【选型】大电流负电LDO SGM2209，实现TR组件中低成本、国产化替换MC79L05ACH
在TR组件中，常常会用到负电用于给功率放大器栅极供电，由于功率放大器对栅极电压非常敏感，需要经过二次稳压才能给到功率放大器，常用的负电LDO是MC79L05ACH。由于国产化及供应方面的需求，本文推荐圣邦微电子的大电流负电LDO：SGM2209-5.0XN5G/TR，实现功能优化替换，同时兼具降本与国产化。
如下图是SGM2209-5.0XN5G/TR和MC79L05ACH主要参数对比。
在TR组件中，功率放大器是最核心的器件，其对栅极电压非常敏感，要求栅极供电要求电压精度高，可靠性高，适用性强，PSSR高， SGM2209-5.0XN5G/TR在实测指标上要优于MC79L05ACH，又有国产化、低成本的特点。应用对比分析如下：
1、输入电压：SGM2209-5.0XN5G/TR具有更高的输入电压范围，能够-2.7~24V的电压范围内，保证输出电压稳定在-5V，而MC79L05ACH在-2.7~-7V和-20~-24V之间时，可能输出电压严重偏离-5V。
2、电压精度：SGM2209-5.0XN5G/TR的输出电压精度±1%，可以保证不同产品的功放性能一致，而MC79L05ACH电压精度只有±0.2V，不同功放表现的性能结果可能差距比较大，不能保证产品一致性。
3、输出电流：虽然SGM2209-5.0XN5G/TR的带载能力要更高，但在TR组件的功放栅极应用，需要的电流能力非常小，不到20mA，二者都可以满足。
综上，SGM2209-5.0XN5G/TR的性能优势比较明显，提高的输入电压范围和输出电压精度，可以保证TR组件具有更高的可靠性和批次一致性，对产品质量的提升非常明显。实现低成本、国产化的同时，还能大幅度提升产品质量。
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现货市场
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