Samsung S3C8245 User Manual

This voltage booster works for the power control of LCD : generates 3 

×

 V

R

(V

LC2

), 2 

×

 V

R

(V

LC1

), 1 

×

 V

R

(V

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.

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

DD

 power line is regulated to get the V

LC0

(V

R

) level, which become a base level for voltage boosting. Then a

doubled and a tripled voltage will be made by capacitor charge and pump circuit.