home / products / part numbers / a8298 a8298 single lnb supply and co ntrol voltage regulator contact allegro marketing for datasheet. features integrated boost mosfet, current sensing, and compensation ? stable with low-profile ceramic boost capacitors ? higher voltage ratings support increased surge ? supplies up to 550 ma continuously ? supplies up to 700 ma for reconfiguration ? adjustable lnb output current limit from 300 to 800 ma ? boost peak current limit scales with lnb current limit setting ? 8 programmable lnb output voltage (dac) levels ? lnb overcurrent limiter with shutdown timer ? tracking boost converter minimizes power dissipation ? lnb transition times configurable by external capacitor ? push-pull lnb output stage maintains 13 18 v and 18 13 v transition times, even with highly capacitive loads ? built-in 22 khz tone oscillator facilitates diseqc? tone encoding, even at no-load ? tone generation does not require additional external components ? diagnostic features: png, tdet ? dynamic tone detect amplitude and frequency thresholds ? extensive protection features: uvlo, ocp, tsd, cpok ? 2-wire i2c-compatible interface ? description intended for analog and digital satellite receivers, this single low noise block converter regulator (lnbr) is a monolithic lin ear and switching voltage regulator, specifically designed to provide the power and the interface signals to an lnb down converter via coaxial cable. the a8298 requires few exte rnal components, with the boost switch and compensation circuitry integrated inside of the device. a high switching frequency is chosen to minimize the size of the passiv e filtering components, further assisting in cost reduction. the high levels of component integration ensure extremely low noise and ripple figures. the a8298 has been designed for high efficiency, utilizing the allegro? advanced bcd process. the integrated boost switch has b een optimized to minimize both switching and static losses. to further enhance efficiency, the voltage drop across the tracking regulator has been minimized. for diseqc? communications, a tone control pin is provided to gate the internally-generated 22 khz tone on-and-off. a comprehensive set of fault registers are provided, which comply with all the common standards, including: overcurrent, therma l shutdown, undervoltage, and power not good. the device uses a 2-wire bidirectional serial interface, compatible with the i2c? standard, that operates up to 400 khz. the a8298 is supplied in a lead (pb) free package. functional block diagram part number package type rohs compliant part composition/ rohs data temperature comments samples/demo distributor stock A8298SESTR-T 20-lead qfn yes view data -20 c to 85 c new contact local sales representative or check distributor stock all check stock apek8298ses-01-t demo board no -- -20 c to 85 c new contac t local sales re p resentative complete part numbers allegro's products are no t to be used in life support devices or systems, if a failure of an allegro p roduct can reasonably be expected to cause the failure of that life su pp or t device or s y stem, or to a ff ect the sa f et y or e ff ectiveness o f that device or s y stem. pa g e 1 of 2 alle g ro | product | a8298 sin g le lnb suppl y and control volta g e re g ulato r 10/4/2011 htt p ://www.alle g romicro.com/en/products/part _ numbers/8298 /
copyright ? 2011 allegro microsystems, inc. ? 115 northeast cutoff, worcester, ma 01606 usa ? phone: 1.508.853.5000 ? fax: 1.508.853.7895 pa g e 2 of 2 alle g ro | product | a8298 sin g le lnb suppl y and control volta g e re g ulato r 10/4/2011 htt p ://www.alle g romicro.com/en/products/part _ numbers/8298 /
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