{"id":94446,"date":"2026-08-14T14:09:07","date_gmt":"2026-08-14T06:09:07","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/94446.html"},"modified":"2026-08-14T14:09:07","modified_gmt":"2026-08-14T06:09:07","slug":"ldo-%e4%bb%8e%e5%8e%9f%e7%90%86%e5%88%b0%e5%ba%94%e7%94%a8%ef%bc%88%e4%b8%80%ef%bc%89%ef%bc%9a%e4%bd%8e%e5%8e%8b%e5%b7%ae%e7%ba%bf%e6%80%a7%e7%a8%b3%e5%8e%8b%e5%99%a8%e5%88%b0%e5%ba%95%e6%98%af","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/94446.html","title":{"rendered":"LDO \u4ece\u539f\u7406\u5230\u5e94\u7528\uff08\u4e00\uff09\uff1a\u4f4e\u538b\u5dee\u7ebf\u6027\u7a33\u538b\u5668\u5230\u5e95\u662f\u600e\u4e48\u5de5\u4f5c\u7684\uff1f"},"content":{"rendered":"<h2>LDO \u4ece\u539f\u7406\u5230\u5e94\u7528&#xff08;\u4e00&#xff09;&#xff1a;\u4f4e\u538b\u5dee\u7ebf\u6027\u7a33\u538b\u5668\u5230\u5e95\u662f\u600e\u4e48\u5de5\u4f5c\u7684&#xff1f;<\/h2>\n<\/p>\n<h4>\u6587\u7ae0\u76ee\u5f55<\/h4>\n<ul>\n<li>LDO \u4ece\u539f\u7406\u5230\u5e94\u7528&#xff08;\u4e00&#xff09;&#xff1a;\u4f4e\u538b\u5dee\u7ebf\u6027\u7a33\u538b\u5668\u5230\u5e95\u662f\u600e\u4e48\u5de5\u4f5c\u7684&#xff1f;<\/li>\n<li>\n<ul>\n<li>\u4e00\u3001\u4ec0\u4e48\u662f LDO&#xff1f;<\/li>\n<li>\u4e8c\u3001LDO \u548c\u666e\u901a\u7ebf\u6027\u7a33\u538b\u5668\u6709\u4ec0\u4e48\u533a\u522b&#xff1f;<\/li>\n<li>\u4e09\u3001LDO \u7684\u57fa\u672c\u5185\u90e8\u7ed3\u6784<\/li>\n<li>\u56db\u3001LDO \u662f\u5982\u4f55\u5b9e\u73b0\u7a33\u538b\u7684&#xff1f;<\/li>\n<li>\u4e94\u3001\u8d1f\u8f7d\u7a81\u7136\u53d8\u5316\u65f6\u4f1a\u53d1\u751f\u4ec0\u4e48&#xff1f;<\/li>\n<li>\u516d\u3001Pass FET \u662f\u5e72\u4ec0\u4e48\u7684&#xff1f;<\/li>\n<li>\u4e03\u3001\u4ec0\u4e48\u662f Dropout Voltage&#xff1f;<\/li>\n<li>\u516b\u3001\u4e3a\u4ec0\u4e48 LDO \u4f1a\u53d1\u70ed&#xff1f;<\/li>\n<li>\u4e5d\u3001LDO \u7684\u6548\u7387\u4e3a\u4ec0\u4e48\u4e0d\u9ad8&#xff1f;<\/li>\n<li>\u5341\u3001\u4e3a\u4ec0\u4e48 LDO \u9700\u8981\u8f93\u5165\u3001\u8f93\u51fa\u7535\u5bb9&#xff1f;<\/li>\n<li>\u5341\u4e00\u3001LDO \u6700\u9002\u5408\u7528\u5728\u54ea\u91cc&#xff1f;<\/li>\n<li>\n<ul>\n<li>1. MCU \u7535\u6e90<\/li>\n<li>2. \u6a21\u62df\u7535\u8def<\/li>\n<li>3. \u4f20\u611f\u5668<\/li>\n<li>4. PLL\u3001\u65f6\u949f\u3001RF \u7b49\u4f4e\u566a\u58f0\u7535\u8def<\/li>\n<\/ul>\n<\/li>\n<li>\u5341\u4e8c\u3001\u603b\u7ed3<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>\u4e00\u3001\u4ec0\u4e48\u662f LDO&#xff1f;<\/h3>\n<p>LDO&#xff0c;\u5168\u79f0 Low Dropout Regulator&#xff0c;\u4e2d\u6587\u53eb\u4f4e\u538b\u5dee\u7ebf\u6027\u7a33\u538b\u5668\u3002<\/p>\n<p>\u5b83\u7684\u4f5c\u7528\u5f88\u7b80\u5355&#xff1a;<\/p>\n<p>\u5c06\u8f83\u9ad8\u7684\u76f4\u6d41\u7535\u538b\u8f6c\u6362\u6210\u7a33\u5b9a\u7684\u8f83\u4f4e\u76f4\u6d41\u7535\u538b\u3002<\/p>\n<p>\u4f8b\u5982&#xff1a;<\/p>\n<p>5V  \u2192  3.3V<br \/>\n3.3V \u2192  1.8V<br \/>\n1.8V \u2192  1.2V<\/p>\n<p>\u5728\u5d4c\u5165\u5f0f\u7cfb\u7edf\u4e2d&#xff0c;LDO \u7ecf\u5e38\u7528\u4e8e\u7ed9 MCU\u3001\u4f20\u611f\u5668\u3001ADC\u3001DAC\u3001\u901a\u4fe1\u82af\u7247\u4ee5\u53ca\u6a21\u62df\u7535\u8def\u4f9b\u7535\u3002<\/p>\n<p>\u4e00\u4e2a\u5178\u578b\u7684\u7535\u6e90\u7ed3\u6784\u53ef\u80fd\u662f&#xff1a;<\/p>\n<p>24V<br \/>\n \u2502<br \/>\n \u25bc<br \/>\nDC\/DC<br \/>\n \u2502<br \/>\n \u25bc<br \/>\n 5V<br \/>\n \u2502<br \/>\n \u25bc<br \/>\n LDO<br \/>\n \u2502<br \/>\n \u25bc<br \/>\n3.3V<br \/>\n \u2502<br \/>\n \u251c\u2500\u2500 MCU<br \/>\n \u251c\u2500\u2500 Sensor<br \/>\n \u2514\u2500\u2500 ADC<\/p>\n<p>LDO \u672c\u8d28\u4e0a\u4ecd\u7136\u5c5e\u4e8e\u7ebf\u6027\u7a33\u538b\u5668&#xff0c;\u5b83\u6700\u5927\u7684\u7279\u70b9\u662f&#xff1a;\u8f93\u5165\u7535\u538b\u53ef\u4ee5\u6bd4\u8f83\u63a5\u8fd1\u8f93\u51fa\u7535\u538b\u65f6&#xff0c;\u4ecd\u7136\u80fd\u591f\u7ef4\u6301\u7a33\u5b9a\u8f93\u51fa\u3002<\/p>\n<hr \/>\n<h3>\u4e8c\u3001LDO \u548c\u666e\u901a\u7ebf\u6027\u7a33\u538b\u5668\u6709\u4ec0\u4e48\u533a\u522b&#xff1f;<\/h3>\n<p>\u4f20\u7edf\u7ebf\u6027\u7a33\u538b\u5668&#xff0c;\u4f8b\u5982\u7ecf\u5178\u7684 7805&#xff0c;\u4e5f\u53ef\u4ee5\u5b8c\u6210&#xff1a;<\/p>\n<p>12V \u2192 5V<\/p>\n<p>\u4f46\u662f\u5b83\u9700\u8981\u8f93\u5165\u7535\u538b\u660e\u663e\u9ad8\u4e8e\u8f93\u51fa\u7535\u538b\u3002<\/p>\n<p>LDO \u5219\u53ef\u4ee5\u5c06\u8fd9\u4e2a\u538b\u5dee\u505a\u5f97\u5f88\u5c0f\u3002<\/p>\n<p>\u4f8b\u5982\u4e00\u4e2a LDO&#xff1a;<\/p>\n<p>VOUT &#061; 3.3V<br \/>\nDropout &#061; 0.2V<\/p>\n<p>\u90a3\u4e48\u53ea\u8981&#xff1a;<\/p>\n<p>VIN \u2265 3.5V<\/p>\n<p>\u7406\u8bba\u4e0a\u5c31\u53ef\u4ee5\u7ef4\u6301 3.3V \u8f93\u51fa\u3002<\/p>\n<p>\u8fd9\u5c31\u662f Low Dropout&#xff0c;\u4e5f\u5c31\u662f\u4f4e\u538b\u5dee\u3002<\/p>\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f&#xff0c;Dropout \u5e76\u4e0d\u662f\u4e00\u4e2a\u56fa\u5b9a\u4e0d\u53d8\u7684\u503c&#xff0c;\u5b83\u901a\u5e38\u4e0e\u8f93\u51fa\u7535\u6d41\u3001\u6e29\u5ea6\u4ee5\u53ca\u82af\u7247\u672c\u8eab\u6709\u5173\u3002<\/p>\n<hr \/>\n<h3>\u4e09\u3001LDO \u7684\u57fa\u672c\u5185\u90e8\u7ed3\u6784<\/h3>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260814060903-6a7eb0ff7cade.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u4e00\u4e2a\u5178\u578b LDO \u53ef\u4ee5\u7b80\u5316\u4e3a&#xff1a;<\/p>\n<p>                VIN<br \/>\n                 \u2502<br \/>\n                 \u25bc<br \/>\n           \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510<br \/>\n           \u2502 \u529f\u7387\u7ba1   \u2502<br \/>\n           \u2502 Pass FET \u2502<br \/>\n           \u2514\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2518<br \/>\n                \u25bc<br \/>\n               VOUT<br \/>\n                \u2502<br \/>\n               LOAD<br \/>\n                \u2502<br \/>\n               GND<\/p>\n<p>       VOUT<br \/>\n         \u2502<br \/>\n         \u25bc<br \/>\n      \u53cd\u9988\u5206\u538b<br \/>\n         \u2502<br \/>\n         \u25bc<br \/>\n     \u8bef\u5dee\u653e\u5927\u5668 \u2190\u2500\u2500 VREF<br \/>\n         \u2502<br \/>\n         \u2502 \u63a7\u5236<br \/>\n         \u25bc<br \/>\n      Pass FET<\/p>\n<p>LDO \u7684\u6838\u5fc3\u4e3b\u8981\u5305\u62ec\u56db\u90e8\u5206&#xff1a;<\/p>\n<li>\u53c2\u8003\u7535\u538b VREF<\/li>\n<li>\u8bef\u5dee\u653e\u5927\u5668<\/li>\n<li>\u529f\u7387\u8c03\u6574\u7ba1 Pass FET<\/li>\n<li>\u53cd\u9988\u7535\u963b\u7f51\u7edc<\/li>\n<p>\u5176\u4e2d\u6700\u5173\u952e\u7684\u662f&#xff1a;<\/p>\n<p>\u8d1f\u53cd\u9988\u3002<\/p>\n<hr \/>\n<h3>\u56db\u3001LDO \u662f\u5982\u4f55\u5b9e\u73b0\u7a33\u538b\u7684&#xff1f;<\/h3>\n<p>\u5047\u8bbe\u4e00\u4e2a LDO \u8981\u8f93\u51fa&#xff1a;<\/p>\n<p>VOUT &#061; 3.3V<\/p>\n<p>\u82af\u7247\u5185\u90e8\u5b58\u5728\u4e00\u4e2a\u7a33\u5b9a\u7684\u53c2\u8003\u7535\u538b&#xff0c;\u4f8b\u5982&#xff1a;<\/p>\n<p>VREF &#061; 1.2V<\/p>\n<p>\u8f93\u51fa\u7aef\u901a\u8fc7\u4e24\u4e2a\u7535\u963b\u8fdb\u884c\u5206\u538b&#xff1a;<\/p>\n<p>             VOUT<br \/>\n               \u2502<br \/>\n              R1<br \/>\n               \u2502<br \/>\n               \u251c\u2500\u2500\u2500\u2500\u2192 FB<br \/>\n               \u2502<br \/>\n              R2<br \/>\n               \u2502<br \/>\n              GND<\/p>\n<p>\u53cd\u9988\u7535\u538b&#xff1a;<\/p>\n<p>VFB &#061; VOUT \u00d7 R2 \/ (R1 &#043; R2)<\/p>\n<p>\u8bef\u5dee\u653e\u5927\u5668\u4e0d\u65ad\u6bd4\u8f83&#xff1a;<\/p>\n<p>VFB<br \/>\n \u2502<br \/>\n \u251c\u2500\u2500\u2500\u2500\u2192 \u8bef\u5dee\u653e\u5927\u5668<br \/>\n \u2502<br \/>\nVREF<\/p>\n<p>\u5f53&#xff1a;<\/p>\n<p>VFB &#061; VREF<\/p>\n<p>\u7cfb\u7edf\u8fbe\u5230\u7a33\u5b9a\u72b6\u6001\u3002<\/p>\n<p>\u5bf9\u4e8e\u5e38\u89c1\u7684\u53ef\u8c03 LDO&#xff1a;<\/p>\n<p>VOUT &#061; VREF \u00d7 (1 &#043; R1\/R2)<\/p>\n<p>\u56e0\u6b64\u4fee\u6539\u53cd\u9988\u7535\u963b&#xff0c;\u5c31\u53ef\u4ee5\u6539\u53d8\u8f93\u51fa\u7535\u538b\u3002<\/p>\n<hr \/>\n<h3>\u4e94\u3001\u8d1f\u8f7d\u7a81\u7136\u53d8\u5316\u65f6\u4f1a\u53d1\u751f\u4ec0\u4e48&#xff1f;<\/h3>\n<p>\u5047\u8bbe LDO \u8f93\u51fa 3.3V&#xff0c;\u539f\u6765\u7684\u8d1f\u8f7d\u7535\u6d41\u4e3a 100mA\u3002<\/p>\n<p>\u7a81\u7136\u53d8\u6210&#xff1a;<\/p>\n<p>500mA<\/p>\n<p>\u7531\u4e8e\u8d1f\u8f7d\u7535\u6d41\u7a81\u7136\u589e\u52a0&#xff0c;\u8f93\u51fa\u7535\u538b\u4f1a\u51fa\u73b0\u77ac\u95f4\u4e0b\u964d\u3002<\/p>\n<p>\u6574\u4e2a\u8fc7\u7a0b\u5927\u81f4\u662f&#xff1a;<\/p>\n<p>\u8d1f\u8f7d\u7535\u6d41\u589e\u52a0<br \/>\n      \u2193<br \/>\nVOUT\u4e0b\u964d<br \/>\n      \u2193<br \/>\nVFB\u4e0b\u964d<br \/>\n      \u2193<br \/>\n\u8bef\u5dee\u653e\u5927\u5668\u68c0\u6d4b\u5230\u8bef\u5dee<br \/>\n      \u2193<br \/>\n\u8c03\u6574Pass FET<br \/>\n      \u2193<br \/>\n\u8f93\u51fa\u7535\u6d41\u589e\u52a0<br \/>\n      \u2193<br \/>\nVOUT\u6062\u590d<\/p>\n<p>\u56e0\u6b64 LDO \u5e76\u4e0d\u662f\u7b80\u5355\u5730\u201c\u628a\u7535\u538b\u538b\u4f4e\u201d\u3002<\/p>\n<p>\u5b83\u5b9e\u9645\u4e0a\u662f\u901a\u8fc7\u4e00\u4e2a\u95ed\u73af\u63a7\u5236\u7cfb\u7edf&#xff0c;\u4e0d\u65ad\u68c0\u6d4b\u8f93\u51fa\u7535\u538b\u5e76\u8c03\u6574\u529f\u7387\u7ba1\u3002<\/p>\n<hr \/>\n<h3>\u516d\u3001Pass FET \u662f\u5e72\u4ec0\u4e48\u7684&#xff1f;<\/h3>\n<p>Pass FET&#xff0c;\u4e5f\u5c31\u662f\u529f\u7387\u8c03\u6574\u7ba1&#xff0c;\u662f LDO \u4e2d\u975e\u5e38\u91cd\u8981\u7684\u5668\u4ef6\u3002<\/p>\n<p>\u53ef\u4ee5\u628a\u5b83\u7b80\u5355\u7406\u89e3\u6210\u4e00\u4e2a&#xff1a;<\/p>\n<p>\u7531\u8bef\u5dee\u653e\u5927\u5668\u63a7\u5236\u7684\u53ef\u53d8\u7535\u963b\/\u7535\u5b50\u9600\u95e8\u3002<\/p>\n<p>\u4f8b\u5982&#xff1a;<\/p>\n<p>VIN<br \/>\n \u2502<br \/>\n \u25bc<br \/>\n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510<br \/>\n\u2502 Pass  \u2502<br \/>\n\u2502  FET  \u2502 \u2190 \u63a7\u5236<br \/>\n\u2514\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2518<br \/>\n    \u2502<br \/>\n    \u25bc<br \/>\n   VOUT<\/p>\n<p>\u5f53\u8f93\u51fa\u7535\u538b\u504f\u4f4e\u65f6&#xff0c;\u8bef\u5dee\u653e\u5927\u5668\u4f1a\u8ba9 Pass FET \u63d0\u4f9b\u66f4\u591a\u7535\u6d41\u3002<\/p>\n<p>\u5f53\u8f93\u51fa\u7535\u538b\u504f\u9ad8\u65f6&#xff0c;\u5219\u51cf\u5c11\u5bfc\u901a\u7a0b\u5ea6\u3002<\/p>\n<p>\u73b0\u4ee3 LDO \u4e2d\u5e38\u89c1\u7684 Pass FET \u5305\u62ec PMOS \u548c NMOS \u7b49\u7ed3\u6784\u3002<\/p>\n<hr \/>\n<h3>\u4e03\u3001\u4ec0\u4e48\u662f Dropout Voltage&#xff1f;<\/h3>\n<p>Dropout Voltage&#xff0c;\u7b80\u79f0 VDO&#xff0c;\u4e2d\u6587\u53eb\u538b\u5dee\u3002<\/p>\n<p>\u53ef\u4ee5\u7b80\u5355\u7406\u89e3\u4e3a&#xff1a;<\/p>\n<p>LDO \u4fdd\u6301\u6b63\u5e38\u7a33\u538b\u6240\u9700\u8981\u7684\u6700\u5c0f\u8f93\u5165\u8f93\u51fa\u7535\u538b\u5dee\u3002<\/p>\n<p>\u4f8b\u5982&#xff1a;<\/p>\n<p>VOUT &#061; 3.3V<br \/>\nVDO &#061; 200mV<\/p>\n<p>\u90a3\u4e48&#xff1a;<\/p>\n<p>VIN \u2265 3.5V<\/p>\n<p>\u624d\u80fd\u6b63\u5e38\u7ef4\u6301 3.3V\u3002<\/p>\n<p>\u5982\u679c\u8f93\u5165\u7ee7\u7eed\u4e0b\u964d&#xff1a;<\/p>\n<p>VIN &#061; 3.4V<\/p>\n<p>\u90a3\u4e48&#xff1a;<\/p>\n<p>VIN &#8211; VOUT &#061; 100mV<\/p>\n<p>\u5df2\u7ecf\u5c0f\u4e8e\u89c4\u5b9a\u7684 Dropout Voltage\u3002<\/p>\n<p>\u6b64\u65f6 LDO \u4f1a\u9010\u6e10\u5931\u53bb\u7a33\u538b\u80fd\u529b&#xff1a;<\/p>\n<p>VIN\u4e0b\u964d<br \/>\n   \u2193<br \/>\n\u8fdb\u5165Dropout\u533a\u57df<br \/>\n   \u2193<br \/>\nVOUT\u5f00\u59cb\u4e0b\u964d<\/p>\n<p>\u6240\u4ee5\u5728\u8bbe\u8ba1\u7535\u6e90\u65f6&#xff0c;\u4e00\u5b9a\u8981\u4fdd\u8bc1\u8f93\u5165\u7535\u538b\u5728\u6700\u5dee\u60c5\u51b5\u4e0b\u4ecd\u7136\u6ee1\u8db3&#xff1a;<\/p>\n<p>VIN(min) &gt; VOUT &#043; VDO<\/p>\n<hr \/>\n<h3>\u516b\u3001\u4e3a\u4ec0\u4e48 LDO \u4f1a\u53d1\u70ed&#xff1f;<\/h3>\n<p>\u8fd9\u662f LDO \u6700\u660e\u663e\u7684\u7f3a\u70b9\u3002<\/p>\n<p>LDO \u7684\u529f\u7387\u635f\u8017\u8fd1\u4f3c\u4e3a&#xff1a;<\/p>\n<p>PLOSS &#061; (VIN &#8211; VOUT) \u00d7 IOUT<\/p>\n<p>\u4f8b\u5982&#xff1a;<\/p>\n<p>VIN  &#061; 5V<br \/>\nVOUT &#061; 3.3V<br \/>\nIOUT &#061; 1A<\/p>\n<p>\u90a3\u4e48&#xff1a;<\/p>\n<p>PLOSS &#061; (5 &#8211; 3.3) \u00d7 1<br \/>\n      &#061; 1.7W<\/p>\n<p>\u8fd9 1.7W \u57fa\u672c\u90fd\u4f1a\u53d8\u6210\u70ed\u91cf\u3002<\/p>\n<p>\u5982\u679c\u662f&#xff1a;<\/p>\n<p>12V \u2192 3.3V<br \/>\n1A<\/p>\n<p>\u90a3\u4e48&#xff1a;<\/p>\n<p>PLOSS &#061; (12 &#8211; 3.3) \u00d7 1<br \/>\n      &#061; 8.7W<\/p>\n<p>\u5bf9\u4e8e\u666e\u901a\u5c0f\u5c01\u88c5 LDO \u6765\u8bf4&#xff0c;\u8fd9\u6837\u7684\u529f\u8017\u901a\u5e38\u662f\u65e0\u6cd5\u63a5\u53d7\u7684\u3002<\/p>\n<p>\u56e0\u6b64\u5927\u538b\u5dee\u3001\u5927\u7535\u6d41\u5e94\u7528\u4e00\u822c\u91c7\u7528&#xff1a;<\/p>\n<p>\u9ad8\u538b<br \/>\n \u2502<br \/>\n \u25bc<br \/>\nDC\/DC<br \/>\n \u2502<br \/>\n \u25bc<br \/>\n\u8f83\u4f4e\u7535\u538b<br \/>\n \u2502<br \/>\n \u25bc<br \/>\nLDO<br \/>\n \u2502<br \/>\n \u25bc<br \/>\n\u4f4e\u566a\u58f0\u7535\u6e90<\/p>\n<p>\u800c\u4e0d\u662f\u76f4\u63a5&#xff1a;<\/p>\n<p>\u9ad8\u538b \u2192 LDO \u2192 \u4f4e\u538b<\/p>\n<hr \/>\n<h3>\u4e5d\u3001LDO \u7684\u6548\u7387\u4e3a\u4ec0\u4e48\u4e0d\u9ad8&#xff1f;<\/h3>\n<p>\u5ffd\u7565\u9759\u6001\u7535\u6d41\u65f6&#xff0c;LDO \u6548\u7387\u53ef\u4ee5\u8fd1\u4f3c\u8ba1\u7b97&#xff1a;<\/p>\n<p>\u03b7 \u2248 VOUT \/ VIN<\/p>\n<p>\u4f8b\u5982&#xff1a;<\/p>\n<p>VIN  &#061; 5V<br \/>\nVOUT &#061; 3.3V<\/p>\n<p>\u5219&#xff1a;<\/p>\n<p>\u03b7 \u2248 3.3 \/ 5<br \/>\n  \u2248 66%<\/p>\n<p>\u5982\u679c&#xff1a;<\/p>\n<p>VIN &#061; 12V<br \/>\nVOUT &#061; 3.3V<\/p>\n<p>\u5219&#xff1a;<\/p>\n<p>\u03b7 \u2248 27.5%<\/p>\n<p>\u56e0\u6b64 LDO \u5e76\u4e0d\u662f\u4e3a\u4e86\u8ffd\u6c42\u9ad8\u6548\u7387\u800c\u5b58\u5728\u7684\u3002<\/p>\n<p>\u5b83\u771f\u6b63\u7684\u4f18\u52bf\u5728\u4e8e&#xff1a;<\/p>\n<ul>\n<li>\u7535\u8def\u7b80\u5355<\/li>\n<li>\u566a\u58f0\u4f4e<\/li>\n<li>\u7eb9\u6ce2\u5c0f<\/li>\n<li>PSRR \u8f83\u9ad8<\/li>\n<li>\u54cd\u5e94\u901f\u5ea6\u5feb<\/li>\n<li>\u5916\u56f4\u5668\u4ef6\u5c11<\/li>\n<li>\u6210\u672c\u4f4e<\/li>\n<\/ul>\n<hr \/>\n<h3>\u5341\u3001\u4e3a\u4ec0\u4e48 LDO \u9700\u8981\u8f93\u5165\u3001\u8f93\u51fa\u7535\u5bb9&#xff1f;<\/h3>\n<p>\u5178\u578b LDO \u7535\u8def&#xff1a;<\/p>\n<p>             LDO<br \/>\n              \u2502<br \/>\nVIN \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2192\u2502\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2192 VOUT<br \/>\n \u2502            \u2502            \u2502<br \/>\nCin           \u2502           Cout<br \/>\n \u2502            \u2502            \u2502<br \/>\nGND \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2534\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500GND<\/p>\n<p>\u8f93\u5165\u7535\u5bb9 Cin \u4e3b\u8981\u7528\u4e8e&#xff1a;<\/p>\n<ul>\n<li>\u964d\u4f4e\u8f93\u5165\u7aef\u963b\u6297<\/li>\n<li>\u6291\u5236\u8f93\u5165\u7535\u6e90\u6270\u52a8<\/li>\n<li>\u63d0\u4f9b\u77ac\u6001\u7535\u6d41<\/li>\n<\/ul>\n<p>\u8f93\u51fa\u7535\u5bb9 Cout \u5219\u975e\u5e38\u91cd\u8981&#xff0c;\u5b83\u53ef\u80fd\u76f4\u63a5\u5f71\u54cd&#xff1a;<\/p>\n<ul>\n<li>\u73af\u8def\u7a33\u5b9a\u6027<\/li>\n<li>\u8f93\u51fa\u7eb9\u6ce2<\/li>\n<li>\u77ac\u6001\u54cd\u5e94<\/li>\n<li>\u542f\u52a8\u7279\u6027<\/li>\n<\/ul>\n<p>\u56e0\u6b64\u8bbe\u8ba1 LDO \u65f6\u4e0d\u80fd\u7b80\u5355\u8ba4\u4e3a&#xff1a;<\/p>\n<p>\u201c\u53ea\u8981\u653e\u4e00\u4e2a\u7535\u5bb9\u5c31\u884c\u3002\u201d<\/p>\n<p>\u5fc5\u987b\u6309\u7167\u6570\u636e\u624b\u518c\u8981\u6c42\u9009\u62e9\u7535\u5bb9\u5bb9\u91cf\u3001\u7c7b\u578b\u4ee5\u53ca ESR\u3002<\/p>\n<hr \/>\n<h3>\u5341\u4e00\u3001LDO \u6700\u9002\u5408\u7528\u5728\u54ea\u91cc&#xff1f;<\/h3>\n<p>LDO \u7279\u522b\u9002\u5408&#xff1a;<\/p>\n<h4>1. MCU \u7535\u6e90<\/h4>\n<p>5V \u2192 LDO \u2192 3.3V \u2192 MCU<\/p>\n<h4>2. \u6a21\u62df\u7535\u8def<\/h4>\n<p>5V \u2192 LDO \u2192 3.3V_A \u2192 ADC<\/p>\n<h4>3. \u4f20\u611f\u5668<\/h4>\n<p>5V \u2192 LDO \u2192 3.3V \u2192 Sensor<\/p>\n<h4>4. PLL\u3001\u65f6\u949f\u3001RF \u7b49\u4f4e\u566a\u58f0\u7535\u8def<\/h4>\n<p>\u8fd9\u4e9b\u7535\u8def\u5bf9\u7535\u6e90\u566a\u58f0\u6bd4\u8f83\u654f\u611f&#xff0c;\u56e0\u6b64\u7ecf\u5e38\u4f7f\u7528\u4f4e\u566a\u58f0 LDO\u3002<\/p>\n<hr \/>\n<h3>\u5341\u4e8c\u3001\u603b\u7ed3<\/h3>\n<p>LDO \u7684\u5de5\u4f5c\u539f\u7406\u53ef\u4ee5\u6d53\u7f29\u6210\u4e00\u53e5\u8bdd&#xff1a;<\/p>\n<p>\u901a\u8fc7\u53c2\u8003\u7535\u538b\u3001\u8bef\u5dee\u653e\u5927\u5668\u3001\u53cd\u9988\u7f51\u7edc\u548c Pass FET \u6784\u6210\u95ed\u73af\u8d1f\u53cd\u9988&#xff0c;\u4f7f\u8f93\u51fa\u7535\u538b\u7a33\u5b9a\u5728\u76ee\u6807\u503c\u3002<\/p>\n<p>\u7406\u89e3 LDO \u6700\u91cd\u8981\u7684\u51e0\u4e2a\u6982\u5ff5&#xff1a;<\/p>\n<p>              LDO<br \/>\n               \u2502<br \/>\n     \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u253c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510<br \/>\n     \u2193         \u2193         \u2193<br \/>\n  Dropout     PSRR      Noise<br \/>\n     \u2502         \u2502         \u2502<br \/>\n  \u538b\u5dee\u80fd\u529b    \u6297\u7eb9\u6ce2     \u8f93\u51fa\u566a\u58f0<\/p>\n<p>\u540c\u65f6\u4e00\u5b9a\u8981\u8bb0\u4f4f&#xff1a;<\/p>\n<p>PLOSS &#061; 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