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Maxim公司的MAX16928是具有升壓轉換器和柵極電壓穩壓器的汽車TFT-LCD顯示器電源解決方案,集成了一個升壓轉換器,一個1.8V/3.3V穩壓控制器和兩個柵極電壓穩壓器(一個28V提供20mA,一個負柵極電壓).高達6W的大功率升壓輸出,輸出電壓高達18V,工作頻率2MHz,主要用在汽車儀表盤,信息顯示器和導航系統.本文介紹了MAX16928主要特性,方框圖, 典型應用電路圖和MAX16928評估板主要特性,電路圖,材料清單與PCB布局圖. The MAX16928 is a highly integrated power supply for automotive TFT-LCD applications. The device inte grates 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 over heating. The MAX16928 is available in a 20-pin TSSOP pack age 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應用: Applications Automotive Dashboards Automotive Central Information Displays Automotive Navigation Systems 
圖1.MAX16928升壓轉換器功能框圖
圖2.MAX16928典型應用電路圖 MAX16928評估板 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評估板主要特性: 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
圖3.MAX16928評估板電路圖 MAX16928評估板材料清單(BOM):
圖4.MAX16928評估板PCB布局圖 詳情請見: 
MAX16928.pdf
(1.81 MB)
MAX16928EVKIT.pdf
(935.18 KB)
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