FS98O02B-PCE datasheet(20/50 Pages) FORTUNE

20 / 50 page

FS98O02

Rev.1.5

20/50

Note. Before turn on the 3V VGG application, please turn on the Regulator（EN_VDDA=1）first. On the other

hand, to turn on the double voltage of VDDP application, the Regulator can be turn off.

Figure 12-1: Voltage Doubler

When EN_PUMP = 1, voltage doubler is enabled. The VGG voltage is about two times of VDDP when

EN_VGG3 = 0（default） or about 3V when EN_VGG3 = 1 and EN_VDDA = 1. When EN_PUMP = 0, you can

input a voltage as voltage regulator power supply.

Voltage doubler operation frequency is selected by S_PCK. The details are described in “Voltage Doubler

Operation Frequency” on page 28.

Typical value for C1 or C2 is 1μF~10μF. For large load current, larger capacitors should be used to reduce

the output voltage ripple. If a polarity capacitor is used for C1, the CB pin should be connected to the negative

terminal of the capacitor, and the CA pin to the positive terminal.

12.2 The FS98O02A and FS98O02C Voltage Regulator

The voltage regulator is used to regulate the doubled voltage of VDDP from VGG to analog power supply,

VDDA. VDDA is the power supply voltage for analog circuit and LCD driver.

Voltage Regulator

C3 1μF

EN_VDDA

VDD

EN_VS

EN_VDDAPU

EN_VDDA25

EN_VDDA

Figure 12-2: The FS98O02A and FS98O02C Voltage Regulator

When EN_VDDA = 1, the voltage regulator will be enabled and the VDDA is about 3.6V when

EN_VDDA25 = 0（default）or about 2.5V when EN_VDDA25 = 1. Otherwise VDDA can be used as external

FS98O02B-PCE Datasheet(PDF) 20 Page - Fortune Semiconductor Corp.