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Maxim 公司的MAX16929是用于汽車TFT-LCD的高度集成電源器件,它集成了一個降壓轉換器,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.工作電壓4V-28V(降壓)或3V-5.5V(升壓),高達6W的升壓輸出達18V,高頻開關工作:2.1MHz (降壓轉換器),2.2MHz (升壓轉換器),主要用在汽車儀表盤,汽車導航系統和汽車中心信息顯示器.本文介紹了MAX16929主要特性,方框圖, 典型應用電路圖和MAX16929評估板主要特性,電路圖和材料清單. The MAX16929 is a highly integrated power supply for automotive TFT-LCD applications. The device integrates one buck converter, one boost converter, one 1.8V/3.3V regulator controller, and two gate voltage regulators. The device comes in several versions to satisfy com mon automotive power-supply requirements. Designed to operate from a single 4V to 28V supply or 5.5V to 28V supply, the device is ideal for automotive TFT-LCD applications. Both the buck and boost converters use spread-spec trum modulation to reduce peak interference and to opti mize 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 MAX16929 is available in a 28-pin TSSOP pack age with exposed pad, and operates over the -40NC to +105NC temperature range. MAX16929主要特性: Operating Voltage Range of 4V to 28V (Buck) or 3V to 5.5V (Boost) Independent 28V Input Buck Converter Powers TFT Bias Supply Circuitry and External Circuitry 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 Operation 2.1MHz (Buck Converter) 2.2MHz (Boost Converter) Flexible Stand-Alone Sequencing True Shutdown™ Boost Converter 6μA Low-Current Shutdown Mode (Buck) Internal Soft-Start Overtemperature Shutdown -40NC to +105NC Operation MAX16929應用: Automotive Dashboards Automotive Central Information Displays Automotive Navigation Systems 
圖1.MAX16929升壓轉換器功能框圖
圖2.MAX16929典型應用電路圖 MAX16929評估板 The MAX16929 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 one step-down and one step-up switching regulator, one positive gate and one negative gate volt age regulator, one 3.3V regulator controller with external npn transistor, and one positive and one negative charge pump. The EV kit can operate from 4.5V to 28V input voltages and is optimized for automotive TFT-LCD applications. The step-down switching regulator is configured for a 5V output that provides at least 1.2A. The step-up switching regulator is configured for a 12V output that provides at least 500mA. The positive gate voltage regulator pro vides 18V output and the negative gate voltage regulator provides -6.2V. MAX16929評估板主要特性: 4.5V to 28V Input Range Output Voltages 5V Output at 1.2A (Step-Down Switching Regulator) 12V Output at 500mA (Step-Up Switching Regulator) 3.3V Output at 500mA (Regulator Controller) 18V Output (Positive Gate Voltage Regulator) -6.2V Output (Negative Gate Voltage Regulator) High-Frequency Operation 2.1MHz (Buck Converter) 2.2MHz (Boost Converter) Adjustable Positive and Negative Charge Pumps Proven PCB Layout Fully Assembled and Tested
圖3. MAX16929評估板電路圖 MAX16929評估板材料清單:
圖4.MAX16929評估板PCB布局圖 詳情請見: http://datasheets.maxim-ic.com/en/ds/MAX16929.pdf 和 http://datasheets.maxim-ic.com/en/ds/MAX16929EVKIT.pdf |
