Invention Grant
- Patent Title: Low-dropout voltage regulator apparatus capable of adaptively adjusting current passing through output transistor to reduce transient response time and related method thereof
- Patent Title (中): 低压差稳压器装置能够自适应地调节通过输出晶体管的电流以减少瞬态响应时间及其相关方法
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Application No.: US14205395Application Date: 2014-03-12
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Publication No.: US09261892B2Publication Date: 2016-02-16
- Inventor: Tsun-Hsin Wang , Chiao-Hsing Wang
- Applicant: Silicon Motion Inc.
- Applicant Address: TW Jhubei, Hsinchu County
- Assignee: Silicon Motion Inc.
- Current Assignee: Silicon Motion Inc.
- Current Assignee Address: TW Jhubei, Hsinchu County
- Agent Winston Hsu; Scott Margo
- Priority: TW102110060A 20130321
- Main IPC: G05F1/56
- IPC: G05F1/56 ; G05F1/575
Abstract:
A low-dropout voltage regulator apparatus includes a voltage source circuit, an error amplifier, an output transistor, a resistor-capacitor circuit, a detection circuit, and a current adjusting circuit. The voltage source circuit generates a reference voltage signal and at least one threshold voltage signal. The error amplifier receives the reference voltage signal and a feedback voltage signal to generate an output control signal. The output transistor provides an output current for the output terminal according to the output control signal. The resistor-capacitor circuit generates the feedback voltage signal using voltage dividing according to a voltage corresponding to the output current. The detection circuit compares at least one threshold voltage signal with the output voltage to generate at least one control voltage signal. The current adjusting circuit adaptively adjusts the current passing though the output transistor to decrease the transient response time according to the at least one control voltage signal.
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