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MAX9550 Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX9550 Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 12 page High-Current VCOM Drive Buffers for TFT LCDs _______________________________________________________________________________________ 7 Applications Information Output Load Capacitor The output load capacitor must have a low ESR value (50m Ω or lower) and it must be placed as close as pos- sible to the OUT pin to ensure buffer stability (see Figure 2). Ceramic capacitors are an excellent choice. Power Supplies and Bypass Capacitors The MAX9550/MAX9551/MAX9552 operate from a 6V to 20V single supply, or from ±3V to ±10V dual supplies. Proper supply bypassing ensures stability while driving high transient loads. The MAX9550/MAX9551/MAX9552 require minimum 4.7µF (C1) and 0.1µF (C2) power-sup- ply bypass capacitors placed as close as possible to the power-supply pin (VDD). See Figure 2. For dual- supply operation, use 4.7µF and 0.1µF bypass capaci- tors on both supplies (VDD and GND) with each capacitor placed as close as possible to the VDD and GND pins. Layout and Grounding The exposed paddle on the µMAX and TSSOP pack- ages provides a low thermal resistance for heat dissi- pation. Solder the exposed paddle to a ground plane for best results. Do not route traces under these pack- ages. For dual-supply operation, the exposed paddle (EP) must be electrically connected to the negative supply or it can be left unconnected. MAX9550 16V SUPPLY *C1 = 4.7 µF CL=1 µF *C2 = 0.1 µF *PLACE 4.7 µF AND 0.1µF CAPACITORS AS CLOSE TO PIN AS POSSIBLE. NOTE: PLACE CL AS CLOSE TO THE OUT PIN AS POSSIBLE AND KELVIN SENSE THE FEEDBACK LOOP CONNECTION AS SHOWN. IN+ OUT VOUT TFT-LCD CAPACITANCE VREF VDD TFT LCD IN- GND Figure 2. Typical TFT-LCD Backplane Drive Circuit |
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