# US 2018/0026541 A1 · Semiconductor device

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- Number: US 2018/0026541 A1
- Document ID: US20180026541A1
- Status: Published application
- Kind: A1
- Application number: 15/655,799
- Filed: 2017-07-20
- Published: 2018-01-25
- Earliest claimed: 2016-07-21
- Assignees: Renesas Electronics Corporation
- Applicants: Renesas Electronics Corporation
- Inventors: Kohei HASHIMOTO
- Web page: https://patentgrep.com/patent/US20180026541A1

## CPC

- H02M 3/158: including plural semiconductor devices as final control devices for a single load
- G05F 1/56: using semiconductor devices in series with the load as final control devices (G05F1/461 takes precedence)
- G05F 1/575: characterised by the feedback circuit
- H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P)
- G05F: SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES

## Abstract

There is to provide a semiconductor device capable of activating a circuit quickly, operating with a lower power consumption in a steady state, and coping with the dispersion of the elements. The semiconductor device includes an amplifier coupled to a power voltage, to output a voltage based on a reference voltage and a voltage of a negative feedback node, to an output node; and a voltage divider coupled to the output node, to output the divided voltage to the negative feedback node. The voltage divider includes first and second voltage dividing paths with different resistance, a first switching circuit coupled to the first and the second voltage dividing paths, in a dividing ratio adjustable way, and a second switching circuit for controlling the first and the second voltage dividing paths.

## Claims

### Claim 1

A semiconductor device comprising:
an amplifier coupled to a power voltage, to output a voltage based on a reference voltage and a voltage of a negative feedback node, to an output node; and
a voltage divider coupled to the output node, to output divided voltage to the negative feedback node, wherein
the voltage divider includes
first and second voltage dividing paths with different resistance,
a first switching circuit coupled to the first and the second voltage dividing paths, in a dividing ratio adjustable way, and
a second switching circuit for controlling the first and the second voltage dividing paths.

### Claim 2 (depends on 1)

The device according to claim 1,
wherein the voltage divider further includes a third switching circuit which couples a node with the same dividing ratio in the first and the second voltage dividing paths.

### Claim 3 (depends on 1)

The device according to claim 1,
wherein the second switching circuit includes
a first switch provided in common with the first and the second voltage dividing paths, and
a second switch provided between the first switch and the second voltage dividing path.

### Claim 4 (depends on 3)

The device according to claim 3,
wherein the second voltage dividing path has a lower resistance than the first voltage dividing path, and
wherein the first and the second switches are set to be conductive in an activation state and the second switch is set to be non-conductive in a stable state.

### Claim 5 (depends on 4)

The device according to claim 4,
wherein the first and the second switches are controlled according to a mode control signal for defining the activation state and the stable state.

### Claim 6 (depends on 1)

The device according to claim 1,
wherein the amplifier includes an adjustment circuit which adjusts an operation current of the amplifier.

### Claim 7 (depends on 6)

The device according to claim 6,
wherein the adjustment circuit includes a plurality of transistors capable of adjusting a current amount of the operation current based on the number of conductive units.

### Claim 8 (depends on 7)

The device according to claim 7,
wherein, of the transistors, the number of the conductive units in the activation state is more than the number of the conductive units in the stable state.

### Claim 9 (depends on 8)

The device according to claim 8,
wherein the transistors are controlled according to a mode control signal for defining the activation state and the stable state.

### Claim 10 (depends on 1)

The device according to claim 1,
wherein the amplifier includes a power control switch for controlling a supply of the power voltage.