High efficiency on-chip charge pump DC–DC converter for LCD drivers

An on-chip charge pump (CP) DC–DC converter applicable to potable displays is described. A merged 2×/3× booster eligible for both single-phase pumping and dual-phase pumping is developed. A closed-loop sensing scheme with analog/digital mixed-mode voltage regulation helps to ensure a low ripple outp...

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Bibliographic Details
Published inCurrent applied physics Vol. 7; no. 4; pp. 450 - 455
Main Authors Song, Hasun, Ko, Ju-Hyun, Kim, Daejeong
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.05.2007
Subjects
Charge pump
DC–DC converter
Efficiency
LCD drivers
On-chip
On-chip
85.40.–e
84.30.–r
Charge pump
Efficiency
DC–DC converter
LCD drivers
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Summary:An on-chip charge pump (CP) DC–DC converter applicable to potable displays is described. A merged 2×/3× booster eligible for both single-phase pumping and dual-phase pumping is developed. A closed-loop sensing scheme with analog/digital mixed-mode voltage regulation helps to ensure a low ripple output voltage and high power transfer efficiency. A test vehicle was implemented for a DC input range of 2.2–3.6V and the DC output of 5V with a load condition of 20mA in a standard 0.35-μm 2poly-4metal CMOS process. The test results reveal output ripple of less than 80mV and efficiency of 77.4% in the 2× dual phase mode.
ISSN:1567-1739
1878-1675
DOI:10.1016/j.cap.2006.09.026