With the increased use of electronic components in automobiles in recent years, a shift from LDO to DC/DC has begun to reduce electrical power consumption. Further, the increasing need to reduce the space used is expanding the demand for small packages. The newly developed XD9267/XD9268 Series 600 mA synchronous step-down DC/DC converters with an internal 36 V operation driver transistor are power supply ICs that meet the needs of this market.
The input voltage range is 3.0 V to 36.0 V (absolute maximum rating 40 V), the output voltage range is 1.0 V to 25.0 V, and the oscillation frequency is 2.2 MHz. For the operation mode, PWM control (XD9267) or PWM/PFM automatic switching control (XD9268) can be selected to achieve high efficiency and a low ripple voltage over a wide load range from light to heavy loads. Switching from a regulator to the light load (1 mA) efficiency of 82% and the world’s smallest 36 V synchronous step-down DC/DC converter means greatly improving efficiency by half and significantly reducing the mounted surface area by 50%.
The soft-start time is internally set to 2.0 ms (typ.), but can be adjusted to set a longer time using resistor and capacitor. Over-current limiting, UVLO, and thermal shutdown are available as internal protective functions. In addition, the output state can be monitored using the power good function.
The SOT-89-5 package or the small USP-6C package (1.8 × 2.0 × h0.6 mm) is optional to match the application.
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