{"id":30648,"date":"2025-12-31T09:00:00","date_gmt":"2025-12-31T09:00:00","guid":{"rendered":"https:\/\/www.engineernewsnetwork.com\/blog\/?p=30648"},"modified":"2025-12-04T16:57:19","modified_gmt":"2025-12-04T16:57:19","slug":"5-5v-4a-low-iq-synchronous-buck-converter-with-versatile-i2c-interface","status":"publish","type":"post","link":"https:\/\/www.engineernewsnetwork.com\/blog\/5-5v-4a-low-iq-synchronous-buck-converter-with-versatile-i2c-interface\/","title":{"rendered":"5.5V, 4A, low IQ synchronous Buck converter with versatile I2C Interface"},"content":{"rendered":"\n<p>Diodes Incorporated introduces the\u00a0<a href=\"https:\/\/email.publitek.com\/c\/eJwszkuO8yAQBODTwI6IbjCPBYtsvP7_E0TY3UxQ4seAFV9_5NFsv5KqipI1xJPkBN7ZMPjognwmZ0uYySNxCN5PjJkHLoDT5LKNmGVNLhqIwYGbp0wPgGJo1hhARwjC6l6JX_VbLbm-uXUV3DREsj4MqvT9WG9XIN_peRx7F-YucBQ4nud5o7oR99u8LQLHPbdD4PipfAoc7_8cWO3-y4WpZtX4zbmzqpR-4fEHwtzhemdkS3Utm7Ca16-6MreVz77ycW7tdS3IfjTm5WrA7DUUS8qQccpyNCoYHRQMvgAy-UggPwl_AgAA__83D131\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>AP61406Q<\/strong><\/a>, a new 5.5V, 4A member with I<sup>2<\/sup>C interface of its low quiescent current (I<sub>Q<\/sub>), automotive-compliant synchronous buck converters.<\/p>\n\n\n\n<p>The I<sup>2<\/sup>C interface allows the programming of various parameters enabling it to meet the growing demand for compact design and high efficiency in various automotive point-of-load (POL) applications, including infotainment, instrument clusters, telematics, and advanced driver assistance systems (ADAS).<\/p>\n\n\n\n<p>A key advantage of the AP61406Q&nbsp;is its I<sup>2<\/sup>C 3.0-compatible serial interface, which supports SCL clock rates up to 3.4MHz. This interface enables programmability for various parameters, including PFM\/PWM modes, frequencies (1MHz, 1.5MHz, 2MHz, 2.5MHz), and output currents (1A\/2A\/3A\/4A). The device also provides 20mV increment V<sub>OUT<\/sub>&nbsp;adjustability and provides fault status reports.<\/p>\n\n\n\n<p>Optimized for high power density automotive POL applications, the AP61406Q is available in a W-QFN1520-8\/SWP (Type UX) package, enabling it to operate at high ambient temperatures. The device also features a proprietary gate driver scheme that effectively resists switching node ringing without compromising MOSFET turn-on and turn-off times, thereby reducing high frequency radiated EMI noise.<\/p>\n\n\n\n<p>The AP61406Q operates with an input voltage range of 2.3V to 5.5V. It integrates a 75m\u03a9 high-side and a 33m\u03a9 low-side power MOSFET to provide high-efficiency step-down DC-DC conversion. Its adoption of constant on-time (COT) control minimizes external component count, facilitates loop stabilization, and results in low output voltage ripple<\/p>\n\n\n\n<p>The multi-function enable (EN) input also provides control of the mode of operation. This capability enables flexibility for low I<sub>Q<\/sub>&nbsp;(20\u00b5A), high-load efficiency in fixed PFM mode or equal ripple across load conditions in PWM mode. Additional features include an accurate power good (PG) indicator with an internal 5M\u03a9 pull-up resistor with a \u00b15% window comparator circuit, which reduces bill-of-materials (BOM) costs.<\/p>\n\n\n\n<p>The AP61406Q has high-side and low-side current sense protection during output short circuits, increasing its reliability in automotive POL applications. Other protection features include undervoltage lockout (UVLO), V<sub>IN<\/sub>&nbsp;overvoltage protection (OVP), peak and valley current limiting, and thermal shutdown.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Diodes Incorporated introduces the\u00a0AP61406Q, a new 5.5V, 4A member with I2C interface of its low quiescent current (IQ), automotive-compliant synchronous buck converters. The I2C interface allows the programming of various parameters enabling it to meet the growing demand for compact design and high efficiency in various automotive point-of-load (POL) applications, including infotainment, instrument clusters, telematics, &hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[104],"tags":[14135,753],"class_list":["post-30648","post","type-post","status-publish","format-standard","","category-electronics","tag-ap61406q","tag-diodes-incorporated"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>5.5V, 4A, low IQ synchronous Buck converter with versatile I2C Interface - Engineer News Network<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.engineernewsnetwork.com\/blog\/5-5v-4a-low-iq-synchronous-buck-converter-with-versatile-i2c-interface\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"5.5V, 4A, low IQ synchronous Buck converter with versatile I2C Interface - Engineer News Network\" \/>\n<meta property=\"og:description\" content=\"Diodes Incorporated introduces the\u00a0AP61406Q, a new 5.5V, 4A member with I2C interface of its low quiescent current (IQ), automotive-compliant synchronous buck converters. 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