General Description
The RT5047A is a highly integrated voltage regulator and interface IC, specifically design for supplying power and control signals from advanced satellite set-top box (STB) modules to the LNB down-converter in the antenna dish or to the multi-switch box.
The device is consists of the independent current-mode boost controller and low dropout linear regulator along with the circuitry required for 22KHz tone shaping to support DiSEqC™1.x communications.
The RT5047A has fault protection (over-current, over-temperature and under-voltage lockout).
The RT5047A are available in a SOP-8 (Exposed Pad) package to achieve optimized solution for thermal dissipation.

Features
• Wide Input Supply Voltage Range : 8V to 16V
• Output Current Limit of 550mA with 45ms timer
• Low Noise LNB Output Voltage (13.3V and 18.3V
   by SEL Pin)
• ±3% High Accuracy for 0mA to 500mA Current
   Output
• Push-Pull Output Stage minimizes 13.3V to
   18.3V and 18.3V to 13.3V Output Transition Time
• External 22kHz Tone Input
• Meet DiSEqCTM1.x Protocol
• Output Short Circuit Protection
• Over-temperature Protection

Applications
• LNB Power Supply and Control for Satellite Set-Top
   Box
• Analog and Digital Satellite Receivers/ Satellite TV,
   Satellite PC cards