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Voltage stabilizing circuit with soft start protection

A technology of start-up protection and voltage stabilization circuit, which is applied in the direction of negative feedback circuit layout, electrical components, parts of amplifiers, etc., can solve the problem of high VDD charging, and achieve the effect of avoiding excessive charging

Pending Publication Date: 2019-07-09
BEIJING TONGFANG MICROELECTRONICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the deficiencies in the above-mentioned prior art, the purpose of the present invention is to provide a voltage stabilizing circuit with soft-start protection to solve the problem of excessive charging of VDD during the rapid power-on process of the external voltage VCC

Method used

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  • Voltage stabilizing circuit with soft start protection

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Embodiment Construction

[0016] Such as image 3 As shown, it is a structural diagram of a voltage stabilizing circuit with soft-start protection embodied in the present invention. The voltage stabilizing circuit includes an error amplifier 201, an output stage PMOS transistor 202, a first resistor 203, a second resistor 204, a first capacitor 205, a soft-start protection circuit 206 and a ground wire GND207, image 3 Among them, the soft start protection circuit 206 is VPG_CTRL, wherein, the error amplifier 201 outputs the voltage VDD to the ground wire GND207, and between the voltage terminal VDD and the ground wire GND207, the first resistor 203 and the second resistor 204 are connected in series, and the first resistor 203 and the second resistor The sampling voltage VDET is obtained between the two resistors 204, the output voltage VPG of the error amplifier 201 is connected to the upper plate of the first capacitor 205 and the gate of the output stage PMOS transistor 202, and the lower plate of ...

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Abstract

The invention provides a voltage stabilizing circuit with soft start protection. The voltage stabilizing circuit comprises an error amplifier, an output stage PMOS transistor, a resistor, a capacitor,a soft start protection circuit and a ground wire GND. Opening and closing of the soft start protection circuit are only related to the power-on detection reset signal, and when the power-on detection reset signal is in a reset state, the soft start protection circuit is opened; when the power-on detection reset signal is in a reset quitting state; the soft start protection circuit is closed, sothat the voltage stabilizing circuit with the soft start protection function can effectively avoid the problem that VDD charging is too high in the external voltage VCC power-on process, and in the chip power-on stable work process, the soft start protection circuit does not affect normal work of the voltage stabilizing circuit; and the total power consumption of the soft start protection circuitis 0 in the stable working process of completing power-on of the chip.

Description

technical field [0001] The invention relates to the technical field of analog integrated circuits, in particular to a voltage stabilizing circuit, in particular to a voltage stabilizing circuit with soft start protection. Background technique [0002] The external power supply VCC of the integrated circuit has a wide range, while a large number of logic circuits inside the chip are relatively low. For example, the external voltage range in smart card applications is 1.62~5.5V, while the withstand voltage of the logic circuit in the 130nm process is only about 1.6V. Therefore, a voltage stabilizing circuit is required to stabilize the external power supply VCC to a lower voltage value VDD to prevent high-voltage breakdown of the logic circuit. Current technology regulator circuits such as figure 1 As shown, it is the structure diagram of the existing voltage stabilizing circuit. In the voltage stabilizing circuit, 101 is an error amplifier. There are 103 resistors and 104 r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/30H03F1/34
CPCH03F1/303H03F1/342
Inventor 马继荣
Owner BEIJING TONGFANG MICROELECTRONICS
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