300 mA LDO Using 0.94 mu A I-Q With an Additional Feedback Path for Buffer Turn-off Under Light-Load Conditions
- Title
- 300 mA LDO Using 0.94 mu A I-Q With an Additional Feedback Path for Buffer Turn-off Under Light-Load Conditions
- Author
- 노정진
- Issue Date
- 2021-03
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Citation
- IEEE ACCESS, v. 9, Page. 51784-51792
- Abstract
- This paper proposes a 300 mA low-dropout (LDO) regulator using an IQ of only 0.94 μA , which has the advantage of minimizing power consumption in the standby mode of a battery-based system. The LDO uses a source follower buffer with dynamic biasing to maintain loop stability and load transient response performance. Under light-load conditions, the buffer enters a fully-off state because there is a sub-nA bias current. Therefore, the LDO uses a dual output operational transconductance amplifier (DO-OTA) for operation under light-load conditions. The second output of the DO-OTA for light-load operation in the LDO forms an additional feedback path instead of the fully-off buffer. The second output of the DO-OTA is designed to consume a current lower than the bias current of the buffer while operating. Furthermore, the buffer in the LDO is designed for operation above 5 mA IL . While the buffer is operating, the dynamic biasing current of the buffer is used as the second output of the DO-OTA. The second output of the DO-OTA has lower output impedance characteristics than its main output, so the LDO can secure loop stability under light-load conditions by lowering the DC gain. As a result, the LDO exhibits load transient response performance up to 300 mA by using a minimal IQ under the no-load condition. The LDO is based on a 180 nm bipolar-CMOS-DMOS (BCDMOS) process and covers an area of approximately 256×143μm2 . The measured IQ is 0.94 μA under the no-load condition with a maximum load current of 300 mA.
- URI
- https://ieeexplore.ieee.org/document/9388693https://repository.hanyang.ac.kr/handle/20.500.11754/166878
- ISSN
- 2169-3536
- DOI
- 10.1109/ACCESS.2021.3069316
- Appears in Collections:
- COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > ELECTRICAL ENGINEERING(전자공학부) > Articles
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