Single-Transistor-Control Low-Dropout Regulator單晶體管控制低壓差穩壓器
Low-dropout regulator is a commonly used component in the power management integrated circuits for portable electronic devices. Conventionally, the stability of the regulator was achieved by frequency compensation such as dominant-pole compensation and pole-zero cancellation. However, this limits the choices of combinations of the output capacitance and its series-equivalent-resistance. Optimization between stability and transient response is difficult to achieve simultaneously.
This invention provides a low-dropout regulator with an ultra-low output resistance, which improves stability and load regulation, even a pass transistor operates in saturation region with a high output resistance. With its dynamic resistance, undershoot and overshoot are minimized, hence achieving a better transient response. Moreover, a simple circuit configuration is used with only a single transistor as a control element, the transient response, load regulation and stability are improved.
This invention is widely applicable in power management integrated circuits for portable electronic devices such as mobile phones, PDAs, MD players and laptop computers.
1. Smaller silicon area
2. Off-chip capacitor free
3. Lower voltage and higher power-conversion efficiency
4. Local on-chip and high power-conversion efficiency
5. Improved transient response
6. Simple circuit configuration
- Power management integrated circuits for portable electronic devices such as mobile phones, PDAs,
MP3 players and laptop computers
Patent Number: USRE42335E1
Application Number: US2009605206A
Inventor: Man, Tsz Yin | Leung, Chi Yat | Leung, Ka Nang | Mok, Philip Kwok Tai | Chan, John Man Sun
Priority Date: 7 Mar 2005
Priority Number: USRE42335E1
Application Date: 23 Oct 2009
Publication Date: 10 May 2011
IPC Current: G05F000140
US Class: 323274 | 323224 | 323281
Assignee Applicant: The Hong Kong University of Science & Technology
Title: Single-transistor control low-dropout regulator | Single transistor-control low-dropout regulator
Usefulness: Single-transistor control low-dropout regulator | Single transistor-control low-dropout regulator
Summary: For accepting unregulated input voltage and providing a regulated output voltage that is nearly independent of the output current.
Novelty: Low dropout regulator for providing regulated output voltage, has control transistor with electrode connected to output terminal, second electrode biased with control voltage, and third electrode connected to DC biasing circuit
電子
電路設計
23 Oct 2009
US 12/605206
US RE42335
TTC.PA.250S
香港
