© The Institution of Engineering and Technology
A DC–DC switching converter chip is proposed to generate both positive and negative voltages for active-matrix LCD (AMLCD) bias. An inductive boost converter and two inverting charge pumps are integrated in a proposed chip by using a 0.5 µm 5 V, 3.5 µm 30 V CMOS process. A conventional scheme used to bias AMLCD employs a switching-boost converter with several off-chip components to generate the required positive and negative voltages. The circuit proposed in this study achieves high performance with a minimum number of off-chip components. Additionally, the proposed method is capable of generating a wide range of negative voltages by varying the reference voltage to supply optimised power for the AMLCD system. Because the supply voltage of the developed inverting charge pump is supplied by the output voltage of the boost converter through a linear regulator, the operations of switching-boost converter and inverting charge pump are independent and are without cross-regulation problems. The boost converter's input power supply range is 2.8–5.5 V, the output voltage range is 10–20 V and the clock frequency is 780 kHz. The maximum efficiency is 84% with the input power supply at 5.5 V, an output voltage of 10 V and a load current of 100 mA. The integrated inverting charge pumps have two outputs that generate −2× and −4× the reference voltage. The overall core size is 2150 µm×2150 µm.
References
-
-
1)
-
F. Ishihara ,
F. Sheikh ,
B. Nikolic
.
Level conversion for dual-supply systems.
IEEE Trans. VLSI Syst.
,
2 ,
185 -
195
-
2)
-
S.H. Kulkarni ,
D. Sylvester
.
High performance level conversion for dual VDD design.
IEEE Trans. VLSI Syst.
,
9 ,
926 -
936
-
3)
-
W. Sun ,
L. Shi ,
Z. Sun ,
Y. Yi ,
H. Li ,
S. Lu
.
High-voltage power IC technology with nVDMOS, RESURF pLDMOS, and novel level-shift circuit for PDP scan-driver IC.
IEEE Trans. Electron Devices
,
4 ,
891 -
896
-
4)
-
B. Razavi
.
(2002)
Design of analog CMOS integrated circuits.
-
5)
-
‘LT3467/LT3467A.: 1.1A step-up DC/DC converter in thinSOT with integrated soft-start’, 2003, http://www.linear.com.
-
6)
-
C. Shi ,
B.C. Walker ,
E. Zeisel ,
B. Hu ,
G.H. McAllister
.
A highly integrated power management IC for advanced mobile applications.
IEEE J. Solid-State Circuits
,
8 ,
1723 -
1731
-
7)
-
A.J. Stratakos ,
S.R. Sanders ,
R.W. Brodersen
.
A low-voltage CMOS DC–DC converter for a portable battery-operated system.
Proc. IEEE Power Electron. Specialists Conf.
,
619 -
626
-
8)
-
A. Monte ,
J. Doutreloigne ,
A.V. Calster
.
Driving-scheme algorithms for intelligent energy-efficient high-voltage display drivers.
IEEE Trans. Cirsuits Syst. I
,
2 ,
497 -
507
-
9)
-
D.S. Ma ,
W.-H. Ki ,
C.-Y. Tsui ,
P.K.T. Mok
.
Single-inductor multiple-output switching converters with time-multiplexing control in discontinuous conduction mode.
IEEE J. Solid-State Circuits
,
1 ,
89 -
100
-
10)
-
P.E. Allen ,
D.R. Holberg
.
(2002)
CMOS analog circuit design.
-
11)
-
C.-C. Yu ,
W.-P. Wang ,
B.-D. Liu
.
A new level converter for low-power applications.
IEEE Int. Symp. Circuit Syst.
,
1 ,
113 -
116
-
12)
-
‘TPS65165.: Compact LCD bias IC with high speed amplifiers for TV and monitor TFT-LCD panels’, 2007, http://www.ti.com.
-
13)
-
H.-P. Le ,
C.-S. Chae ,
K.-C. Lee ,
S.-W. Wang ,
G.-H. Cho ,
G.-H. Cho
.
A single-inductor switching dc–dc converter with five outputs and ordered power-distributive control.
IEEE J. Solid-State Circuits
,
12 ,
2706 -
2714
-
14)
-
‘TPS65146.: Compact LCD bias IC with LDO, VCOM buffer and reset function’, 2008, http://www.ti.com.
-
15)
-
C.-S. Chae ,
H.-P. Le ,
K.-C. Lee ,
G.-H. Cho ,
G.-H. Cho
.
A single-inductor step-up dc–dc switching converter with bipolar outputs for active matrix OLED mobile display panels.
IEEE J. Solid-State Circuits
,
2 ,
509 -
524
http://iet.metastore.ingenta.com/content/journals/10.1049/iet-cds.2008.0340
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