The AAT1217 is a highly integrated power management IC for TFT LCD panels.  The device provides a boost regulator, a VGH charge pump, a VGL charge pump, eight-channel level shifters, a I2C interface, making the AAT1217 an ideal device for use in TFT LCD applications.
The AAT1217 current mode boost regulator accepts an input voltage ranging from 3V to 6V, and can provide an output voltage of up to approximately 19V. The regulator switches at a fixed frequency (640kHz or 1.2MHz selectable), and integrates a low RDSON (0.2Ω typical) NMOS power switch, thereby minimizing board space while providing good efficiency. Externally programmed soft start minimizes inrushes and output overshoots. The boost also includes protection features such as OCP, OVP, and fault protection.
The VGL and VGH provide gate direr voltage. And the VGH voltage with temperature compensated can be set by adjusting the RNTC and FBPH resistors. A programmable VCOM generator, and an 8-channel level shifter in a single IC. I2C interface can be set with 7-Bit accuracy (128 steps). The settings can be stored in the EEPROM and recalled during power up. In addition to the above functions, the AAT1217 generates two signals to discharge the display panel during power-off.
The AAT1217 is available in a small WQFN 56 pin  with a bottom side exposed thermal pad to provide optimal heat dissipation. The device is rated to operated from –40°C to +85°C temperature range.