A light-load transient enhancement circuit and a low-dropout linear regulator integrating the circuit

A low dropout linear, voltage regulator technology, applied in instruments, regulating electrical variables, control/regulating systems, etc., can solve problems such as inability to respond to load transient switching, limited voltage slew rate, etc., to enhance transient response performance , the effect of low load current and reduced settling time

Inactive Publication Date: 2016-06-01
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this kind of voltage regulator improves the problem of limited slew rate of power regulator tube voltage to a certain extent, its transconductance and unity gain bandwidth cannot respond to fast load transient switching under low bias current

Method used

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  • A light-load transient enhancement circuit and a low-dropout linear regulator integrating the circuit
  • A light-load transient enhancement circuit and a low-dropout linear regulator integrating the circuit
  • A light-load transient enhancement circuit and a low-dropout linear regulator integrating the circuit

Examples

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Embodiment

[0033] In this example, if figure 1 As shown, a light-load transient enhancement circuit of the present invention includes: a dynamic bias voltage generation circuit 1, a load current control switch 2, a voltage stabilizing capacitor 3, a discharge circuit 4 and an output circuit 5;

[0034] Dynamic bias voltage generating circuit 1, including PMOS transistor MP1 and NMOS transistor MN1; the gate voltage of PMOS transistor MP1 is the gate voltage VGP of the adjustment transistor MP of the low dropout linear regulator, and the sources are respectively connected to the input power supply VDD, PMOS The drain of the transistor MP1 is connected to the drain and the gate of the NMOS transistor MN1, the source of the NMOS transistor MN1 is connected to the ground, and the dynamic bias voltage generation circuit 1 generates an adaptive bias voltage VBNA of the NMOS transistor, that is, the gate of the NMOS transistor MN1 Voltage;

[0035] Load current control switch 2, including PMOS...

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PUM

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Abstract

The invention discloses a light-load transient enhancement circuit and a low-dropout linear voltage regulator integrating the circuit, including a dynamic bias voltage generating circuit, a load current control switch, a voltage stabilizing capacitor, a discharge circuit and an output circuit; The transient enhancement circuit does not consume any quiescent current at light loads. When the low-dropout linear regulator switches from heavy load to light load, the light-load transient enhancement circuit provides gradually decreasing load current, which greatly reduces the low dropout linear regulator. the settling time of the voltage regulator, thereby overcoming the problem of too long settling time when the existing low-dropout linear regulator is switched from heavy load to light load; secondly, the present invention does not require too many additional auxiliary circuits, and has a simple structure and can Enhanced light-load transient response performance of low-dropout linear regulators for ultra-low-power medical electronics applications.

Description

technical field [0001] The invention belongs to the technical field of power supply management, and more specifically relates to a light-load transient enhancement circuit and a low-dropout linear voltage regulator integrating the circuit. Background technique [0002] As an important part of the power management system, low-dropout linear regulators play an important role in various medical electronic equipment due to the advantages of fewer peripheral components, low output noise, and good transient performance. At present, the output capacitance range of the on-chip low dropout linear regulator is only 0-100pF, which can be fully integrated in the system, eliminating external off-chip capacitance, saving PCB pin area, speeding up the manufacturing process, and reducing system cost, so it is widely used be utilized. [0003] However, in ultra-low power medical electronics such as voltage regulators for energy harvesting systems and passive RFID tags, energy is a rather sc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/56
Inventor 郑文锋屈熹刘珊杨波林鹏李晓璐
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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