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Novel enable control circuit for power management system

A power management system and control circuit technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of ESD damage, affecting the normal operation of the power management system, etc. Effect

Active Publication Date: 2013-02-20
GIANTEC SEMICON LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In some system applications, if a relatively small pull-up resistor is added to the enable control input EN terminal to VDD, the low-voltage ESD corresponding to the EN terminal may see a high voltage, causing damage to the ESD, thereby affecting the entire power management. normal working of the system

Method used

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Embodiment Construction

[0014] based on the following figure 2 , specifically explain the preferred embodiment of the present invention.

[0015] Such as figure 2 As shown, it is a novel enable control circuit for a power management system provided by the present invention, the enable control circuit includes five P-type transistors 1, 2, 6, 7, 8 and three N-type transistors 3, 4, 5 and two resistors R1, R2, the first transistor 1, the second transistor 2, the third transistor 3 and the fourth transistor 4 form a comparator, the fifth transistor 5 and the sixth transistor 6 in a diode connection form are connected with the first The resistor R1 is connected in series, the seventh transistor 7 and the eighth transistor 8 respectively form a current mirror with the sixth transistor 6, and the second circuit R2 is connected in series with the seventh transistor 7 and connected in parallel at both ends of the ESD;

[0016] The enable control circuit also includes a clamp amplifier 10, an N-type trans...

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Abstract

The invention relates to a novel enable control circuit for a power management system. The novel enable control circuit comprises five P-shaped transistors, three N-shaped transistors and two resistors, and also comprises a pincers position amplifier, an N-shaped transistor and a third resistor. According to the novel enable control circuit disclosed by the invention, when the value of the voltage at the input end is higher than a certain value, a power management chip is controlled to work normally; when the value of the input voltage is lower than the certain value, the power management chip is controlled to be shut off, so that the power management system is suitable for enable control circuits with different application manners in various systems; and therefore, the adaptability of the enable control input end of the power management chip can be enhanced under a condition that low-voltage ESD (electro-static discharge) is used, the cost of the chip is reduced, the application range of the chip is enlarged and the requirement on the system design is lowered.

Description

technical field [0001] The invention belongs to the field of power management, and in particular relates to a novel enabling control circuit for a power management system. Background technique [0002] With the development of technology, power management chips have been widely used. As a part of the power management chip, the enable control circuit controls the working state of the power management chip. In various system applications, some enable control inputs may be suspended; some may be connected to a capacitor to ground; some may be connected to a resistor to the power supply voltage or directly connected to the power supply voltage. When the enable control input is connected to a resistor to the power supply voltage or directly connected to the power supply voltage, the enable control input may see a high voltage, causing damage to the ESD (electrostatic discharge) chip, because this ESD can only withstand low voltage. [0003] Such as figure 1 Shown is a circuit d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/20
Inventor 蒋宇俊杨清张洪
Owner GIANTEC SEMICON LTD
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