US5864227A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage regulator with output pull-down circuit
Assignee: Texas Instruments Inc
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Filing: 1998-03-12
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Granted: 1999-01-26
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Expires: 2018-03-12
Abstract
Abstract A voltage regulator circuit includes: an output transistor MP X coupled between a voltage supply node V CC and an output node V OUT ; an amplifier A 1 coupled to the output transistor MP X for controlling the response of the output transistor MP X ; feedback circuitry R 1 and R 2 connected between the output node V OUT and the amplifier A 1 , the feedback circuitry R 1 and R 2 providing feedback to the amplifier A 1 ; and a pull-down circuit PD 1 coupled to the output node V OUT .
Inventors
- 👤 Robert B. Borden
- 👤 Mark Pulkin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:03
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/46; G05F1/618; G05F3/00; G05F3/02; G05F3/08; G05F3/10; G05F3/16; G05F3/20; G05F3/24; G05F3/242; G05F3/247
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
102 words
A voltage regulator circuit comprising: an output transistor coupled between a voltage supply node and an output node; an amplifier coupled to the output transistor for controlling the response of the output transistor; feedback circuitry connected between the output node and the amplifier, the feedback circuitry providing feedback to the amplifier; a pull-down transistor coupled to the output node; and a comparator coupled to the pull-down transistor for controlling the response of the pull-down transistor, a first input of the comparator is coupled to an output of the amplifier and a second input of the comparator is coupled to a reference node.
Claim 2
Dependent Claim
102 words
A voltage regulator circuit comprising: an output transistor coupled between a voltage supply node and an output node; an amplifier coupled to the output transistor for controlling the response of the output transistor; feedback circuitry connected between the output node and the amplifier, the feedback circuitry providing feedback to the amplifier; a pull-down transistor coupled to the output node; and a comparator coupled to the pull-down transistor for controlling the response of the pull-down transistor, a first input of the comparator is coupled to an output of the amplifier and a second input of the comparator is coupled to a reference node.
Claim 3
Dependent Claim
63 words
The circuit of claim 1, wherein the feedback circuitry includes a first resistor and a second resistor connected in series, the output transistor is coupled to a first end of the first resistor, a second end of the first resistor is coupled to a first end of the second resistor, and the amplifier is coupled to the first end of the second resistor.
Claim 4
Dependent Claim
15 words
The circuit of claim 1, further comprising a reference voltage source coupled to the amplifier.
Claim 5
Dependent Claim
129 words
A voltage regulator circuit comprising: an output MOS transistor having a gate, a source, and a drain; an amplifier coupled to the gate of the MOS transistor; feedback circuitry coupled to the drain of the MOS transistor; a feedback line coupling the feedback circuitry to a first input of the amplifier; a reference voltage source coupled to a second input of the amplifier; a supply voltage coupled to the source of the MOS transistor; a pull-down MOS transistor coupled to the output node; and a comparator coupled to the pull-down MOS transistor for controlling the response of the pull-down MOS transistor, a first input of the comparator is coupled to an output of the amplifier and a second input of the comparator is coupled to a trip voltage node.
Claim 6
Dependent Claim
129 words
A voltage regulator circuit comprising: an output MOS transistor having a gate, a source, and a drain; an amplifier coupled to the gate of the MOS transistor; feedback circuitry coupled to the drain of the MOS transistor; a feedback line coupling the feedback circuitry to a first input of the amplifier; a reference voltage source coupled to a second input of the amplifier; a supply voltage coupled to the source of the MOS transistor; a pull-down MOS transistor coupled to the output node; and a comparator coupled to the pull-down MOS transistor for controlling the response of the pull-down MOS transistor, a first input of the comparator is coupled to an output of the amplifier and a second input of the comparator is coupled to a trip voltage node.
Claim 7
Dependent Claim
14 words
The circuit of claim 4 wherein the output MOS transistor is a PMOS transistor.
Claim 8
Dependent Claim
14 words
The circuit of claim 4 wherein the pull-down MOS transistor is a PMOS transistor.
Claim 9
Dependent Claim
20 words
The circuit of claim 4, wherein the feedback circuitry includes a first resistor and a second resistor connected in series.
Claim 10
Dependent Claim
54 words
The circuit of claim 7, wherein the drain of the output MOS transistor is coupled to a first end of the first resistor, a second end of the first resistor is coupled to a first end of the second resistor, and the feedback line is coupled to the first end of the second resistor.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-01-25 | 2002-07-27 | 2003-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-01-25 | 2006-07-27 | 2007-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-01-25 | 2010-07-27 | 2011-01-26 | $7700.00 | Window Closed / Lapsed |