{"id":28243,"date":"2025-10-10T09:02:21","date_gmt":"2025-10-10T01:02:21","guid":{"rendered":"https:\/\/techclass.wfjydl.com\/?p=28243"},"modified":"2025-11-13T17:27:36","modified_gmt":"2025-11-13T09:27:36","slug":"ldo%e5%9f%ba%e7%a1%80%e7%9f%a5%e8%af%86","status":"publish","type":"post","link":"https:\/\/techclass.wfjydl.com\/knowledge\/dcdc\/s-dcdc\/24579","title":{"rendered":"LDO\u57fa\u7840\u77e5\u8bc6"},"content":{"rendered":"<p>\u4f4e\u538b\u5dee\u7ebf\u6027\u7a33\u538b\u5668\uff08\u4ee5\u4e0b\u7b80\u79f0LDO\uff09\u662f\u4e00\u79cd\u534a\u5bfc\u4f53\u5668\u4ef6\uff0c\u662f\u5728\u8f93\u5165\u4e0e\u8f93\u51fa\u7684\u7535\u538b\u5dee\u8f83\u5c0f\u7684\u72b6\u6001\u4e0b\u4e5f\u80fd\u5de5\u4f5c\u7684\u7ebf\u6027\u7a33\u538b\u5668\u7684\u7edf\u79f0\u3002LDO\u7684\u7279\u70b9\u662f\u5373\u4f7f\u8f93\u5165\u4e0e\u8f93\u51fa\u7535\u538b\u5dee\u5f88\u5c0f\u4ecd\u80fd\u83b7\u5f97\u7a33\u5b9a\u7684\u8f93\u51fa\uff0c\u56e0\u6b64\u88ab\u5e7f\u6cdb\u5e94\u7528\u4e8e\u7535\u6c60\u9a71\u52a8\u7684\u79fb\u52a8\u8bbe\u5907\u4ee5\u53ca\u6ce8\u91cd\u4f4e\u529f\u8017\u548c\u5c0f\u578b\u5316\u7684\u5e94\u7528\u573a\u666f\u4e2d\u3002\u5177\u4f53\u800c\u8a00\uff0c\u5728\u76f4\u63a5\u7531\u9502\u79bb\u5b50\u7535\u6c60\u9a71\u52a8\u7535\u8def\u65f6\u91c7\u7528LDO\u5c31\u662f\u4e00\u4e2a\u5178\u578b\u7684\u6848\u4f8b\u3002<\/p>\n<p>\u672c\u6587\u6211\u4eec\u5c06\u4ecb\u7ecdLDO\u7684\u5de5\u4f5c\u539f\u7406\u4e0e\u7535\u8def\u7ed3\u6784\u3001\u8bbe\u8ba1\u65f6\u5e94\u8003\u8651\u7684\u89c4\u8303\u548c\u7279\u6027\u7b49\u5185\u5bb9\uff0c\u540c\u65f6\u68b3\u7406\u5728\u5f15\u5165LDO\u65f6\u9700\u8981\u638c\u63e1\u7684\u8981\u70b9\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/techclass.wfjydl.com\/wp-content\/uploads\/2025\/10\/01_low_dropout_what_is_an_ldo.png\" alt=\"Low Dropout What is an LDO?\" width=\"700\" height=\"394\" \/><\/p>\n<h2 id=\"toc1\">\u4ec0\u4e48\u662fLDO\uff1f\uff08\u5b9a\u4e49\u548c\u57fa\u672c\u539f\u7406\uff09<\/h2>\n<p>LDO\u662f\u4e00\u79cd\u5373\u4f7f\u5728\u8f93\u5165\u7535\u538b\u4e0e\u8f93\u51fa\u7535\u538b\u4e4b\u5dee\uff08\u8f93\u5165\u8f93\u51fa\u7535\u538b\u5dee\uff09\u8f83\u5c0f\u7684\u60c5\u51b5\u4e0b\uff0c\u4ecd\u80fd\u7ef4\u6301\u4e00\u5b9a\u8f93\u51fa\u7684\u7ebf\u6027\u7a33\u538b\u5668\u3002\u4e0e\u666e\u901a\u7684\u4e09\u7aef\u7a33\u538b\u5668\u76f8\u6bd4\uff0c\u5176\u663e\u8457\u7279\u70b9\u5728\u4e8e\u6240\u9700\u8f93\u5165\u7535\u538b\u7684\u88d5\u91cf\u66f4\u5c0f\u3002\u672c\u8282\u6211\u4eec\u5c06\u7b80\u8981\u56de\u987eLDO\u7684\u5b9a\u4e49\u548c\u5386\u53f2\u80cc\u666f\uff0c\u5e76\u4ecb\u7ecd\u5176\u88ab\u4f17\u591a\u8bbe\u5907\u5e7f\u6cdb\u91c7\u7528\u7684\u539f\u56e0\u3002<\/p>\n<h3 id=\"toc2\">LDO\u7684\u542b\u4e49\u4e0e\u7531\u6765\uff08\u201cLow Dropout\u201d\u7684\u8bcd\u6e90\u4e0e\u5b9a\u4e49\uff09<\/h3>\n<p>LDO\u662f\u201cLow Dropout Regulator\u201d\u7684\u82f1\u6587\u9996\u5b57\u6bcd\u7f29\u5199\uff0c\u8868\u793a\u5176\u5177\u6709\u4f4e\u538b\u5dee\u3002\u538b\u5dee\u662f\u6307\u201c\u7ef4\u6301\u7a33\u5b9a\u7684\u7a33\u538b\u6240\u9700\u7684\u6700\u5c0f\u8f93\u5165\u7535\u538b\u4e0e\u8f93\u51fa\u7535\u538b\u4e4b\u5dee\u201d\u3002\u4e00\u822c\u7684\u4f20\u7edf\u7ebf\u6027\u7a33\u538b\u5668\u901a\u5e38\u9700\u8981\u6bd4\u8f93\u51fa\u7535\u538b\u9ad8\u6570V\u7684\u8f93\u5165\u7535\u538b\uff0c\u800cLDO\u53ef\u5c06\u8fd9\u4e00\u5dee\u503c\u63a7\u5236\u5728\u6570\u767emV\uff0c\u6709\u4e9b\u4ea7\u54c1\u751a\u81f3\u53ef\u81f3\u6570\u5341mV\u3002\u5927\u591a\u6570LDO\u5185\u90e8\u5305\u542b\u901a\u8def\u5143\u4ef6\uff08\u53cc\u6781\u6676\u4f53\u7ba1\u6216MOSFET\uff09\u3001\u8bef\u5dee\u653e\u5927\u5668\u53ca\u4fdd\u62a4\u7535\u8def\uff0c\u80fd\u5426\u6ee1\u8db3\u5404\u9879\u89c4\u683c\uff08\u8f93\u5165\u7535\u538b\u8303\u56f4\u3001\u8f93\u51fa\u7535\u6d41\u8303\u56f4\u7b49\uff09\u662f\u9009\u578b\u65f6\u7684\u5173\u952e\u8003\u91cf\u56e0\u7d20\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u5728\u9700\u89813.3V\u7684\u8f93\u51fa\u800c\u8f93\u5165\u4ec5\u4e3a4.0V\u5de6\u53f3\u7684\u6761\u4ef6\u4e0b\uff0cLDO\u4ecd\u6709\u53ef\u80fd\u7a33\u5b9a\u5de5\u4f5c\u3002\u8fd9\u79cd\u201c\u4f4e\u538b\u5dee\u201d\u6709\u52a9\u4e8e\u63d0\u9ad8\u7535\u6e90\u6548\u7387\u5e76\u51cf\u5c11\u70ed\u635f\u8017\uff0c\u56e0\u6b64\u5728\u8ffd\u6c42\u8282\u80fd\u4e0e\u5c0f\u578b\u5316\u7684\u8bbe\u5907\u4e2d\u53d1\u6325\u7740\u91cd\u8981\u4f5c\u7528\u3002<\/p>\n<h3 id=\"toc3\">\u4e0e\u4f20\u7edf\u7ebf\u6027\u7a33\u538b\u5668\u7684\u533a\u522b<\/h3>\n<p>\u7ebf\u6027\u7a33\u538b\u5668\u901a\u8fc7\u5185\u90e8\u7684\u901a\u8def\u5143\u4ef6\uff08\u6676\u4f53\u7ba1\u7b49\uff09\u5c06\u8f93\u5165\u7535\u538b\u4e2d\u591a\u4f59\u7684\u7535\u538b\u4ee5\u70ed\u7684\u5f62\u5f0f\u8017\u6563\u6389\uff0c\u4ece\u800c\u5b9e\u73b0\u7a33\u5b9a\u8f93\u51fa\u3002\u4f20\u7edf\u7ebf\u6027\u7a33\u538b\u5668\u5728\u8f93\u5165\u4e0e\u8f93\u51fa\u7535\u538b\u5dee\u8f83\u5927\u65f6\u8f83\u6613\u4e8e\u8bbe\u8ba1\uff0c\u4f46\u5f53\u8f93\u5165\u8f93\u51fa\u7535\u538b\u5dee\u53d8\u5c0f\u65f6\uff0c\u5219\u96be\u4ee5\u6b63\u5e38\u5de5\u4f5c\u3002<\/p>\n<p>\u76f8\u6bd4\u4e4b\u4e0b\uff0cLDO\u901a\u8fc7\u91c7\u7528\u5728\u7ebf\u6027\uff08\u7535\u963b\uff09\u533a\u57df\u6613\u4e8e\u4fdd\u6301\u4f4e\u5bfc\u901a\u7535\u963b\u7684\u6676\u4f53\u7ba1\u7b49\u65b9\u5f0f\uff0c\u4f7f\u5176\u5373\u4f7f\u5728\u8f93\u5165\u8f93\u51fa\u7535\u538b\u5dee\u5f88\u5c0f\u65f6\u4e5f\u80fd\u5de5\u4f5c\u3002\u5177\u4f53\u800c\u8a00\uff0c\u901a\u8fc7\u5c06\u53cc\u6781\u6676\u4f53\u7ba1\u6216MOSFET\u4ee5\u6e90\u6781\u8ddf\u968f\u5668\u6216\u5c04\u6781\u8ddf\u968f\u5668\u7b49\u7ed3\u6784\u5de5\u4f5c\uff0c\u53ef\u4ee5\u5c06\u538b\u5dee\u7535\u538b\u63a7\u5236\u5728\u6570\u767emV\u4ee5\u4e0b\u3002<\/p>\n<p>\u8bb8\u591a\u4f20\u7edf\u7ebf\u6027\u7a33\u538b\u5668\u8981\u6c42\u8f93\u5165\u7535\u538b\u6bd4\u8f93\u51fa\u7535\u538b\u9ad82V\u4ee5\u4e0a\uff0c\u5176\u8bbe\u8ba1\u662f\u4ee5\uff08\u8f93\u5165\u7535\u538b \u2212 \u8f93\u51fa\u7535\u538b\uff09\u8f83\u5927\u7684\u60c5\u51b5\u4e3a\u524d\u63d0\u7684\u3002\u800cLDO\u5373\u4f7f\u5728\u7535\u6c60\u9a71\u52a8\u7b49\u8f93\u5165\u7535\u538b\u4e0b\u964d\u7684\u5e94\u7528\u4e2d\uff0c\u4ecd\u6613\u4e8e\u4fdd\u6301\u989d\u5b9a\u8f93\u51fa\u76f4\u81f3\u6781\u9650\u72b6\u6001\uff0c\u56e0\u800c\u5728\u8282\u80fd\u4e0e\u4f4e\u53d1\u70ed\u7b49\u65b9\u9762\u5177\u6709\u4f18\u52bf\u3002<\/p>\n<h3 id=\"toc4\">LDO\u5907\u53d7\u5173\u6ce8\u7684\u7406\u7531\uff08\u4f4e\u538b\u5dee\u3001\u4f4e\u529f\u8017\u3001\u5c0f\u578b\u5316\u7b49\uff09<\/h3>\n<p>LDO\u53d7\u5230\u5173\u6ce8\u7684\u539f\u56e0\u4e3b\u8981\u6709\u4ee5\u4e0b\u51e0\u70b9\uff1a<\/p>\n<ul class=\"def-list def-list--dot\">\n<li><strong>\u4f4e\u529f\u8017<\/strong>\uff1a\u538b\u5dee\u7535\u538b\u8d8a\u4f4e\uff0c\u6d6a\u8d39\u7684\u529f\u8017\u5c31\u8d8a\u5c11\u3002<\/li>\n<li><strong>\u70ed\u8bbe\u8ba1\u7b80\u5316<\/strong>\uff1a\u901a\u8fc7\u6291\u5236\u8f93\u5165\u8f93\u51fa\u7535\u538b\u5dee\uff0c\u53ef\u51cf\u5c11\u4ea7\u751f\u7684\u70ed\u91cf\uff0c\u6709\u65f6\u4f7f\u7528\u5c0f\u578b\u6563\u70ed\u7247\u5373\u53ef\u3002<\/li>\n<li><strong>\u5c0f\u578b\u5316\u4e0e\u7535\u6c60\u5de5\u4f5c<\/strong>\uff1a\u5728\u79fb\u52a8\u8bbe\u5907\u7b49\u5e94\u7528\u4e2d\uff0c\u5373\u4f7f\u7535\u6c60\u7684\u7535\u538b\u4e0b\u964d\uff0c\u4ecd\u6613\u4e8e\u7ef4\u6301\u5de5\u4f5c\u3002<\/li>\n<li><strong>\u566a\u58f0\u65b9\u9762<\/strong>\uff1a\u4e0e\u5f00\u5173\u7a33\u538b\u5668\u76f8\u6bd4\uff0c\u4e0d\u6613\u4ea7\u751f\u9ad8\u9891\u566a\u58f0\u3002<\/li>\n<\/ul>\n<p>\u56e0\u6b64\uff0cLDO\u88ab\u5e7f\u6cdb\u5e94\u7528\u4e8e\u4ece\u7535\u6c60\u9a71\u52a8\u5e94\u7528\u5230\u901a\u4fe1\u8bbe\u5907\u4ee5\u53ca\u5de5\u4e1a\u8bbe\u5907\u7b49\u8bf8\u591a\u9886\u57df\u3002\u672c\u8282\u4e3b\u8981\u603b\u7ed3\u4e86\u6982\u5ff5\u6027\u7684\u7406\u89e3\uff0c\u540e\u7eed\u7ae0\u8282\u5c06\u8fdb\u4e00\u6b65\u8be6\u7ec6\u4ecb\u7ecd\u5176\u7535\u8def\u7ed3\u6784\u548c\u5de5\u4f5c\u539f\u7406\u3002<\/p>\n<h2 id=\"toc5\">LDO\u7684\u7535\u8def\u7ed3\u6784\u548c\u5de5\u4f5c\u539f\u7406<\/h2>\n<p>LDO\u5728\u901a\u8fc7\u53cd\u9988\u63a7\u5236\u6765\u4fdd\u6301\u8f93\u51fa\u7535\u538b\u7a33\u5b9a\u65b9\u9762\uff0c\u4e0e\u666e\u901a\u7684\u7ebf\u6027\u7a33\u538b\u5668\u76f8\u540c\u3002\u7136\u800c\uff0c\u4e3a\u4e86\u5c06\u8f93\u5165\u8f93\u51fa\u7535\u538b\u5dee\u63a7\u5236\u5f97\u8f83\u5c0f\uff0c\u5728\u5176\u5185\u90e8\u7ed3\u6784\u3001\u6240\u7528\u6676\u4f53\u7ba1\u7c7b\u578b\u53ca\u4fdd\u62a4\u529f\u80fd\u7b49\u65b9\u9762\u5747\u91c7\u53d6\u4e86\u7279\u6b8a\u8bbe\u8ba1\u3002\u672c\u8282\u5c06\u4ecb\u7ecdLDO\u7684\u4e3b\u8981\u7535\u8def\u6a21\u5757\uff0c\u5e76\u9610\u8ff0\u5176\u80fd\u591f\u5b9e\u73b0\u4f4e\u538b\u5dee\u7684\u539f\u7406\u3002<\/p>\n<h3 id=\"toc6\">\u4e3b\u8981\u6a21\u5757\uff08\u901a\u8def\u5143\u4ef6\u3001\u8bef\u5dee\u653e\u5927\u5668\u3001\u4fdd\u62a4\u529f\u80fd\uff09\u6982\u8ff0<\/h3>\n<p>LDO\u7684\u7ed3\u6784\u672c\u8eab\u76f8\u5bf9\u7b80\u5355\u3002\u901a\u8fc7\u7ec4\u5408\u4ee5\u4e0b\u4e3b\u8981\u6a21\u5757\u6765\u7ef4\u6301\u6052\u5b9a\u7684\u8f93\u51fa\u7535\u538b\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/techclass.wfjydl.com\/wp-content\/uploads\/2025\/10\/02_main_building_blocks.png\" alt=\"\u4e3b\u8981\u6a21\u5757\u6982\u8ff0\" width=\"700\" height=\"394\" \/><\/p>\n<ul class=\"def-list def-list--dot\">\n<li><strong>\u901a\u8def\u5143\u4ef6\uff08Pass Element\uff09<\/strong><br \/>\n\u4f7f\u7528\u53cc\u6781\u6676\u4f53\u7ba1\u6216MOSFET\u6765\u63a7\u5236\u4ece\u8f93\u5165\u5230\u8f93\u51fa\u7684\u7535\u6d41\u3002\u8fd1\u5e74\u6765\uff0c\u4e5f\u6709\u5f88\u591aLDO\u901a\u8fc7\u5185\u7f6e\u7535\u8377\u6cf5\u6216\u63a7\u5236\u7535\u8def\u7b49\u7279\u6b8a\u8bbe\u8ba1\uff0c\u4f7f\u5176\u5373\u4f7f\u5728\u8f83\u4f4e\u7684\u6805\u6e90\u7535\u538b\u4e0b\u4e5f\u80fd\u9a71\u52a8\u3002<\/li>\n<li><strong>\u8bef\u5dee\u653e\u5927\u5668\uff08Error Amplifier\uff09<\/strong><br \/>\n\u76d1\u6d4b\u8f93\u51fa\u5e76\u4e0e\u53c2\u8003\u7535\u538b\u8fdb\u884c\u6bd4\u8f83\uff0c\u4ece\u800c\u63a7\u5236\u901a\u8def\u5143\u4ef6\u3002\u5176\u589e\u76ca\u7279\u6027\u4e0e\u54cd\u5e94\u901f\u5ea6\u5bf9\u7cbe\u5ea6\u548c\u77ac\u6001\u54cd\u5e94\u6709\u5f88\u5927\u5f71\u54cd\u3002<\/li>\n<li><strong>\u4fdd\u62a4\u529f\u80fd<\/strong><br \/>\n\u5185\u7f6e\u8fc7\u6d41\u4fdd\u62a4\u3001\u8fc7\u70ed\u4fdd\u62a4\u53ca\u53cd\u5411\u7535\u6d41\u4fdd\u62a4\u7b49\u529f\u80fd\uff0c\u786e\u4fddLDO\u81ea\u8eab\u7684\u5b89\u5168\u6027\u548c\u5bf9\u8d1f\u8f7d\u7aef\u7684\u4fdd\u62a4\u3002<\/li>\n<\/ul>\n<h3 id=\"toc7\">\u538b\u5dee\u7535\u538b\u7684\u539f\u7406<\/h3>\n<p>LDO\u7279\u70b9\u2014\u2014\u538b\u5dee\u7535\u538b\u7684\u5b9a\u4e49\u4e3a\uff1a\u901a\u8def\u5143\u4ef6\u5728\u63d0\u4f9b\u7535\u6d41\u7684\u540c\u65f6\u80fd\u4fdd\u6301\u6b63\u5e38\u63a7\u5236\u7684\u6700\u5c0f\u8f93\u5165\u8f93\u51fa\u7535\u538b\u5dee\u3002\u4f8b\u5982\uff0c\u5bf9\u4e8e\u4f7f\u7528PNP\u6676\u4f53\u7ba1\u7684LDO\uff0c\u5176\u53d1\u5c04\u6781-\u96c6\u7535\u6781\u95f4\u7535\u538b\u4e0e\u57fa\u6781-\u53d1\u5c04\u6781\u95f4\u7535\u538b\u5728\u4e34\u8fd1\u9971\u548c\u72b6\u6001\u5de5\u4f5c\u65f6\u7684\u603b\u548c\u4f1a\u51b3\u5b9a\u538b\u5dee\u7535\u538b\u3002\u5176\u7b80\u5355\u7684\u6a21\u578b\u516c\u5f0f\u5982\u4e0b\u6240\u793a\u3002<\/p>\n<p><!-- \u6570\u5f0f --><\/p>\n<p><span class=\"mathjax-text\">\\(V_{dropout}\u2248V_{CE(sat)}+V_{overhead}\\)<\/span><\/p>\n<ul class=\"def-list def-list--dot\">\n<li>\\(V_{CE(sat}\\)\uff1a\u9971\u548c\u533a\u7684\u96c6\u7535\u6781-\u53d1\u5c04\u6781\u95f4\u7684\u7535\u538b<\/li>\n<li>\\(V_{overhead}\\) (control margin)\uff1a\u8bef\u5dee\u653e\u5927\u5668\u4e3a\u907f\u514d\u901a\u8def\u5143\u4ef6\u9971\u548c\u800c\u786e\u4fdd\u7684\u88d5\u91cf\u7535\u538b\uff08\u7528\u4e8e\u5438\u6536\u6e29\u5ea6\u3001\u5de5\u827a\u504f\u5dee\u4ee5\u53ca\u73af\u8def\u589e\u76ca\u4e0b\u964d\u7684\u6570\u5341mV\u7ea7\u522b\uff09<\/li>\n<\/ul>\n<p>\u53e6\u4e00\u65b9\u9762\uff0c\u57fa\u4e8eMOSFET\u7684LDO\u5219\u901a\u8fc7\u5728\u5185\u90e8\u5de7\u5999\u5730\u8bbe\u8ba1\u6805\u6781\u63a7\u5236\u7535\u8def\uff0c\u4f7f\u5176\u80fd\u591f\u5728\u4f4e\u538b\u5dee\u533a\u57df\u5185\u9a71\u52a8P\u6c9f\u9053\u6216N\u6c9f\u9053\u7684MOSFET\u3002\u4f8b\u5982\uff0c\u901a\u8fc7\u7535\u8377\u6cf5\u7b49\u5bf9\u6805\u6781\u7535\u538b\u8fdb\u884c\u8865\u507f\uff0c\u4f7f\u5f97\u5373\u4f7f\u4ece\u5916\u90e8\u770b\u5230\u7684\u8f93\u5165\u2014\u8f93\u51fa\u7535\u538b\u5dee\u5728\u6570\u767emV\u4ee5\u4e0b\u4e5f\u80fd\u5de5\u4f5c\u3002\u5f53\u8d1f\u8f7d\u7535\u6d41\u4e3a\\(I_{out}\\)\uff0cMOSFET\u7684\u5bfc\u901a\u7535\u963b\u4e3a\\(R_{DS(on)}\\)\u65f6\uff0c\u53ef\u4ee5\u8868\u793a\u5982\u4e0b\uff08\u6709\u65f6\u8fd8\u9700\u52a0\u4e0a\u63a7\u5236\u7535\u8def\u6240\u9700\u7684\u6700\u4f4e\u7535\u538b\u5dee\u3002\uff09\uff1a<\/p>\n<p><!-- \u6570\u5f0f --><\/p>\n<p><span class=\"mathjax-text\">\\(V_{dropout}=I_{out}\u00d7R_{DS(on)}\\)<\/span><\/p>\n<ul class=\"def-list def-list--dot\">\n<li>\n<div><strong>\u53cc\u6781\u578bLDO\u65f6<\/strong><\/div>\n<ol class=\"def-list def-list--decimal\">\n<li>\u4ece\u4ea7\u54c1\u89c4\u683c\u4e66\u6216\u6676\u4f53\u7ba1\u7279\u6027\u4e2d\u8bfb\u53d6\u9971\u548c\u7535\u538b\\(V_{CE(sat)}\\)\u3002<\/li>\n<li>\u52a0\u4e0a\u504f\u7f6e\u7535\u538b\\(V_{BE}\\)\u548c\u63a7\u5236\u7535\u8def\u7684\u88d5\u91cf\u7535\u538b\uff0c\u4f30\u7b97\u538b\u5dee\u7535\u538b\u3002<\/li>\n<\/ol>\n<\/li>\n<li>\n<div><strong>MOSFET\u578bLDO\u65f6<\/strong><\/div>\n<ol class=\"def-list def-list--decimal\">\n<li>\u5047\u5b9a\u8d1f\u8f7d\u7535\u6d41\\(I_{out}\\)\u3002<\/li>\n<li>\u786e\u8ba4\\(R_{DS(on)}\\)\uff0c\u5e76\u901a\u8fc7\\(I_{out}\\) \u00d7 \\(R_{DS(on)}\\)\u8ba1\u7b97\u51fa\u6700\u5c0f\u6240\u9700\u538b\u5dee\u3002<\/li>\n<li>\u540c\u65f6\u8003\u8651\u56e0\u6805\u6781\u9a71\u52a8\u7535\u538b\u800c\u4ea7\u751f\u7684\u989d\u5916\u88d5\u91cf\uff0c\u6700\u7ec8\u6c42\u51fa\u538b\u5dee\u7535\u538b\u3002<\/li>\n<\/ol>\n<\/li>\n<\/ul>\n<h3 id=\"toc8\">\u4f4e\u566a\u58f0\u8bbe\u8ba1\u548c\u53cd\u5411\u7535\u6d41\u4fdd\u62a4\u7684\u8981\u70b9<\/h3>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/techclass.wfjydl.com\/wp-content\/uploads\/2025\/10\/03_low_noise_design_and_reverse_current_prevention.png\" alt=\"\u4f4e\u566a\u58f0\u8bbe\u8ba1\u548c\u53cd\u5411\u7535\u6d41\u4fdd\u62a4\u7684\u8981\u70b9\" width=\"700\" height=\"394\" \/><\/p>\n<p>\u4e0e\u5f00\u5173\u7a33\u538b\u5668\u76f8\u6bd4\uff0cLDO\u5177\u6709\u9ad8\u9891\u566a\u58f0\u66f4\u5c11\u7684\u4f18\u70b9\u3002\u4f46\u662f\uff0c\u6839\u636e\u901a\u8def\u5143\u4ef6\u7684\u9009\u62e9\u53ca\u5185\u90e8\u7535\u8def\u7ed3\u6784\u7684\u4e0d\u540c\uff0c\u53cc\u6781\u6676\u4f53\u7ba1\u7684\u57fa\u6781\u7535\u6d41\u8def\u5f84\u6216\u53c2\u8003\u7535\u8def\u7684\u566a\u58f0\u4e5f\u53ef\u80fd\u6210\u4e3a\u95ee\u9898\u3002\u8bbe\u8ba1\u65f6\u9700\u8981\u8003\u8651\u7684\u8981\u70b9\u5982\u4e0b\uff1a<\/p>\n<ul class=\"def-list def-list--dot\">\n<li><strong>\u65c1\u8def\u7535\u5bb9\u5668<\/strong><br \/>\n\u5728\u53c2\u8003\u7535\u8def\u6216\u8bef\u5dee\u653e\u5927\u5668\u7684\u7535\u6e90\u5f15\u811a\u9644\u8fd1\u63a5\u5165\u5c0f\u5bb9\u91cf\u7535\u5bb9\u5668\uff0c\u4ee5\u53bb\u9664\u566a\u58f0\u3002<\/li>\n<li><strong>\u5e03\u5c40\u4f18\u5316<\/strong><br \/>\n\u5408\u7406\u914d\u7f6e\u8f93\u5165\u8f93\u51fa\u7535\u5bb9\u5668\uff0c\u4f18\u5316GND\u5e03\u7ebf\uff0c\u4ee5\u6291\u5236\u5c16\u5cf0\u548c\u7eb9\u6ce2\u3002<\/li>\n<li><strong>\u53cd\u5411\u7535\u6d41\u4fdd\u62a4\uff08Reverse Current Protection\uff09<\/strong><br \/>\n\u82e5\u7535\u6d41\u4ece\u7535\u6c60\u53cd\u5411\u6d41\u5165\u7a33\u538b\u5668\uff0c\u4f1a\u5bfc\u81f4\u8bef\u52a8\u4f5c\u6216\u635f\u574f\u3002\u53ef\u6dfb\u52a0\u4fdd\u62a4\u4e8c\u6781\u7ba1\u6216\u5f00\u5173\u5668\u4ef6\u7b49\u8fdb\u884c\u9632\u62a4\u3002<\/li>\n<\/ul>\n<h2 id=\"toc9\">LDO\u7684\u79cd\u7c7b\u548c\u4e3b\u8981\u53c2\u6570<\/h2>\n<p>LDO\u6839\u636e\u5176\u5185\u90e8\u6240\u7528\u5143\u4ef6\u548c\u8bbe\u8ba1\u601d\u8def\uff0c\u53ef\u5206\u4e3a\u591a\u79cd\u7c7b\u578b\u3002\u540c\u65f6\uff0c\u5728\u9009\u578b\u65f6\u4e5f\u5b58\u5728\u4e00\u4e9b\u9700\u8981\u5171\u540c\u8bc4\u4f30\u7684\u53c2\u6570\u3002\u672c\u8282\u5c06\u5bf9LDO\u7684\u4ee3\u8868\u6027\u79cd\u7c7b\u4ee5\u53ca\u8bc4\u4f30\u5176\u6027\u80fd\u65f6\u4e0d\u53ef\u6216\u7f3a\u7684\u4e3b\u8981\u53c2\u6570\u8fdb\u884c\u68b3\u7406\u4ecb\u7ecd\u3002<\/p>\n<h3 id=\"toc10\">\u6309\u7535\u538b\u8303\u56f4\u5206\u7c7b\uff08\u9ad8\u7535\u538b\u548c\u4f4e\u7535\u538b\u9002\u7528\uff09<\/h3>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/techclass.wfjydl.com\/wp-content\/uploads\/2025\/10\/04_voltage_range_of_ldo.png\" alt=\"LDO\u7684\u8f93\u5165\u7535\u538b\u8303\u56f4\" width=\"700\" height=\"394\" \/><\/p>\n<p>LDO\u7684\u7279\u70b9\u662f\u4f4e\u538b\u5dee\uff0c\u4f46\u5176\u8f93\u5165\u7535\u538b\u8303\u56f4\u7684\u8de8\u5ea6\u8f83\u5927\u3002\u4f8b\u5982\uff0c\u65e2\u6709\u9002\u7528\u4e8e5V\u4ee5\u4e0b\u5de5\u4f5c\u7684\u7535\u6c60\u9a71\u52a8\u7684\u4f4e\u7535\u538bLDO\uff0c\u4e5f\u6709\u9002\u7528\u4e8e\u8d85\u8fc730V\u621640V\u9ad8\u8f93\u5165\u7535\u538b\u7684\u8f66\u8f7d\u53ca\u5de5\u4e1a\u8bbe\u5907\u7684LDO\u3002\u652f\u6301\u9ad8\u7535\u538b\u7684LDO\uff0c\u5176\u529f\u7387\u6676\u4f53\u7ba1\u901a\u5e38\u5177\u6709\u66f4\u9ad8\u7684\u8010\u538b\u548c\u66f4\u5f3a\u7684\u4fdd\u62a4\u529f\u80fd\u3002\u800c\u5bf9\u4e8e\u751f\u62101V\u5de6\u53f3\u7b49\u8d85\u4f4e\u7535\u538b\u9886\u57df\u7684LDO\uff0c\u5176\u5728MOSFET\u7684\u57fa\u7840\u4e0a\u5bf9\u6805\u6781\u9a71\u52a8\u8fdb\u884c\u4f18\u5316\uff0c\u4ece\u800c\u5c06\u538b\u5dee\u964d\u81f3\u6781\u9650\u3002<\/p>\n<h3 id=\"toc11\">\u4f4e\u566a\u58f0\u3001\u4f4e\u9759\u6001\u7535\u6d41\u3001PSRR\u3001\u7ebf\u6027\u8c03\u6574\u7387\u548c\u8d1f\u8f7d\u8c03\u6574\u7387<\/h3>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/techclass.wfjydl.com\/wp-content\/uploads\/2025\/10\/05_low_noise_low_quiescent_current_psrr_line_load_regulation.png\" alt=\"\u4f4e\u566a\u58f0\u3001\u4f4e\u9759\u6001\u7535\u6d41\u3001PSRR\u3001\u7ebf\u6027\u8c03\u6574\u7387\u548c\u8d1f\u8f7d\u8c03\u6574\u7387\" width=\"700\" height=\"394\" \/><\/p>\n<h4 id=\"toc12\">\u4f4e\u566a\u58f0\u548c\u4f4e\u9759\u6001\u7535\u6d41<\/h4>\n<ul class=\"def-list def-list--dot\">\n<li><strong>\u4f4e\u566a\u58f0\u578b<\/strong><br \/>\n\u9002\u7528\u4e8e\u4e3a\u6a21\u62df\u7535\u8def\u6216\u65e0\u7ebf\u7535\u8def\u4f9b\u7535\u7b49\u65f6\uff0c\u566a\u58f0\u5bf9\u4fe1\u53f7\u8d28\u91cf\u5f71\u54cd\u8f83\u5927\u7684\u5e94\u7528\u573a\u666f\u3002\u5176\u8bbe\u8ba1\u964d\u4f4e\u4e86\u53c2\u8003\u7535\u8def\u548c\u8bef\u5dee\u653e\u5927\u5668\u7684\u566a\u58f0\uff0c\u5e76\u5c3d\u91cf\u6291\u5236\u4e86\u901a\u8def\u5143\u4ef6\u7684\u5f00\u5173\u566a\u58f0\u3002<\/li>\n<li><strong>\u4f4e\u9759\u6001\u7535\u6d41\uff08\\(I_q\\)\uff09\u578b<\/strong><br \/>\n\u76ee\u7684\u662f\u901a\u8fc7\u5c06\u5f85\u673a\u65f6\u7684\u6d88\u8017\u7535\u6d41\u63a7\u5236\u5230\u5f88\u5c0f\u6765\u5ef6\u957f\u7535\u6c60\u7684\u9a71\u52a8\u65f6\u95f4\u3002\u6709\u4e9b\u4ea7\u54c1\u901a\u8fc7\u5c0f\u5bb9\u91cf\u7535\u5bb9\u5668\u548c\u7b80\u5316\u7684\u5185\u90e8\u7535\u8def\u7ed3\u6784\uff0c\u5c06\u9759\u6001\u7535\u6d41\u63a7\u5236\u5728\u6570\u00b5A\u4ee5\u4e0b\u3002<\/li>\n<\/ul>\n<h4 id=\"toc13\">PSRR\uff08Power Supply Ripple Rejection\uff09<\/h4>\n<p>PSRR\u662f\u8861\u91cf\u8f93\u5165\u4fa7\u7684\u7eb9\u6ce2\u6216\u566a\u58f0\u6709\u591a\u5927\u7a0b\u5ea6\u4f20\u9012\u81f3\u8f93\u51fa\u4fa7\u7684\u6307\u6807\u3002\u901a\u5e38\u4ee5\u9891\u7387\u7279\u6027\u8868\u793a\uff0c\u5c24\u5176\u5728\u6570\u5341kHz\u4ee5\u4e0a\u7684\u9ad8\u9891\u533a\u95f4\u7684PSRR\u5907\u53d7\u91cd\u89c6\u3002\u4f8b\u5982\uff0c\u5728\u97f3\u9891\u7535\u8def\u6216\u9ad8\u7cbe\u5ea6\u6a21\u62df\u7535\u8def\u4e2d\uff0c\u9009\u62e9PSRR\u9ad8\u7684LDO\u53ef\u51cf\u5c11\u7535\u6e90\u566a\u58f0\u7684\u5f71\u54cd\uff0c\u6709\u52a9\u4e8e\u63d0\u9ad8\u7cbe\u5ea6\u3002\u5176\u5b9a\u4e49\u5982\u4e0b\uff1a<\/p>\n<p><!-- \u6570\u5f0f --><\/p>\n<p><span class=\"mathjax-text\">\\(PSRR(f)=20log_{10} \\left( \\frac{\\large{V_{ripple,in}(f)}}{\\large{V_{ripple,out}(f)}} \\right)\\)<\/span><\/p>\n<p>\u6570\u503c\u8d8a\u5927\uff0c\u8868\u793a\u5bf9\u8f93\u5165\u7eb9\u6ce2\u7684\u6291\u5236\u80fd\u529b\u8d8a\u5f3a\u3002\u5176\u4e2d\uff0c\\(V_{ripple,in}(f)\\)\u4e3a\u8f93\u5165\u4fa7\u7684\u7eb9\u6ce2\u7535\u538b\uff0c\\(V_{ripple,out}(f)\\)\u4e3a\u8f93\u51fa\u4fa7\u6b8b\u7559\u7684\u7eb9\u6ce2\u7535\u538b\u3002<\/p>\n<h4 id=\"toc14\">\u8fc7\u7a0b\u8ba1\u7b97\u793a\u4f8b\uff08PSRR\u6c42\u89e3\u601d\u8def\uff09<\/h4>\n<ol class=\"def-list def-list--decimal\">\n<li>\u5728\u8f93\u5165\u7aef\u65bd\u52a0\u5df2\u77e5\u632f\u5e45\u7684\u7eb9\u6ce2\u7535\u538b\uff08\u4f8b\u5982\uff1a10mV\u5cf0\u503c\uff09\u3002<\/li>\n<li>\u6d4b\u91cf\u8f93\u51fa\u7aef\u51fa\u73b0\u7684\u7eb9\u6ce2\u5e45\u5ea6\uff08\u4f8b\u5982\uff1a1mV\u5cf0\u503c\uff09\u3002<\/li>\n<li>\u5206\u522b\u4ee5\u632f\u5e45\u6216RMS\u8fdb\u884c\u6bd4\u8f83\uff0c\u5e76\u6309\u5982\u4e0b\u65b9\u5f0f\u8ba1\u7b97\uff1a<\/li>\n<\/ol>\n<p><!-- \u6570\u5f0f --><\/p>\n<p><span class=\"mathjax-text\">\\(PSRR(f)=20log_{10} \\left(\\frac{\\large{10mV}}{\\large{1mV}}\\right)=20log_{10}(10)=20dB\\)<\/span><\/p>\n<h4 id=\"toc15\">\u7ebf\u6027\u8c03\u6574\u7387\u548c\u8d1f\u8f7d\u8c03\u6574\u7387<\/h4>\n<ul class=\"def-list def-list--dot\">\n<li><strong>\u7ebf\u6027\u8c03\u6574\u7387<\/strong><br \/>\n\u8868\u793a\u8f93\u5165\u7535\u538b\u53d8\u5316\u65f6\u8f93\u51fa\u7535\u538b\u7684\u6ce2\u52a8\u7a0b\u5ea6\u3002\u901a\u5e38\u8868\u793a\u5982\u4e0b\uff08\u5e38\u7528mV\/V\u6216%\/V\u8868\u793a\uff09\uff1a<\/li>\n<\/ul>\n<p><!-- \u6570\u5f0f --><\/p>\n<p><span class=\"mathjax-text\">\\(Line \\ regulation=\\frac{\\large{\u0394V_{out}}}{\\large{\u0394V_{in}}}\\)<\/span><\/p>\n<ul class=\"def-list def-list--dot\">\n<li><strong>\u8d1f\u8f7d\u8c03\u6574\u7387<\/strong><br \/>\n\u8868\u793a\u8d1f\u8f7d\u7535\u6d41\u53d8\u5316\u65f6\u8f93\u51fa\u7535\u538b\u7684\u6ce2\u52a8\u7a0b\u5ea6\u3002\u8868\u793a\u5982\u4e0b\uff08\u5e38\u7528mV\/mA\u6216%\/mA\u8868\u793a\uff09\uff1a<\/li>\n<\/ul>\n<p><!-- \u6570\u5f0f --><\/p>\n<p><span class=\"mathjax-text\">\\(Load \\ regulation=\\frac{\\large{\u0394V_{out}}}{\\large{\u0394I_{out}}}\\)<\/span><\/p>\n<p>\u4e8c\u8005\u90fd\u662f\u91cf\u5316LDO\u7535\u538b\u63a7\u5236\u6027\u7684\u6307\u6807\u3002\u4ea7\u54c1\u89c4\u683c\u4e66\u4e2d\u4f1a\u6807\u660eMax\u503c\u548ctyp\u503c\u3002\u8003\u8651\u5de5\u4f5c\u6e29\u5ea6\u8303\u56f4\u5185\u7684\u6ce2\u52a8\u60c5\u51b5\uff0c\u5e76\u786e\u8ba4\u6240\u5b9e\u73b0\u7684\u7535\u8def\u662f\u5426\u6ee1\u8db3\u5fc5\u8981\u7684\u8981\u6c42\u975e\u5e38\u91cd\u8981\u3002<\/p>\n<h3 id=\"toc16\">\u6548\u7387\u548c\u70ed\u8bbe\u8ba1\uff08\u529f\u8017\u3001\u53d1\u70ed\u3001\u5c01\u88c5\uff09<\/h3>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/techclass.wfjydl.com\/wp-content\/uploads\/2025\/10\/06_efficiency_and_thermal_design.png\" alt=\"\u6548\u7387\u548c\u70ed\u8bbe\u8ba1\" width=\"700\" height=\"394\" \/><\/p>\n<p>\u4f5c\u4e3a\u7ebf\u6027\u7a33\u538b\u5668\u7684LDO\uff0c\u5176\u57fa\u672c\u529f\u8017\u53ef\u7528\u4ee5\u4e0b\u516c\u5f0f\u8fdb\u884c\u4f30\u7b97\uff1a<\/p>\n<p><!-- \u6570\u5f0f --><\/p>\n<p><span class=\"mathjax-text\">\\(P_{diss}=(V_{in}-V_{out})\u00d7I_{out}\\)<\/span><\/p>\n<p>\u8fd9\u662f\u8f93\u5165\u7535\u6e90\u63d0\u4f9b\u7684\u529f\u7387\u4e0e\u8f93\u51fa\u7aef\u6240\u7528\u529f\u7387\u4e4b\u5dee\u3002<\/p>\n<p>\u8fd9\u90e8\u5206\u635f\u8017\u51e0\u4e4e\u5168\u90e8\u4ee5\u70ed\u7684\u5f62\u5f0f\u6563\u53d1\uff0c\u56e0\u6b64\u5f53\u8f93\u5165\u8f93\u51fa\u7535\u538b\u5dee\u8f83\u5927\u6216\u5904\u7406\u5927\u7535\u6d41\u65f6\uff0c\u53d1\u70ed\u4f1a\u589e\u52a0\uff0c\u9700\u8981\u8003\u8651\u6563\u70ed\u5668\u6216\u7535\u8def\u677f\u5e03\u7ebf\u65f6\u7684\u6563\u70ed\u8bbe\u8ba1\u3002<\/p>\n<p>\u4e0e\u5f00\u5173\u7a33\u538b\u5668\u4e0d\u540c\uff0cLDO\u5728\u63d0\u5347\u6548\u7387\u65b9\u9762\u5b58\u5728\u4e00\u5b9a\u5c40\u9650\uff0c\u4f46\u901a\u8fc7\u5c3d\u53ef\u80fd\u964d\u4f4e\u538b\u5dee\u7535\u538b\uff0c\u53ef\u4ee5\u6291\u5236\u8f93\u5165\u4e0e\u8f93\u51fa\u95f4\u7684\u7535\u538b\u5dee\uff0c\u4ece\u800c\u51cf\u5c11\u635f\u8017\u3002\u6b64\u5916\uff0c\u7531\u4e8e\u4e0d\u540c\u5c01\u88c5\u7684\u70ed\u963b\u4e0d\u540c\uff0c\u6240\u4ee5\u9009\u62e9PowerPAD\u6216\u5012\u88c5\u82af\u7247\u7b49\u6563\u70ed\u7279\u6027\u4f18\u826f\u7684\u5c01\u88c5\u4e5f\u81f3\u5173\u91cd\u8981\u3002<\/p>\n<h3 id=\"toc17\">\u8d1f\u8f7d\u54cd\u5e94\u3001\u77ac\u6001\u54cd\u5e94\u548c\u542f\u52a8\u7279\u6027<\/h3>\n<p>\u5f53\u7535\u6e90\u8d1f\u8f7d\u53d1\u751f\u77ac\u65f6\u589e\u51cf\u65f6\u6216LDO\u542f\u52a8\u65f6\uff0c\u8f93\u51fa\u7535\u538b\u7684\u7a33\u5b9a\u7a0b\u5ea6\u662f\u8bbe\u8ba1\u9636\u6bb5\u9700\u8981\u91cd\u70b9\u5173\u6ce8\u7684\u5185\u5bb9\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/techclass.wfjydl.com\/wp-content\/uploads\/2025\/10\/07_load_response_transient_response_and_startup_characteristics.png\" alt=\"\u8d1f\u8f7d\u54cd\u5e94\u3001\u77ac\u6001\u54cd\u5e94\u548c\u542f\u52a8\u7279\u6027\" width=\"700\" height=\"394\" \/><\/p>\n<ul class=\"def-list def-list--dot\">\n<li><strong>\u8d1f\u8f7d\u54cd\u5e94<\/strong><br \/>\n\u8d1f\u8f7d\u7535\u6d41\u9aa4\u53d8\u65f6\u8f93\u51fa\u7535\u538b\u6ce2\u52a8\u7684\u5927\u5c0f\u53ca\u6062\u590d\u6240\u9700\u7684\u65f6\u95f4\u3002\u53d7\u8bef\u5dee\u653e\u5927\u5668\u7684\u901f\u5ea6\u3001\u8f93\u51fa\u7535\u5bb9\u5668\u7684\u5bb9\u91cf\u548c\u5185\u90e8\u7535\u963b\u7b49\u56e0\u7d20\u5f71\u54cd\u3002<\/li>\n<li><strong>\u77ac\u6001\u54cd\u5e94<\/strong><br \/>\n\u7535\u538b\u6682\u65f6\u51fa\u73b0\u8fc7\u51b2\u6216\u4e0b\u51b2\u7684\u73b0\u8c61\u3002\u5728\u9700\u8981\u9ad8\u901f\u54cd\u5e94\u7684\u5e94\u7528\u573a\u666f\uff08\u5982\u9ad8\u901f\u6570\u5b57\u7535\u8def\uff09\u4e2d\uff0c\u53ef\u80fd\u6210\u4e3a\u5927\u95ee\u9898\u3002<\/li>\n<li><strong>\u542f\u52a8\u7279\u6027<\/strong><br \/>\nLDO\u5728\u901a\u7535\u65f6\u8f93\u51fa\u7535\u538b\u4e0a\u5347\u8fc7\u7a0b\u4e2d\u7684\u52a8\u4f5c\u3002\u4e3a\u907f\u514d\u6025\u5267\u4e0a\u5347\u5bf9\u8d1f\u8f7d\u9020\u6210\u4e0d\u826f\u5f71\u54cd\uff0c\u90e8\u5206\u4ea7\u54c1\u5177\u6709\u8f6f\u542f\u52a8\u529f\u80fd\u3002<\/li>\n<\/ul>\n<p>\u8fd1\u5e74\u6765\uff0c\u8fd8\u51fa\u73b0\u4e86\u5c06\u63a7\u5236IC\u4e0e\u5468\u8fb9\u7535\u8def\u96c6\u6210\u4e8e\u4e00\u4f53\u7684LDO\u6a21\u5757\uff0c\u8fd9\u79cd\u51cf\u5c11\u7535\u8def\u677f\u5b89\u88c5\u5de5\u5e8f\u548c\u5916\u7f6e\u5143\u4ef6\u9009\u578b\u5de5\u4f5c\u91cf\u7684\u65b9\u6cd5\u5907\u53d7\u5173\u6ce8\u3002\u6b64\u7c7b\u6a21\u5757\u578b\u4ea7\u54c1\u7684\u5de5\u4f5c\u8303\u56f4\u548c\u6563\u70ed\u8bbe\u8ba1\u660e\u786e\uff0c\u9002\u5408\u91cd\u89c6\u5f00\u53d1\u901f\u5ea6\u7684\u5e94\u7528\u573a\u666f\u3002<\/p>\n<h2 id=\"toc18\">LDO\u4e0e\u5176\u4ed6\u65b9\u5f0f\u7684\u6bd4\u8f83\u53ca\u9009\u578b\u65b9\u6cd5<\/h2>\n<p>\u9664\u4e86LDO\u4e4b\u5916\uff0c\u8fd8\u6709\u591a\u79cd\u7535\u538b\u8c03\u8282\u65b9\u5f0f\uff0c\u6bcf\u79cd\u65b9\u5f0f\u5404\u6709\u5176\u4f18\u7f3a\u70b9\u3002\u672c\u8282\u5c06\u901a\u8fc7\u4e0e\u7ecf\u5e38\u88ab\u6bd4\u8f83\u7684\u5f00\u5173\u7a33\u538b\u5668\u548c\u4f20\u7edf\u7ebf\u6027\u7a33\u538b\u5668\u8fdb\u884c\u5bf9\u6bd4\uff0c\u91cd\u65b0\u786e\u8ba4LDO\u7684\u7279\u70b9\uff0c\u5e76\u68b3\u7406\u51fa\u4e0d\u540c\u5e94\u7528\u573a\u666f\u7684\u9009\u578b\u8981\u70b9\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/techclass.wfjydl.com\/wp-content\/uploads\/2025\/10\/08_points_for_selecting_ldo_regulators_by_application.png\" alt=\"LDO\u4e0e\u5176\u4ed6\u65b9\u5f0f\u7684\u6bd4\u8f83\u53ca\u9009\u578b\u65b9\u6cd5\" width=\"700\" height=\"394\" \/><\/p>\n<h3 id=\"toc19\">\u5f00\u5173\u7a33\u538b\u5668 vs LDO\uff08\u529f\u8017\u548c\u6548\u7387\u6bd4\u8f83\uff09<\/h3>\n<p>\u5f00\u5173\u7a33\u538b\u5668\u901a\u8fc7\u8109\u5bbd\u8c03\u5236\uff08PWM\uff09\u548c\u8109\u51b2\u9891\u7387\u8c03\u5236\uff08PFM\uff09\u7b49\u65b9\u5f0f\u4f7f\u5f00\u5173\u5668\u4ef6\u9ad8\u901f\u5bfc\u901a\u548c\u5173\u65ad\uff0c\u7ecf\u7531\u7535\u611f\u548c\u7535\u5bb9\u5668\u5f62\u6210\u8f93\u51fa\u7535\u538b\u3002\u4ee3\u8868\u6027\u65b9\u5f0f\u6709\u964d\u538b\uff08Buck\uff09\u3001\u5347\u538b\uff08Boost\uff09\u4e0e\u5347\u964d\u538b\u4e24\u7528\uff08Buck-Boost\uff09\u7b49\u3002\u5728\u6676\u4f53\u7ba1\u4e0e\u4e8c\u6781\u7ba1\uff08\u6216\u540c\u6b65\u6574\u6d41MOSFET\uff09\u635f\u8017\u66f4\u5c0f\u65f6\u6d41\u901a\u7535\u6d41\uff0c\u4ece\u800c\u5b9e\u73b0\u9ad8\u6548\u7387\uff0c\u6548\u7387\u8d85\u8fc780\u301c90%\u4e5f\u5e76\u4e0d\u7f55\u89c1\u3002<\/p>\n<p>\u53e6\u4e00\u65b9\u9762\uff0c\u5f00\u5173\u7a33\u538b\u5668\u901a\u5e38\u9700\u8981\u7535\u611f\u548c\u5927\u5bb9\u91cf\u7535\u5bb9\u5668\u7b49\u5916\u7f6e\u5143\u4ef6\uff0c\u5360\u7528\u5b89\u88c5\u7a7a\u95f4\u4e14\u7535\u8def\u8bbe\u8ba1\u590d\u6742\u3002\u6b64\u5916\uff0c\u9ad8\u901f\u5f00\u5173\u5bb9\u6613\u5f15\u53d1\u566a\u58f0\uff08EMI\uff09\u4e0e\u7eb9\u6ce2\uff0c\u56e0\u6b64\u9700\u8003\u8651\u901a\u8fc7\u5c4f\u853d\u6216\u4f18\u5316\u5e03\u5c40\u4e88\u4ee5\u6291\u5236\u3002<\/p>\n<p>LDO\u4ee5\u7ebf\u6027\u65b9\u5f0f\u63a7\u5236\u4ece\u8f93\u5165\u7535\u538b\u81f3\u8f93\u51fa\u7535\u538b\u7684\u7535\u529b\uff0c\u56e0\u6b64\u4f1a\u4ea7\u751f\uff08\\(V_{in}\\) \u2013 \\(V_{out}\\)\uff09\u00d7\\(I_{out}\\)\u6240\u793a\u7684\u635f\u8017\uff0c\u8fd9\u90e8\u5206\u635f\u8017\u4f5c\u4e3a\u70ed\u91cf\u88ab\u8017\u6563\u6389\u3002\u4ece\u6548\u7387\u89d2\u5ea6\u6bd4\u8f83\uff0c\u5f00\u5173\u7a33\u538b\u5668\u6839\u636e\u8d1f\u8f7d\u7535\u6d41\u548c\u8bbe\u8ba1\u7684\u4e0d\u540c\uff0c\u53ef\u5b9e\u73b080%\u81f390%\u4ee5\u4e0a\u7684\u6548\u7387\uff0c\u800cLDO\u7684\u6548\u7387\u8fd1\u4f3c\u5982\u4e0b\uff1a<\/p>\n<p><!-- \u6570\u5f0f --><\/p>\n<p><span class=\"mathjax-text\">\\(\u03b7\u2248\\frac{\\large{V_{out}}}{\\large{V_{in}}}\u00d7100\\%\\)<\/span><\/p>\n<p>\u8f93\u5165\u8f93\u51fa\u7535\u538b\u5dee\u8d8a\u5927\uff0c\u6548\u7387\u5c31\u8d8a\u4f4e\uff1b\u4f46\u5f53\u538b\u5dee\u7535\u538b\u975e\u5e38\u5c0f\u65f6\uff0c\u7531\u4e8e\uff08\\(V_{in}\\) \u2013 \\(V_{out}\\)\uff09\u672c\u8eab\u53ef\u4ee5\u6291\u5236\u5f97\u5f88\u5c0f\uff0c\u56e0\u6b64\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\u6709\u65f6\u4ecd\u53ef\u7ef4\u6301\u4e00\u5b9a\u7684\u6548\u7387\u3002\u6b64\u5916\uff0cLDO\u5177\u6709\u4e0d\u6613\u4ea7\u751f\u9ad8\u9891\u566a\u58f0\u7684\u4f18\u70b9\uff0c\u540c\u65f6\u5176\u5916\u7f6e\u5143\u4ef6\u53ea\u9700\u8f93\u5165\u8f93\u51fa\u7535\u5bb9\u5668\uff0c\u8fd9\u4f7f\u5f97\u5b83\u5b89\u88c5\u7b80\u5355\u4e14\u8f93\u51fa\u7eb9\u6ce2\u8f83\u5c0f\u3002<\/p>\n<p>\u603b\u800c\u8a00\u4e4b\uff0c\u82e5\u5b58\u5728\u8f83\u5927\u7684\u538b\u964d\u6216\u66f4\u52a0\u6ce8\u91cd\u9ad8\u6548\u7387\u65f6\uff0c\u66f4\u9002\u5408\u9009\u7528\u5f00\u5173\u7a33\u538b\u5668\uff1b\u800c\u5728\u7535\u538b\u5dee\u8f83\u5c0f\u7684\u73af\u5883\u6216\u5bf9\u566a\u58f0\u654f\u611f\u7684\u6a21\u62df\u7535\u8def\u7b49\u5e94\u7528\u4e2d\uff0cLDO\u66f4\u4e3a\u6709\u6548\u3002<\/p>\n<h3 id=\"toc20\">\u4f20\u7edf\u7ebf\u6027\u7a33\u538b\u5668 vs LDO\uff08\u4e0e\u4e09\u7aef\u7a33\u538b\u5668\u7b49\u7684\u533a\u522b\uff09<\/h3>\n<p>\u4f20\u7edf\u7ebf\u6027\u7a33\u538b\u5668\u8bbe\u8ba1\u65f6\uff0c\u901a\u5e38\u8981\u6c42\u8f93\u5165\u7535\u538b\u7559\u6709\u7ea62\uff5e3V\u7684\u88d5\u91cf\uff0c\u5e76\u4ee5\u901a\u8def\u5143\u4ef6\u5728\u8fdc\u79bb\u9971\u548c\u533a\u7684\u72b6\u6001\u4e0b\u8fdb\u884c\u63a7\u5236\u4e3a\u524d\u63d0\u3002\u800cLDO\u5219\u901a\u8fc7\u5c06\u901a\u8def\u5143\u4ef6\u7684\u5de5\u4f5c\u70b9\u63a8\u81f3\u63a5\u8fd1\u9971\u548c\u7684\u72b6\u6001\uff0c\u4ece\u800c\u6210\u529f\u5730\u5c06\u538b\u5dee\u63a7\u5236\u5230\u6570\u767emV\u4ee5\u4e0b\u3002<\/p>\n<ul class=\"def-list def-list--dot\">\n<li><strong>\u901a\u8def\u5143\u4ef6\u7684\u9009\u62e9\u4e0e\u7ed3\u6784<\/strong><br \/>\n\u4f20\u7edf\u7ebf\u6027\u7a33\u538b\u5668\u4e3a\u5b9e\u73b0\u63a7\u5236\uff0c\u901a\u5e38\u5728\u57fa\u6781\u2013\u53d1\u5c04\u6781\u7535\u538b\u6216\u96c6\u7535\u6781\u2013\u53d1\u5c04\u6781\u7535\u538b\u4e0a\u7559\u51fa\u4e00\u5b9a\u88d5\u91cf\uff1b\u800cLDO\u901a\u8fc7\u91c7\u7528MOSFET\u4f7f\u5176\u5728\u6805\u6e90\u7535\u538b\u8f83\u5c0f\u65f6\u4e5f\u80fd\u5de5\u4f5c\uff0c\u6216\u901a\u8fc7\u7535\u8def\u8bbe\u8ba1\u4f7f\u53cc\u6781\u6676\u4f53\u7ba1\u4e5f\u5141\u8bb8\u5728\u63a5\u8fd1\u9971\u548c\u72b6\u6001\u4e0b\u8fdb\u884c\u63a7\u5236\u7b49\uff0c\u4ee5\u6b64\u964d\u4f4e\u538b\u5dee\u7535\u538b\u3002<\/li>\n<li><strong>\u53cd\u9988\u7535\u8def\u7684\u4f18\u5316<\/strong><br \/>\n\u4f20\u7edf\u7ebf\u6027\u7a33\u538b\u5668\u7684\u63a7\u5236\u7279\u6027\u76f8\u5bf9\u5bbd\u677e\uff0c\u800cLDO\u5219\u901a\u5e38\u901a\u8fc7\u4f18\u5316\u8bef\u5dee\u653e\u5927\u5668\u7684\u504f\u7f6e\u7535\u538b\u548c\u5185\u90e8\u53c2\u8003\u6e90\u8bbe\u8ba1\uff0c\u786e\u4fdd\u5728\u8f83\u4f4e\u7535\u538b\u5dee\u4e0b\u4ecd\u80fd\u5b9e\u73b0\u7a33\u5b9a\u63a7\u5236\u3002<\/li>\n<li><strong>\u5e94\u7528\u9886\u57df\u7684\u5dee\u5f02<\/strong><br \/>\n\u4f20\u7edf\u7ebf\u6027\u7a33\u538b\u5668\u591a\u7528\u4e8e\u5c06AC\u9002\u914d\u5668\u7b49\u8f83\u9ad8\u7684\u8f93\u5165\u7535\u538b\u964d\u538b\u5e76\u8f7b\u677e\u5b9e\u73b0\u7a33\u538b\u7684\u5e94\u7528\u573a\u666f\uff0c\u800cLDO\u5219\u5728\u7535\u6c60\u9a71\u52a8\u6216\u4f7f\u75281\uff5e2V\u4f4e\u7535\u538b\u7684\u6570\u5b57IC\u7b49\u8981\u6c42\u4f4e\u7535\u538b\u548c\u4f4e\u529f\u8017\u7684\u73af\u5883\u4e2d\u66f4\u5177\u53d1\u6325\u4f18\u52bf\u3002<\/li>\n<\/ul>\n<h3 id=\"toc21\">\u4e0d\u540c\u5e94\u7528\u573a\u666f\u4e2d\u8003\u8651\u7684LDO\u9009\u578b\u8981\u70b9<\/h3>\n<p>LDO\u7684\u4e3b\u8981\u9009\u578b\u8981\u70b9\u5982\u4e0b\uff1a<\/p>\n<ul class=\"def-list def-list--dot\">\n<li><strong>\u6240\u9700\u7684\u8f93\u5165\u8f93\u51fa\u7535\u538b\u5dee<\/strong><br \/>\n\u5f53\u7535\u6c60\u7684\u7ec8\u6b62\u7535\u538b\uff08\u6700\u4f4e\u7535\u538b\uff09\u63a5\u8fd1\u8f93\u51fa\u7535\u538b\u65f6\uff0c\u5fc5\u987b\u9009\u62e9\u538b\u5dee\u7535\u538b\u5c0f\u7684LDO\u3002<\/li>\n<li><strong>\u53ef\u5bb9\u8bb8\u7684\u53d1\u70ed\u91cf<\/strong><br \/>\n\u7531\u4e8eLDO\u7684\uff08\\(V_{in}\\) \u2013 \\(V_{out}\\)\uff09\u00d7 \\(I_{out}\\)\u4f1a\u8f6c\u5316\u4e3a\u70ed\uff0c\u56e0\u6b64\u6563\u70ed\u8bbe\u8ba1\u548c\u5c01\u88c5\u7684\u9009\u62e9\u5f88\u91cd\u8981\u3002<\/li>\n<li><strong>\u566a\u58f0\u654f\u611f\u5ea6<\/strong><br \/>\n\u5728\u6a21\u62df\u7535\u8def\u6216\u9ad8\u9891\u7535\u8def\u4e2d\uff0cPSRR\u548c\u4f4e\u566a\u58f0\u7279\u6027\u5c24\u4e3a\u91cd\u8981\u3002<\/li>\n<li><strong>\u6d88\u8017\u7535\u6d41<\/strong><br \/>\n\u5bf9\u4e8e\u5e0c\u671b\u5c3d\u91cf\u964d\u4f4e\u5f85\u673a\u7535\u6d41\u7684\u5e94\u7528\u573a\u666f\uff0c\u4f18\u5148\u9009\u62e9\u4f4e\\(I_q\\)\u578b\u3002<\/li>\n<li><strong>\u8d1f\u8f7d\u6ce2\u52a8\u548c\u54cd\u5e94\u901f\u5ea6<\/strong><br \/>\n\u5bf9\u4e8e\u6709\u6025\u5267\u8d1f\u8f7d\u6ce2\u52a8\u7684\u7535\u8def\uff0c\u5efa\u8bae\u9009\u7528\u77ac\u6001\u54cd\u5e94\u6027\u80fd\u4f18\u5f02\u7684LDO\u3002<\/li>\n<\/ul>\n<h2 id=\"toc22\">LDO\u8bbe\u8ba1\u548c\u5b89\u88c5\u4e2d\u9700\u638c\u63e1\u7684\u5173\u952e\u8981\u70b9<\/h2>\n<p>\u5728\u5b9e\u9645\u5c06LDO\u5d4c\u5165\u7535\u8def\u65f6\uff0c\u5e94\u53c2\u8003\u4ea7\u54c1\u89c4\u683c\u4e66\u4e2d\u63a8\u8350\u7684\u5143\u4ef6\u548c\u5e03\u5c40\u6307\u5357\uff0c\u8fdb\u884c\u6ee1\u8db3\u5404\u9879\u7279\u6027\u7684\u8bbe\u8ba1\u3002\u672c\u8282\u5c06\u9010\u6b65\u4ecb\u7ecd\u5178\u578b\u7684\u8bbe\u8ba1\u6d41\u7a0b\u548c\u6ce8\u610f\u4e8b\u9879\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/techclass.wfjydl.com\/wp-content\/uploads\/2025\/10\/09_key_point_in_designing_and_implementing_an_ldo.png\" alt=\"LDO\u8bbe\u8ba1\u548c\u5b89\u88c5\u4e2d\u9700\u638c\u63e1\u7684\u5173\u952e\u8981\u70b9\" width=\"700\" height=\"394\" \/><\/p>\n<h3 id=\"toc23\">\u7535\u8def\u793a\u4f8b\u548c\u8bbe\u8ba1\u6d41\u7a0b\uff08\u57fa\u7840\u8bbe\u8ba1\uff5e\u5143\u4ef6\u9009\u578b\uff09<\/h3>\n<p>LDO\u7684\u8bbe\u8ba1\u6d41\u7a0b\u5927\u81f4\u9075\u5faa\u4ee5\u4e0b\u6b65\u9aa4\uff1a<\/p>\n<ol class=\"def-list def-list--decimal\">\n<li><strong>\u786e\u8ba4\u8f93\u5165\u8f93\u51fa\u7535\u538b\u8303\u56f4<\/strong><br \/>\n\u6839\u636e\u662f\u7535\u6c60\u9a71\u52a8\u8fd8\u662fAC\u9002\u914d\u5668\u7b49\uff0c\u638c\u63e1\u9884\u671f\u7535\u6e90\u7684\u6700\u5c0f\u548c\u6700\u5927\u7535\u538b\u3002<\/li>\n<li><strong>\u786e\u8ba4\u6240\u9700\u7684\u8f93\u51fa\u7535\u6d41\u548c\u8d1f\u8f7d\u7279\u6027<\/strong><br \/>\n\u638c\u63e1\u6700\u5927\u8d1f\u8f7d\u7535\u6d41\u5c06\u8fbe\u5230\u591a\u5c11A\uff0c\u5e76\u4e86\u89e3\u77ac\u65f6\u8d1f\u8f7d\u6ce2\u52a8\u5e45\u5ea6\u3002<\/li>\n<li><strong>\u786e\u8ba4LDO\u5019\u9009\u4ea7\u54c1<\/strong><br \/>\n\u53c2\u8003\u4ea7\u54c1\u89c4\u683c\u4e66\uff0c\u5bfb\u627e\u6ee1\u8db3\u538b\u5dee\u7535\u538b\u3001PSRR\u3001\u6d88\u8017\u7535\u6d41\u3001\u4fdd\u62a4\u529f\u80fd\u7b49\u8981\u6c42\u7684\u4ea7\u54c1\u3002<\/li>\n<li><strong>\u9009\u62e9\u5916\u56f4\u5143\u4ef6<\/strong><br \/>\n\u7531\u4e8e\u8f93\u51fa\u7535\u5bb9\u5668\u7684\u5bb9\u91cf\u548cESR\u8303\u56f4\u76f4\u63a5\u5173\u7cfb\u5230LDO\u5de5\u4f5c\u7684\u7a33\u5b9a\u6027\uff0c\u52a1\u5fc5\u786e\u8ba4\u5236\u9020\u5546\u7684\u63a8\u8350\u503c\u3002<\/li>\n<li><strong>\u70ed\u8bbe\u8ba1<\/strong><br \/>\n\u7ed3\u5408\u5c01\u88c5\u548c\u5b89\u88c5\u6761\u4ef6\uff0c\u8ba1\u7b97\uff08\\(V_{in}\\) \u2013 \\(V_{out}\\)\uff09\u00d7 \\(I_{out}\\)\u662f\u5426\u5728\u5bb9\u8bb8\u8303\u56f4\u5185\u3002\u5fc5\u8981\u65f6\u8003\u8651\u6269\u5927\u94dc\u7b94\u9762\u79ef\u7b49\u6563\u70ed\u63aa\u65bd\u3002<\/li>\n<\/ol>\n<h3 id=\"toc24\">\u5916\u56f4\u5143\u4ef6\u9009\u578b\uff08\u8f93\u5165\u4e0e\u8f93\u51fa\u7535\u5bb9\u5668\u3001\u9632\u53cd\u5411\u7535\u6d41\u4e8c\u6781\u7ba1\u7b49\uff09<\/h3>\n<p>LDO\u7684\u8f93\u51fa\u7535\u5bb9\u5668\u5bf9\u4e8e\u786e\u4fdd\u76f8\u4f4d\u8865\u507f\u4e0e\u8bef\u5dee\u653e\u5927\u5668\u7684\u7a33\u5b9a\u5de5\u4f5c\u81f3\u5173\u91cd\u8981\u3002\u4ea7\u54c1\u89c4\u683c\u4e66\u4e2d\u901a\u5e38\u4f1a\u5199\u660e\u63a8\u8350\u5bb9\u91cf\u548cESR\u8303\u56f4\uff0c\u82e5\u504f\u79bb\u8fd9\u4e9b\u8303\u56f4\uff0c\u53ef\u80fd\u5bfc\u81f4\u632f\u8361\u6216\u77ac\u6001\u54cd\u5e94\u6076\u5316\u3002<\/p>\n<p>\u8f93\u5165\u7535\u5bb9\u5668\u7528\u4e8e\u8f85\u52a9\u77ac\u65f6\u7535\u6d41\u4f9b\u5e94\u4ee5\u53ca\u6291\u5236\u8f93\u5165\u7535\u6e90\u7684\u7eb9\u6ce2\u3002\u901a\u5e38\u91c7\u7528\u6570\u00b5F\u7684\u9676\u74f7\u7535\u5bb9\u5668\uff0c\u4f46\u82e5\u9884\u8ba1\u5b58\u5728\u8f83\u5927\u7684\u8d1f\u8f7d\u6ce2\u52a8\uff0c\u6709\u65f6\u53ef\u8ffd\u52a0\u66f4\u5927\u5bb9\u91cf\u7684\u7535\u5bb9\u5668\u3002<\/p>\n<p>\u9632\u53cd\u5411\u7535\u6d41\u4e8c\u6781\u7ba1\u5728\u5b58\u5728\u7535\u6c60\u7b49\u5907\u4efd\u7535\u6e90\u65f6\u9700\u8981\u8003\u8651\u4f7f\u7528\u3002\u5728\u591a\u7535\u6e90\u5207\u6362\u7684\u8bbe\u8ba1\u4e2d\uff0c\u901a\u5e38\u4f1a\u52a0\u5165\u4e8c\u6781\u7ba1\u4ee5\u9632\u6b62\u7535\u6d41\u901a\u8fc7LDO\u7684\u901a\u8def\u5143\u4ef6\u53d1\u751f\u53cd\u5411\u6d41\u52a8\u3002<\/p>\n<h3 id=\"toc25\">\u5e03\u5c40\u548c\u5e03\u7ebf\u7684\u6ce8\u610f\u4e8b\u9879\uff08\u566a\u58f0\u5bf9\u7b56\u548cGND\u5e03\u7ebf\u7b49\uff09<\/h3>\n<p>\u867d\u8bf4LDO\u57fa\u672c\u4e0a\u566a\u58f0\u8f83\u5c11\uff0c\u4f46\u4ecd\u5efa\u8bae\u5728\u5e03\u5c40\u65f6\u6ce8\u610f\u4ee5\u4e0b\u4e8b\u9879\uff1a<\/p>\n<ul class=\"def-list def-list--dot\">\n<li><strong>\u786e\u4fdd\u6700\u77ed\u8def\u5f84<\/strong><br \/>\n\u5c06\u8f93\u5165\u7535\u5bb9\u5668\u548c\u8f93\u51fa\u7535\u5bb9\u5668\u5b89\u88c5\u5728LDO\u5f15\u811a\u9644\u8fd1\uff0c\u4ee5\u51cf\u5c11\u4e0d\u5fc5\u8981\u7684\u5e03\u7ebf\u7535\u611f\u548c\u5bc4\u751f\u7535\u963b\u3002<\/li>\n<li><strong>\u7edf\u4e00\u7ba1\u7406GND\u5e03\u7ebf<\/strong><br \/>\n\u6839\u636e\u9700\u8981\u5c06\u7535\u6e90GND\u548c\u4fe1\u53f7GND\u5206\u79bb\uff0c\u9632\u6b62\u566a\u58f0\u6df7\u5165\u6d4b\u91cf\u7cfb\u7edf\u3002<\/li>\n<li><strong>\u786e\u4fdd\u70ed\u6269\u6563<\/strong><br \/>\n\u82e5\u6709\u6563\u70ed\u710a\u76d8\uff0c\u5e94\u5728\u7535\u8def\u677f\u5185\u5c42\u6216\u80cc\u9762\u8bbe\u7f6e\u8fc7\u5b54\uff0c\u4ee5\u4fc3\u8fdb\u6563\u70ed\u3002<\/li>\n<\/ul>\n<h3 id=\"toc26\">\u4fdd\u62a4\u529f\u80fd\u7684\u8fd0\u7528\u548c\u7535\u6e90\u65f6\u5e8f\uff08\u6309\u9700\u7b80\u8981\u4f7f\u7528\uff09<\/h3>\n<p>LDO\u901a\u5e38\u914d\u5907\u8fc7\u6d41\u4fdd\u62a4\u3001\u8fc7\u70ed\u4fdd\u62a4\u7b49\u5b89\u5168\u529f\u80fd\uff0c\u4f46\u91cd\u8981\u7684\u662f\u4e0d\u8981\u8fc7\u5ea6\u4f9d\u8d56\u8fd9\u4e9b\u529f\u80fd\uff0c\u800c\u5e94\u8bc4\u4f30\u5b9e\u9645\u73af\u5883\u4e2d\u53ef\u80fd\u51fa\u73b0\u7684\u8fc7\u8f7d\u7a0b\u5ea6\u540e\u8fdb\u884c\u9009\u578b\u3002<\/p>\n<p>\u53e6\u5916\uff0c\u5bf9\u4e8e\u591a\u7535\u538b\u7684CPU\u548cFPGA\u7b49\u9700\u8981\u591a\u8def\u7535\u6e90\u7ebf\u6309\u987a\u5e8f\u542f\u52a8\u65f6\uff0c\u6709\u65f6\u4f1a\u4f7f\u7528LDO\u7684\u4f7f\u80fd\u5f15\u811a\u8fdb\u884c\u65f6\u5e8f\u63a7\u5236\u3002\u7ed3\u5408\u5ef6\u65f6\u7535\u8def\u6216\u5fae\u63a7\u5236\u5668\u63a7\u5236\uff0c\u4f7f\u6240\u9700\u7535\u6e90\u9002\u5f53\u542f\u52a8\uff0c\u4ece\u800c\u63d0\u5347\u7cfb\u7edf\u8fd0\u884c\u7684\u53ef\u9760\u6027\u3002<\/p>\n<h2 id=\"toc27\">LDO\u7684\u6700\u65b0\u6280\u672f\u52a8\u5411<\/h2>\n<p>\u8fd1\u5e74\u6765\uff0c\u5728LDO\u9886\u57df\uff0c\u9488\u5bf9\u66f4\u4e25\u82db\u7684\u4f4e\u529f\u8017\u8981\u6c42\u4e0e\u7f29\u51cf\u5b89\u88c5\u7a7a\u95f4\u7684\u9700\u6c42\u65e5\u76ca\u589e\u591a\uff0c\u4ee5\u4e0b\u65b0\u7684\u6280\u672f\u65b9\u6848\u5907\u53d7\u5173\u6ce8\u3002\u8fd9\u4e9b\u6280\u672f\u901a\u8fc7\u5b9e\u73b0\u201c\u8d85\u5c0f\u5bb9\u91cf\u8f93\u51fa\u7535\u5bb9\u5668\u7684\u9002\u7528\u201d\u548c\u201c\u9ad8\u901f\u8d1f\u8f7d\u54cd\u5e94\u6027\u80fd\u7684\u63d0\u5347\u201d\uff0c\u6b63\u5728\u9010\u6b65\u514b\u670d\u4f20\u7edfLDO\u96be\u4ee5\u5e94\u5bf9\u7684\u96be\u9898\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/techclass.wfjydl.com\/wp-content\/uploads\/2025\/10\/10_latest_technological_trends_in_ldos.png\" alt=\"LDO\u7684\u6700\u65b0\u6280\u672f\u52a8\u5411\" width=\"700\" height=\"394\" \/><\/p>\n<h3 id=\"toc28\">\u4f7f\u7528\u5f88\u5c0f\u5bb9\u91cf\u7684\u7535\u5bb9\u5668\u4e5f\u80fd\u7a33\u5b9a\u5de5\u4f5c\u7684\u6280\u672f<\/h3>\n<ul class=\"def-list def-list--dot\">\n<li><strong>\u6280\u672f\u6982\u8981<\/strong><br \/>\n\u4f20\u7edfLDO\u4e3a\u786e\u4fdd\u7a33\u5b9a\u5de5\u4f5c\uff0c\u901a\u5e38\u9700\u89811\u00b5F\u5de6\u53f3\u7684\u8f93\u51fa\u7535\u5bb9\u5668\u3002\u6700\u8fd1\uff0c\u901a\u8fc7\u5bf9\u6a21\u62df\u7535\u8def\u5bc4\u751f\u5206\u91cf\u7684\u5f7b\u5e95\u4f18\u5316\uff0c\u6539\u8fdb\u8bef\u5dee\u653e\u5927\u5668\u548c\u5e03\u7ebf\uff0c\u51fa\u73b0\u4e86\u4f7f\u7528nF\u91cf\u7ea7\u7684\u7535\u5bb9\u5668\u4e5f\u4e0d\u4f1a\u53d1\u751f\u632f\u8361\u7684\u63a7\u5236\u6280\u672f\u3002<\/li>\n<li>\n<div><strong>\u4e3b\u8981\u4f18\u52bf<\/strong><\/div>\n<ul>\n<li><strong>\u51cf\u5c11\u5143\u4ef6\u6570\u91cf\u548c\u5b89\u88c5\u7a7a\u95f4<\/strong>\uff1a\u53ef\u5927\u5e45\u51cf\u5c11\u8f93\u51fa\u7535\u5bb9\u5668\u7684\u5bb9\u91cf\u4e0e\u6570\u91cf<\/li>\n<li><strong>\u964d\u4f4e\u6210\u672c<\/strong>\uff1a\u901a\u8fc7\u7535\u5bb9\u5668\u5c0f\u578b\u5316\u6216\u6570\u91cf\u524a\u51cf\uff0c\u6709\u671b\u964d\u4f4e\u6210\u672c<\/li>\n<li><strong>\u63d0\u5347\u53ef\u9760\u6027<\/strong>\uff1a\u901a\u8fc7\u51cf\u5c11\u6c7d\u8f66\u4e0e\u5de5\u4e1a\u7b49\u9886\u57df\u4e2d\u5e38\u7528\u7684\u7535\u5bb9\u5668\u5b89\u88c5\u6570\u91cf\uff0c\u964d\u4f4e\u5143\u4ef6\u6545\u969c\u98ce\u9669\u548c\u5b89\u88c5\u4e0d\u826f\u98ce\u9669<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3 id=\"toc29\">\u5b9e\u73b0\u9ad8\u901f\u8d1f\u8f7d\u54cd\u5e94\u7684\u6280\u672f<\/h3>\n<ul class=\"def-list def-list--dot\">\n<li><strong>\u6280\u672f\u6982\u8981<\/strong><br \/>\n\u4e3a\u4e86\u5728\u8d1f\u8f7d\u7535\u6d41\u6025\u5267\u53d8\u5316\u65f6\u5c06\u8f93\u51fa\u7535\u538b\u7684\u6ce2\u52a8\u5e45\u5ea6\u63a7\u5236\u5728\u66f4\u5c0f\u8303\u56f4\uff0c\u5df2\u5f00\u53d1\u51fa\u63d0\u5347LDO\u5185\u90e8\u53cd\u9988\u7535\u8def\u4e0e\u8bef\u5dee\u653e\u5927\u7535\u8def\u901f\u5ea6\u7684\u6280\u672f\u3002\u4ee3\u8868\u6027\u7684\u65b9\u6cd5\u662f\u901a\u8fc7\u5c06\u63a7\u5236\u7cfb\u7edf\u548c\u8865\u507f\u7cfb\u7edf\u5206\u79bb\u6216\u7ec4\u5408\u591a\u7ea7\u4e13\u7528\u653e\u5927\u5668\uff0c\u4ece\u800c\u5728\u907f\u514d\u53d1\u751f\u4e0d\u7a33\u5b9a\u632f\u8361\u7684\u524d\u63d0\u4e0b\uff0c\u5c06\u54cd\u5e94\u901f\u5ea6\u63d0\u5347\u81f3\u6781\u9650\u3002<\/li>\n<li>\n<div><strong>\u4e3b\u8981\u4f18\u52bf<\/strong><\/div>\n<ul>\n<li><strong>\u63d0\u5347\u7535\u6e90\u54c1\u8d28<\/strong>\uff1a\u53ef\u8fc5\u901f\u54cd\u5e94\u6570\u5b57IC\u6025\u5267\u7684\u6d88\u8017\u7535\u6d41\u53d8\u5316\u548c\u9ad8\u7cbe\u5ea6\u6a21\u62df\u7535\u8def\u7684\u77ac\u65f6\u8d1f\u8f7d\u6ce2\u52a8<\/li>\n<li><strong>\u4f18\u5316\u7535\u5bb9\u5668\u5bb9\u91cf<\/strong>\uff1a\u5373\u4f7f\u4e0d\u91c7\u7528\u5927\u5bb9\u91cf\u7535\u5bb9\u5668\uff0c\u4e5f\u80fd\u83b7\u5f97\u8db3\u591f\u7684\u54cd\u5e94\u6027\u80fd\uff0c\u4ece\u800c\u63d0\u5347\u8bbe\u8ba1\u7075\u6d3b\u6027<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3 id=\"toc30\">\u6301\u7eed\u6f14\u8fdb\u4e0e\u672a\u6765\u5c55\u671b<\/h3>\n<ul class=\"def-list def-list--dot\">\n<li><strong>\u65b0\u6280\u672f\u7684\u7ed3\u5408<\/strong><br \/>\n\u901a\u8fc7\u5c06\u201c\u9002\u7528\u5f88\u5c0f\u5bb9\u91cf\u7684\u7535\u5bb9\u5668\u201d\u548c\u201c\u9ad8\u901f\u8d1f\u8f7d\u54cd\u5e94\u6280\u672f\u201d\u76f8\u7ed3\u5408\uff0c\u6b63\u9010\u6b65\u5b9e\u73b0\u4f8b\u5982\u91c7\u7528nF\u7ea7\u7535\u5bb9\u5668\u65f6\uff0c\u4ecd\u53ef\u5728\u6025\u5267\u7684\u8d1f\u8f7d\u6ce2\u52a8\u4e0b\u4fdd\u6301\u7a33\u5b9a\u8f93\u51fa\u7684LDO\u3002<\/li>\n<li>\n<div><strong>\u5e94\u7528\u9886\u57df\u7684\u6269\u5c55<\/strong><\/div>\n<p>\u7269\u8054\u7f51\u8bbe\u5907\u548c\u53ef\u7a7f\u6234\u8bbe\u5907\u7b49\u9700\u8981\u517c\u987e\u4f4e\u529f\u8017\u548c\u5c0f\u578b\u5316\u7684\u5e94\u7528\u9700\u6c42\u9884\u8ba1\u5c06\u6301\u7eed\u589e\u957f\u3002\u6b64\u5916\uff0c\u5728\u6c7d\u8f66\u548c\u5de5\u4e1a\u8bbe\u5907\u9886\u57df\uff0c\u4e0d\u4ec5\u8981\u6c42\u7f29\u5c0f\u5b89\u88c5\u7a7a\u95f4\uff0c\u8fd8\u9700\u5b9e\u73b0\u66f4\u9ad8\u53ef\u9760\u6027\uff08\u6ee1\u8db3\u6e29\u5ea6\u7279\u6027\u548c\u8010\u538b\u7b49\u5b89\u5168\u6807\u51c6\uff09\uff0c\u8fd9\u4f7f\u5f97\u914d\u5907\u4e0a\u8ff0\u5148\u8fdb\u6280\u672f\u7684LDO\u53d7\u5230\u8d8a\u6765\u8d8a\u591a\u7684\u5173\u6ce8\u3002<\/p>\n<p>\u5404\u534a\u5bfc\u4f53\u5236\u9020\u5546\u6b63\u4e0d\u65ad\u6269\u5145\u96c6\u6210\u4e86\u591a\u4e2a\u7535\u6e90\u7ebf\u7684\u6a21\u5757\u5316LDO\u4ee5\u53ca\u5b9e\u73b0\u7cfb\u7edf\u6574\u4f53\u8282\u80fd\u7684\u89e3\u51b3\u65b9\u6848\uff0c\u5176\u5e94\u7528\u9886\u57df\u6b63\u5728\u4e0d\u65ad\u6269\u5927\u3002<\/li>\n<\/ul>\n<h2 id=\"toc31\">\u603b\u7ed3<\/h2>\n<p>LDO\u80fd\u591f\u5728\u4fdd\u6301\u8f93\u5165\u8f93\u51fa\u7535\u538b\u5dee\u8f83\u5c0f\u7684\u72b6\u6001\u4e0b\u5de5\u4f5c\uff0c\u56e0\u4f53\u79ef\u5c0f\u3001\u4f4e\u566a\u58f0\u3001\u8282\u80fd\u800c\u88ab\u5e94\u7528\u4e8e\u5404\u7c7b\u8bbe\u5907\u3002\u9002\u7528\u4e8e\u79fb\u52a8\u8bbe\u5907\u3001\u8f66\u8f7d\u8bbe\u5907\u548c\u5de5\u4e1a\u8bbe\u5907\u7b49\u5404\u79cd\u9886\u57df\u4e2d\u9700\u8981\u4f4e\u529f\u8017\u548c\u6563\u70ed\u5bf9\u7b56\u7684\u7535\u8def\u3002<\/p>\n<h3 id=\"toc32\">LDO\u57fa\u7840\u8981\u70b9\u56de\u987e<\/h3>\n<ul class=\"def-list def-list--dot\">\n<li><strong>\u5b9a\u4e49<\/strong>\uff1aLow Dropout Regulator\u662f\u5373\u4f7f\u8f93\u5165\u8f93\u51fa\u7535\u538b\u5dee\u5f88\u5c0f\u4e5f\u80fd\u5de5\u4f5c\u7684\u7ebf\u6027\u7a33\u538b\u5668<\/li>\n<li><strong>\u7535\u8def\u7ed3\u6784<\/strong>\uff1a\u901a\u8fc7\u901a\u8def\u5143\u4ef6\u3001\u8bef\u5dee\u653e\u5927\u5668\u548c\u4fdd\u62a4\u529f\u80fd\u6765\u7a33\u5b9a\u8f93\u51fa\u7535\u538b\uff0c\u5176\u7279\u70b9\u662f\u91c7\u7528\u4f4e\u538b\u5dee\u7535\u538b\u8bbe\u8ba1<\/li>\n<li><strong>\u4e3b\u8981\u53c2\u6570<\/strong>\uff1a\u538b\u5dee\u7535\u538b\u3001PSRR\u3001\u7ebf\u6027\u8c03\u6574\u7387\u548c\u8d1f\u8f7d\u8c03\u6574\u7387\u3001\u53d1\u70ed\u548c\u6548\u7387\u3001\u8d1f\u8f7d\u54cd\u5e94\u7b49\u662f\u9009\u578b\u65f6\u7684\u91cd\u8981\u53c2\u6570<\/li>\n<li><strong>\u6bd4\u8f83<\/strong>\uff1a\u4e0e\u5f00\u5173\u7a33\u538b\u5668\u76f8\u6bd4\u566a\u58f0\u66f4\u5c11\uff0c\u4e0e\u4f20\u7edf\u7ebf\u6027\u7a33\u538b\u5668\u76f8\u6bd4\u53ef\u5728\u66f4\u4f4e\u538b\u5dee\u4e0b\u5de5\u4f5c<\/li>\n<li><strong>\u8bbe\u8ba1\u548c\u5b89\u88c5<\/strong>\uff1a\u5916\u56f4\u5143\u4ef6\u9009\u578b\u548c\u5e03\u5c40\u76f4\u63a5\u5173\u7cfb\u5230\u5de5\u4f5c\u7684\u7a33\u5b9a\u6027\uff0c\u540c\u65f6\u9700\u8981\u8003\u8651\u70ed\u8bbe\u8ba1\u548c\u4fdd\u62a4\u529f\u80fd<\/li>\n<\/ul>\n<h3 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