AAT1118B

AAT1118/A/B Details are subject to change without notice. ADJUSTABLE TRIPLE-CHANNEL TFT LCD DC-DC CONVERTER Features Built in 1.6A, 0.2 Switching NMOS Fault and Thermal Protection Internal Soft-Start Function Internal Power Up Sequencing Dual Adjustable Charge Pump Output Positive Output to 40V Negative Output to − 40V Power Good Output TSSOP-16 Package General Description The AAT1118/A/B is an adjustable triple-channel TFT LCD DC-DC converter that provides one current mode PWM, one positive charge pump and one negative charge pump. Built-in functions include soft-start and power up sequencing. When power is turned on, soft-start avoids inrush current. Power up sequencing feature provides compensation for LCD panel to maintain a smooth voltage during a turn-on cycle. The DC-DC converter consists of an on-chip voltage reference, error amplifier, current sense, pulse width modulation controller, under-voltage lockout protection, thermal detect, soft-start, and fault protection circuit. When the two charge pumps are in operation, the GND1 SW GND2 Pin Configuration (Top View) PGO IN1 EO 1 2 3 4 5 6 7 8 16 15 output voltage would be doubled and the generated VP3 and VP2 (Note 1) could switch on or off TFT gate. With the minimal external components, the AAT1118/A/B offers a simple and economical solution for TFT LCD power. VDD GND AAT1118/A/B 14 13 12 11 10 9 VDD2 / VCH3 OUT3 VREF IN3 IN2 VDD1 OUT2 SHDN Note 1: Please refer to page 13 and 14 for VP3 and VP2. (TSSOP-16 P...