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TFT-LCD DC-DC Converter Saves Space and Cost by Integrating Five Operational Amplifiers
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Note to Editor:
- The MAX8795A is a TFT-LCD DC-DC converter with integrated operational amplifiers.
- This converter saves both space and cost.
- Advanced design and process technologies enable the MAX8795A's high integration of multiple analog functions at a low cost.
- The MAX8795A is ideal for LCD TV and monitor displays.
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SUNNYVALE, CA—June 25, 2007—Maxim Integrated Products (NASDAQ: MXIM) introduces the MAX8795A TFT-LCD DC-DC converter. This device saves both space and cost by integrating a high-performance step-up regulator, two linear-regulator controllers, five high-current operational amplifiers, and a logic-controlled, high-voltage switch with adjustable delay in a small 25mm2 footprint. Designed to drive the LCD backplane (VCOM) and/or gamma-correction divider string, the high-performance operational amplifiers feature a high ±130mA output current, fast 45V/µs slew rate, wide 20MHz bandwidth, and rail-to-rail operation on the input and output. The high integration and performance of the MAX8795A, combined with its low cost and small size, make it ideal for active-matrix, TFT-LCD TV and monitor display applications.
To further reduce solution size, the MAX8795A utilizes a 1.2MHz high-frequency current-mode regulator with an integrated 20V n-channel MOSFET. This converter provides a regulated supply voltage for panel source drivers, and it delivers fast transient response to pulsed loads while achieving efficiencies over 85%. Its high frequency enables the use of ultra-small inductors and ceramic capacitors. Additionally, the MAX8795A integrates gate-on and gate-off linear-regulator controllers that provide regulated, TFT gate-on and gate-off supplies using external charge pumps attached to the switching node. These power supplies utilize a high-voltage-switch control matrix to improve system operation and efficiency while powering the LCD-panel row drivers.
Available in a small, 5mm x 5mm x 0.8mm, 32-pin TQFN package, the MAX8795A is fully specified over the -40°C to +85°C temperature range. Prices start at $3.90 (1000-up, FOB USA). An evaluation kit that includes recommended external components is available to reduce design time.
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