The VCOM voltage of an LCD panel needs to be adjusted to

remove flicker. The ISL45042 can be used to digitally adjust

a panel’s VCOM voltage by controlling its output sink current.

The output of the ISL45042 is connected to an external

voltage divider and an external VCOM buffer amplifier. In this

application, the user can control the VCOM voltage with 7-bit

accuracy (128 steps). Once the desired VCOM setting is

obtained, the settings can be stored in the non-volatile

EEPROM memory, which would then be automatically

recalled during every power-up.

The VCOM adjustment and non-volatile memory

programming is through a single interface pin (CTL). Once

the desired programmed value is obtained, the Counter

Enable pin (CE) can be used to prevent further adjustment

or programming.

The full-scale sink current of the ISL45042 is set using an

external resistor connected to the SET pin. The full-scale

sink current determines the lowest voltage of the external

voltage divider.

The ISL45042 is available in an 8 Ld 3mmx3mm TDFN

package with a maximum thickness of 0.8mm for ultra thin

LCD panel design.

Features

• 128-Step Adjustable Sink Current Output

• 2.6V to 3.6V Digital Supply Voltage Operating Range

(3.0V Minimum Programming Voltage)

• 4.5V to 20V Analog Supply Voltage Operating Range

(10.8V Minimum Programming Voltage)

• Rewritable EEPROM for Storing the Optimum VCOM Value

• Output Adjustment Enable/Disable Control

• Output Guaranteed Monotonic Over-Temperature

• Two Pin Adjustment, Programming and Enable

• Ultra Thin 8 Ld 3mmx3mm DFN (0.8mm Max)

• Pb-Free (RoHS Compliant)

Applications

• LCD Panels