{"id":6301,"date":"2026-06-12T11:25:00","date_gmt":"2026-06-12T11:25:00","guid":{"rendered":"https:\/\/materialparts.com\/lm2576r-adj\/"},"modified":"2026-06-12T11:25:00","modified_gmt":"2026-06-12T11:25:00","slug":"lm2576r-adj","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/lm2576r-adj\/","title":{"rendered":"LM2576R-ADJ"},"content":{"rendered":"

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

The LM2576R-ADJ from Texas Instruments is a 3A step-down switching voltage regulator with adjustable output from 1.23V to 37V. Operating at 52kHz switching frequency in a TO-263-5 (D2PAK) package, it requires minimal external components and achieves up to 88% efficiency.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n
\u8f93\u5165\u7535\u538b<\/td>\n4V – 40V<\/td>\n<\/tr>\n
\u8f93\u51fa\u7535\u6d41<\/td>\n3A<\/td>\n<\/tr>\n
Output Voltage<\/td>\n1.23V – 37V (adjustable)<\/td>\n<\/tr>\n
\u5f00\u5173\u9891\u7387<\/td>\n52kHz<\/td>\n<\/tr>\n
Efficiency<\/td>\nUp to 88%<\/td>\n<\/tr>\n
Saturation Voltage<\/td>\n1.5V (typ) @3A<\/td>\n<\/tr>\n
\u9759\u6001\u7535\u6d41<\/td>\n5mA (typ)<\/td>\n<\/tr>\n
\u5173\u673a\u7535\u6d41<\/td>\n50\u00b5A<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n-40\u00b0C to +125\u00b0C<\/td>\n<\/tr>\n
\u5305\u88c5<\/td>\nTO-263-5 (R suffix, D2PAK)<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • Only 4 external components required for a complete regulator<\/li>\n
  • Adjustable output from 1.23V to 37V with 1% feedback reference<\/li>\n
  • 52kHz fixed frequency for simple filter design<\/li>\n
  • Built-in thermal shutdown and current limit protection<\/li>\n
  • 50\u00b5A standby current in shutdown mode<\/li>\n
  • Industry-standard pinout compatible with LM2575\/LM2577<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • 12V\/24V to 5V\/3.3V step-down conversion<\/li>\n
    • Battery charger and automotive power supplies<\/li>\n
    • Distributed power system pre-regulation<\/li>\n
    • Simple and cost-effective buck regulator designs<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The LM2576R-ADJ from Texas Instruments is a 3A step-down switching voltage regulator with adjustable output from 1.23V to 37V. Operating at 52kHz switching frequency in a TO-263-5 (D2PAK) package, it requires minimal external components and achieves up to 88% efficiency. Key Specifications Input Voltage 4V – 40V Output Current 3A Output Voltage 1.23V […]<\/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-6301","post","type-post","status-publish","format-standard","hentry","category-dc-dc-converters","category-integrated-circuits-ics","chip_brand-ti"],"acf":{"brief_explanation":"3A adjustable step-down switching regulator, 4-40V input, 52kHz, TO-263-5 (D2PAK)","date_code":"","package_case":"TO-263-5 (D2PAK, 10.3 x 8.6mm)","in_stock":9462,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/lm2576.pdf","price":"$1.22 @1ku","product_introduction":"The LM2576R-ADJ from Texas Instruments is a classic 3A step-down switching voltage regulator with an adjustable output range of 1.23V to 37V. Its simplicity is a key advantage - only an inductor, catch diode, input capacitor, output capacitor, and two feedback resistors are needed for a complete regulator. The 52kHz fixed switching frequency simplifies inductor selection and EMI filtering. Packaged in a TO-263-5 (D2PAK) surface-mount outline, it provides excellent thermal performance for medium-power buck conversion applications.","working_principle":"The LM2576R-ADJ uses a fixed-frequency (52kHz) current-mode buck regulator topology. The internal oscillator generates a fixed-frequency clock that turns on the integrated NPN power transistor. The current through the transistor (and inductor) is sensed and compared with the error amplifier output. When the peak current threshold is reached, the transistor turns off and the catch diode conducts, allowing the inductor current to freewheel. The error amplifier compares the feedback voltage (from the external resistor divider) with the 1.23V internal reference, adjusting the duty cycle to maintain the desired output voltage. Current limiting and thermal shutdown provide fault protection.","pin_description":"
      Pin<\/th>Name<\/th>Description<\/th><\/tr>
      1<\/td>VIN<\/td>Input supply (4-40V)<\/td><\/tr>
      2<\/td>Output<\/td>Switching output (inductor connection)<\/td><\/tr>
      3<\/td>GND<\/td>Ground<\/td><\/tr>
      4<\/td>Feedback<\/td>Output voltage feedback (1.23V reference)<\/td><\/tr>
      5<\/td>\/ON-OFF<\/td>Shutdown control (active low)<\/td><\/tr><\/table>","application_scenarios":"
      • 12V automotive to 5V\/3.3V step-down power supply<\/li>
      • 24V industrial bus to lower voltage rail conversion<\/li>
      • Battery-powered equipment voltage regulation<\/li>
      • Simple and cost-effective distributed power regulation<\/li><\/ul>","alternative_models":"
        Model<\/th>Manufacturer<\/th>Vin<\/th>Iout<\/th>Frequency<\/th><\/tr>
        LM2576-5.0<\/td>TI<\/td>4-40V<\/td>3A<\/td>52kHz<\/td><\/tr>
        LM2596-ADJ<\/td>TI<\/td>4-40V<\/td>3A<\/td>150kHz<\/td><\/tr>
        XL4015<\/td>XLSEMI<\/td>8-36V<\/td>5A<\/td>180kHz<\/td><\/tr>
        AP1509-ADJ<\/td>BCD<\/td>4.5-40V<\/td>2A<\/td>150kHz<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/6301","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=6301"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/6301\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=6301"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=6301"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=6301"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=6301"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}