Power circuits and semiconductor devices

Abstract

The present application provides a power supply circuit and a semiconductor device. The power supply circuit includes: an output transistor coupled between an input terminal to which an input voltage is input and an output terminal to which an output voltage is output; an error amplifier configured to The voltage of the voltage and the reference voltage are used to generate a first error signal and a second error signal, and output the first error signal to the gate terminal of the output transistor; an anti-overshoot circuit is coupled to the output terminal and is subjected to the second error signal control; an output transistor control section configured to add a control signal based on a first current according to an AC component of the output voltage to the first error signal; and a sensitivity adjustment section configured to When the output voltage is higher than a certain voltage, the first current is reduced based on the second error signal. The power supply circuit provided by the present application can reliably keep the output voltage within the power supply voltage range where the load can work.

Description

technical field [0001] Embodiments discussed herein relate to a power supply circuit and a semiconductor device. Background technique [0002] Among on-chip voltage regulators (on-chipregulators) used as power supply circuits for supplying power to microcontrollers, memories, etc., there are Cap-Free systems (reducing terminals, reducing external component) requirements. However, the response characteristics of a linear regulator depend on the consumption current of the circuit, therefore, the feedback loop becomes hysteresis due to low power consumption, and it is difficult to follow changes in the output voltage. Furthermore, not attaching the capacitor results in an increase in the amount of change in the output voltage. Therefore, in a linear regulator, if low power consumption is realized and a capless system is used, the response characteristics with respect to load changes become poor, and if, for example, the load changes sharply and the output voltage changes grea...

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Problems solved by technology

Thus, although the output voltage VDD of the power supply circuit is at a high level, the output voltage VDD increases by the same amount as when the output voltage VDD is in a steady state

As a result, the output voltage VDD exceeds the upper limit value V of the power supply voltage range in which the load 102 can operate. 最 大 , and there may be reliability problems, such as resulting in operational failures and a reduction in the operational life of the product

[0011] That is, there are cases where Figure 8 In the conventional power supply circuit shown, when the load operation cycle repeatedly generated by the load current Ild is continuously repeated at a certain time interval, the output voltage VDD overshoots and exceeds the upper limit value V of the power supply voltage range in which the load 102 can work. 最大

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