【选型】可替换MPS MP1593的国产降压DCDC PL8332G助力机顶盒，输入电压高达36V

时间： 2020-10-03 来源：宝砾微

技术问答

在机顶盒电源部分设计时，外部适配器输出DC12V，需要降压DCDC转为5V为后级供电。之前不少厂家会选择MPS的MP1593，但随着国产化低成本压力越来越大，急需一颗高性价比替换料。本文推荐国产宝砾微降压DCDC PL8332G可完美替换MP1593。两者参数对比见图1：

图1：PL8332G与MP1593电性能参数对比

通过上述参数对比可知：

1、在输入电压方面，相比MP1593，PL8332G有更高的耐压6.5~36V，能为24V供电系统提供充足电压余量；

2、在输出电流、工作频率和效率方面，两者表现基本一致，并且保护功能也都相同，可在设计时直接替换MP1593；

3、PL8332G采用同步降压，相比MP1593外围能省一颗二极管；

4、另外，两者的工作温度都符合工业级设计要求，Tj为-40~125℃，有效保证芯片可靠性。

宝砾微PL8332G封装为ESOP-8，MP1593封装为SOIC8E，通过查阅两者数据手册可知，两个封装尺寸大小完全相同，并且Pin脚定义也都匹配，可以P2P替换。在外围电路方面，相比MP1593，PL83332G为同步降压DCDC，，外围能省个二极管，降低BOM成本。封装对比和典型应用电路对比见图2、图3：

图2：PL8332G与MP1593封装pin脚定义对比

图3： PL8332G与MP1593典型应用电路对比

除以上电性能、封装对比外，宝砾微降压DCDC PL8332G有着更低的价格和供货周期优势。

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