{"id":5479,"date":"2026-06-10T04:01:25","date_gmt":"2026-06-10T04:01:25","guid":{"rendered":"https:\/\/materialparts.com\/lm2676sx-5-0-nopb\/"},"modified":"2026-06-10T04:01:25","modified_gmt":"2026-06-10T04:01:25","slug":"lm2676sx-5-0-nopb","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/lm2676sx-5-0-nopb\/","title":{"rendered":"LM2676SX-5.0\/NOPB"},"content":{"rendered":"

\u4ea7\u54c1\u6982\u89c8<\/h2>\n

The LM2676SX-5.0\/NOPB from Texas Instruments is a SIMPLE SWITCHER high-efficiency 3A step-down voltage regulator with fixed 5V output in a 7-pin TO-263 surface-mount package. Using a 150mOhm DMOS output switch for >90% efficiency, it operates at 260kHz with 8-40V input. The BOOST pin provides gate drive enhancement for the DMOS switch.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n
Output Voltage<\/td>\n5.0V fixed (also 3.3V, 12V, adj)<\/td>\n<\/tr>\n
\u8f93\u5165\u7535\u538b<\/td>\n8V to 40V<\/td>\n<\/tr>\n
\u8f93\u51fa\u7535\u6d41<\/td>\n3A<\/td>\n<\/tr>\n
\u5f00\u5173\u9891\u7387<\/td>\n260kHz fixed<\/td>\n<\/tr>\n
Efficiency<\/td>\nUp to 94%<\/td>\n<\/tr>\n
DMOS Rds(on)<\/td>\n150mOhm<\/td>\n<\/tr>\n
Standby Current<\/td>\n50uA (ON\/OFF=high)<\/td>\n<\/tr>\n
Output Tolerance<\/td>\n+\/-2% max<\/td>\n<\/tr>\n
Protection<\/td>\nThermal shutdown, current limit<\/td>\n<\/tr>\n
Operating Temp<\/td>\n-40 to +125 C (TJ)<\/td>\n<\/tr>\n
\u5305\u88c5<\/td>\nTO-263-7<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • 150mOhm DMOS output switch for >90% efficiency<\/li>\n
  • 260kHz fixed frequency for small inductors<\/li>\n
  • +\/-2% output voltage tolerance<\/li>\n
  • 50uA low standby current in shutdown<\/li>\n
  • BOOST pin for enhanced gate drive<\/li>\n
  • Thermal shutdown and current limit protection<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • High-efficiency 5V power from 12V\/24V bus<\/li>\n
    • Communication module power supplies<\/li>\n
    • Electric meter power supplies<\/li>\n
    • Motor driver auxiliary supplies<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The LM2676SX-5.0\/NOPB from Texas Instruments is a SIMPLE SWITCHER high-efficiency 3A step-down voltage regulator with fixed 5V output in a 7-pin TO-263 surface-mount package. Using a 150mOhm DMOS output switch for >90% efficiency, it operates at 260kHz with 8-40V input. The BOOST pin provides gate drive enhancement for the DMOS switch. Key Specifications […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[31,13],"tags":[],"chip_brand":[138],"class_list":["post-5479","post","type-post","status-publish","format-standard","hentry","category-dc-dc-converters","category-integrated-circuits-ics","chip_brand-ti"],"acf":{"brief_explanation":"3A buck, 5V fixed, 40V max, 260kHz, DMOS, TO-263-7","date_code":"","package_case":"TO-263-7 (10.10 x 8.89 mm)","in_stock":10244,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/lm2676.pdf","price":"$2.45 @ 1ku","product_introduction":"The LM2676SX-5.0\/NOPB from Texas Instruments is a SIMPLE SWITCHER high-efficiency 3A step-down voltage regulator with fixed 5V output in a 7-pin TO-263 surface-mount package. Using a 150mOhm DMOS output switch for >90% efficiency, it operates at 260kHz with 8-40V input. The BOOST pin provides gate drive enhancement for the DMOS switch.","working_principle":"The LM2676SX-5.0\/NOPB operates as described in the product overview. Key subsystems include the input stage, processing\/gain stage, output stage, and protection circuitry as detailed in the datasheet.","pin_description":"
      Pin<\/th>Name<\/th>Type<\/th>Description<\/th><\/tr>
      1<\/td>SWITCH<\/td>Output<\/td>DMOS switch output to inductor<\/td><\/tr>
      2<\/td>INPUT<\/td>Input<\/td>Unregulated input (8-40V)<\/td><\/tr>
      3<\/td>CB<\/td>I\/O<\/td>Boost capacitor for gate drive<\/td><\/tr>
      4<\/td>GND<\/td>Power<\/td>Ground<\/td><\/tr>
      5<\/td>FEEDBACK<\/td>Input<\/td>Feedback sense<\/td><\/tr>
      6<\/td>ON\/OFF<\/td>Input<\/td>Shutdown (high=off)<\/td><\/tr>
      7<\/td>NC<\/td>-<\/td>No connect<\/td><\/tr>
      Tab<\/td>GND<\/td>Power<\/td>Ground\/thermal pad<\/td><\/tr><\/table>","application_scenarios":"
      • High-efficiency 5V power from 12V\/24V bus<\/li>
      • Communication module power supplies<\/li>
      • Electric meter power supplies<\/li>
      • Motor driver auxiliary supplies<\/li><\/ul>","alternative_models":"
        Model<\/th>Manufacturer<\/th>Package<\/th>Notes<\/th><\/tr>
        LM2676T-5.0<\/td>TI<\/td>TO-220-7<\/td>Through-hole version<\/td><\/tr>
        LM2596S-5.0<\/td>TI<\/td>TO-263-5<\/td>Lower cost, bipolar output<\/td><\/tr>
        LMR33630ADDFR<\/td>TI<\/td>SOT-23-THIN<\/td>Modern 3A replacement<\/td><\/tr>
        TPS54360DDAR<\/td>TI<\/td>SOIC-8<\/td>Higher Vin, modern<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/5479","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=5479"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/5479\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=5479"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=5479"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=5479"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=5479"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}