{"id":10711,"date":"2026-07-20T10:41:49","date_gmt":"2026-07-20T10:41:49","guid":{"rendered":"https:\/\/ic-vendor.com\/lm5119psqx-nopb\/"},"modified":"2026-07-20T10:41:49","modified_gmt":"2026-07-20T10:41:49","slug":"lm5119psqx-nopb","status":"publish","type":"post","link":"https:\/\/ic-vendor.com\/zh\/lm5119psqx-nopb\/","title":{"rendered":"LM5119PSQX\/NOPB"},"content":{"rendered":"

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

The LM5119PSQX\/NOPB is a dual 5 A, current mode synchronous buck controller from Texas Instruments. Packaged in a 20-pin WQFN (SQP), it operates from an input range of 3 V to 100 V, making it ideal for high-voltage industrial and automotive power conversion. The device features emulated current mode control, adjustable switching frequency up to 1 MHz, and independent enable and soft-start for each channel.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n
\u62d3\u6251\u7ed3\u6784<\/td>\nDual Synchronous Buck Controller<\/td>\n<\/tr>\n
\u8f93\u5165\u7535\u538b\u8303\u56f4<\/td>\n3 V to 100 V<\/td>\n<\/tr>\n
\u8f93\u51fa\u7535\u6d41<\/td>\n5 A per channel (external MOSFETs)<\/td>\n<\/tr>\n
\u5f00\u5173\u9891\u7387<\/td>\n50 kHz to 1 MHz (adjustable)<\/td>\n<\/tr>\n
\u63a7\u5236\u6a21\u5f0f<\/td>\nEmulated Current Mode<\/td>\n<\/tr>\n
\u5305\u88c5<\/td>\n20-WQFN (SQP) \u2014 4.0 x 4.0 mm<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n-40\u00b0C to +125\u00b0C<\/td>\n<\/tr>\n
Duty Cycle<\/td>\nUp to 95%<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • Wide 3-V to 100-V input voltage range for industrial and automotive systems<\/li>\n
  • Emulated current mode control with cycle-by-cycle current limit<\/li>\n
  • Dual output with 180\u00b0 out-of-phase operation for reduced input capacitance<\/li>\n
  • Independent enable, soft-start, and current limit for each channel<\/li>\n
  • Synchronization input for multi-chip phase interleaving<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • Industrial 24 V and 48 V power distribution<\/li>\n
    • Automotive battery-powered DC-DC conversion<\/li>\n
    • FPGA and DSP core and I\/O power supplies<\/li>\n
    • Telecom and networking equipment power<\/li>\n
    • Motor drive and LED lighting power supplies<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The LM5119PSQX\/NOPB is a dual 5 A, current mode synchronous buck controller from Texas Instruments. Packaged in a 20-pin WQFN (SQP), it operates from an input range of 3 V to 100 V, making it ideal for high-voltage industrial and automotive power conversion. The device features emulated current mode control, adjustable switching frequency […]<\/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":[2051],"chip_brand":[138],"class_list":["post-10711","post","type-post","status-publish","format-standard","hentry","category-dc-dc-converters","category-integrated-circuits-ics","tag-lm5119psqx-nopb","chip_brand-ti"],"acf":{"brief_explanation":"Dual 5 A sync buck controller, 3\u2013100 V input, emulated current mode, 20-WQFN, automotive","date_code":"","package_case":"20-WQFN (SQP) \u2014 4.0 x 4.0 mm","in_stock":10017,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/lm5119.pdf","price":"$3.29 @ 1ku","product_introduction":"The LM5119 is a dual synchronous buck controller from Texas Instruments designed for high-voltage industrial and automotive power conversion applications. It operates from an input voltage range of 3 V to 100 V, driving external N-channel MOSFETs for each output channel. The emulated current mode control provides excellent transient response and cycle-by-cycle current limiting without the need for external current sense resistors. The two outputs operate 180\u00b0 out of phase to minimize input ripple current and reduce input capacitor requirements. Independent enable, soft-start, and current limit functions allow flexible power sequencing.","working_principle":"The LM5119 uses an emulated current mode control architecture that reconstructs the inductor current ramp internally, eliminating the need for external current sensing networks. The high-side MOSFET current is sensed through its RDS(on) or an external sense resistor, and the current information is used for both regulation and cycle-by-cycle current limiting. The error amplifier compares the output voltage feedback against a precision reference (0.8 V) and generates a control signal for the PWM comparator. The two channels operate 180\u00b0 out of phase, effectively doubling the input ripple frequency and reducing the required input capacitance. An internal VCC regulator provides bias from the high-voltage input.","pin_description":"
      Pin<\/th>Name<\/th>Type<\/th>Function<\/th><\/tr>
      1<\/td>VIN<\/td>Input<\/td>Input supply voltage (3\u2013100 V)<\/td><\/tr>
      2<\/td>VCC<\/td>Output<\/td>Internal regulator output (bypass with cap)<\/td><\/tr>
      3<\/td>EN1<\/td>Input<\/td>Channel 1 enable<\/td><\/tr>
      4<\/td>SS1<\/td>I\/O<\/td>Channel 1 soft-start (cap to GND)<\/td><\/tr>
      5<\/td>FB1<\/td>Input<\/td>Channel 1 output voltage feedback<\/td><\/tr>
      6<\/td>COMP1<\/td>I\/O<\/td>Channel 1 error amplifier output<\/td><\/tr>
      7<\/td>CS1<\/td>Input<\/td>Channel 1 current sense input<\/td><\/tr>
      8<\/td>AGND<\/td>Power<\/td>Analog ground<\/td><\/tr>
      9<\/td>CS2<\/td>Input<\/td>Channel 2 current sense input<\/td><\/tr>
      10<\/td>COMP2<\/td>I\/O<\/td>Channel 2 error amplifier output<\/td><\/tr>
      11<\/td>FB2<\/td>Input<\/td>Channel 2 output voltage feedback<\/td><\/tr>
      12<\/td>SS2<\/td>I\/O<\/td>Channel 2 soft-start (cap to GND)<\/td><\/tr>
      13<\/td>EN2<\/td>Input<\/td>Channel 2 enable<\/td><\/tr>
      14<\/td>SYNC<\/td>Input<\/td>Frequency synchronization input<\/td><\/tr>
      15<\/td>RT<\/td>I\/O<\/td>Frequency set resistor to GND<\/td><\/tr>
      16<\/td>HO2<\/td>Output<\/td>Channel 2 high-side gate drive<\/td><\/tr>
      17<\/td>SW2<\/td>I\/O<\/td>Channel 2 switch node<\/td><\/tr>
      18<\/td>LO2<\/td>Output<\/td>Channel 2 low-side gate drive<\/td><\/tr>
      19<\/td>PGND<\/td>Power<\/td>Power ground<\/td><\/tr>
      20<\/td>LO1<\/td>Output<\/td>Channel 1 low-side gate drive<\/td><\/tr><\/table>","application_scenarios":"
      • 24 V \/ 48 V industrial bus to logic power conversion<\/li>
      • Automotive 12 V \/ 48 V battery to point-of-load supplies<\/li>
      • Dual-output FPGA core and I\/O voltage generation<\/li>
      • Telecom base station power distribution modules<\/li>
      • Broad-input-range DC-DC converters for LED driver front-ends<\/li><\/ul>","alternative_models":"
        Manufacturer<\/th>Part Number<\/th>Package<\/th>Notes<\/th><\/tr>
        TI<\/td>LM5141RHBR<\/td>28-TSSOP<\/td>Single 100 V sync buck controller<\/td><\/tr>
        TI<\/td>LM5143SQE\/NOPB<\/td>28-WQFN<\/td>Dual 100 V controller, higher integration<\/td><\/tr>
        Analog Devices<\/td>LT8653S<\/td>28-SSOP<\/td>Dual 4 A, 42 V monolithic buck<\/td><\/tr>
        Monolithic Power<\/td>MP3910GS-P<\/td>28-QSOP<\/td>Dual 60 V buck controller<\/td><\/tr>
        Infineon<\/td>IR3651STRPBF<\/td>28-TSSOP<\/td>Dual 60 V buck controller<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/posts\/10711","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/comments?post=10711"}],"version-history":[{"count":0,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/posts\/10711\/revisions"}],"wp:attachment":[{"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/media?parent=10711"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/categories?post=10711"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/tags?post=10711"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=10711"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}