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A8290 - Single LNB Supply and Control Voltage Regulator

General Description

Intended for analog and digital satellite receivers, this single 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 an LNB down converter via coaxial cable.

Key Features

  • 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.

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A8290 Single 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