MAX749数字调节LCD偏置电源

可提供> -100V的驱动

状态

状况：生产中。

概述

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The MAX749 generates negative LCD-bias contrast voltages from 2V to 6V inputs. Full-scale output voltage can be scaled to -100V or greater, and is digitally adjustable in 64 equal steps by an internal digital-to-analog converter (DAC). Only seven small surface-mount components are required to build a complete supply. The output voltage can also be adjusted using a PWM signal or a potentiometer.

A unique current-limited control scheme reduces supply current and maximizes efficiency, while a high switching frequency (up to 500kHz) minimizes the size of external components. Quiescent current is only 60µA max and is reduced to under 15µA in shutdown mode. While shut down, the MAX749 retains the voltage set point, simplifying software control. The MAX749 drives either an external P-channel MOSFET or a PNP transistor.

现备有评估板： MAX749EVKIT

关键特性		应用/使用
+2.0V to +6.0V Input Voltage Range Flexible Control of Output Voltage: Digital Control Potentiometer Adjustment PWM Control Output Voltage Range Set by One Resistor Low, 60µA Max Quiescent Current 15µA Max Shutdown Mode Small Size - 8-Pin SO and Plastic DIP Packages		通信系统笔记本电脑笔记本电脑掌上电脑 PDA及其它手持设备便携式数据收集终端