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MAX686：DAC控制、boost反相型LCD偏置电源，内置开关

The MAX686 DAC-controlled boost/inverter IC converts a positive input voltage to a positive or negative LCD bias voltage up to +27.5V or -27.5V. The device features an internal N-channel MOSFET switch, programmable current limiting, and an internal 6-bit digital-to-analog converter (DAC) for digital adjustment of the output voltage. It comes in a small 16-pin QSOP package (same size as an 8-pin SO). The MAX686 uses a current-limited, pulse-frequency-modulation (PFM) control scheme to provide high efficiency over a wide range of load conditions. Its high switching frequency (up to 300kHz) allows the use of small external components. An LCDON output allows the LCD bias voltage to be automatically disabled when the display logic voltage is removed, protecting the display. The MAX686 has a +2.7V to +5.5V input voltage range for the IC, and a +0.8V to +27.5V input voltage range for the inductor. Typical quiescent supply current is 65µA. Shutdown current is 1.5µA. The MAX686 offers high-level integration to save space, reduce power consumption, and increase battery life, making it an excellent choice for battery-powered portable equipment. The MAX629 is similar to the MAX686, except that it does not contain a built-in DAC. Both devices have evaluation kits to facilitate designs.

关键特性 Internal 500mA, 28V N-Channel Switch (no external FET required) Adjustable Output Voltage to +27.5V or -27.5V 6-Bit DAC-Controlled Output Voltage Up to 90% Efficiency Small 16-Pin QSOP Package (Same size as 8-pin SO) Power-OK Indicator 65µA Quiescent Current 1.5µA Shutdown Current Up to 300kHz Switching Frequency

MAX686：典型工作电路 应用 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 LCD正或负偏置 变容调谐二极管偏置

数据手册DataSheet

关键参数

开发工具

• MAX686EVKIT

质量和环境数据

• MAX686.pdf

相关产品

• MAX629：28V、低功耗、高压、boost或反相DC-DC转换器

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