{"id":6590,"date":"2026-06-18T15:27:25","date_gmt":"2026-06-18T15:27:25","guid":{"rendered":"https:\/\/materialparts.com\/bl9342blb\/"},"modified":"2026-06-18T15:27:25","modified_gmt":"2026-06-18T15:27:25","slug":"bl9342blb","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/bl9342blb\/","title":{"rendered":"BL9342BLB"},"content":{"rendered":"

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

The BL9342BLB is a 40V, 600mA high-frequency step-down switching regulator from Shanghai Belling. It integrates an internal high-side power MOSFET with current mode control for fast loop response. Operating at 1.8 MHz switching frequency over a 4.2V to 40V input range, it is available in a compact SOT-23-6L package for space-constrained power conversion applications.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n
\u62d3\u6251\u7ed3\u6784<\/td>\nNon-synchronous Buck<\/td>\n<\/tr>\n
\u8f93\u5165\u7535\u538b\u8303\u56f4<\/td>\n4.2V to 40V<\/td>\n<\/tr>\n
\u8f93\u51fa\u7535\u6d41<\/td>\n600 mA<\/td>\n<\/tr>\n
\u5f00\u5173\u9891\u7387<\/td>\n1.8 MHz<\/td>\n<\/tr>\n
Internal MOSFET RDS(ON)<\/td>\n500 m\u03a9<\/td>\n<\/tr>\n
Reference Voltage<\/td>\n0.8V<\/td>\n<\/tr>\n
\u9759\u6001\u7535\u6d41<\/td>\n200 \u00b5A (typical)<\/td>\n<\/tr>\n
\u5173\u673a\u7535\u6d41<\/td>\n3 \u00b5A (typical)<\/td>\n<\/tr>\n
Current Limit<\/td>\n1A<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n-40\u00b0C to +125\u00b0C<\/td>\n<\/tr>\n
\u5305\u88c5<\/td>\nSOT-23-6L<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • Wide input voltage range: 4.2V to 40V<\/li>\n
  • 1.8 MHz fixed switching frequency<\/li>\n
  • Internal 500 m\u03a9 high-side MOSFET<\/li>\n
  • Internal soft-start (0.5 ms)<\/li>\n
  • Precision current limit without sensing resistor<\/li>\n
  • Thermal shutdown at 150\u00b0C<\/li>\n
  • Internal compensation for easy design<\/li>\n
  • Stable with ceramic output capacitors<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • High-voltage industrial power conversion<\/li>\n
    • Power meter and smart grid equipment<\/li>\n
    • Battery-powered system regulation<\/li>\n
    • Automotive auxiliary power supplies<\/li>\n
    • LED driver and general lighting<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The BL9342BLB is a 40V, 600mA high-frequency step-down switching regulator from Shanghai Belling. It integrates an internal high-side power MOSFET with current mode control for fast loop response. Operating at 1.8 MHz switching frequency over a 4.2V to 40V input range, it is available in a compact SOT-23-6L package for space-constrained power conversion […]<\/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":[293],"class_list":["post-6590","post","type-post","status-publish","format-standard","hentry","category-dc-dc-converters","category-integrated-circuits-ics","chip_brand-belling"],"acf":{"brief_explanation":"Non-sync Buck DC-DC, 600mA, 4.2-40V input, 1.8MHz, SOT-23-6L","date_code":"","package_case":"SOT-23-6L (2.9\u00d71.6\u00d71.1 mm)","in_stock":5467,"datasheet":"https:\/\/file.elecfans.com\/web1\/M00\/E6\/52\/pIYBAGBUX46AJyM3AAPOgL1qvwE644.pdf","price":"$0.10 @ 1ku","product_introduction":"The BL9342BLB from Shanghai Belling is a high-frequency step-down switching regulator with integrated 500 m\u03a9 high-side MOSFET. It supports input voltages from 4.2V to 40V and delivers up to 600 mA output. The 1.8 MHz switching frequency enables compact external components, while internal soft-start, compensation, and precision current limit simplify design. Its wide input range makes it suitable for industrial, automotive, and battery-powered applications.","working_principle":"The BL9342BLB operates as a current-mode non-synchronous buck converter. An internal high-side NMOS switch controls energy transfer to the output inductor, while an external Schottky diode acts as the freewheeling element. Current-mode control provides fast transient response and cycle-by-cycle current limiting. The error amplifier compares the FB pin voltage (sensed via external resistor divider) with the 0.8V internal reference to regulate the PWM duty cycle. Internal soft-start gradually ramps the output voltage. Frequency foldback at light loads maintains efficiency while thermal shutdown protects against overheating.","pin_description":"\n
      Pin<\/th>Name<\/th>Type<\/th>Function<\/th><\/tr>\n
      1<\/td>BST<\/td>Input<\/td>Bootstrap supply for high-side driver<\/td><\/tr>\n
      2<\/td>GND<\/td>Power<\/td>Ground<\/td><\/tr>\n
      3<\/td>FB<\/td>Input<\/td>Output feedback (Vout=0.8\u00d7(1+R1\/R2))<\/td><\/tr>\n
      4<\/td>EN<\/td>Input<\/td>Enable control (float to disable)<\/td><\/tr>\n
      5<\/td>VIN<\/td>Input<\/td>Input supply (4.2-40V)<\/td><\/tr>\n
      6<\/td>SW<\/td>Output<\/td>Switch node (connect to inductor and diode)<\/td><\/tr>\n<\/table>","application_scenarios":"
        \n
      • Industrial power systems requiring wide input voltage range<\/li>\n
      • Smart meter and power grid equipment auxiliary power<\/li>\n
      • Battery-powered systems with 12V\/24V input rails<\/li>\n
      • Automotive accessory power conversion<\/li>\n
      • General lighting and LED driver buck regulation<\/li>\n<\/ul>","alternative_models":"\n
        Manufacturer<\/th>Part Number<\/th>Package<\/th>Notes<\/th><\/tr>\n
        TI<\/td>LMR16006XDDCR<\/td>SOT-23-6<\/td>600mA, 4-60V input, similar pinout<\/td><\/tr>\n
        MPS<\/td>MP8759<\/td>QFN-12<\/td>Higher current, wider input range<\/td><\/tr>\n
        Monolithic Power<\/td>MP4581DN<\/td>SOIC-8<\/td>500mA, 4.5-55V input<\/td><\/tr>\n
        onsemi<\/td>NCP3170BDR2G<\/td>SOIC-8<\/td>1A, 4.5-18V input<\/td><\/tr>\n
        Belling<\/td>BL9340BLB<\/td>SOT-23-6L<\/td>Higher current version<\/td><\/tr>\n<\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/6590","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=6590"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/6590\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=6590"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=6590"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=6590"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=6590"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}