【应用】可输出负压的国产BUCK-BOOST电源芯片SGM660助力400G光模块，满足小型化需求

时间： 2021-04-14 来源：世强

技术问答

长距离传输的400G光模块多路EML，所以会需要用大电流的负压芯片给EA供电。目前常规的方案是用多个小封装的Charge pump给每路EA提供负压，但比较占用空间。另一种方案是大电流、可输出负压的电源芯片外加多通道运放来给多路EA提供负压，此方案比较节省空间，且需要的元器件也较少，本文更加推荐此方案。对电源芯片的选择，本文推荐圣邦微电子旗下可输出负压的BUCK-BOOST电源芯片 SGM660。

图1：SGM660的封装及典型应用电路图

目前400G光模块的PCB空间非常紧张，器件选型时优先考虑封装能否放下。如图1所示，SGM660的封装为WLCSP-0.85*1.25，是小型化封装，且SGM660的外围器件很少，只有一个电感和两个电容，电路也较简单，这些特点能很大程度地节省PCB空间，方便PCB设计。

SGM660输入电压2.8V~5.5V，输出电压从-0.8V~-5.2V，输出电压可用通过软件控制，这样能更好的匹配光器件。400G光模块会用到8路或4路EML，单路EML电流一般20~30mA，而SGM660的开关限流点有450mA和620mA两档可选，其输出电流能力完全能满足400G光模块的应用。且SGM660多个开关频率可选，客户可根据设计实际需求进行选择，应用比较灵活。

综上所示，可输出负压的BUCK-BOOST电源芯片SGM660，具有小封装，大电流，输出电压可调等特点，非常适合400G光模块的应用。

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比较全面的展示了圣邦微在光模块中应用的相关产品，总的来说目前是有20--30个光模块相关产品。主要涵盖了TEC＼APD＼EML驱动这样的专用器件，高性能运放、电源相关LDO＼DCDC、负压，负载开关以及温度传感器等产品。

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