Low Output Voltage Fast Response LDO Circuit Based on Current Control Loop

A current and circuit technology, applied in the field of integrated circuit design, can solve problems such as limiting the output voltage range and being unable to produce a voltage output lower than 1V, and achieve the effects of reducing output ripple, rapid response, and precise control
CN102298407AInactive Publication Date: 2011-12-28NAT UNIV OF DEFENSE TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NAT UNIV OF DEFENSE TECH
Publication Date
2011-12-28
Estimated Expiration
Not applicable · inactive patent

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Abstract

The response ability to the transient change of the load is an important indicator of the LDO performance of the low dropout voltage regulator. The present invention learns from the loop control method of the charge pump type phase-locked loop, discloses a low output voltage fast response LDO structure based on the current control loop, the feedback voltage is converted into current, and the current signal is used as the carrier in the control loop. Operation, the difference current is integrated by the loop filter to form the control voltage of the power tube. Low-dropout regulators based on current control loops respond well to load transients and can produce voltage outputs lower than typical bandgap reference voltages. The fast-response LDO circuit based on the current control loop disclosed by the invention is composed of a voltage buffer, a transconductance amplifier, a loop filter, a power tube and an off-chip load.
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Description

technical field

[0001] The invention belongs to the field of integrated circuit design and is used for the design of a low-dropout regulator circuit (Low-dropout Regulator, LDO), in particular to a circuit structure for improving the transient response capability of the LDO by using a current control loop. Background technique

[0002] Power integrated circuits are an indispensable part of electronic systems. As a kind of power supply integrated circuit, LDO is widely used because of its advantages of flexible use, little influence on power supply voltage, and small output ripple. figure 1 A is a typical LDO circuit structure, which uses a resistor network to sample and an operational amplifier (Operational Amplifier, OP) to amplify the error voltage. This is a typical second-order loop, figure 1 B is the transmission model of the loop.

[0003] Although LDO has many advantages, there are still several problems that limit the use of LDO, the most prominent of which is the...

Claims

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