AAT1168A

Advanced Analog Technology, Inc. May 2008 AAT1168/1168A/1168B Product information presented is current as of publication date. Details are subject to change without notice. TRIPLE-CHANNEL TFT LCD POWER SOLUTION WITH OPERATIONAL AMPLIFIERS FEATURES Built in 3A, 0.2Ω Switching NMOS www.DataSheet4U.com Positive LDO Driver GENERAL DESCRIPTION The AAT1168/AAT1168A/AAT1168B is a triple-channel TFT LCD power solution that provides a step-up PWM controller, two LDO drivers (one for positive high voltage and one for negative voltage), five operational amplifiers, and one high voltage switch up to 28V for TFT LCD display. The PWM controller consists of an on-chip voltage reference, oscillator, error amplifier, current sense circuit, comparator, under-voltage lockout protection and internal soft-start circuit. The thermal and power fault protection prevents internal circuit being damaged by excessive power. The LDO drivers generate two regulated output voltage set by external resistor dividers. VGH voltage does not activate until DLY voltage exceeds 1.25V. The AAT1168/AAT1168A/AAT1168B contains 4+1 operational amplifiers. VO1, VO2, VO4, and VO5 are for Up to 28V/5mA Negative LDO Driver Down to −14V/5mA 1 VCOM and 4 VGAMMA Operational Amplifiers 28V High Voltage Switch for VGH Internal Soft-Start Function 1.2MHz Fixed Switching Frequency 3 Channels Fault and Thermal Protection Low Dissipation Current QFN-32 Package Available PIN CONFIGURATION VOUT3 1 VREF 2 24 EO 23 IN1 gamma c...