The XD9267 and XD9268 series of AEC-Q100-compliant synchronous step-down DC/DC converters are designed to meet the demands of automotive designers as increased use of electronic components shifts from LDO to DC/DC to reduce electrical power consumption. At the same time, there is a need to reduce the space occupied, and a demand for small packages. The 600mA synchronous step-down DC/DC converters with an internal 36V operation driver transistor are power supply ICs that meet the needs of this market, says the company.

The input voltage range is 3.0 to 36.0V (absolute maximum rating 40V) and the output voltage range is 1.0 to 25.0V. The oscillation frequency is 2.2MHz. For the operation mode, PWM control can be selected on the XD9267 or PWM/PFM automatic switching control can be selected on the XD9268 to achieve high efficiency and a low ripple voltage over a wide load range. Switching from a regulator to the light load (1mA) efficiency of 82% and the world’s smallest 36V synchronous step-down DC/DC converter improves efficiency and reduces the mounted surface area by 50%.

The soft-start time is internally set to 2.0ms (typical) and can be adjusted to set a longer time using resistor and capacitor. Over-current limiting, under-voltage lockout and thermal shutdown are internal protective functions. In addition, the output state can be monitored using the converters’ power-good function.

The converters are available in an SOT-89-5 package or the small USP-6C package (1.8 x 2.0 x 0.6mm).