【选型】国产DCDC降压芯片SGM61020可PTP兼容RT8097C，助力100G光模块电源设计
随着光通讯市场发展，用户对光通讯速率要求越来越高，100G光模块里面需要使用一颗降压DCDC将3.3V降到1.8V给CDR供电，国外常用品牌为TI\MPS等知名品牌，国内也做了很多可以P2P替代的器件，本文介绍一款交期、性能较好的圣邦微（SGMICRO）DCDC降压芯片SGM61020可P2P兼容立琦RT8097C。
SGM61020在光模块内部应用电路如下图1所示：
SGM61020和RT8097C的性能参数如下图1所示：
通过对比两者的参数发现：
1、 SGM61020和RT8097C的工作温度都是-40℃至125℃，均可以满足产品对于工作温度的要求。
2、 SGM61020和RT8097C都是同步降压型DC-DC，SGM61020的输出电压最小值略低于RT8097C，但具有相同的最小电压输出值、电流输出能力，其静态电流高于 RT8097C，关断电流小于RT8097C，所以各有优劣之处。
3、 两者的最高的效率值都可以达到95%，封装一样，并且小封装产品很适合光模块设计。
4、 SGM61020和RT8097C封装Pin脚完全P2P兼容，大大缩短测试验证周期，两者封装PIN脚对比见图2。
由以上分析可知，在光模块项目上，国产供应商圣邦微的SGM61020可以PIN-TO-PIN兼容RT8097C，适合研发人员进行光模块电路设计，便于以后的产品生产。世强作为圣邦微的优秀代理商可以提供及时的技术服务与稳定的供货支持。
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