Semiconductor integrated circuit for regulator

An integrated circuit and semiconductor technology, applied in the field of DC power supply devices, can solve problems such as poor response characteristics, and achieve the effect of improving transient response characteristics

Active Publication Date: 2013-01-02
MITSUMI ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in Figure 4 In a regulator with a switching function, the path for releasing the charge charged in the output capacitor Co is only the load, so there is a problem that the response characteristic when switching the output voltage Vout from a high voltage to a low voltage is poor, and the desired levels take time

Method used

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  • Semiconductor integrated circuit for regulator
  • Semiconductor integrated circuit for regulator
  • Semiconductor integrated circuit for regulator

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Embodiment Construction

[0031] Next, preferred embodiments of the present invention will be described based on the drawings.

[0032] figure 1 An embodiment of a series regulator (including an LDO) to which the present invention is applied is shown. In addition, although not particularly limited, figure 1 The elements constituting the circuit of the portion enclosed by the dashed-dotted line are formed on one semiconductor chip, constituting a semiconductor integrated circuit for regulator control (hereinafter referred to as regulator IC) 10 .

[0033] In the regulator IC 10 of this embodiment, a P-channel MOSFET (insulated gate field Effect transistor: hereinafter referred to as a MOS transistor), a voltage control transistor M1 is connected in series between the output terminal OUT and the ground terminal GND to which the ground potential is applied, and the bleeder resistors R1 and R2 for dividing the output voltage Vout are connected in series. The voltage VFB divided by the bleeder resistor...

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Abstract

The invention provides a semiconductor integrated circuit used for regulators, capable of improving the transient response characteristics when the output voltage is switched, without increasing a wasteful current. The semiconductor integrated circuit for regulator includes: a control transistor (M1); a voltage divider circuit generating a feedback voltage proportional to an output voltage; a control circuit (11) controlling the control transistor based on difference between the feedback voltage and a reference voltage; and a terminal through which an output voltage switching control signal is received, and being configured to switch the output voltage by varying division ratio in the voltage divider circuit in response to the signal. The semiconductor integrated circuit further includes: a discharging transistor (M4) which is connected between the output terminal and the ground (GND); and a circuit for controlling output fall (16) during switching, which outputs a signal for keeping the discharging transistor turned on over a period from change of the control signal to fall of the output voltage to an expected electric potential based on difference between the feedback voltage and the reference voltage.

Description

technical field [0001] The present invention relates to a DC power supply device, and furthermore, to a voltage regulator for converting a DC voltage, and to a series regulator (including an LDO: low-saturation regulator) which is effectively used to constitute, for example, a function of switching an output voltage Semiconductor integrated circuit (regulator IC) technology. Background technique [0002] In the DC power supply device, it is desired to switch the output voltage level so as to suppress the deterioration of the characteristics of the equipment which is the load receiving the power supply. Therefore, in conventional control semiconductor integrated circuits constituting a series regulator (series regulator), there is a structure as follows: Figure 4 As shown, a terminal for inputting and outputting a voltage switching control signal CV is provided, and the output voltage level is switched according to the state (high or low) of the output voltage switching cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
CPCG05F1/56
Inventor 寺田明广
Owner MITSUMI ELECTRIC CO LTD
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