{"id":6683,"date":"2026-06-19T01:20:46","date_gmt":"2026-06-19T01:20:46","guid":{"rendered":"https:\/\/materialparts.com\/lm2675mx-3-3-2\/"},"modified":"2026-06-19T01:20:46","modified_gmt":"2026-06-19T01:20:46","slug":"lm2675mx-3-3-2","status":"publish","type":"post","link":"https:\/\/materialparts.com\/ar\/lm2675mx-3-3-2\/","title":{"rendered":"LM2675MX-3.3"},"content":{"rendered":"

\u0646\u0638\u0631\u0629 \u0639\u0627\u0645\u0629 \u0639\u0644\u0649 \u0627\u0644\u0645\u0646\u062a\u062c<\/h2>\n

The LM2675MX-3.3 from Texas Instruments is a SIMPLE SWITCHER\u00ae step-down voltage regulator providing a fixed 3.3V output at up to 1A from an 8V to 40V input. Built with LMDMOS process, it achieves up to 96% efficiency with only 5 external components. The 260 kHz fixed-frequency oscillator enables small filter components, while internal frequency compensation, thermal shutdown, and current limit provide a robust and easy-to-use buck converter solution in an SOIC-8 package.<\/p>\n

\u0627\u0644\u0645\u0648\u0627\u0635\u0641\u0627\u062a \u0627\u0644\u0631\u0626\u064a\u0633\u064a\u0629<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u0627\u0644\u0637\u0648\u0628\u0648\u0644\u0648\u062c\u064a\u0627<\/td>\nStep-Down (Buck)<\/td>\n<\/tr>\n
\u062c\u0647\u062f \u0627\u0644\u062e\u0631\u062c<\/td>\n3.3V (fixed)<\/td>\n<\/tr>\n
\u0646\u0637\u0627\u0642 \u062c\u0647\u062f \u0627\u0644\u0625\u062f\u062e\u0627\u0644<\/td>\n8V to 40V<\/td>\n<\/tr>\n
\u062a\u064a\u0627\u0631 \u0627\u0644\u0625\u062e\u0631\u0627\u062c<\/td>\n1A (maximum)<\/td>\n<\/tr>\n
Efficiency<\/td>\nUp to 96%<\/td>\n<\/tr>\n
\u062a\u0631\u062f\u062f \u0627\u0644\u062a\u062d\u0648\u064a\u0644<\/td>\n260 kHz (fixed)<\/td>\n<\/tr>\n
Output Voltage Tolerance<\/td>\n\u00b11.5% over line and load<\/td>\n<\/tr>\n
\u062a\u064a\u0627\u0631 \u0627\u0644\u062a\u0647\u062f\u0626\u0629<\/td>\n2.5 mA (typical)<\/td>\n<\/tr>\n
\u0627\u0644\u062a\u064a\u0627\u0631 \u0627\u0644\u0627\u062d\u062a\u064a\u0627\u0637\u064a<\/td>\n50 \u00b5A (shutdown mode)<\/td>\n<\/tr>\n
Duty Cycle (max)<\/td>\n95%<\/td>\n<\/tr>\n
\u0648\u0636\u0639 \u0627\u0644\u062a\u062d\u0643\u0645<\/td>\nVoltage mode with internal compensation<\/td>\n<\/tr>\n
\u062f\u0631\u062c\u0629 \u062d\u0631\u0627\u0631\u0629 \u0627\u0644\u062a\u0634\u063a\u064a\u0644<\/td>\n-40 \u062f\u0631\u062c\u0629 \u0645\u0626\u0648\u064a\u0629 \u0625\u0644\u0649 +125 \u062f\u0631\u062c\u0629 \u0645\u0626\u0648\u064a\u0629<\/td>\n<\/tr>\n
\u0627\u0644\u062d\u0632\u0645\u0629<\/td>\nSOIC-8 (4.9\u00d73.9 mm)<\/td>\n<\/tr>\n<\/table>\n

\u0627\u0644\u0645\u064a\u0632\u0627\u062a<\/h2>\n
    \n
  • SIMPLE SWITCHER: only 5 external components needed<\/li>\n
  • Fixed 3.3V output with \u00b11.5% tolerance<\/li>\n
  • Up to 96% efficiency \u2014 PCB traces provide sufficient heatsinking<\/li>\n
  • 260 kHz fixed frequency for small filter components<\/li>\n
  • Internal frequency compensation \u2014 no external compensation network<\/li>\n
  • TTL-compatible shutdown\/enable pin (50 \u00b5A standby)<\/li>\n
  • Thermal shutdown and current limit protection<\/li>\n
  • Also available in 5V, 12V, and adjustable output versions<\/li>\n<\/ul>\n

    \u0627\u0644\u062a\u0637\u0628\u064a\u0642\u0627\u062a<\/h2>\n
      \n
    • 3.3V logic power from 12V or 24V industrial bus<\/li>\n
    • Automotive battery to 3.3V microcontroller power<\/li>\n
    • Telecom distributed power architecture<\/li>\n
    • Industrial control and automation power<\/li>\n
    • Battery-powered high-voltage to 3.3V conversion<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The LM2675MX-3.3 from Texas Instruments is a SIMPLE SWITCHER\u00ae step-down voltage regulator providing a fixed 3.3V output at up to 1A from an 8V to 40V input. Built with LMDMOS process, it achieves up to 96% efficiency with only 5 external components. The 260 kHz fixed-frequency oscillator enables small filter components, while internal […]<\/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":[13,29],"tags":[],"chip_brand":[138],"class_list":["post-6683","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-power-management-ics-pmic","chip_brand-ti"],"acf":{"brief_explanation":"SIMPLE SWITCHER buck, 8-40V in, 3.3V\/1A out, 96% eff, SOIC-8","date_code":"","package_case":"SOIC-8 (4.9\u00d73.9\u00d71.5 mm, 1.27mm pitch)","in_stock":26767,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/lm2675.pdf","price":"$2.15 @ 1ku","product_introduction":"The LM2675MX-3.3 from Texas Instruments is a SIMPLE SWITCHER step-down regulator providing fixed 3.3V output at up to 1A from 8V to 40V input. Achieving up to 96% efficiency with only 5 external components, its 260 kHz fixed frequency and internal compensation simplify design. With thermal shutdown, current limit, and TTL shutdown in an SOIC-8 package, it is ideal for 3.3V logic power from 12V\/24V industrial supplies, automotive systems, and telecom power.","working_principle":"The LM2675MX-3.3 uses a voltage-mode buck converter topology with a fixed 260 kHz oscillator and patented internal frequency compensation. The LMDMOS power switch (0.25 \u03a9 RDS(ON)) is integrated on-chip. During each switching cycle, the high-side switch connects the input voltage to the inductor, ramping up inductor current. When the switch turns off, the external Schottky catch diode conducts and inductor current ramps down, delivering energy to the output. The error amplifier compares an internal resistor divider tap (set to 3.3V) with a 1.21V reference, adjusting PWM duty cycle to maintain regulation. The voltage-mode control with internal compensation ensures stability across the specified input\/output range and inductor values. The ON\/OFF pin provides TTL-compatible shutdown: pulling it low enables normal operation, while pulling it high or leaving it open puts the device in standby (50 \u00b5A).","pin_description":"\n
      Pin<\/th>Name<\/th>Type<\/th>Function<\/th><\/tr>\n
      1<\/td>CB<\/td>I\/O<\/td>Boot capacitor connection for high-side driver<\/td><\/tr>\n
      2<\/td>VIN<\/td>Power<\/td>Input supply voltage (8-40V)<\/td><\/tr>\n
      3<\/td>SW<\/td>Output<\/td>Switch output to inductor<\/td><\/tr>\n
      4<\/td>GND<\/td>Power<\/td>Ground<\/td><\/tr>\n
      5<\/td>FB<\/td>Input<\/td>Feedback (connect to output for fixed 3.3V version)<\/td><\/tr>\n
      6<\/td>ON\/OFF<\/td>Input<\/td>Shutdown control (LOW=on, HIGH\/open=off)<\/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 industrial bus to 3.3V microcontroller and logic power<\/li>\n
      • Automotive 12V battery to 3.3V MCU and sensor supply<\/li>\n
      • Telecom -48V to 3.3V via intermediate bus converter<\/li>\n
      • Industrial automation and PLC 3.3V power rails<\/li>\n
      • Battery-powered portable instruments needing 3.3V from high voltage<\/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>5V fixed output version<\/td><\/tr>\n
        TI<\/td>LM2675MX-12<\/td>SOIC-8<\/td>12V fixed output version<\/td><\/tr>\n
        TI<\/td>LM2675MX-ADJ<\/td>SOIC-8<\/td>Adjustable 1.21V-37V output<\/td><\/tr>\n
        TI<\/td>LM2679MX-3.3<\/td>TO-263-7<\/td>5A version, higher current<\/td><\/tr>\n
        Monolithic Power<\/td>MP8759GD<\/td>SOIC-8<\/td>4A, 4.5-55V, newer alternative<\/td><\/tr>\n<\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/6683","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/comments?post=6683"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/6683\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/media?parent=6683"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/categories?post=6683"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/tags?post=6683"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/chip_brand?post=6683"}],"curies":[{"name":"\u062f\u0628\u0644\u064a\u0648 \u0628\u064a","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}