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Step-down DC/DC controller operates up to 30V

Posted: 06 Jun 2013 ?? ?Print Version ?Bookmark and Share

Keywords:DC/DC controller? P-ch MOS driver?

Torex Semiconductor Ltd has unleashed the XC9252 series of 105C step-down DC/DC controllers with 30V operation and a low supply current. Additionally, the device features an input voltage of 30V, a supply current of 30A, input rating of 36V and a peak voltage of 46V for 400ms, detailed the company.

The input voltage range of the device is from 3-30V, and the P-ch MOS driver Tr. is controlled to provide a stable output voltage even when the dropout voltage is small, Torex added. The output voltage can be set to any value from 1.5V up using external resistors (RFB1, RFB2). Moreover, the device operates from -40C up to 105C.

PWM/PFM auto switching control realises high efficiency over the entire load range, from light loads to heavy loads. A low supply current is achieved to increase efficiency at light loads, making this controller ideal for a variety of applications.

The switching frequency can be set to any value from 280-550kHz by connecting an external resistor to the ROSC pin. Using the MODE/SYNC pin, unnecessary noise can be suppressed by synchronising to an external clock within a range of 25 per cent of the internal clock.

The advantages of a controller IC make it possible to satisfy a range of power supply specifications. General purpose products can be selected for the external components as appropriate for the application and the scale of the circuitry can be minimised.

Any value can be set for the soft start time by adding an external capacitor to the SS pin. A UVLO function that forcibly turns off the driver Tr when the input voltage is 2.5V or less is incorporated. As protective circuits, an over-current protection circuit, short-circuit protection circuit and thermal shutdown circuit are incorporated to enable safe use.

This series is an environment-friendly product that complies with the EU RoHS Directive and is Pb-free.

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