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High-speed gate drivers come in compact form

Posted: 03 Dec 2007 ?? ?Print Version ?Bookmark and Share

Keywords:gate driver? power supply design? CMOS?

Fairchild Semiconductor has introduced the FAN31xx and FAN32xx high-speed low-side gate drivers that offer maximum flexibility for power supply designs, providing a wide selection of features and packaging to create compact, highly efficient and reliable power supplies.

Available in either the smallest MLP packaging or industry-standard SOT and SOIC packaging, this broad portfolio of gate drivers expands the options available in the market. With the additional flexibility offered by input-threshold and package choices, two inputs per channel, plus a higher voltage range, short propagation delays, and delay matching between channels, power-supply designs can be further optimized in terms of efficiency, reliability, power density and cost.

The devices come in 2mm x 2mm and 3mm x 3mm MLP with a choice of TTL or CMOS input thresholds for circuit compatibility. The FAN31xx/32xx series also has short and well-controlled time delays for 1MHz+ switching, paralleling drives, and optimizing drive timing to maximize efficiency. In addition, the series offers rugged and high reliability operation with higher maximum operating voltage of 18V, reverse current capability of at least 500mA and HBM ESD rating of 4kV or higher.

The series of high-speed low-side gate drivers consist of the FAN3100 single 2A gate drivers, and the FAN32xx family of dual 2A and 4A gate drivers. These products are specialized amplifiers that drive the gate of a switching power MOSFET or IGBT to quickly turn it on or off according to the input signal. The dual drivers feature matched internal propagation delays between the two channels for applications such as synchronous rectifiers with critical timing needs. This matched internal propagation delay also enables a designer to connect the two channels in parallel, doubling the current capability for driving a single MOSFET.

These additions to our gate driver portfolio are part of a suite of power solutions from Fairchild for high-efficiency, low-standby power AC/DC switch-mode power supplies and high-performance isolated DC/DC power converters.

These low-side gate drivers utilize a Pb-free finish and have been characterized for moisture sensitivity in accordance with the Pb-free reflow requirements of the joint IPC/JEDEC standard J-STD-020. All of Fairchild's products are designed to meet the requirements of the European Union's RoHS directive.

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