{"id":10578,"date":"2026-07-20T06:13:00","date_gmt":"2026-07-20T06:13:00","guid":{"rendered":"https:\/\/ic-vendor.com\/l5973d013tr\/"},"modified":"2026-07-20T06:13:00","modified_gmt":"2026-07-20T06:13:00","slug":"l5973d013tr","status":"publish","type":"post","link":"https:\/\/ic-vendor.com\/ar\/l5973d013tr\/","title":{"rendered":"L5973D013TR"},"content":{"rendered":"

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

The L5973D013TR from STMicroelectronics is a step-down monolithic power switching regulator with a 2.5A internal switch in an HSOP-8 exposed pad package. It accepts input voltages from 4V to 36V and provides an adjustable output from 1.235V to 35V. The device features a fixed 250 kHz switching frequency with an internal P-channel D-MOS transistor (Rds(on) = 250 m\u03a9).<\/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
\u0646\u0637\u0627\u0642 \u062c\u0647\u062f \u0627\u0644\u0625\u062f\u062e\u0627\u0644<\/td>\n4V to 36V<\/td>\n<\/tr>\n
Output Voltage Range<\/td>\n1.235V to 35V (adjustable)<\/td>\n<\/tr>\n
\u0627\u0644\u062d\u062f \u0627\u0644\u0623\u0642\u0635\u0649 \u0644\u062a\u064a\u0627\u0631 \u0627\u0644\u0625\u062e\u0631\u0627\u062c \u0627\u0644\u0623\u0642\u0635\u0649<\/td>\n2A (continuous), 2.5A (switch limit)<\/td>\n<\/tr>\n
\u062a\u0631\u062f\u062f \u0627\u0644\u062a\u062d\u0648\u064a\u0644<\/td>\n250 kHz (fixed)<\/td>\n<\/tr>\n
Rds(on)<\/td>\n250 m\u03a9 (typical)<\/td>\n<\/tr>\n
Reference Voltage<\/td>\n3.3V (\u00b12%)<\/td>\n<\/tr>\n
\u0627\u0644\u0645\u0642\u0627\u0648\u0645\u0629 \u0627\u0644\u062d\u0631\u0627\u0631\u064a\u0629 (RthJA)<\/td>\n40\u00b0C\/W<\/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 150\u00b0C (junction)<\/td>\n<\/tr>\n
\u0627\u0644\u062d\u0632\u0645\u0629<\/td>\nHSOP-8 with exposed pad<\/td>\n<\/tr>\n
Packing<\/td>\nTape & Reel<\/td>\n<\/tr>\n<\/table>\n

\u0627\u0644\u0645\u064a\u0632\u0627\u062a<\/h2>\n
    \n
  • 2.5A internal P-channel D-MOS switch<\/li>\n
  • 100% duty cycle for low dropout operation<\/li>\n
  • Voltage feedforward for excellent line regulation<\/li>\n
  • Zero load current operation<\/li>\n
  • Internal current limiting with frequency foldback for short-circuit protection<\/li>\n
  • Thermal shutdown protection<\/li>\n
  • Inhibit pin for zero current consumption in standby<\/li>\n
  • Protection against feedback disconnection<\/li>\n
  • Synchronization pin (up to 500 kHz)<\/li>\n<\/ul>\n

    \u0627\u0644\u062a\u0637\u0628\u064a\u0642\u0627\u062a<\/h2>\n
      \n
    • 5V bus step-down converters in computing applications<\/li>\n
    • Industrial power supplies and distributed power systems<\/li>\n
    • Battery-powered equipment and chargers<\/li>\n
    • LED driver power stages<\/li>\n
    • Automotive auxiliary power rails<\/li>\n
    • Telecom and networking equipment<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The L5973D013TR from STMicroelectronics is a step-down monolithic power switching regulator with a 2.5A internal switch in an HSOP-8 exposed pad package. It accepts input voltages from 4V to 36V and provides an adjustable output from 1.235V to 35V. The device features a fixed 250 kHz switching frequency with an internal P-channel D-MOS […]<\/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":[1914],"chip_brand":[142],"class_list":["post-10578","post","type-post","status-publish","format-standard","hentry","category-dc-dc-converters","category-integrated-circuits-ics","tag-l5973d013tr","chip_brand-st"],"acf":{"brief_explanation":"2.5A step-down buck regulator, 4-36V input, 1.235-35V output, 250kHz, HSOP-8","date_code":"","package_case":"HSOP-8 with exposed pad (5.0 x 6.2 x 1.75 mm)","in_stock":12050,"datasheet":"https:\/\/www.st.com\/resource\/en\/datasheet\/l5973d.pdf","price":"$2.51 @ 1 unit","product_introduction":"The L5973D013TR is a step-down monolithic power switching regulator from STMicroelectronics capable of delivering more than 2A DC current to the load. The device uses an internal P-channel D-MOS transistor with a typical Rds(on) of 250 m\u03a9 as the switching element, minimizing external component size. The output voltage is adjustable from 1.235V to 35V. A minimum input voltage of 4V makes it particularly suitable for 5V bus applications. The HSOP-8 package with exposed pad reduces thermal resistance to approximately 40\u00b0C\/W, enabling high-current operation without external heat sinking. The L5973D013TR is the tape & reel packaged version of the L5973D.","working_principle":"The L5973D operates through four key subsystems:\n\n1. Power Stage: An internal P-channel D-MOS transistor switches the input voltage to an external LC filter. The transistor has a typical Rds(on) of 250 m\u03a9. The device supports 100% duty cycle operation for low dropout conditions.\n\n2. Control Loop: A transconductance error amplifier compares the feedback voltage (FB pin) with an internal 1.235V bandgap reference. The error signal modulates the PWM comparator, which sets the duty cycle. Voltage feedforward compensates for input voltage variations, ensuring constant loop gain.\n\n3. Oscillator & Synchronization: An internal sawtooth oscillator generates the 250 kHz switching frequency. The SYNC pin allows external synchronization up to 500 kHz or master-slave configuration of multiple regulators.\n\n4. Protection Circuits: Pulse-by-pulse current limiting protects against overloads, while a frequency foldback mechanism reduces switching frequency under severe short-circuit conditions. Thermal shutdown disables the device if junction temperature exceeds safe limits. An INH pin enables zero-current standby mode.","pin_description":"
      Pin<\/th>Name<\/th>Type<\/th>Function<\/th><\/tr>
      1<\/td>OUT<\/td>Output<\/td>Regulator output (connect to inductor)<\/td><\/tr>
      2<\/td>SYNC<\/td>I\/O<\/td>Master\/slave synchronization<\/td><\/tr>
      3<\/td>INH<\/td>Input<\/td>Inhibit (active high, ground to enable)<\/td><\/tr>
      4<\/td>COMP<\/td>Output<\/td>Error amplifier output for frequency compensation<\/td><\/tr>
      5<\/td>FB<\/td>Input<\/td>Feedback input (1.235V reference)<\/td><\/tr>
      6<\/td>VREF<\/td>Output<\/td>3.3V reference voltage (no cap needed)<\/td><\/tr>
      7<\/td>GND<\/td>Power<\/td>Ground<\/td><\/tr>
      8<\/td>VCC<\/td>Power<\/td>Unregulated DC input voltage (4\u201336V)<\/td><\/tr><\/table>","application_scenarios":"
      • 5V bus converters: Step-down from 5V or 12V rails in computing and telecom equipment with up to 2A output<\/li>
      • Industrial control systems: Adjustable output from 1.235V to 35V for sensors, actuators, and MCU power rails<\/li>
      • Battery chargers: Wide input range (4\u201336V) accommodates various battery chemistries and wall adapters<\/li>
      • LED driver power: Constant voltage front-end for LED strings with thermal shutdown protection<\/li>
      • Automotive auxiliary power: 12V to 5V\/3.3V conversion with 100% duty cycle dropout operation<\/li><\/ul>","alternative_models":"
        Manufacturer<\/th>Part Number<\/th>Package<\/th>Notes<\/th><\/tr>
        STMicroelectronics<\/td>L5973D<\/td>HSOP-8 EP<\/td>Tube-packed version of same device<\/td><\/tr>
        STMicroelectronics<\/td>A5974D<\/td>HSOP-8 EP<\/td>Parametric equivalent, 2.5A<\/td><\/tr>
        Texas Instruments<\/td>LM2596S-5.0<\/td>TO-263-5<\/td>3A buck, 150 kHz, larger package<\/td><\/tr>
        onsemi<\/td>NCV2575D2T5R4G<\/td>DDPAK-5<\/td>1.5A automotive buck regulator<\/td><\/tr>
        Monolithic Power<\/td>MP1584EN<\/td>SOIC-8<\/td>3A, 1.5 MHz, smaller external components<\/td><\/tr>
        Diodes Inc<\/td>AP1501-50K5G-13<\/td>TO-252-5<\/td>3A, 150 kHz, low-cost alternative<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/ic-vendor.com\/ar\/wp-json\/wp\/v2\/posts\/10578","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ic-vendor.com\/ar\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ic-vendor.com\/ar\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ic-vendor.com\/ar\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/ic-vendor.com\/ar\/wp-json\/wp\/v2\/comments?post=10578"}],"version-history":[{"count":0,"href":"https:\/\/ic-vendor.com\/ar\/wp-json\/wp\/v2\/posts\/10578\/revisions"}],"wp:attachment":[{"href":"https:\/\/ic-vendor.com\/ar\/wp-json\/wp\/v2\/media?parent=10578"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ic-vendor.com\/ar\/wp-json\/wp\/v2\/categories?post=10578"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ic-vendor.com\/ar\/wp-json\/wp\/v2\/tags?post=10578"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/ic-vendor.com\/ar\/wp-json\/wp\/v2\/chip_brand?post=10578"}],"curies":[{"name":"\u062f\u0628\u0644\u064a\u0648 \u0628\u064a","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}