Maxim公司的MAX16928是高度集成的汽车TFT-LCD显示器电源,器件集成了一个升压转换器(高达6W,输出高达18V),一个1.8V/3.3V稳压控制器(500mA电流)和两个栅极电压稳压器,其中的正栅极电压稳压器能在28V时提供20mA电流,高频2.2MHz工作,提供软起动和超温关断等功能.主要用在汽车仪表盘,汽车中心信息显示器和汽车导航系统.本文介绍了MAX16928主要特性,方框图, 正输出和负输出电压的多级电荷泵电路以及典型应用电路.
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 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:
Automotive Dashboards
Automotive Central Information Displays
Automotive Navigation Systems
图1.MAX16928升压转换器功能框图
图2.正输出电压的多级电荷泵电路
图3.负输出电压的多级电荷泵电路
图4.MAX16928应用电路图