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Low dropout voltage regulator

A low-dropout voltage regulator and amplifier technology, which is applied in the direction of instruments, control/regulation systems, and regulation of electrical variables, etc., can solve the problems of increased overall cost, occupied volume, and difficulty in ensuring stability with compensation technology

Inactive Publication Date: 2005-10-05
O2 MICRO INT LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of such external components requires at least one pad, one wire and one pin, resulting in an increase in overall cost
In addition, external components also occupy a certain volume, so additional costs are required
It is difficult for some existing compensation techniques to ensure stability over the wide output current range required by LDOs

Method used

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Examples

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Embodiment Construction

[0010] figure 1 Shown is a simplified block diagram of an electronic device 100 having a power supply 102 , a low dropout regulator LDO 106 and a load 108 . The electronic device 100 can be various devices, such as a notebook computer, a mobile phone, a personal digital assistant, and so on. The power source 102 can be a battery, such as a lithium battery, for providing an unstable DC voltage to the LDO 106 . Various other components, such as a DC / DC converter, may be connected between the power supply 102 and the low dropout regulator LDO 106 . for clarity figure 1 Only one low dropout regulator LDO 106 and its associated load 108 are shown, but the electronic device 100 may have multiple low dropout regulators to drive any number of loads. Low dropout regulator LDO 106 may also be integrated with load 108 on one integrated circuit (IC). As used herein, "integrated circuit" refers to a semiconductor device and / or microelectronic device, such as a semiconductor integrated ...

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PUM

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Abstract

A low dropout voltage regulator includes a regulating circuit, an amplifier, and a first compensating path. The regulating circuit is configured to receive an input signal at an input terminal and provide an output signal at an output terminal in response to a control signal received at the control terminal. The amplifier may have a first input terminal coupled to a first input path and an output terminal be coupled to the control terminal of the regulating circuit via a path to provide the control signal. The first compensating path is coupled between a first node on the first input path and a first node on the path coupling the output terminal of the amplifier to the control terminal of the regulating circuit, the first compensating path including a first compensating capacitor.

Description

Background technique [0001] Low dropout regulators (LDOs) are used in various electronic devices, such as, but not limited to, laptop computers, mobile phones, personal digital assistants, etc., to provide a regulated output voltage to a load for these devices. Low-dropout regulators can be used when a power supply cannot provide a stable voltage value for a particular load in an electronic device, and / or when the power supply is not accurate enough for that particular load. Typically a low dropout regulator can provide such a regulated output voltage with only a small voltage drop across the low dropout regulator. [0002] As a negative feedback system, LDO usually requires frequency compensation to ensure stability. However, many prior art embodiments often use external components, such as a capacitor externally connected to the LDO to implement frequency compensation. The use of such external components requires at least one pad, one wire, and one pin, resulting in an inc...

Claims

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Application Information

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IPC IPC(8): H02J1/00G05F1/40G05F1/46G05F1/56G05F1/575H02M3/137
CPCG05F1/575H01H13/705H01H13/88H01H2229/028
Inventor 陈继伟栗国星
Owner O2 MICRO INT LTD
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