{"id":6669,"date":"2026-06-19T01:06:21","date_gmt":"2026-06-19T01:06:21","guid":{"rendered":"https:\/\/materialparts.com\/lm2675mx-3-3\/"},"modified":"2026-06-19T01:06:21","modified_gmt":"2026-06-19T01:06:21","slug":"lm2675mx-3-3","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/lm2675mx-3-3\/","title":{"rendered":"LM2675MX-3.3"},"content":{"rendered":"

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

The LM2675MX-3.3 from Texas Instruments is a 1A step-down voltage regulator from the SIMPLE SWITCHER family, providing a fixed 3.3V output from up to 40V input. With 150 kHz fixed switching frequency and integrated high-side MOSFET, it simplifies 3.3V rail generation from 5V, 12V, or 24V sources with minimal external components in an SOIC-8 package.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n
\u62d3\u6251\u7ed3\u6784<\/td>\nBuck (Step-Down)<\/td>\n<\/tr>\n
\u8f93\u5165\u7535\u538b\u8303\u56f4<\/td>\n6.5V to 40V<\/td>\n<\/tr>\n
Output Voltage<\/td>\n3.3V (fixed)<\/td>\n<\/tr>\n
\u8f93\u51fa\u7535\u6d41<\/td>\n1A<\/td>\n<\/tr>\n
\u5f00\u5173\u9891\u7387<\/td>\n150 kHz (fixed)<\/td>\n<\/tr>\n
Efficiency<\/td>\nUp to 88%<\/td>\n<\/tr>\n
Output Voltage Accuracy<\/td>\n\u00b12%<\/td>\n<\/tr>\n
\u9759\u6001\u7535\u6d41<\/td>\n2.5 mA (typical)<\/td>\n<\/tr>\n
\u5173\u673a\u7535\u6d41<\/td>\n50 \u00b5A (typical)<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n-40\u00b0C to +125\u00b0C (junction)<\/td>\n<\/tr>\n
\u5305\u88c5<\/td>\nSOIC-8 (3.9mm width)<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • Fixed 3.3V output with \u00b12% accuracy<\/li>\n
  • SIMPLE SWITCHER: minimal external components<\/li>\n
  • 6.5V to 40V input range<\/li>\n
  • 1A output current with integrated MOSFET<\/li>\n
  • 150 kHz switching frequency<\/li>\n
  • Internal soft-start and thermal shutdown<\/li>\n
  • Available in 3.3V, 5V, 12V, and adjustable versions<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • 12V\/24V to 3.3V step-down for MCU power<\/li>\n
    • Industrial 24V bus to 3.3V point-of-load<\/li>\n
    • Automative 12V to 3.3V logic supply<\/li>\n
    • Distributed power system 3.3V rail<\/li>\n
    • Battery-powered 3.3V supply generation<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The LM2675MX-3.3 from Texas Instruments is a 1A step-down voltage regulator from the SIMPLE SWITCHER family, providing a fixed 3.3V output from up to 40V input. With 150 kHz fixed switching frequency and integrated high-side MOSFET, it simplifies 3.3V rail generation from 5V, 12V, or 24V sources with minimal external components in an […]<\/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":[],"chip_brand":[138],"class_list":["post-6669","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-low-dropout-regulators-ldo","chip_brand-ti"],"acf":{"brief_explanation":"1A buck, 6.5-40V in, fixed 3.3V out, 150kHz, SOIC-8","date_code":"","package_case":"SOIC-8 (4.9\u00d73.9\u00d71.5 mm, 1.27mm pitch)","in_stock":5800,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/lm2675.pdf","price":"$2.45 @ 1ku","product_introduction":"The LM2675MX-3.3 from Texas Instruments is a 1A SIMPLE SWITCHER step-down regulator providing fixed 3.3V output from 6.5V to 40V input. With 150 kHz switching, integrated MOSFET, and minimal external components, it is the simplest way to generate a 3.3V logic supply from 12V or 24V sources in automotive, industrial, and embedded systems.","working_principle":"The LM2675MX-3.3 uses fixed-frequency current-mode PWM control. The internal 150 kHz oscillator sets the switching frequency. The error amplifier compares an internal 3.3V reference with the output voltage (FB pin connected directly to output for the fixed-voltage version). The PWM comparator modulates the duty cycle of the integrated high-side NPN Darlington switch. During on-time, energy is stored in the external inductor. During off-time, the external Schottky catch diode provides a current path for the inductor. Current-mode control provides inherent cycle-by-cycle current limiting and fast line\/load transient response. The internal soft-start prevents excessive inrush current at startup.","pin_description":"\n
      Pin<\/th>Name<\/th>Type<\/th>Function<\/th><\/tr>\n
      1<\/td>CB<\/td>I\/O<\/td>Bootstrap capacitor (connect 0.01\u00b5F to SW)<\/td><\/tr>\n
      2<\/td>FB<\/td>Input<\/td>Feedback (connect to output for fixed voltage version)<\/td><\/tr>\n
      3<\/td>ON\/OFF<\/td>Input<\/td>Shutdown control (float to enable, pull LOW to disable)<\/td><\/tr>\n
      4<\/td>GND<\/td>Power<\/td>Ground<\/td><\/tr>\n
      5<\/td>VIN<\/td>Power<\/td>Input supply (6.5-40V)<\/td><\/tr>\n
      6<\/td>SW<\/td>Output<\/td>Switch output (connect to inductor and catch diode)<\/td><\/tr>\n
      7<\/td>NC<\/td>\u2014<\/td>No connect<\/td><\/tr>\n
      8<\/td>NC<\/td>\u2014<\/td>No connect<\/td><\/tr>\n<\/table>","application_scenarios":"
        \n
      • 12V\/24V to 3.3V step-down conversion for MCU and logic power<\/li>\n
      • Industrial 24V bus to 3.3V point-of-load regulation<\/li>\n
      • Automotive 12V battery to 3.3V logic supply<\/li>\n
      • Distributed power system 3.3V secondary rail<\/li>\n
      • Battery-powered 3.3V supply from 9V or 12V source<\/li>\n<\/ul>","alternative_models":"\n
        Manufacturer<\/th>Part Number<\/th>Package<\/th>Notes<\/th><\/tr>\n
        TI<\/td>LM2675MX-5.0<\/td>SOIC-8<\/td>Fixed 5V output version<\/td><\/tr>\n
        TI<\/td>LM2675MX-12<\/td>SOIC-8<\/td>Fixed 12V output version<\/td><\/tr>\n
        TI<\/td>LM2675MX-ADJ<\/td>SOIC-8<\/td>Adjustable output version<\/td><\/tr>\n
        TI<\/td>LM2841XMK-3.3<\/td>SOT-23-6<\/td>100mA, 42V, smaller package<\/td><\/tr>\n
        Richtek<\/td>RT8258GQW<\/td>WDFN-10<\/td>4.5-36V, 2A, 340kHz<\/td><\/tr>\n<\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/6669","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=6669"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/6669\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=6669"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=6669"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=6669"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=6669"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}