A single-inductor bipolar-output DC/DC converter with high efficiency over wide load range for active matrix OLED

Kuei Liang Lin, Shao Siang Ng, Tzu Chi Huang, Ke-Horng Chen, Sheng Fa Liu, Pao Hsien Chiu, Sandy Chen, Chun Yu Shen, Ming Ta Hsieh, Huai An Li

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

This paper proposes a single-inductor bipolar-output (SIBO) switching converter with high efficiency over a wide load range for active matrix organic light-emitting diode (AMOLED) display. The SIBO converter provides a pair of positive and negative output voltages with only one external inductor. The proposed burst mode function can enhance the light load efficiency with low output ripples, 25mV and 10mV for positive and negative voltages, respectively. With the smooth start-up function, the inductor current can rise smoothly and have low peak value, reducing the current stress on inductor and power MOSFETs. The efficiency can be maintained higher than 80% with the load current from 20mA to 140mA. At light loads, the efficiency is higher than 60% when the load current is above 5mA. The maximum efficiency is 88% when the input voltage is 3.7V and the load current is 60mA.

Original languageEnglish
Pages (from-to)1183-1186
Number of pages4
JournalDigest of Technical Papers - SID International Symposium
Volume45
Issue number1
DOIs
StatePublished - 1 Jan 2014

Keywords

  • active matrix organic light-emitting diode (OLED)
  • DC-DC converter
  • light load
  • single-inductor bipolar-output (SIBO)
  • start-up technique

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