US 10,481,625 B2Granted

Voltage regulator

AssigneeAblic Inc.

InventorsTadashi Kurozo, Tomoyuki Yokoyama

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Abstract

Provided is a voltage regulator having satisfactory transient response characteristics. The voltage regulator includes: a first amplifier for detecting that undershoot occurs in an output voltage; a second amplifier for detecting that overshoot occurs in the output voltage; a first constant current circuit for increasing a bias current of an error amplifier circuit by a first amount for a first time period in response to a signal determined based on one of an output signal of the first amplifier and an output signal of the second amplifier; a second constant current circuit for increasing the bias current of the error amplifier circuit by a second amount larger than the first amount for a second time period shorter than the first time period in response to a signal determined based on the output signal of the first amplifier; and a first switch circuit for pulling up a gate of an output transistor in response to a signal determined based on the output signal of the second amplifier.

Claims10

Dependent claims

A voltage regulator, comprising:

an error amplifier circuit that amplifies a difference between a divided voltage from an output voltage of an output transistor and a reference voltage, and that outputs an amplified difference to control a gate of the output transistor;
a first amplifier connected to the divided voltage at a first terminal thereof and that detects an undershoot in the output voltage;
a second amplifier connected to the divided voltage at a first terminal thereof and that detects an overshoot in the output voltage, where the first terminal of the first amplifier has an opposite polarity to the first terminal of the second amplifier;
a first constant current circuit connected to the first amplifier and to the second amplifier and that increases a bias current of the error amplifier circuit by a first amount for a first time period in response to a signal based on one of an output signal of the first amplifier and an output signal of the second amplifier;
a second constant current circuit connected to the first amplifier and that increases the bias current of the error amplifier circuit by a second amount larger than the first amount for a second time period shorter than the first time period in response to a signal based on the output signal of the first amplifier;
and
a first switch circuit that pulls up the gate of the output transistor in response to a signal based on the output signal of the second amplifier.

4 more elements

A voltage regulator, comprising:

an error amplifier circuit that amplifies a difference between a divided voltage from an output voltage output by an output transistor and a reference voltage, and that outputs the amplified difference to control a gate of the output transistor, the error amplifier circuit comprising a first amplifier stage that receives the divided voltage and the reference voltage, and a second amplifier stage that includes a bias circuit and that controls the output transistor;
an undershoot improvement circuit comprising an amplifier for detecting that undershoot occurs in the output voltage, the undershoot improvement circuit configured to operate to improve the undershoot occurring in the output voltage;
and
a first constant current circuit that increases a bias current of the error amplifier circuit by a first amount for a first time period longer than an operating time period of the undershoot improvement circuit in response to a signal based on an output signal of the amplifier.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 16/003,983Filed 8 Jun 2018 · division
Priority: JP 2013-11566531 May 2013
Published: US 2018/0292854 A111 Oct 2018
Granted: 19 Nov 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification2 codes

G05F 1/575
Using semiconductor devices in series with the load as final control devices: characterised by the feedback circuit
G05F
Systems for regulating electric or magnetic variables

Family

Application14/287,999Parent of this division · filed 27 May 2014
US 2018/0292854 A1Pre-grant publication · published 11 Oct 2018
US 10,061,335 B2Parent of this division
US 2014/0354249 A1Published application
US 10,481,625 B2This patent

From the US filing history. Foreign family members aren’t listed.

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