AT5517

Global Mixed-mode Technology AT5517 Integrated Power Solution for TFT-LCD Features „ 2.5V to 5.5V Input Supply Range „ 1.2MHz Current-Mode Step-Up Converter „ Built-In 18V, 3A 0.2Ω n-Channel MOSFET „ Charge Pumps for VGON and VGOFF „ High Voltage Switch with Adjustable Delay „ Thermal Overload Protection „ TQFN4X4-24 Package Applications „ LCD Monitor Panels „ Notebook Computer Displays „ LCD TVs General Description The AT5517 includes a step-up converter, two charge pumps, and a high current operational amplifier for TFT LCD. Also included are a logic-controlled high-voltage switch with adjustable delay and an open drain output reset comparator. The step-up DC/DC converter provides the regulated power supply for the panel source driver IC. The converter is a high performance current-mode regulator with operating frequency at 1.2MHz. It also provides fast transient response and high efficiency. The charge pumps in AT5517 regulate TFT gate-on and gate-off power supplies. ...