Linear regulator with soft start control circuit

A technology of linear voltage stabilizer source and control circuit, applied in control/regulating system, adjusting electrical variables, instruments, etc., can solve problems such as system lockup, shortening of chip and even the service life of power supply, and jumping of power supply value.

Active Publication Date: 2014-04-16
SAMSUNG SEMICON CHINA RES & DEV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This problem is especially serious when the power supply voltage VDD rises rapidly to a higher value, which may cause a large jump in the power supply value, easily cause the entire system to lock up, and shorten the service life of the chip and even the power supply

Method used

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  • Linear regulator with soft start control circuit
  • Linear regulator with soft start control circuit
  • Linear regulator with soft start control circuit

Examples

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Embodiment Construction

[0020] Exemplary embodiments of the present invention will now be described in detail, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like parts throughout.

[0021] image 3 is a diagram illustrating a linear regulated voltage source with a soft-start control circuit according to an exemplary embodiment of the present invention.

[0022] Such as image 3 As shown, the linear stabilized voltage source with a soft-start control circuit according to an exemplary embodiment of the present invention includes an operational amplifier AMP10, an output stage circuit, a soft-start mode control switch and a power drive tube 11, wherein the output stage circuit is a prior art The output stage circuit in can comprise power drive tube 12, feedback resistance 13,14, output load capacitor Cout; Power drive tube 11 size is smaller than power drive tube 12, and the width-to-length ratio of power drive tube 12 and drive tube 11 width-t...

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PUM

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Abstract

The invention provides a linear regulator with a soft start control circuit. The linear regulator comprises an operational amplifier and an output cascade circuit, wherein the operational amplifier compares a voltage distributing signal with a reference voltage of an output node of the output cascade circuit and outputs a control signal to control the output cascade circuit. When the linear regulator is in a non-start stage, the output cascade circuit outputs constant voltages. The linear regulator is characterized by further comprising the soft start control circuit and a first power drive tube, wherein the size of the first power drive tube is smaller than that of a power drive tube in the output cascade circuit, the soft start control circuit detects whether the linear regulator is in the start stage, when the linear regulator is in the start stage, the first power drive tube is started so that the linear regulator can charge a load with currents flowing through the first power drive tube, and when the linear regulator is in the non-start stage, the power drive tube in the output cascade circuit charges the load.

Description

technical field [0001] The present application relates to the field of system-on-chip (SOC) integrated circuit design, and more specifically, relates to a linear voltage regulator with a soft-start control circuit capable of controlling startup current. Background technique [0002] figure 1 is a diagram showing a prior art linear regulator (LDO). Such as figure 1 As shown, the circuit includes an operational amplifier AMP and an output stage circuit. The output stage circuit may include a power PMOS transistor, feedback resistors R1, R2 and an output load capacitor Cout. When starting, the circuit is prone to generate a huge starting current. figure 2 show figure 1 Timing diagram of the linear regulator. Such as figure 2 As shown, when the linear regulated source starts with its power supply voltage VDD changing from low to high, the initial value of the output voltage Vout is 0, and the voltage of the resistor divider FB is also 0, which is far lower than that of th...

Claims

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Application Information

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IPC IPC(8): G05F1/56
Inventor 吴献
Owner SAMSUNG SEMICON CHINA RES & DEV
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