Automotive buck converter is I2C-tuned
Optimized for automotive point-of-load (POL) applications, Diodes’s AP61406Q 5.5-V, 4-A synchronous buck converter provides a versatile I2C programming interface. The I2C 3.0-compatible serial interface supports SCL clock rates up to 3.4 MHz and allows configuration of PFM/PWM modes, switching frequencies (1 MHz, 1.5 MHz, 2 MHz, or 2.5 MHz), and output-current limits of 1A, 2 A, 3 A, and 4 A. The output voltage is adjustable in 20-mV increments.
The AP61406Q uses a proprietary gate-driver scheme to suppress switching-node ringing without slowing MOSFET transitions, helping reduce high-frequency radiated EMI. It operates from an input of 2.3 V to 5.5 V and integrates 75-mΩ high-side and 33-mΩ low-side MOSFETs for efficient step-down conversion. Constant on-time (COT) control further minimizes external components, eases loop stabilization, and delivers low output-voltage ripple.
Offered in a W-QFN1520-8/SWP (Type UX) package, the converter is AEC-Q100 qualified for operation from –40°C to +125°C. Its protection suite—including high-side and low-side current-sense protection, UVLO, VIN OVP, peak and valley current limiting, and thermal shutdown—enhances reliability.
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