A8299 Dual LNB Supply and Control Voltage Regulator Pre-End-of-Life This device is in production, however, it has been deemed Pre-End of Life. The product is approaching end of life. Within a minimum of 6 months, the device will enter its final, Last Time Buy, order phase. Date of status change: December 5, 2018 Recommended Substitutions: Generation 4 and 5 devices For existing customer transition, and for new customers or new appli- cations, contact Allegro Sales. NOTE: For detailed information on purchasing options, contact your local Allegro field applications engineer or sales representative. Allegro MicroSystems, LLC reserves the right to make, from time to time, revisions to the anticipated product life cycle plan for a product to accommodate changes in production capabilities, alternative product availabilities, or market demand. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, LLC assumes no respon- sibility for its use nor for any infringements of patents or other rights of third parties which may result from its use.A8299 Dual LNB Supply and Control Voltage Regulator FEATURES AND BENEFITS DESCRIPTION Integrated boost MOSFET, current sensing, and compensation Intended for analog and digital satellite receivers, this dual Stable with low-profile ceramic boost capacitors low noise block converter regulator (LNBR) is a monolithic Adjustable LNB output current limit from 250 to 950 mA linear and switching voltage regulator, specifically designed to Covers wide array of application requirements provide the power and the interface signals to an LNB down Minimizes component sizing to fit each application converter via coaxial cable. The A8299 requires few external For startup, reconfiguration, and continuous output components, with the boost switch and compensation circuitry (maximum value depends on PCB thermal design) integrated inside of the device. A high switching frequency is Boost peak current limit scales with LNBx current chosen to minimize the size of the passive filtering components, limit setting further assisting in cost reduction. The high levels of component 8 programmable LNBx output voltage (DAC) levels integration ensure extremely low noise and ripple figures. LNBx overcurrent limiter with shutdown timer The A8299 has been designed for high efficiency, utilizing Static LNBx current limit reliably starts a wide range the Allegro advanced BCD process. The integrated boost of loads switch has been optimized to minimize both switching and Tracking boost converter minimizes power dissipation static losses. To further enhance efficiency, the voltage drop LNBx transition times configurable by external capacitor across the tracking regulator has been minimized. Push-pull LNBx output stage maintains 1318 V and 1813 V transition times, even with highly capacitive loads For DiSEqC communications, a tone control pin is provided Built-in 22 kHz tone oscillator facilitates DiSEqC tone to gate the internally-generated 22 kHz tone on-and-off. encoding, even at no-load A comprehensive set of fault registers are provided, which Continued on the next page comply with all the common standards, including: overcurrent, thermal shutdown, undervoltage, and power not good. PACKAGE: 28-contact QFN (suffix ET) Furthermore, design methodology and structure ensure the highest level of robustness against transients and component failures. The device uses a 2-wire bidirectional serial interface, 2 compatible with the I C standard, that operates up to 400 kHz. 5 mm 5 mm 0.90 mm The A8299 is supplied in a lead (Pb) free package. Functional Block Diagram GNDLXx LXx BOOSTx VCPx VIN V CLK FB Charge IC 352 kHz Boost VREG Pump Power Osc BOOST Regulator REF 0.8 V + GND V IN LNBx Slew LNB Ref REF Linear DAC Rate + Regulator Limiter ILIM OC TCAPx 22 kHz Tone RESET On / Off Generator ISET TCTRLx 3 VSEL2 / 1 / 0 Unlatched SDA Status PNG, CPOK SCL ADD 2 I C SET Latched TSD Interface Faults RESET V RST IN UVLO, OCP, Timer Read TSD IRQ 45 ms Fault ADJ Tone TDIx TDET Detector One of two channels shown (x =1, 2) A8299-DS, Rev. 2 February 8, 2019 MCO-0000472