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Voltage regulator

A voltage regulator and voltage technology, applied in the direction of regulating electrical variables, control/regulating systems, instruments, etc., can solve the problems of no standby operation, no reverse current flow of Pch transistors, etc., and achieve the effect of low current consumption

Active Publication Date: 2011-04-27
SEIKO INSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, in the conventional voltage regulator, there is a problem that when the potential on the VDD terminal 121 side becomes zero, the current of the backup battery flows through the resistors 1103 and 1104, so a long-term backup operation cannot be performed.
[0010] In addition, there is another problem that when the potential on the side of the VDD terminal 121 becomes zero, the Pch transistor 103 cannot be turned off and a reverse current flows.

Method used

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Examples

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Embodiment 1

[0032] figure 1 is a circuit diagram showing the voltage regulator of the first embodiment of the present invention. The voltage regulator of the present invention is composed of the following parts: Vref circuit 101, error amplifier 102, comparison circuit 130, resistor 107, resistor 108, Pch (P channel) transistor 103, Pch transistor 104, Pch transistor 105, Pch transistor 106, Nch (N channel) transistor 109 , VDD terminal 121 , VSS terminal 123 , and output terminal 122 . and Figure 11 The difference is that the comparator 1105 and the resistors 1101 , 1102 , 1103 , and 1104 are deleted, and the comparison circuit 130 is used to control the Pch transistors 105 , 106 and the added Pch transistor 104 .

[0033] figure 2 The comparison circuit of the present invention is shown.

[0034] The comparison circuit 130 is composed of the following parts: a constant current circuit 203 , a constant current circuit 204 , a Pch transistor 201 , a Pch transistor 202 , an inverter ...

Embodiment 2

[0047] image 3 show figure 1 The second embodiment of the comparison circuit 130 of the voltage regulator of the present invention. The comparison circuit 130 of the second embodiment is composed of the following parts: constant current circuit 303, constant current circuit 304, Pch transistor 201, Pch transistor 301, Pch transistor 302, Pch transistor 305, inverter 205, inverter 206, inverter A phaser 208 and a level shifter 207 are formed. and figure 2 The difference is that the part corresponding to the Pch transistor 202 is composed of two transistors, the Pch transistor 301 and the Pch transistor 302, and a Pch transistor 305 for realizing the hysteresis function is added. In addition, the constant current circuit 203 and the constant current circuit 204 are specifically represented by N-channel depletion type MOS transistors whose gates and sources are connected to the VSS terminal 123 .

[0048]Next, the connection of the comparison circuit 130 will be described....

Embodiment 3

[0060] Figure 5 show figure 1 The third embodiment of the comparison circuit 130 of the voltage regulator of the present invention. The comparison circuit 130 of the third embodiment is composed of the following parts: constant current circuit 303, constant current circuit 304, Pch transistor 202, Pch transistor 501, Pch transistor 502, Pch transistor 503, inverter 205, inverter 206, inverter Phaser 208 and level shifter 207. and figure 2 The difference is that the portion corresponding to the Pch transistor 201 is composed of two transistors, a Pch transistor 501 and a Pch transistor 502, and a Pch transistor 503 for realizing a hysteresis function is added. Additionally, with image 3 Similarly, the constant current circuit 203 and the constant current circuit 204 are specifically represented by N-channel depletion MOS transistors whose gates and sources are connected to the VSS terminal 123 .

[0061] Next, the connection of the comparison circuit 130 will be descri...

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PUM

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Abstract

The invention provides a voltage regulator which can prevent reverse current from an output terminal (122) with low current consumption regardless of the voltage of a VDD terminal (121). Low current consumption can be realized through a circuit structured in such a manner that no resistor voltage divider is used in a comparison circuit which compares the voltage of the VDD terminal (121) of the voltage regulator with the voltage of the output terminal (122).

Description

technical field [0001] The invention relates to a voltage regulator with output terminals connected to a backup battery. Background technique [0002] As an existing voltage regulator whose output terminal is connected to the backup battery 112, Figure 11 The circuit shown is known (for example, refer to Patent Document 1). [0003] A power supply voltage is applied between the VDD terminal 121 and the VSS terminal 123 . Since the output terminal 122 is connected to the backup battery 112, even if the power supply voltage between the VDD terminal 121 and the VSS terminal 123 becomes zero, the load 113 (for example, RAM) at the output terminal 122 can continuously supply voltage. [0004] When a power supply voltage is supplied between the VDD terminal 121 and the VSS terminal 123 , VBAT1 is the voltage between the terminals and VBAT2 is the voltage of the backup battery, VBAT1 > VBAT2 in normal cases. When a power supply voltage is supplied between the VDD terminal 121...

Claims

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Application Information

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IPC IPC(8): G05F1/56
CPCG05F1/56G05F3/262
Inventor 须藤稔二瓶洋太朗
Owner SEIKO INSTR INC
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