropout regulator disclosed by the invention solves the technical problem that the existing LDO (low dropout regulator) has high power consumption; through dynamical adjustment of the reference voltage of the LDO, a response speed of the LDO is increased, and a large voltage drop of the LDO is avoided.

Description

technical field [0001] The invention relates to a fast-response low-dropout linear regulator LDO for dynamically adjusting a reference voltage. Background technique [0002] A general LDO consists of a bandgap reference, an operational amplifier, a feedback resistor string and 14 power tubes. The feedback resistor string includes resistor R1 and resistor R2; the bandgap reference produces a reference voltage Vref for comparison; the feedback resistor string determines the feedback coefficient; the operational amplifier adjusts the grid voltage of the power transistor 14 so that the feedback voltage Vfb=Vref=Vout* R2 / (R1+R2). [0003] Therefore, the output voltage Vout of the LDO=Vref*(R1+R2) / R2. By increasing the quiescent current Iq of the operational amplifier to improve the response speed of the LDO, thereby reducing the voltage drop and overshoot of the LDO output, and speeding up the recovery speed of the LDO output voltage. Although this method can avoid the large v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
Inventor 成俊
Owner XI AN UNIIC SEMICON CO LTD
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