Buck controller drives DrMOS power devices

Edited by the Electronicstalk editorial team Feb 27, 2007

The SC2447 is a 1MHz synchronous PWM buck controller designed to drive DrMOS power devices in compact, high-efficiency DC/DC power convertors.

Semtech Corp has announced the SC2447, the industry's first DC/DC step-down (buck) controller for DrMOS power devices.

The SC2447 is a 1MHz synchronous PWM buck controller designed to drive DrMOS power devices in compact, high-efficiency DC/DC power convertors for telecomms, datacomms, switches, routers, and other high-end applications.

The dual-channel SC2447 can produce two independent outputs of up to 30A each or a single high-current output up to 60A.

A DrMOS replaces a synchronous MOSFET driver IC and a pair of power MOSFETs, offering higher switching frequency and higher efficiency, resulting in better thermal performances and higher system reliability.

It is the next-generation power technology for high-current power convertors.

"The use of DrMOS promises to make it much easier for a design engineer to build power convertors that meets today's stringent demands for efficiency and fast and flexible designs", said Liu Yang, Director of Marketing for Semtech's Power Management Telecom Division.

"The dual power output and high switching frequency of the SC2447 make it ideally suited for the compact and leading-edge power convertor designs that leverage DrMOS technology".

The SC2447 incorporates soft-start/enable pins for each output and 180-degree out-of-phase operation that minimises the input current ripple and enables the use of smaller input filter capacitors which reduce the size and cost of the total design.

The device can be started into a pre-biasing output.

It also features hiccup overload protection, which protects the convertor from overload damage and automatically returns to normal operation when overload condition is removed.

The SC2447 is provided in a 28-lead TSSOP package that is lead-free and meets RoHS and WEEE environmental standards.

The SC2447 is available immediately in production quantities and is priced at US $1.95 each in 1000-piece lots.