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| Maxim MAX16928汽车TFT-LCD显示器电源解决方案 | |||||
作者：Maxim 文章来源：Maxim 点击数： 更新时间：2011-12-1  |
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The MAX16928 is a highly integrated power supply for automotive TFT-LCD applications. The device integrates one boost converter, one 1.8V/3.3V regulator controller, and two gate voltage regulators. The device comes in several versions to satisfy common automotive TFT-LCD power-supply requirements. The boost converter uses spread-spectrum modulation to reduce peak interference and to optimize EMI performance. The sequencing input (SEQ) allows flexible sequencing of the positive-gate and negative-gate voltage regulators. The power-good indicator (PGOOD) indicates a failure on any of the converters or regulator outputs. Integrated thermal shutdown circuitry protects the device from overheating. The MAX16928 is available in a 20-pin TSSOP package with exposed pad and operates over the -40NC to +105NC temperature range. MAX16928主要特性: High-Power (Up to 6W) Boost Output Providing Up to 18V 1.8V or 3.3V Regulator Provides 500mA with External npn Transistor One Positive-Gate Voltage Regulator Capable of Delivering 20mA at 28V One Negative-Gate Voltage Regulator High-Frequency 2.2MHz Operation Flexible Stand-Alone Sequencing True Shutdown™ Boost Converter Internal Soft-Start Overtemperature Shutdown -40NC to +105NC Operation AEC-Q100 Qualified MAX16928应用: Applications Automotive Dashboards Automotive Central Information Displays Automotive Navigation Systems  图1.MAX16928升压转换器功能框图  图2.MAX16928典型应用电路图 MAX16928评估板 The MAX16928 evaluation kit (EV kit) is a fully assembled and tested surface-mount PCB that provides the voltages and features required for automotive thin-film transistor (TFT), liquid-crystal display (LCD) applications. The EV kit includes a boost converter, a 3.3V regulator controller with external npn transistor, two gate voltage regulators, a single-stage positive charge pump, and a single-stage negative charge pump. The EV kit can operate from 4.5V to 5.5V input voltages and is optimized for automotive TFT-LCD applications. The boost converter is configured for a 12V output that provides at least 400mA. The regulator controller output is 3.3V and provides at least 500mA. The positive-gate voltage regulator provides 18V output and the negative-gate voltage regulator provides -5.9V. MAX16928评估板主要特性: 4.5V to 5.5V Input Range Output Voltages 12V Output at 400mA (Boost Converter) 3.3V Output at 500mA (Regulator Controller) 18V Output (Positive-Gate Voltage Regulator) -5.9V Output (Negative-Gate Voltage Regulator) High-Frequency Operation 2.2MHz (Boost Converter) Single-Stage Positive and Negative Charge Pumps Proven PCB Layout Fully Assembled and Tested  图3.MAX16928评估板电路图 MAX16928评估板材料清单(BOM):    图4.MAX16928评估板PCB布局图 详情请见: http://datasheets.maxim-ic.com/en/ds/MAX16928.pdf 和 http://datasheets.maxim-ic.com/en/ds/MAX16928EVKIT.pdf |
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