3A, 18V, 700kHz ACOT® Synchronous Step-Down Converter

The RT7278 is a synchronous DC/DC step-down converter with Advanced Constant On-Time (ACOT^TM) mode control. It achieves high power density to deliver up to 3A output current from a 4.5V to 18V input supply. The proprietary ACOT^TM mode offers an optimal transient response over a wide range of loads and all kinds of ceramic capacitors, which allows the device to adopt very low ESR output capacitors for ensuring performance stabilization. In addition, RT7278 keeps an excellent constant switching frequency under line and load variation and the integrated synchronous power switches with the ACOT^TM mode operation provides high efficiency in whole output current load range. Cycle-by-cycle current limit provides an accurate protection by a valley detection of low side MOSFET and external soft-start setting eliminates input current surge during startup. Protection functions also include output under voltage protection, output over voltage protection, and thermal shutdown.