MAX685是Maxim美信半导体公司的一款DC-DC开关调节器产品，MAX685是双输出(正-负)、DC-DC转换器，用于CCD及LCD，本站介绍了MAX685的封装应用图解、特点和优点、功能等，并给出了与MAX685相关的Maxim元器件型号供参考。
MAX685 - 双输出(正-负)、DC-DC转换器，用于CCD及LCD - DC-DC开关调节器 - Maxim美信半导体高性能芯片品质 - 美信半导体
The MAX685 DC-DC converter provides low-noise dual outputs for powering CCD imaging devices and LCDs. This device uses a single inductor to provide independently regulated positive and negative outputs. Integrated power switches are included in a small 24-Pin 4mm x 4mm Thin QFN package to save space and reduce cost. A 16-pin QSOP package is also available.
Each output delivers up to 10mA from a +2.7V to +5.5V input voltage range. Output voltages are set independently up to 24V and down to -9V. With a few additional low-cost components, the output voltages can be set at up to 45V and down to -16V. Output ripple magnitude is 30mVp-p. The MAX685 uses a fixed-frequency, pulse-width-modulated (PWM) control scheme at 220kHz or 400kHz to permit output noise filtering and to reduce the size of external components. The frequency can also be synchronized to an external clock signal between 200kHz and 480kHz.
The MAX685 has a power-OK indicator output (POK) that signals when both outputs are within regulation. A logic-controlled shutdown completely turns off both outputs and reduces supply current to 0.1µA. The user can also set which output turns on first.
The preassembled MAX685 evaluation kit is available to reduce design time.
