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Maxim公司的MAX16928是高度集成的汽車TFT-LCD顯示器電源,器件集成了一個升壓轉(zhuǎn)換器(高達6W,輸出高達18V),一個1.8V/3.3V穩(wěn)壓控制器(500mA電流)和兩個柵極電壓穩(wěn)壓器,其中的正柵極電壓穩(wěn)壓器能在28V時提供20mA電流,高頻2.2MHz工作,提供軟起動和超溫關斷等功能.主要用在汽車儀表盤,汽車中心信息顯示器和汽車導航系統(tǒng).本文介紹了MAX16928主要特性,方框圖, 正輸出和負輸出電壓的多級電荷泵電路以及典型應用電路. Automotive TFT-LCD Power Supply with Boost Converter and Gate Voltage Regulators 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: Automotive Dashboards Automotive Central Information Displays Automotive Navigation Systems 
圖1.MAX16928升壓轉(zhuǎn)換器功能框圖
圖2.正輸出電壓的多級電荷泵電路
圖3.負輸出電壓的多級電荷泵電路
圖4.MAX16928應用電路圖 詳情請見: http://datasheets.maxim-ic.com/en/ds/MAX16928.pdf |
