{"id":9745,"date":"2026-07-05T09:59:36","date_gmt":"2026-07-05T09:59:36","guid":{"rendered":"https:\/\/materialparts.com\/lm2940imp-15-nopb\/"},"modified":"2026-07-05T09:59:36","modified_gmt":"2026-07-05T09:59:36","slug":"lm2940imp-15-nopb","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/lm2940imp-15-nopb\/","title":{"rendered":"LM2940IMP-15\/NOPB"},"content":{"rendered":"<h2>\u4ea7\u54c1\u6982\u89c8<\/h2>\n<p>The LM2940IMP-15\/NOPB from Texas Instruments is a 1A low-dropout (LDO) voltage regulator with a fixed 15V output. It features a maximum dropout voltage of 0.5V at 1A, reverse battery protection, and 60V input transient capability. The SOT-223 package provides efficient thermal performance for automotive and industrial power supply applications.<\/p>\n<h2>\u4e3b\u8981\u89c4\u683c<\/h2>\n<ul>\n<li>Type: LDO Voltage Regulator (fixed output)<\/li>\n<li>Output Voltage: 15V (fixed)<\/li>\n<li>Max Output Current: 1A<\/li>\n<li>Dropout Voltage: 0.5V max at 1A<\/li>\n<li>Input Voltage: up to 26V (continuous), 60V transient<\/li>\n<li>Line Regulation: 0.01%\/V typical<\/li>\n<li>Load Regulation: 0.1%\/A typical<\/li>\n<li>Quiescent Current: 10mA typical at Iout=0<\/li>\n<li>Ripple Rejection: 72dB typical at 120Hz<\/li>\n<li>Protection: Reverse battery, short-circuit, thermal<\/li>\n<li>Package: SOT-223 (4-pin)<\/li>\n<li>Operating Temp: -40C to +125C<\/li>\n<li>RoHS: Compliant (NOPB = No Lead Bar)<\/li>\n<\/ul>\n<h2>\u7279\u70b9<\/h2>\n<ul>\n<li>Ultra-low 0.5V dropout at 1A for efficient regulation<\/li>\n<li>Reverse battery protection for automotive use<\/li>\n<li>60V input transient withstand capability<\/li>\n<li>Short-circuit and thermal shutdown protection<\/li>\n<li>SOT-223 package for compact thermal design<\/li>\n<\/ul>\n<h2>\u5e94\u7528<\/h2>\n<ul>\n<li>Automotive 15V regulated power supplies<\/li>\n<li>Industrial control system 15V rails<\/li>\n<li>Battery-powered 15V regulation<\/li>\n<li>Post-regulation for switch-mode supplies<\/li>\n<li>Telecom 15V line card power<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>Product Overview The LM2940IMP-15\/NOPB from Texas Instruments is a 1A low-dropout (LDO) voltage regulator with a fixed 15V output. It features a maximum dropout voltage of 0.5V at 1A, reverse battery protection, and 60V input transient capability. The SOT-223 package provides efficient thermal performance for automotive and industrial power supply applications. Key Specifications Type: LDO [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[13,32],"tags":[1015],"chip_brand":[138],"class_list":["post-9745","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-low-dropout-regulators-ldo","tag-lm2940imp-15-nopb","chip_brand-ti"],"acf":{"brief_explanation":"1A LDO regulator, 15V fixed out, 0.5V dropout, reverse battery protection, SOT-223, -40~125C","date_code":"","package_case":"SOT-223 (4-pin)","in_stock":13313,"datasheet":"https:\/\/www.ti.com\/product\/LM2940","price":"$1.20 @ 1ku","product_introduction":"The LM2940IMP-15\/NOPB from Texas Instruments is a 1A LDO voltage regulator with 15V fixed output, 0.5V max dropout, and reverse battery protection in a SOT-223 package.","working_principle":"The LM2940 uses a PNP pass transistor to achieve low dropout voltage (0.5V max at 1A). The error amplifier compares a fraction of the output voltage with an internal bandgap reference, adjusting the pass transistor drive to maintain 15V output. The PNP topology allows reverse battery protection since the transistor blocks reverse current flow.","pin_description":"<table><tr><th>Pin<\/th><th>Name<\/th><th>Function<\/th><\/tr><tr><td>1<\/td><td>GND\/Tab<\/td><td>Ground (connected to heatsink tab)<\/td><\/tr><tr><td>2<\/td><td>VOUT<\/td><td>Regulated 15V output<\/td><\/tr><tr><td>3<\/td><td>VIN<\/td><td>Unregulated input (up to 26V)<\/td><\/tr><\/table>","application_scenarios":"<ul><li>Automotive 15V regulated supply<\/li><li>Industrial control 15V rail<\/li><li>Battery-powered 15V regulation<\/li><li>Post-regulation for SMPS<\/li><\/ul>","alternative_models":"<table><tr><th>Model<\/th><th>Manufacturer<\/th><th>Spec1<\/th><th>Spec2<\/th><\/tr><tr><td>LM2940IMP-12\/NOPB<\/td><td>TI<\/td><td>12V\/1A<\/td><td>SOT-223<\/td><\/tr><tr><td>LM2940IMP-5.0\/NOPB<\/td><td>TI<\/td><td>5V\/1A<\/td><td>SOT-223<\/td><\/tr><tr><td>MIC29150-15BW<\/td><td>Microchip<\/td><td>15V\/1.5A<\/td><td>SOT-223<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/9745","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/comments?post=9745"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/9745\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=9745"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=9745"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=9745"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=9745"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}