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(gè)降壓轉(zhuǎn)換器,一個(gè)升壓轉(zhuǎn)換器,一個(gè)1.8V/3.3V穩(wěn)壓控制器和兩個(gè)柵極電壓穩(wěn)壓器.工作電壓4V-28V(降壓)或3V-5.5V(升壓),高達(dá)6W的升壓輸出達(dá)18V,高頻開關(guān)工作:?2.1MHz (降壓轉(zhuǎn)換器),2.2MHz (升壓轉(zhuǎn)換器),主要用在汽車儀表盤,汽車導(dǎo)航系統(tǒng)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(yīng)用電路圖和MAX16929評(píng)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 common 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-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 MAX16929 is available in a 28-pin TSSOP package 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(yīng)用:
Automotive Dashboards
Automotive Central Information Displays
Automotive Navigation Systems
圖1.MAX16929升壓轉(zhuǎn)換器功能框圖
圖2.MAX16929典型應(yīng)用電路圖
MAX16929評(píng)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 voltage 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 provides 18V output and the negative gate voltage regulator provides -6.2V.
MAX16929評(píng)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(píng)估板電路圖
MAX16929評(píng)估板材料清單:
圖4.MAX16929評(píng)估板PCB布局圖
詳情請(qǐng)見(jiàn):
http://datasheets.maxim-ic.com/en/ds/MAX16929.pdf
和
http://datasheets.maxim-ic.com/en/ds/MAX16929EVKIT.pdf
