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S3C8248/C8245/P8245/C8247/C8249/P8249
VOLTAGE BOOSTER
17
VOLTAGE BOOSTER
OVERVIEW
This voltage booster works for the power control of LCD : generates 3 × V
), 2 × V
), 1 × V
(V
(V
(V
).
R
LC2
R
LC1
R
LC0
This voltage booster allows low voltage operation of LCD display with high quality. This voltage booster circuit
provides constant LCD contrast level even though battery power supply was lowered.
This voltage booster include voltage regulator, and voltage charge/pump circuit.
FUNCTION DESCRIPTION
The voltage booster has built for driving the LCD. The voltage booster provides the capability of directly
connecting an LCD panel to the MCU without having to separately generate and supply the higher voltages
required by the LCD panel. The voltage booster operates on an internally generated and regulated LCD system
voltage and generates a doubled and a tripled voltage levels to supply the LCD drive circuit. External capacitor
are required to complete the power supply circuits.
The V
power line is regulated to get the V
(V
) level, which become a base level for voltage boosting. Then
R
DD
LC0
a doubled and a tripled voltage will be made by capacitor charge and pump circuit.
17-1
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