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  Richtek Technology Electronic Components Datasheet  

RT5047 Datasheet

Single Output LNB Supply and Control Voltage Regulator

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RT5047 pdf
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 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.
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 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
Pin Configurations
(TOP VIEW)
LNB
BOOST
LX
VIN
8
27
GND
36
9
45
TONE
NC
SEL
EN
SOP-8 (Exposed Pad)
Simplified Application Circuit
L1
VIN
CIN1
CIN2
VIN
LX
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


  Richtek Technology Electronic Components Datasheet  

RT5047 Datasheet

Single Output LNB Supply and Control Voltage Regulator

No Preview Available !

RT5047 pdf
RT5047
Marking Informaton
RT5047
GSPYMDNN
RT5047GSP : Product Number
YMDNN : Date Code
Functional Pin Description
Pin No.
Pin Name
Pin Function
1 LNB
Output Voltage for LNB.
2
BOOST
Boost Output and Tracking Supply Voltage to LNB.
3 LX
Switching Node of DC/DC Boost Converter.
4 VIN
Power Supply Input.
5 EN
LNB Output Enable.
6 SEL
LNB Output Voltage Selection Pin (Low is for 13.3V, high is for 18.3V).
7 NC
No Internal Connection. Pull to GND by 4.7kresistor.
8 TONE
9 (Exposed Pad) GND
22kHz TONE Input.
Ground. The Exposed Pad must be soldered to a large PCB and connected
to GND for maximum power dissipation.
Function Block Diagram
VIN
UVLO
VR1
VFB1
Error
Amp
OCP1
PWM
Controller
LX
BOOST
RF1 RF2
EN OSC
Oscillator
SEL
2-steps
Voltage
Setting
VD2
VFB2
Linear
Regulator
OCP2
Dynamic
Dropout
Control
VUD
LNB
TONE
Bandgap
Reference
22kHz Tone Shape
VFB2
OTP
GND
VD1
VR1 Reference
Voltage
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS5047-00 March 2015


Part Number RT5047
Description Single Output LNB Supply and Control Voltage Regulator
Maker Richtek
Total Page 16 Pages
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