{"id":5177,"date":"2026-04-24T10:00:00","date_gmt":"2026-04-24T01:00:00","guid":{"rendered":"https:\/\/www.ramxeed.com\/jp\/?post_type=column&p=5177"},"modified":"2026-04-23T11:30:01","modified_gmt":"2026-04-23T02:30:01","slug":"ldo-design-for-data-retention-voltage","status":"publish","type":"column","link":"https:\/\/www.ramxeed.com\/jp\/tech-column\/ldo-design-for-data-retention-voltage\/","title":{"rendered":"\u30c7\u30fc\u30bf\u4fdd\u6301\u96fb\u6e90\u96fb\u5727\u3068LDO\u8a2d\u8a08\uff1a\u4e0d\u5b89\u5b9a\u306a\u6b8b\u96fb\u5727\u4e0b\u3067\u4fe1\u983c\u6027\u3092\u4fdd\u3064\u65b9\u6cd5"},"content":{"rendered":"\n

SRAM\u306e\u30c7\u30fc\u30bf\u4fdd\u6301\u96fb\u5727\u3068LDO\u8a2d\u8a08\u306e\u8ab2\u984c\u3092\u89e3\u8aac\u3057\u307e\u3059\u3002\u4f4e\u96fb\u5727\u74b0\u5883\u3067\u306e\u30a8\u30e9\u30fc\u8981\u56e0\u3084\u3001\u6a5f\u5668\u306e\u4fe1\u983c\u6027\u3092\u5b88\u308b\u5bfe\u7b56\u3092\u6574\u7406\u3057\u307e\u3057\u305f\u3002\u307e\u305f\u3001\u89e3\u6c7a\u7b56\u3068\u3057\u3066\u4e0d\u63ee\u767a\u6027\u30e1\u30e2\u30ea\u3092\u6d3b\u7528\u3059\u308b\u9078\u629e\u80a2\u3082\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n\n\n\n

SRAM\u306e\u30c7\u30fc\u30bf\u4fdd\u6301\u96fb\u6e90\u96fb\u5727\uff08VDR\uff09\u3068LDO\u8a2d\u8a08\u306e\u95a2\u4fc2<\/strong><\/h2>\n\n\n\n

SRAM\u306e\u30c7\u30fc\u30bf\u4fdd\u6301\u96fb\u6e90\u96fb\u5727\u306f\u3001\u63ee\u767a\u6027\u30e1\u30e2\u30ea\u304c\u96fb\u6e90\u4f9b\u7d66\u4e2d\u306b\u30c7\u30fc\u30bf\u3092\u5b89\u5168\u306b\u4fdd\u6301\u3059\u308b\u305f\u3081\u306b\u5fc5\u8981\u306a\u6700\u4f4e\u96fb\u5727\u6761\u4ef6\u3092\u793a\u3059\u91cd\u8981\u306a\u8a2d\u8a08\u6307\u6a19\u3067\u3059\u3002LDO\u306f\u3053\u306e\u96fb\u5727\u3092\u5b89\u5b9a\u7684\u306b\u4f9b\u7d66\u3059\u308b\u5f79\u5272\u3092\u62c5\u3044\u3001\u7279\u306b\u96fb\u6e90\u5909\u52d5\u6642\u306b\u304a\u3044\u3066\u4fdd\u6301\u96fb\u5727\u3092\u4e0b\u56de\u3089\u306a\u3044\u5236\u5fa1\u304c\u6c42\u3081\u3089\u308c\u307e\u3059\u3002\u4e21\u8005\u306f\u5bc6\u63a5\u306b\u95a2\u9023\u3057\u3001\u96fb\u6e90\u8a2d\u8a08\u5168\u4f53\u306e\u4fe1\u983c\u6027\u3092\u5de6\u53f3\u3057\u307e\u3059\u3002<\/p>\n\n\n\n

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SRAM\u306b\u304a\u3051\u308b\u96fb\u5727\u30de\u30fc\u30b8\u30f3\u306e\u8003\u3048\u65b9<\/strong><\/h3>\n\n\n\n

SRAM\u306e\u8a2d\u8a08\u306b\u304a\u3044\u3066\u306f\u3001\u7406\u60f3\u7684\u306a\u4fdd\u6301\u96fb\u5727\u3060\u3051\u3067\u306a\u304f\u3001\u6700\u60aa\u6761\u4ef6\u3092\u60f3\u5b9a\u3057\u305f\u96fb\u5727\u30de\u30fc\u30b8\u30f3\u306e\u78ba\u4fdd\u304c\u4e0d\u53ef\u6b20\u3067\u3059\u3002\u30d7\u30ed\u30bb\u30b9\u3070\u3089\u3064\u304d\u3084\u6e29\u5ea6\u5909\u52d5\u3001\u96fb\u6e90\u30ce\u30a4\u30ba\u306a\u3069\u306b\u3088\u308a\u5b9f\u969b\u306e\u52d5\u4f5c\u96fb\u5727\u306f\u5909\u52d5\u3059\u308b\u305f\u3081\u3001\u5358\u7d14\u306a\u4ed5\u69d8\u5024\u3067\u306f\u306a\u304f\u7d71\u8a08\u7684\u306a\u5206\u5e03\u3092\u8003\u616e\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u3055\u3089\u306b\u3001LDO\u306e\u51fa\u529b\u8aa4\u5dee\u3084\u6025\u6fc0\u306a\u8ca0\u8377\u5909\u52d5\u306b\u3088\u308b\u77ac\u9593\u7684\u306a\u96fb\u5727\u30c7\u30a3\u30c3\u30d7\u3082\u52a0\u5473\u3059\u308b\u3053\u3068\u3067\u3001\u5b9f\u74b0\u5883\u306b\u304a\u3051\u308b\u5b89\u5168\u52d5\u4f5c\u9818\u57df\u3092\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n

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LDO\u8a2d\u8a08\u306b\u304a\u3051\u308b\u4f4e\u96fb\u5727\u30fb\u6b8b\u96fb\u5727\u52d5\u4f5c\u306e\u8ab2\u984c<\/strong><\/h2>\n\n\n\n

LDO\u306f\u5165\u529b\u96fb\u5727\u304c\u5341\u5206\u306b\u78ba\u4fdd\u3055\u308c\u3066\u3044\u308b\u72b6\u614b\u3067\u306f\u5b89\u5b9a\u3057\u305f\u51fa\u529b\u3092\u7dad\u6301\u3067\u304d\u307e\u3059\u304c\u3001\u6b8b\u96fb\u5727\u74b0\u5883\u3067\u306f\u305d\u306e\u6027\u80fd\u304c\u5927\u304d\u304f\u5236\u7d04\u3055\u308c\u307e\u3059\u3002\u7279\u306b\u5165\u529b\u96fb\u5727\u306e\u4f4e\u4e0b\u306b\u4f34\u3044\u30c9\u30ed\u30c3\u30d7\u30a2\u30a6\u30c8\u9818\u57df\u306b\u5165\u308b\u3068\u3001\u51fa\u529b\u5236\u5fa1\u6027\u304c\u4f4e\u4e0b\u3057\u3001\u4fdd\u6301\u96fb\u5727\u306e\u7dad\u6301\u304c\u56f0\u96e3\u306b\u306a\u308a\u307e\u3059\u3002\u3053\u3046\u3057\u305f\u6761\u4ef6\u4e0b\u3067\u306e\u6319\u52d5\u7406\u89e3\u304c\u4fe1\u983c\u6027\u8a2d\u8a08\u306e\u9375\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n

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LDO\u306b\u304a\u3051\u308b\u30c9\u30ed\u30c3\u30d7\u30a2\u30a6\u30c8\u96fb\u5727\u306f\u3001\u5165\u529b\u96fb\u5727\u3068\u51fa\u529b\u96fb\u5727\u306e\u6700\u5c0f\u5dee\u5206\u3092\u898f\u5b9a\u3059\u308b\u91cd\u8981\u306a\u30d1\u30e9\u30e1\u30fc\u30bf\u3067\u3042\u308a\u3001\u6b8b\u96fb\u5727\u74b0\u5883\u3067\u306f\u3053\u306e\u5236\u7d04\u304c\u76f4\u63a5\u7684\u306b\u5f71\u97ff\u3057\u307e\u3059\u3002\u5165\u529b\u96fb\u5727\u304c\u4f4e\u4e0b\u3057\u30d8\u30c3\u30c9\u30eb\u30fc\u30e0\u304c\u4e0d\u8db3\u3059\u308b\u3068\u3001\u30d1\u30b9\u7d20\u5b50\u306f\u5b8c\u5168\u306b\u30aa\u30f3\u72b6\u614b\u3068\u306a\u308a\u3001\u5236\u5fa1\u30eb\u30fc\u30d7\u304c\u6a5f\u80fd\u3057\u306a\u304f\u306a\u308a\u307e\u3059\u3002\u3053\u306e\u7d50\u679c\u3001\u51fa\u529b\u96fb\u5727\u306f\u5165\u529b\u96fb\u5727\u306b\u8ffd\u5f93\u3059\u308b\u3060\u3051\u306e\u72b6\u614b\u3068\u306a\u308a\u3001\u5b89\u5b9a\u3057\u305f\u96fb\u5727\u4f9b\u7d66\u304c\u3067\u304d\u306a\u304f\u306a\u308a\u307e\u3059\u3002\u3055\u3089\u306b\u5468\u56f2\u6e29\u5ea6\u306e\u4e0a\u6607\u306b\u3088\u308a\u30c9\u30ed\u30c3\u30d7\u30a2\u30a6\u30c8\u7279\u6027\u304c\u60aa\u5316\u3059\u308b\u3053\u3068\u3082\u3042\u308a\u3001\u8a2d\u8a08\u6642\u306b\u306f\u6700\u60aa\u6761\u4ef6\u3092\u60f3\u5b9a\u3057\u305f\u4f59\u88d5\u8a2d\u8a08\u304c\u4e0d\u53ef\u6b20\u3067\u3059\u3002<\/p>\n\n\n\n

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\u8aa4\u5dee\u30a2\u30f3\u30d7\u30fb\u30ea\u30d5\u30a1\u30ec\u30f3\u30b9\u306e\u4f4e\u96fb\u5727\u52d5\u4f5c\u9650\u754c<\/strong><\/h3>\n\n\n\n

LDO\u306e\u7cbe\u5ea6\u3092\u652f\u3048\u308b\u8aa4\u5dee\u30a2\u30f3\u30d7\u3084\u30d0\u30f3\u30c9\u30ae\u30e3\u30c3\u30d7\u30ea\u30d5\u30a1\u30ec\u30f3\u30b9\u306f\u3001\u4e00\u5b9a\u4ee5\u4e0a\u306e\u96fb\u5727\u3067\u306e\u52d5\u4f5c\u3092\u524d\u63d0\u3068\u3057\u3066\u8a2d\u8a08\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u5165\u529b\u96fb\u5727\u304c\u4f4e\u4e0b\u3059\u308b\u3068\u3001\u3053\u308c\u3089\u306e\u56de\u8def\u304c\u6b63\u5e38\u306b\u52d5\u4f5c\u3067\u304d\u306a\u304f\u306a\u308a\u3001\u51fa\u529b\u96fb\u5727\u306e\u5236\u5fa1\u7cbe\u5ea6\u304c\u6025\u6fc0\u306b\u60aa\u5316\u3057\u307e\u3059\u3002\u7279\u306b\u57fa\u6e96\u96fb\u5727\uff08\u30ea\u30d5\u30a1\u30ec\u30f3\u30b9\uff09\u304c\u4e0d\u5b89\u5b9a\u306b\u306a\u308b\u3068\u3001\u51fa\u529b\u96fb\u5727\u305d\u306e\u3082\u306e\u304c\u8a2d\u8a08\u5024\u304b\u3089\u9038\u8131\u3057\u3001\u4fdd\u6301\u96fb\u5727\u3092\u4e0b\u56de\u308b\u5371\u967a\u6027\u304c\u9ad8\u307e\u308a\u307e\u3059\u3002\u307e\u305f\u4f4e\u96fb\u5727\u6642\u306b\u306f\u30aa\u30d5\u30bb\u30c3\u30c8\u3084\u30ce\u30a4\u30ba\u306e\u5f71\u97ff\u3082\u76f8\u5bfe\u7684\u306b\u5927\u304d\u304f\u306a\u308b\u305f\u3081\u3001\u8a2d\u8a08\u6bb5\u968e\u3067\u52d5\u4f5c\u9650\u754c\u3092\u628a\u63e1\u3057\u3001\u9069\u5207\u306a\u5b89\u5168\u30de\u30fc\u30b8\u30f3\u3092\u78ba\u4fdd\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n

\u4e0d\u5b89\u5b9a\u306a\u6b8b\u96fb\u5727\u4e0b\u3067\u306e\u30c7\u30fc\u30bf\u4fdd\u6301\u30fb\u4fe1\u983c\u6027\u78ba\u4fdd\u624b\u6cd5<\/strong><\/h2>\n\n\n\n

\u6b8b\u96fb\u5727\u304c\u4e0d\u5b89\u5b9a\u306a\u74b0\u5883\u3067\u306f\u3001LDO\u5358\u4f53\u306e\u6027\u80fd\u3060\u3051\u3067\u306a\u304f\u96fb\u6e90\u30b7\u30b9\u30c6\u30e0\u5168\u4f53\u3068\u3057\u3066\u306e\u5bfe\u7b56\u304c\u6c42\u3081\u3089\u308c\u307e\u3059\u3002\u7279\u306b\u96fb\u6e90\u30c7\u30a3\u30c3\u30d7\u3084\u77ac\u65ad\u306a\u3069\u306e\u904e\u6e21\u7684\u306a\u5909\u52d5\u306b\u5bfe\u3057\u3001\u4fdd\u6301\u96fb\u5727\u3092\u4e0b\u56de\u3089\u306a\u3044\u8a2d\u8a08\u304c\u91cd\u8981\u3067\u3059\u3002\u8907\u6570\u306e\u8a2d\u8a08\u624b\u6cd5\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u5b9f\u74b0\u5883\u306b\u304a\u3051\u308b\u30c7\u30fc\u30bf\u4fdd\u6301\u4fe1\u983c\u6027\u3092\u78ba\u4fdd\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n

\u96fb\u6e90\u30c7\u30a3\u30c3\u30d7\u30fb\u77ac\u65ad\u6642\u306e\u52d5\u4f5c\u4fdd\u8a3c\u8a2d\u8a08<\/strong><\/h3>\n\n\n\n

\u96fb\u6e90\u30c7\u30a3\u30c3\u30d7\u3084\u77ac\u65ad\u304c\u767a\u751f\u3057\u305f\u5834\u5408\u3067\u3082\u30c7\u30fc\u30bf\u4fdd\u6301\u3092\u7dad\u6301\u3059\u308b\u305f\u3081\u306b\u306f\u3001\u96fb\u5727\u964d\u4e0b\uff08\u653e\u96fb\uff09\u306e\u901f\u5ea6\u3092\u5236\u5fa1\u3059\u308b\u8a2d\u8a08\u304c\u91cd\u8981\u3067\u3059\u3002\u5177\u4f53\u7684\u306b\u306f\u3001\u5165\u529b\u5074\u304a\u3088\u3073\u51fa\u529b\u5074\u306b\u5341\u5206\u306a\u5bb9\u91cf\u3092\u6301\u3064\u30ad\u30e3\u30d1\u30b7\u30bf\u3092\u914d\u7f6e\u3057\u3001\u6642\u5b9a\u6570\u3092\u7a3c\u3050\u3053\u3068\u3067\u4fdd\u6301\u96fb\u5727\u3092\u4e0b\u56de\u308b\u307e\u3067\u306e\u6642\u9593\u3092\u5f15\u304d\u5ef6\u3070\u3057\u307e\u3059\u3002\u307e\u305f\u3001LDO\u306e\u904e\u6e21\u5fdc\u7b54\u7279\u6027\u3092\u8003\u616e\u3057\u3001\u6025\u5cfb\u306a\u8ca0\u8377\u5909\u52d5\u306b\u5bfe\u3057\u3066\u3082\u5b89\u5b9a\u3057\u305f\u51fa\u529b\u3092\u7dad\u6301\u3067\u304d\u308b\u69cb\u6210\u3068\u3059\u308b\u3053\u3068\u304c\u5fc5\u8981\u3067\u3059\u3002\u3055\u3089\u306b\u3001\u96fb\u6e90\u76e3\u8996\u56de\u8def\u3068\u9023\u643a\u3057\u3001\u5371\u967a\u306a\u96fb\u5727\u9818\u57df\u306b\u5165\u308b\u524d\u306b\u30de\u30a4\u30b3\u30f3\u3092\u30b9\u30ea\u30fc\u30d7\u3055\u305b\u308b\u8a2d\u8a08\u3082\u6709\u52b9\u3067\u3059\u3002<\/p>\n\n\n\n

PSRR\u30fb\u904e\u6e21\u5fdc\u7b54\u3092\u6d3b\u7528\u3057\u305f\u96fb\u5727\u5b89\u5b9a\u5316<\/strong><\/h3>\n\n\n\n

PSRR\u306f\u5165\u529b\u96fb\u6e90\u306e\u30ce\u30a4\u30ba\u3084\u30ea\u30c3\u30d7\u30eb\u304c\u51fa\u529b\u306b\u3069\u306e\u7a0b\u5ea6\u5f71\u97ff\u3059\u308b\u304b\u3092\u793a\u3059\u91cd\u8981\u306a\u6307\u6a19\u3067\u3042\u308a\u3001\u6b8b\u96fb\u5727\u74b0\u5883\u3067\u306f\u305d\u306e\u91cd\u8981\u6027\u304c\u3055\u3089\u306b\u9ad8\u307e\u308a\u307e\u3059\u3002\u9ad8\u3044PSRR\u7279\u6027\u3092\u6301\u3064LDO\u3092\u9078\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001\u5165\u529b\u96fb\u5727\u306e\u63fa\u3089\u304e\u3092\u6291\u3048\u3001\u51fa\u529b\u96fb\u5727\u306e\u5b89\u5b9a\u6027\u3092\u78ba\u4fdd\u3067\u304d\u307e\u3059\u3002\u307e\u305f\u904e\u6e21\u5fdc\u7b54\u6027\u80fd\u304c\u512a\u308c\u3066\u3044\u308bLDO\u306f\u3001\u6025\u6fc0\u306a\u8ca0\u8377\u5909\u52d5\u306b\u5bfe\u3057\u3066\u3082\u96fb\u5727\u30c7\u30a3\u30c3\u30d7\u3092\u6291\u5236\u3067\u304d\u308b\u305f\u3081\u3001\u4fdd\u6301\u96fb\u5727\u3092\u7dad\u6301\u3059\u308b\u4e0a\u3067\u6709\u52b9\u3067\u3059\u3002\u3053\u308c\u3089\u306e\u7279\u6027\u3092\u7dcf\u5408\u7684\u306b\u8a55\u4fa1\u3057\u3001\u7528\u9014\u306b\u9069\u3057\u305f\u30c7\u30d0\u30a4\u30b9\u3092\u9078\u629e\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n

\u30c7\u30ab\u30c3\u30d7\u30ea\u30f3\u30b0\u3068\u96fb\u6e90\u30b7\u30fc\u30b1\u30f3\u30b9\u8a2d\u8a08<\/strong><\/h3>\n\n\n\n

\u30c7\u30ab\u30c3\u30d7\u30ea\u30f3\u30b0\u30b3\u30f3\u30c7\u30f3\u30b5\u306e\u9069\u5207\u306a\u914d\u7f6e\u306f\u3001\u96fb\u6e90\u30e9\u30a4\u30f3\u306e\u30a4\u30f3\u30d4\u30fc\u30c0\u30f3\u30b9\u3092\u4f4e\u6e1b\u3057\u3001\u77ac\u9593\u7684\u306a\u96fb\u5727\u5909\u52d5\u3092\u5438\u53ce\u3059\u308b\u4e0a\u3067\u4e0d\u53ef\u6b20\u3067\u3059\u3002\u7279\u306b\u30e1\u30e2\u30ea\u306e\u96fb\u6e90\u30d4\u30f3\u76f4\u8fd1\u306b\u914d\u7f6e\u3059\u308b\u3053\u3068\u3067\u3001\u30ed\u30fc\u30ab\u30eb\u306a\u96fb\u5727\u5b89\u5b9a\u6027\u3092\u5411\u4e0a\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u307e\u305f\u96fb\u6e90\u30b7\u30fc\u30b1\u30f3\u30b9\u8a2d\u8a08\u306b\u3088\u308a\u3001\u5404\u30d6\u30ed\u30c3\u30af\u3078\u306e\u96fb\u5727\u4f9b\u7d66\u30bf\u30a4\u30df\u30f3\u30b0\u3092\u5236\u5fa1\u3059\u308b\u3053\u3068\u3067\u3001\u4e0d\u5b89\u5b9a\u306a\u72b6\u614b\u3067\u306e\u8aa4\u52d5\u4f5c\u3092\u9632\u3050\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002\u3053\u308c\u3089\u306e\u624b\u6cd5\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u6b8b\u96fb\u5727\u74b0\u5883\u306b\u304a\u3044\u3066\u3082\u30b7\u30b9\u30c6\u30e0\u5168\u4f53\u306e\u4fe1\u983c\u6027\u3092\u9ad8\u3044\u6c34\u6e96\u3067\u7dad\u6301\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n

\u4e0d\u63ee\u767a\u6027\u30e1\u30e2\u30ea\u5229\u7528\u306e\u53ef\u80fd\u6027\u3068FRAM\u3068\u3044\u3046\u9078\u629e\u80a2<\/strong><\/h2>\n\n\n\n

\u30c7\u30fc\u30bf\u4fdd\u6301\u4fe1\u983c\u6027\u3092\u629c\u672c\u7684\u306b\u5411\u4e0a\u3055\u305b\u308b\u306b\u306f\u3001LDO\u306b\u3088\u308b\u96fb\u5727\u7dad\u6301\u3060\u3051\u3067\u306a\u304f\u3001\u30e1\u30e2\u30ea\u30c7\u30d0\u30a4\u30b9\u305d\u306e\u3082\u306e\u306e\u9078\u5b9a\u3092\u898b\u76f4\u3059\u30a2\u30d7\u30ed\u30fc\u30c1\u3082\u6709\u52b9\u3067\u3059\u3002\u7279\u306b\u5fae\u7d30\u5316\u306b\u3088\u308b\u4f4e\u96fb\u5727\u5316\u304c\u9032\u3080\u4e2d\u3001\u5f93\u6765\u306eSRAM\uff0b\u30d0\u30c3\u30af\u30a2\u30c3\u30d7\u96fb\u6e90\u3068\u3044\u3046\u69cb\u6210\u306f\u8a2d\u8a08\u306e\u9650\u754c\u306b\u8fd1\u3065\u3044\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n

SRAM\uff0bLDO\u306b\u3088\u308b\u30c7\u30fc\u30bf\u4fdd\u6301\u8a2d\u8a08\u306e\u9650\u754c<\/strong><\/h3>\n\n\n\n

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