AP61402Q: Automotive-Grade 4 A Synchronous Buck Converter

The AP61402Q from Diodes Incorporated is a high-efficiency, automotive-compliant synchronous buck converter designed to deliver up to 4 A continuous output current across a wide input voltage range of 2.3 V to 5.5 V. Engineered for compact and thermally constrained environments, it integrates a 75 mΩ high-side and a 33 mΩ low-side power MOSFET, enabling efficient step-down DC/DC conversion. The device utilizes constant on-time (COT) control for fast transient response, low output ripple, and simplified loop compensation. With selectable pulse-frequency modulation (PFM) and pulse-width modulation (PWM) modes, the AP61402Q optimizes performance across varying load conditions. Its proprietary gate driver design minimizes EMI without compromising switching performance. Fully AEC-Q100 qualified and PPAP capable, the AP61402Q is ideal for automotive applications, including infotainment, instrument clusters, and ADAS. It is housed in a compact V-DFN1515-6/SWP (Type UX) package and includes comprehensive protection features like undervoltage lockout, overvoltage protection (OVP), current limiting, and thermal shutdown.