原标题：Maxim MAX16928汽车TFT-LCD显示器电源解决方案

　　Maxim公司的MAX16928是具有升压转换器和栅极电压稳压器的汽车TFT-LCD显示器电源解决方案,集成了一个升压转换器,一个1.8V/3.3V稳压控制器和两个栅极电压稳压器(一个28V提供20mA,一个负栅极电压).高达6W的大功率升压输出,输出电压高达18V,工作频率2MHz,主要用在汽车仪表盘,信息显示器和导航系统.本文介绍了MAX16928主要特性,方框图, 典型应用电路图和MAX16928评估板主要特性,电路图,材料清单与PCB布局图.

　　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):