{"id":3357,"date":"2026-06-03T04:18:06","date_gmt":"2026-06-03T04:18:06","guid":{"rendered":"https:\/\/materialparts.com\/rt6254ahgj6f\/"},"modified":"2026-06-03T04:18:06","modified_gmt":"2026-06-03T04:18:06","slug":"rt6254ahgj6f","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/rt6254ahgj6f\/","title":{"rendered":"RT6254AHGJ6F"},"content":{"rendered":"

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

The RT6254AHGJ6F from Richtek Technology is a 4A, 4.5V to 18V, 500kHz ACOT synchronous step-down converter in a TSOT-23-6 (FC) package. It features Advanced Constant On-Time (ACOT) control for ultrafast transient response, integrated 48mOhm\/25mOhm MOSFETs, and 115uA quiescent current.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n
\u8f93\u5165\u7535\u538b\u8303\u56f4<\/td>\n4.5V to 18V<\/td>\n<\/tr>\n
Output Voltage Range<\/td>\n0.6V to 5V (adjustable)<\/td>\n<\/tr>\n
\u8f93\u51fa\u7535\u6d41<\/td>\n4A maximum<\/td>\n<\/tr>\n
\u5f00\u5173\u9891\u7387<\/td>\n500kHz<\/td>\n<\/tr>\n
High-Side RDS(on)<\/td>\n48mOhm typical<\/td>\n<\/tr>\n
Low-Side RDS(on)<\/td>\n25mOhm typical<\/td>\n<\/tr>\n
\u9759\u6001\u7535\u6d41<\/td>\n115uA typical<\/td>\n<\/tr>\n
Current Limit<\/td>\n6.2A typical<\/td>\n<\/tr>\n
\u8f6f\u542f\u52a8<\/td>\n1.5ms internal<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n-40 to 85 C<\/td>\n<\/tr>\n
\u5305\u88c5<\/td>\nTSOT-23-6 (FC)<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • ACOT control architecture for ultrafast transient<\/li>\n
  • 4.5V to 18V wide input range<\/li>\n
  • 4A output current<\/li>\n
  • Integrated 48mOhm\/25mOhm MOSFETs<\/li>\n
  • 500kHz nearly constant switching frequency<\/li>\n
  • 115uA quiescent current<\/li>\n
  • Power-save mode at light load<\/li>\n
  • Power good indicator<\/li>\n
  • Internal soft-start (1.5ms)<\/li>\n
  • Cycle-by-cycle current limit<\/li>\n
  • UVP, UVLO, and OTP protection<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • Set-top boxes<\/li>\n
    • Portable TV<\/li>\n
    • Access point routers<\/li>\n
    • DSL modems<\/li>\n
    • LCD TV power supplies<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The RT6254AHGJ6F from Richtek Technology is a 4A, 4.5V to 18V, 500kHz ACOT synchronous step-down converter in a TSOT-23-6 (FC) package. It features Advanced Constant On-Time (ACOT) control for ultrafast transient response, integrated 48mOhm\/25mOhm MOSFETs, and 115uA quiescent current. Key Specifications Input Voltage Range 4.5V to 18V Output Voltage Range 0.6V to 5V […]<\/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":[203],"class_list":["post-3357","post","type-post","status-publish","format-standard","hentry","category-dc-dc-converters","category-integrated-circuits-ics","chip_brand-richtek"],"acf":{"brief_explanation":"4A 18V ACOT sync buck, 48\/25mOhm FETs, 500kHz, TSOT-23-6","date_code":"","package_case":"TSOT-23-6 (FC) (2.9 x 1.6 x 0.9 mm, 0.95mm pitch, flip-chip)","in_stock":5805,"datasheet":"https:\/\/www.richtek.com\/assets\/product_file\/RT6254A=RT6254B\/DS6254AB-05.pdf","price":"$0.48 @ 1ku","product_introduction":"The RT6254AHGJ6F from Richtek is a 4.5-18V, 4A synchronous step-down converter using ACOT control in TSOT-23-6 (FC). Integrated 48mOhm\/25mOhm MOSFETs provide high efficiency with 115uA quiescent current. ACOT architecture delivers ultrafast transient response while maintaining nearly constant 500kHz switching frequency. Features include power-save mode, power good, hiccup OCP, UVP, UVLO, and thermal shutdown.","working_principle":"Uses Richtek's ACOT (Advanced Constant On-Time) control architecture. Unlike traditional constant on-time, ACOT adds an internal compensator that adjusts the on-time to maintain nearly constant switching frequency across line and load. The on-time modulator responds within one switching cycle to load transients, providing faster response than fixed-frequency current-mode controllers. At light loads, the device enters power-save mode (PSM) by skipping pulses to maintain efficiency.","pin_description":"
      Pin<\/th>Name<\/th>Type<\/th>Function<\/th><\/tr>
      1<\/td>EN<\/td>Input<\/td>Enable control (active high)<\/td><\/tr>
      2<\/td>VIN<\/td>Power<\/td>Input supply (4.5-18V)<\/td><\/tr>
      3<\/td>GND<\/td>Ground<\/td>Power and signal ground<\/td><\/tr>
      4<\/td>LX<\/td>Output<\/td>Switch node (inductor connection)<\/td><\/tr>
      5<\/td>BOOT<\/td>Power<\/td>Bootstrap capacitor for high-side driver<\/td><\/tr>
      6<\/td>FB<\/td>Input<\/td>Feedback voltage (0.6V reference)<\/td><\/tr><\/table>","application_scenarios":"
      • 12V to 3.3V\/5V step-down for set-top box and router<\/li>
      • LCD TV 12V to logic rail conversion<\/li>
      • DSL modem POL power supply<\/li>
      • Portable TV battery-powered buck regulator<\/li>
      • General-purpose 4A buck from 5-18V input<\/li><\/ul>","alternative_models":"
        Manufacturer<\/th>Part Number<\/th>Package<\/th>Notes<\/th><\/tr>
        Richtek<\/td>RT6254BHGJ6F<\/td>TSOT-23-6<\/td>Variant with different PSM threshold<\/td><\/tr>
        MPS<\/td>MP1470GJ-Z<\/td>TSOT-23-6<\/td>2A, 16V, similar package<\/td><\/tr>
        TI<\/td>TPS565201DDCR<\/td>SOT-23-THIN<\/td>5A, 17V, higher current<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/3357","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=3357"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/3357\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=3357"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=3357"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=3357"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=3357"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}