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Capless low drop-out voltage regulator with fast overvoltage response

A voltage regulator, voltage technology, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc.

Inactive Publication Date: 2010-08-25
NXP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] There is a need for an improved voltage regulator that retains the advantages of a capless LDO voltage regulator but is less susceptible to overvoltage conditions as described

Method used

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  • Capless low drop-out voltage regulator with fast overvoltage response
  • Capless low drop-out voltage regulator with fast overvoltage response
  • Capless low drop-out voltage regulator with fast overvoltage response

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Embodiment Construction

[0009] The following is a more detailed description of the present invention. Those skilled in the art will appreciate that the following detailed description is exemplary only and is not intended to be limiting in any way. Other embodiments of the invention will readily suggest themselves to such skilled persons having the benefit of this disclosure. Reference will now be made in detail to the embodiments of the invention illustrated in the accompanying drawings. The same reference numbers will be used throughout the drawings and the ensuing detailed description to refer to the same or like parts.

[0010] Referring to Figure 4, one possible application of the voltage regulator 100 described in more detail below is shown. Voltage regulator 100 forms part of power management IC 201 which provides power to core processor 203 . The core processor 203 may be, for example, a processor of a mobile electronic device. Power is supplied to the power management IC 201 from an exter...

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Abstract

A voltage regulator is provided having one or more discharger circuits that compensate for low on-chip output capacitance and a slow loop response time. In one embodiment, the voltage regulator includes an output transistor coupled to an output voltage line, an output voltage sensing arrangement coupled to the output voltage line for producing an output feedback voltage, and an error amplifier coupled to the output feedback voltage, the output transistor, and a reference voltage for applying feedback control to the output transistor. A first discharger circuit is coupled to the output voltage line and to a reference potential, the first discharger circuit being triggered by a steep-rise overvoltage condition. In another embodiment, a combination of fast and slow discharger circuits is used to improve the load step response - i.e., to stop the output voltage from jumping too high and to pull it back to stable value very quickly, such that the load circuits are protected.

Description

Background technique [0001] Traditional LDO voltage regulators require external capacitors to stabilize the output voltage. To increase battery life and save PCB area in portable applications, low quiescent current, "capless" LDO voltage regulators are increasingly used. However, these capless LDO voltage regulators run into problems when the load current changes very quickly (eg, from tens of milliamperes to zero in less than 1 ns). Due to the limited on-chip output capacitance and slow loop response, the output voltage will jump up to the supply voltage. Also, after the jump, the output voltage drops back to normal very slowly, depending on the resistance of the resistor divider and the capacitance of the on-chip capacitor. As a result, the output voltage of the LDO voltage regulator will deviate from normal and remain near the supply voltage for an exceptionally long period of time. Inevitably, the low voltage load circuit will be destroyed or malfunction as a result. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/571
CPCG05F1/571
Inventor 赵会杨真
Owner NXP BV