ST7533 datasheet(21/60 Pages) SITRONIX

21 / 60 page

ST7533

Ver 1.0

21/60

2003/07/21

VSS2

VOUT

CAP3-

CAP1+

CAP1-

CAP2-

CAP2+

VSS2

VOUT

CAP3-

CAP1+

CAP1-

CAP2-

CAP2+

VSS2

VOUT

CAP3-

CAP1+

CAP1-

CAP2-

CAP2+

OPEN

4x step-up voltage circuit

3x step-up voltage circuit

2x step-up voltage circuit

VDD=0V

VSS2=-3V

VOUT=4xVSS2=-12V

4x step-up voltage relationships

VDD=0V

VSS2=-3V

VOUT=3xVSS2=-9V

3x step-up voltage relationships

VDD=0V

VSS2=-3V

VOUT=2xVSS2=-6V

2x step-up voltage relationships

Figure 7

* The VSS2 voltage range must be set so that the VOUT terminal voltage does not exceed the absolute maximum rated value.

The Voltage Regulator Circuit

The step-up voltage generated at VOUT outputs the LCD

driver voltage V5 through the voltage regulator circuit.

Because the ST7533 chips have an internal high-accuracy

fixed voltage power supply with a 64-level electronic volume

function and internal resistors for the V5 voltage regulator,

systems can be constructed without having to include

high-accuracy voltage regulator circuit components.

(VREG thermal gradients approximate -0.15%/°C)

ST7533 Datasheet(PDF) 21 Page - Sitronix Technology Co., Ltd.

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