RT5047

Copyright © 2015 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

DS5047-00

March

2015

www.richtek.com

1

Single Output LNB Supply and Control Voltage Regulator

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

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.

Ordering Information

RT5047

Package Type

SP : SOP-8 (Exposed Pad-Option 2)

Lead Plating System

G : Green (Halogen Free and Pb Free)

Note :

Richtek products are :



RoHS compliant and compatible with the current

requirements of IPC/JEDEC J-STD-020.



Suitable for

use in

SnPb

or

Pb-free soldering

processes.

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 DiSEqC



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

Pin Configurations

(TOP VIEW)

LNB

BOOST

LX

VIN

TONE

NC

EN

SEL

GND

2

3

4

5

6

7

8

9

SOP-8 (Exposed Pad)

Simplified Application Circuit

VIN

VIN

RT5047

L1

LX

SEL

TONE

GND

LNB

Max. 550mA

BOOST

EN

D1

D2

D4

D3