{"id":7865,"date":"2026-06-28T03:00:55","date_gmt":"2026-06-28T03:00:55","guid":{"rendered":"https:\/\/materialparts.com\/lm2576s-5-0\/"},"modified":"2026-06-28T10:19:58","modified_gmt":"2026-06-28T10:19:58","slug":"lm2576s-5-0","status":"publish","type":"post","link":"https:\/\/materialparts.com\/ar\/lm2576s-5-0\/","title":{"rendered":"LM2576S-5.0"},"content":{"rendered":"

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

The LM2576S-5.0 is a SIMPLE SWITCHER 40V, 3A step-down voltage regulator from Texas Instruments with fixed 5V output, 52kHz switching frequency, in a TO-263-5 surface-mount 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
\u062c\u0647\u062f \u0627\u0644\u062e\u0631\u062c<\/td>\n5V fixed (\u00b14% over line and load)<\/td>\n<\/tr>\n
\u0646\u0637\u0627\u0642 \u062c\u0647\u062f \u0627\u0644\u0625\u062f\u062e\u0627\u0644<\/td>\n7V to 40V<\/td>\n<\/tr>\n
\u062a\u064a\u0627\u0631 \u0627\u0644\u0625\u062e\u0631\u0627\u062c<\/td>\n3A<\/td>\n<\/tr>\n
\u062a\u0631\u062f\u062f \u0627\u0644\u062a\u062d\u0648\u064a\u0644<\/td>\n52kHz fixed<\/td>\n<\/tr>\n
\u062a\u064a\u0627\u0631 \u0627\u0644\u062a\u0647\u062f\u0626\u0629<\/td>\n5mA typical (50\u00b5A standby)<\/td>\n<\/tr>\n
Efficiency<\/td>\n77% typical (VIN=12V, VOUT=5V, IOUT=3A)<\/td>\n<\/tr>\n
\u0627\u0644\u0637\u0648\u0628\u0648\u0644\u0648\u062c\u064a\u0627<\/td>\nBuck (step-down), voltage-mode PWM<\/td>\n<\/tr>\n
Shutdown<\/td>\nYes (ON\/OFF pin, TTL compatible)<\/td>\n<\/tr>\n
Protection<\/td>\nCycle-by-cycle current limit, thermal shutdown<\/td>\n<\/tr>\n
\u062f\u0631\u062c\u0629 \u062d\u0631\u0627\u0631\u0629 \u0627\u0644\u062a\u0634\u063a\u064a\u0644<\/td>\n-40\u00b0C to +125\u00b0C (junction)<\/td>\n<\/tr>\n
\u0627\u0644\u062d\u0632\u0645\u0629<\/td>\nTO-263-5 (D2PAK, surface-mount)<\/td>\n<\/tr>\n<\/table>\n

\u0627\u0644\u0645\u064a\u0632\u0627\u062a<\/h2>\n
    \n
  • Fixed 5V output with \u00b14% accuracy, no external divider needed<\/li>\n
  • Only 4 external components required<\/li>\n
  • 3A output current with internal power switch<\/li>\n
  • 52kHz fixed-frequency oscillator<\/li>\n
  • TTL-compatible ON\/OFF shutdown with 50\u00b5A standby<\/li>\n
  • Cycle-by-cycle current limit and thermal shutdown<\/li>\n
  • Industry-standard SIMPLE SWITCHER pinout<\/li>\n
  • Surface-mount D2PAK package for automated assembly<\/li>\n<\/ul>\n

    \u0627\u0644\u062a\u0637\u0628\u064a\u0642\u0627\u062a<\/h2>\n
      \n
    • 5V logic power from 12V or 24V input<\/li>\n
    • Efficient linear regulator replacement<\/li>\n
    • Automotive and battery-powered systems<\/li>\n
    • Industrial and telecom point-of-load<\/li>\n
    • Distributed power architectures<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The LM2576S-5.0 is a SIMPLE SWITCHER 40V, 3A step-down voltage regulator from Texas Instruments with fixed 5V output, 52kHz switching frequency, in a TO-263-5 surface-mount package. Key Specifications Output Voltage 5V fixed (\u00b14% over line and load) Input Voltage Range 7V to 40V Output Current 3A Switching Frequency 52kHz fixed Quiescent Current 5mA […]<\/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":[31,13],"tags":[],"chip_brand":[138],"class_list":["post-7865","post","type-post","status-publish","format-standard","hentry","category-dc-dc-converters","category-integrated-circuits-ics","chip_brand-ti"],"acf":{"brief_explanation":"3A SIMPLE SWITCHER buck regulator, 7-40V input, fixed 5V output, 52kHz, TO-263-5","date_code":"","package_case":"TO-263-5 (D2PAK, 10.16 x 8.42 x 4.83mm)","in_stock":8920,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/lm2576.pdf","price":"$1.54 @ 1ku","product_introduction":"The LM2576S-5.0 is a fixed 5V output version of the SIMPLE SWITCHER family from Texas Instruments, providing a complete 3A step-down switching regulator requiring only 4 external components. The fixed 5V output eliminates the need for an external resistor divider, simplifying the design. The device operates from 7V to 40V input with 52kHz fixed switching frequency. Internal features include cycle-by-cycle current limiting, thermal shutdown, and output transistor safe-area compensation. The TTL-compatible ON\/OFF pin allows shutdown with only 50\u00b5A standby current. The surface-mount TO-263-5 (D2PAK) package is ideal for automated PCB assembly.","working_principle":"The LM2576S-5.0 uses a fixed-frequency voltage-mode PWM control scheme identical to the adjustable version but with an internal resistor divider that sets the output to 5V. The FB pin is internally connected to the junction of two precision resistors that divide the 5V output down to the 1.23V reference level. When the output voltage is above the setpoint, the error amplifier reduces the switch duty cycle, decreasing the output voltage. When below the setpoint, the duty cycle increases. The internal NPN Darlington switch handles up to 3A output current with a saturation voltage of approximately 1.5V at full load. The external catch diode (Schottky recommended for efficiency) provides a current path during the switch off-time. Under overload conditions, cycle-by-cycle current limiting caps the peak switch current at approximately 4.5A. Under short-circuit conditions, the switching frequency drops to approximately 11kHz to prevent inductor saturation. The thermal shutdown activates at approximately 170\u00b0C junction temperature.","pin_description":"\n
      Pin<\/th>Name<\/th>Type<\/th>Description<\/th><\/tr>\n
      1<\/td>VIN<\/td>Power<\/td>Input supply (7V-40V), bypass with 100\u00b5F<\/td><\/tr>\n
      2<\/td>OUTPUT<\/td>Power<\/td>Switch output (connect to inductor and diode)<\/td><\/tr>\n
      3<\/td>GND<\/td>Power<\/td>Ground (tab is also GND)<\/td><\/tr>\n
      4<\/td>FEEDBACK<\/td>Input<\/td>Feedback (connect directly to output for fixed 5V)<\/td><\/tr>\n
      5<\/td>ON\/OFF<\/td>Input<\/td>Shutdown control (low=on, high=shutdown)<\/td><\/tr>\n<\/table>","application_scenarios":"
        \n
      • 5V Logic Power:<\/strong> Fixed 5V output directly powers TTL, CMOS, and MCU from 12V or 24V without external divider<\/li>\n
      • Automotive 12V to 5V:<\/strong> 40V input handles load dump; 3A output powers navigation, telematics, and ECU logic<\/li>\n
      • Industrial 24V to 5V:<\/strong> 77% efficiency and minimal heatsink replace bulky linear regulators in DIN-rail supplies<\/li>\n
      • Battery Systems:<\/strong> 50\u00b5A standby via ON\/OFF pin extends battery life in portable and backup systems<\/li>\n
      • Distributed Power:<\/strong> Simple 4-component solution generates local 5V rail from higher-voltage distribution bus<\/li>\n<\/ul>","alternative_models":"\n
        Model<\/th>Manufacturer<\/th>Key Difference<\/th>Package<\/th>Specs<\/th><\/tr>\n
        LM2576S-5.0\/NOPB<\/td>TI<\/td>RoHS compliant version<\/td>-<\/td>-<\/td><\/tr>\n
        LM2576T-5.0<\/td>TI<\/td>TO-220 through-hole version<\/td>-<\/td>-<\/td><\/tr>\n
        LM2576HVS-5.0<\/td>TI<\/td>HV version, 60V input max<\/td>-<\/td>-<\/td><\/tr>\n
        LM2676-5.0<\/td>TI<\/td>260kHz, higher efficiency (94%), TO-263<\/td>-<\/td>-<\/td><\/tr>\n
        LMR33630ADDAR<\/td>TI<\/td>3A, 1MHz synchronous, QFN, modern replacement<\/td>-<\/td>-<\/td><\/tr>\n<\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/7865","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=7865"}],"version-history":[{"count":1,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/7865\/revisions"}],"predecessor-version":[{"id":8274,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/7865\/revisions\/8274"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/media?parent=7865"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/categories?post=7865"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/tags?post=7865"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/chip_brand?post=7865"}],"curies":[{"name":"\u062f\u0628\u0644\u064a\u0648 \u0628\u064a","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}