Sipex Unveils DC-DC Controller to Power ADSL2+ and ADSL2 SRA Modems
Sipex Corp. announced the SP6138 – a 2.5MHz synchronous dc-dc controller designed to power ADSL2+ and full ADSL2 "SRA" (Seamless Rate Adaptation) modems. By operating above the maximum 2.2MHz ADSL2+ frequency, the SP6138 avoids data interference without the need for additional filtering components. Sipex' designers developed the technology in order to generate minimum on-times of less than 30ns allowing for direct conversion at 2.5MHz from 15V to modem DSP core and I/O voltages. Single supply rail operation from 4.5 to 5.5V or 5 to 24V simplifies design and eliminates the need for additional intermediate rails.
The SP6138 controller 2.5MHz operating frequency combined with loss-less inductor DCR current sensing maximizes response to load transients, minimizes solution size, and reduces overall Bill of Material costs. In addition to ADSL2+, applications such as Automotive GPS Navigation, Satellite Set Top Boxes, and aftermarket Automotive Electronics may find the high operating frequency a good way to avoid AM radio interference while powering the processors used in all of these systems.
The SP6138 offers the designer a unique combination of features, including: a 2.5MHz operating frequency PWM voltage mode architecture; +/-1% accurate 0.8V reference; up to 3A Output load capability; loss less inductor DCR current sensing; an internal VCC UVLO insures minimum input voltage for proper operation; PWRGD output with adjustable delay eliminates need for additional supervisory circuits; hiccup-mode with 30ms restart delay upon detection of power, thermal, or over-current fault conditions; programmable Soft-Start feature; and programmable VIN UVLO.
"The SP6138 demonstrates Sipex' ability to provide leading edge technology in the Power Management market. This single rail dc-dc controller expands Sipex' recently released SP6133 and SP6136," said Jules Farago, Sr. Technical Marketing Manager. "Sipex is committed to providing designers with unique dc-dc converter solutions like the SP6138 that add value to systems requiring high switching frequencies and single stage power conversions, otherwise not achievable with other industry offerings."
The SP6138 is available in small 3x3 QFN16 packaging, in an extended ambient temperature range from -40 to +85°C. Pricing is $1.95 in 1K units.
