A8286
Dual LNB Supply and Control Voltage Regulator
Features and Benefits
▪ 2-wire serial I2C™ -compatible interface: ...
A8286
Dual LNB Supply and Control
Voltage Regulator
Features and Benefits
▪ 2-wire serial I2C™ -compatible interface: control (write) and status (read)
▪ LNB
voltages (16 programmable levels) compatible with all common standards
▪ Tracking switch-mode power converter for lowest dissipation ▪ Integrated converter switches and current sensing ▪ Output current limit of 900 mA typical, with 48 ms timer ▪ Static current limit circuit allows full current at startup and
13→18 V output transition; reliably starts wide load range ▪ Push-pull output stage minimizes 13→18 V and 18→13 V
output transition times for highly capacitive loads ▪ Adjustable rise/fall time via external timing capacitor ▪ Built-in tone oscillator, factory-trimmed to 22 kHz
facilitates DiSEqC™ tone encoding, even at no-load ▪ Four methods of 22 kHz tone generation, via I2C™ data
bits and/or external pin ▪ 22 kHz tone detector facilitates DiSEqC™ 2.0 decoding ▪ Diagnostics for output
voltage level, input supply UVLO,
and DiSEqC™ tone output ▪ Cable disconnect diagnostic ▪ Auxiliary modulation input ▪ LNB overcurrent with timer
Package: 28-pin QFN (suffix ET)
Description
Intended for analog and digital satellite receivers, this dual low-noise block converter regulator (LNBR) is a monolithic linear and switching
voltage regulator, specifically designed to provide the power and the interface signals to two LNB down converters via coaxial cables. The A8286 requires few external components, with the boost switches an...