{"id":7858,"date":"2026-06-28T03:00:47","date_gmt":"2026-06-28T03:00:47","guid":{"rendered":"https:\/\/materialparts.com\/lm2576sx-adj-nopb\/"},"modified":"2026-06-28T10:20:07","modified_gmt":"2026-06-28T10:20:07","slug":"lm2576sx-adj-nopb","status":"publish","type":"post","link":"https:\/\/materialparts.com\/ar\/lm2576sx-adj-nopb\/","title":{"rendered":"LM2576SX-ADJ\/NOPB"},"content":{"rendered":"

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

The LM2576SX-ADJ\/NOPB is a SIMPLE SWITCHER 40V, 3A step-down voltage regulator from Texas Instruments with adjustable 1.23V to 37V output, 52kHz switching frequency, and tape-and-reel packaging in a TO-263-5 (D2PAK) 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
\u0646\u0637\u0627\u0642 \u062c\u0647\u062f \u0627\u0644\u0625\u062f\u062e\u0627\u0644<\/td>\n4V to 40V<\/td>\n<\/tr>\n
\u062c\u0647\u062f \u0627\u0644\u062e\u0631\u062c<\/td>\n1.23V to 37V (adjustable)<\/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
Output Tolerance<\/td>\n\u00b14% over line and load<\/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)<\/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, tape & reel)<\/td>\n<\/tr>\n<\/table>\n

\u0627\u0644\u0645\u064a\u0632\u0627\u062a<\/h2>\n
    \n
  • Requires only 4 external components<\/li>\n
  • Adjustable output from 1.23V to 37V<\/li>\n
  • 3A output current capability<\/li>\n
  • 52kHz fixed frequency internal oscillator<\/li>\n
  • TTL-compatible shutdown with 50\u00b5A standby current<\/li>\n
  • Cycle-by-cycle current limiting for overload protection<\/li>\n
  • Thermal shutdown and output transistor safe-area compensation<\/li>\n
  • Uses standard off-the-shelf inductors<\/li>\n<\/ul>\n

    \u0627\u0644\u062a\u0637\u0628\u064a\u0642\u0627\u062a<\/h2>\n
      \n
    • Simple buck converter power supplies<\/li>\n
    • Efficient replacement for linear regulators<\/li>\n
    • Battery-powered and automotive systems<\/li>\n
    • Post-regulation for switching supplies<\/li>\n
    • Positive-to-negative buck-boost conversion<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The LM2576SX-ADJ\/NOPB is a SIMPLE SWITCHER 40V, 3A step-down voltage regulator from Texas Instruments with adjustable 1.23V to 37V output, 52kHz switching frequency, and tape-and-reel packaging in a TO-263-5 (D2PAK) package. Key Specifications Input Voltage Range 4V to 40V Output Voltage 1.23V to 37V (adjustable) Output Current 3A Switching Frequency 52kHz fixed Output […]<\/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-7858","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, 4-40V, adj 1.23-37V, 52kHz, TO-263-5 T&R","date_code":"","package_case":"TO-263-5 (D2PAK, 10.16 x 8.42 x 4.83mm)","in_stock":3080,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/lm2576.pdf","price":"$2.18 @ 1ku","product_introduction":"The LM2576SX-ADJ\/NOPB is a member of the SIMPLE SWITCHER family from Texas Instruments, providing a complete 3A step-down (buck) switching regulator in a single IC with only 4 external components needed. The adjustable version outputs 1.23V to 37V from a 4V to 40V input, with \u00b14% output tolerance over line and load conditions. The 52kHz fixed-frequency oscillator eliminates the need for external timing components. A TTL-compatible ON\/OFF pin enables shutdown mode with only 50\u00b5A standby current. Internal protection features include cycle-by-cycle current limiting, thermal shutdown, and output transistor safe-area compensation. The SX suffix denotes tape-and-reel packaging in the surface-mount TO-263-5 (D2PAK) package.","working_principle":"The LM2576SX-ADJ uses a fixed-frequency voltage-mode PWM control scheme. An internal 52kHz oscillator generates the switching timing. The output voltage is sensed through an external resistor divider connected to the feedback (FB) pin, which is compared with the internal 1.23V reference. The error amplifier output controls the duty cycle of the internal NPN Darlington switch transistor. When the switch is on, current flows through the inductor to the output and the inductor stores energy. When the switch turns off, the inductor current flows through the external catch diode to the output, releasing stored energy. The output capacitor smooths the voltage ripple. Cycle-by-cycle current limiting monitors the switch current on each switching cycle and terminates the on-time if the current exceeds approximately 4.5A. Under short-circuit conditions, when the FB pin voltage drops below approximately 0.58V, the switching frequency is reduced to about 11kHz, allowing the inductor current sufficient time to ramp down during the off-time and preventing inductor saturation. The thermal shutdown circuit disables the switch when the junction temperature exceeds approximately 170\u00b0C.","pin_description":"\n
      Pin<\/th>Name<\/th>Type<\/th>Description<\/th><\/tr>\n
      1<\/td>VIN<\/td>Power<\/td>Input supply (4V-40V), bypass with 100\u00b5F capacitor<\/td><\/tr>\n
      2<\/td>OUTPUT<\/td>Power<\/td>Switch output (connect to inductor and catch 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 input (connect external resistor divider to output)<\/td><\/tr>\n
      5<\/td>ON\/OFF<\/td>Input<\/td>Shutdown control (low=on, high=shutdown, TTL compatible)<\/td><\/tr>\n<\/table>","application_scenarios":"
        \n
      • Linear Regulator Replacement:<\/strong> 77% efficiency and minimal heatsink reduce size and cost vs LM7805 at higher input-output differentials<\/li>\n
      • Automotive Power:<\/strong> 40V input handles load dump; 3A output powers MCU, sensors, and displays from 12V battery<\/li>\n
      • Battery Systems:<\/strong> 50\u00b5A standby current via ON\/OFF pin minimizes battery drain when system is in sleep mode<\/li>\n
      • Adjustable Supplies:<\/strong> External resistor divider sets any voltage from 1.23V to 37V for custom rail requirements<\/li>\n
      • Buck-Boost:<\/strong> Can be configured as positive-to-negative converter for generating negative supply rails<\/li>\n<\/ul>","alternative_models":"\n
        Model<\/th>Manufacturer<\/th>Key Difference<\/th>Package<\/th>Specs<\/th><\/tr>\n
        LM2576S-ADJ\/NOPB<\/td>TI<\/td>Same in tube packaging (not T&R)<\/td>-<\/td>-<\/td><\/tr>\n
        LM2576HVSX-ADJ\/NOPB<\/td>TI<\/td>HV version, 4V-60V input, up to 57V output<\/td>-<\/td>-<\/td><\/tr>\n
        LM2576SX-5.0\/NOPB<\/td>TI<\/td>Fixed 5V output version<\/td>-<\/td>-<\/td><\/tr>\n
        LM2676T-ADJ<\/td>TI<\/td>260kHz, higher efficiency, TO-220<\/td>-<\/td>-<\/td><\/tr>\n
        LMR33630<\/td>TI<\/td>Modern replacement, 3A, 1MHz synchronous, QFN<\/td>-<\/td>-<\/td><\/tr>\n<\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/7858","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=7858"}],"version-history":[{"count":1,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/7858\/revisions"}],"predecessor-version":[{"id":8281,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/7858\/revisions\/8281"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/media?parent=7858"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/categories?post=7858"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/tags?post=7858"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/chip_brand?post=7858"}],"curies":[{"name":"\u062f\u0628\u0644\u064a\u0648 \u0628\u064a","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}