{"id":7849,"date":"2026-06-28T02:48:28","date_gmt":"2026-06-28T02:48:28","guid":{"rendered":"https:\/\/materialparts.com\/mc34063adr2g-2\/"},"modified":"2026-06-28T10:20:15","modified_gmt":"2026-06-28T10:20:15","slug":"mc34063adr2g-2","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/mc34063adr2g-2\/","title":{"rendered":"MC34063ADR2G"},"content":{"rendered":"

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

The MC34063ADR2G is a 1.5A DC-DC converter control circuit from onsemi that implements step-up, step-down, and inverting topologies with adjustable output in an SOIC-8 package.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n
\u8f93\u5165\u7535\u538b\u8303\u56f4<\/td>\n3V to 40V<\/td>\n<\/tr>\n
Output Switch Current<\/td>\n1.5A (peak)<\/td>\n<\/tr>\n
\u5f00\u5173\u9891\u7387<\/td>\nup to 100kHz (adjustable)<\/td>\n<\/tr>\n
Output Voltage<\/td>\nAdjustable (set by external resistors)<\/td>\n<\/tr>\n
Reference Voltage<\/td>\n1.25V (2% accuracy)<\/td>\n<\/tr>\n
Switch Saturation Voltage<\/td>\n1.0V typical at 1.5A (Darlington)<\/td>\n<\/tr>\n
Supply Current<\/td>\n2.5mA typical<\/td>\n<\/tr>\n
Duty Cycle Range<\/td>\n0% to 100% (voltage mode)<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n-40\u00b0C to +85\u00b0C<\/td>\n<\/tr>\n
\u5305\u88c5<\/td>\nSOIC-8 (4.9 x 3.9mm)<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • Supports step-up, step-down, and voltage-inverting topologies<\/li>\n
  • 1.5A peak output switch current (internal Darlington)<\/li>\n
  • Adjustable switching frequency via timing capacitor<\/li>\n
  • Precision 1.25V reference voltage (2% accuracy)<\/li>\n
  • Current-limiting via external sense resistor<\/li>\n
  • Low 2.5mA quiescent supply current<\/li>\n
  • Only 5 external components needed for basic converter<\/li>\n
  • Wide 3V to 40V input voltage range<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • Step-up (boost) voltage converters<\/li>\n
    • Step-down (buck) voltage converters<\/li>\n
    • Voltage-inverting converters<\/li>\n
    • Battery-powered DC-DC converters<\/li>\n
    • Automotive and industrial power supplies<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The MC34063ADR2G is a 1.5A DC-DC converter control circuit from onsemi that implements step-up, step-down, and inverting topologies with adjustable output in an SOIC-8 package. Key Specifications Input Voltage Range 3V to 40V Output Switch Current 1.5A (peak) Switching Frequency up to 100kHz (adjustable) Output Voltage Adjustable (set by external resistors) Reference Voltage […]<\/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":[182],"class_list":["post-7849","post","type-post","status-publish","format-standard","hentry","category-dc-dc-converters","category-integrated-circuits-ics","chip_brand-onsemi"],"acf":{"brief_explanation":"1.5A DC-DC controller, boost\/buck\/invert, 3-40V, 100kHz, SOIC-8","date_code":"","package_case":"SOIC-8 (4.9 x 3.9 x 1.5mm, 1.27mm pitch)","in_stock":13400,"datasheet":"https:\/\/www.onsemi.com\/pub\/Collateral\/MC34063A-D.PDF","price":"$0.52 @ 1ku","product_introduction":"The MC34063ADR2G is a monolithic DC-DC converter control circuit from onsemi that contains all the active functions required for step-up, step-down, and voltage-inverting switching converter applications. The device integrates a 1.5A Darlington output switch, oscillator, voltage reference, and comparator in an SOIC-8 package. The switching frequency is set by an external timing capacitor, operating up to 100kHz. The output voltage is set by an external resistor divider referenced to the internal 1.25V precision reference. Current limiting is achieved through an external sense resistor in series with the switch, providing overload protection. With only 5 external components needed for a basic converter, the MC34063A offers one of the simplest and most cost-effective DC-DC converter solutions available.","working_principle":"The MC34063ADR2G uses a fixed-frequency, variable-duty-cycle control scheme. The internal oscillator generates a timing waveform at a frequency determined by the external capacitor on the CT pin (typically 33kHz to 100kHz). During the on-time, the internal Darlington output switch (between pins 1, 2 and 3) conducts, storing energy in the external inductor. During the off-time, the inductor releases stored energy to the output through the external catch diode. The comparator monitors the output voltage via the comparator inverting input (pin 5) and compares it with the 1.25V reference. When the output voltage is below the setpoint, the comparator enables the oscillator output, allowing the switch to toggle. When the output exceeds the setpoint, the comparator inhibits the oscillator, and the switch remains off (skip-cycle mode). This hysteretic control provides stable regulation without the loop compensation required by PWM controllers. The current-sense resistor between VCC and the switch collector provides peak current limiting; when the voltage across it exceeds approximately 300mV, the switch is forced off for the remainder of the cycle. The Darlington switch configuration provides high current gain but introduces a 1.0V typical saturation voltage, which limits efficiency compared to modern MOSFET-based designs.","pin_description":"\n
      Pin<\/th>Name<\/th>Type<\/th>Description<\/th><\/tr>\n
      1<\/td>Switch Collector<\/td>Power<\/td>Darlington switch collector (connect to inductor\/VCC)<\/td><\/tr>\n
      2<\/td>Switch Emitter<\/td>Power<\/td>Darlington switch emitter (connect to ground for buck)<\/td><\/tr>\n
      3<\/td>Timing Capacitor<\/td>Analog<\/td>Oscillator timing capacitor connection<\/td><\/tr>\n
      4<\/td>GND<\/td>Power<\/td>Ground<\/td><\/tr>\n
      5<\/td>Comparator Inverting Input<\/td>Input<\/td>Feedback voltage input (connect to output divider)<\/td><\/tr>\n
      6<\/td>VCC<\/td>Power<\/td>Supply voltage (3V-40V)<\/td><\/tr>\n
      7<\/td>Ipeak Sense<\/td>Input<\/td>Current sense input (300mV threshold)<\/td><\/tr>\n
      8<\/td>Driver Collector<\/td>Power<\/td>Darlington driver collector (connect via resistor)<\/td><\/tr>\n<\/table>","application_scenarios":"
        \n
      • Step-Up Converters:<\/strong> Boost 5V to 12V or 12V to 24V from battery or adapter supplies with minimal external components<\/li>\n
      • Step-Down Converters:<\/strong> Buck 12V or 24V to 5V or 3.3V for microcontroller and logic power in automotive systems<\/li>\n
      • Voltage Inverters:<\/strong> Generate -5V or -12V from positive supply for op-amp bias and LCD contrast<\/li>\n
      • Automotive Power:<\/strong> 3-40V input range handles automotive battery voltage transients without pre-regulation<\/li>\n
      • Low-Cost Solutions:<\/strong> Only 5 external components and sub-$1 cost make it ideal for cost-sensitive consumer applications<\/li>\n<\/ul>","alternative_models":"\n
        Model<\/th>Manufacturer<\/th>Key Difference<\/th>Package<\/th>Specs<\/th><\/tr>\n
        MC34063ADG<\/td>onsemi<\/td>Same in SOIC-8 (tube packaging)<\/td>-<\/td>-<\/td><\/tr>\n
        MC33063ADR2G<\/td>onsemi<\/td>-40\u00b0C to +105\u00b0C extended temp range<\/td>-<\/td>-<\/td><\/tr>\n
        NCV3063DR2G<\/td>onsemi<\/td>Automotive qualified, higher temp, lower Vsat<\/td>-<\/td>-<\/td><\/tr>\n
        LM2576-5.0<\/td>TI<\/td>3A buck regulator, integrated switch, TO-263<\/td>-<\/td>-<\/td><\/tr>\n
        LM2596-5.0<\/td>TI<\/td>3A, 150kHz buck, higher efficiency<\/td>-<\/td>-<\/td><\/tr>\n<\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/7849","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=7849"}],"version-history":[{"count":1,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/7849\/revisions"}],"predecessor-version":[{"id":8288,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/7849\/revisions\/8288"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=7849"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=7849"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=7849"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=7849"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}