RT5047 Datasheet, PDF (1/16 Pages) Richtek Technology Corporation – Single Output LNB Supply and Control Voltage Regulator

RT5047
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
support DiSEqC^TM1.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.
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^TM1.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
Pin Configurations
(TOP VIEW)
LNB
BOOST
LX
VIN
8
2
7
GND
3
6
9
4
5
TONE
NC
SEL
EN
SOP-8 (Exposed Pad)
Simplified Application Circuit
L1
VIN
CIN1
CIN2
LX
VIN
D1
BOOST
EN
TONE
SEL
LNB
RT5047
GND
CBST
Max. 550mA
D2
CLNB
D3
VLNB
D4
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
DS5047-00 March 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1