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