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Integrated buck driver reduces part count

Posted: 01 Mar 2010 ?? ?Print Version ?Bookmark and Share

Keywords:buck driver? MOSFET? controller?

UCD7242 buck driver

Texas Instruments Inc. has launched a digital power dual synchronous-buck driver with integrated power MOSFETs, protection blocks and monitoring features, which help save board space and reduce component count by as much as 80 percent compared to industry standards.

The UCD7242 provides designers the flexibility of two independent 10A rails or one 20A rail in a small package. The highly accurate on-die current sensing element eliminates the need for calibration or temperature compensation. The UCD7242's input voltage range of 2.2V to 18V supports a variety of applications, such as testing and instrumentation, telecommunications, merchant power supplies, and motherboards with multiple points of load.

TI's easy-to-use Fusion Digital Power Designer GUI allows the designer to easily enable the UCD7242's features when paired with a UCD9xxx controller. The free, downloadable tool simplifies the development process and speeds time-to-market by allowing the designer to configure all device parameters in minutes.

The UCD7242's matched drivers and MOSFETs are capable of driving either two outputs at 10A each or one 20A output, ranging from 2.2V to 18V, and 300kHz to 2MHz, providing design flexibility.

The device saves space, component count, and design time by integrating high-side MOSFETs, low-side MOSFETs, drivers, current sensing circuitry, temperature sensing circuitry, and necessary protection functions into a small 6mm x 6mm QFN package.

The UCD7242's advanced monitoring, including accurate current monitoring outputs (5 percent) and a temperature monitoring output, reduces part count, increases reliability and speeds time to market.

The accurate current limit (3.3 percent), thermal shutdown, and separate flag per channel protect the power stage system.

A dedicated control signal for switching off the low-side MOSFET of each channel makes the UCD7242 highly efficient, even under low load conditions.

The UCD7242 is available now in a QFN-32 package and is priced at $2.65 in quantities of 1,000.





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