General Description

The RT5047 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 DiSEqCTM1.x communications. The RT5047 has fault protection (over-current, over-temperature and under-voltage lockout). The RT5047 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