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- Title
High-efficient inverting buck-boost converter with fully digital-controlled switch width modulation for microdisplays.
- Authors
Shin, S.-H.; Hong, S.-K.; Kwon, O.-K.
- Abstract
This letter proposes a highly efficient inverting buck-boost converter at light-load for microdisplay applications. The proposed buck-boost converter, which operates in discontinuous conduction mode, achieves high efficiency by modulating the switch width according to the sensed on-duty of the main power switch using the full-digital method. It generates an output voltage of -4 V using an input voltage of 1.8 V for a maximum load current (ILOAD) of 20 mA. The proposed converter was fabricated in a 0.18 μm bipolar CMOS DMOS (BCDMOS) process and measured to verify its performance. The measurement results showed that the proposed buck-boost converter achieved a maximum efficiency of 89.3% at ILOAD of 20 mA and a high efficiency of up to 81.9% at light-load, where ILOAD is <5 mA.
- Subjects
ELECTRIC current converters; ELECTRIC potential; COMPLEMENTARY metal oxide semiconductors; MICRODISPLAYS; ELECTRIC currents
- Publication
Electronics Letters (Wiley-Blackwell), 2018, Vol 54, Issue 5, p309
- ISSN
0013-5194
- Publication type
Article
- DOI
10.1049/el.2017.4561