RT5047
Single Output LNB Supply and Control Voltage Regulator
Features
General Description
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, 14.3V and 19.3V by COMP Pin)
3% High Accuracy for 0mA to 500mA Current
Output
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.
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
The RT5047 has fault protection (over-current,
over-temperature and under-voltage lockout).
Output Short Circuit Protection
Over-Temperature Protection
The RT5047 are available in a SOP-8 (Exposed Pad)
package to achieve optimized solution for thermal
dissipation.
Applications
LNB Power Supply and Control for Satellite Set-Top
Box
Ordering Information
Analog and Digital Satellite Receivers/Satellite TV,
Satellite PC cards
RT5047
Package Type
SP : SOP-8 (Exposed Pad-Option 2)
Pin Configuration
(TOP VIEW)
Lead Plating System
G : Green (Halogen Free and Pb Free)
8
LNB
BOOST
LX
TONE
COMP
SEL
2
3
4
7
6
5
Note :
GND
9
Richtek products are :
VIN
EN
RoHS compliant and compatible with the current
SOP-8 (Exposed Pad)
requirements of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering
processes.
Simplified Application Circuit
D1
L1
VIN
C
IN1
C
BST
LX
BOOST
VIN
D3
D5
C
IN2
Max. 550mA
D2
LNB
V
LNB
RT5047
EN
C
D4
LNB
TONE
SEL
COMP
GND
Copyright © 2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS5047-02 July 2017
www.richtek.com
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