AEC-Q100 Compliant, 18V Operation Ultra-small Package Coil-integrated Step-down DC/DC Converters XDL603/XDL604 series

Torex Semiconductor Ltd. (Tokyo Japan: President, Koji Shibamiya, 6616: 1st section at Tokyo Stock Exchange) has launched the XDL603/XDL604 series of AEC-Q100 compliant, ultra-small step-down “micro DC/DC” converters which have an integrated coil and control IC.

A DC/DC converter power supply circuit can be constructed simply by adding a ceramic capacitor and a resistance for voltage setting to the external components, which can contribute to substantially reducing space requirements for board areas and shortening development periods. Also, the internal incorporation of the coil simplifies board layout, making it possible to minimize radiation noise and problems with circuit operation.

An input voltage of 3.0V to 36V (absolute maximum ratings 40V) with a switching frequency of 2.2MHz, 0.75V standard voltage supply are built-in, and the output voltage can be set from 1.8V to 5.0V with an external resistance. The control system can be selected from PWM control (XDL605) or PWM/PFM automatic switching control (XDL606).

The soft-start time has been internally set to 1.0ms (TYP.), but can be optionally set to any desired value by connecting a resistance and capacity to the EN/SS pin, and the power good function makes it possible to monitor the status of the output voltage. Sequence control can be performed with a combination of the soft-start time and power good function.

The coil and control IC are encapsulated in a DFN3625-11B ultra-small leadless package (outside dimensions: 2.5 x 3.6 x h1.55mm) (Figure 1), making these products among the world’s smallest class of coil-integrated DC/DCs compliant with AEC-Q100. Furthermore, the package uses a wettable flank structure, and fillets are formed at the side of the terminal by this, allowing automatic visual inspections of solder joints to be performed.

With the release of XDL603/XDL604 series, the product lines of DC/DC converters with integrated coils for automobiles are 5.5V (XDL601/XDL602), 18V (XDL603/XDL604) and 36V (XDL605/XDL606).XDL603/XDL604 series also has a variation of conventional DC/DC converters with an external coil which are XD9263/XD9264 series. With two different solutions available of stand-alone DC/DCs and coil-integrated, customers can select the best solution to match their own unique applications.

Fig1. 「DFN3625-11B」Package (2.5x3.6xh1.55mm)