RT5047A Просмотр технического описания (PDF) - Richtek Technology
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RT5047A Datasheet PDF : 16 Pages
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RT5047A
Single Output LNB Supply and Control Voltage Regulator
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 DiSEqCTM1.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.
Ordering Information
RT5047A
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
2
7
GND
3
6
9
4
5
TONE
FAULT
SEL
EN
SOP-8 (Exposed Pad)
Simplified Application Circuit
VIN
CIN1
CIN2
L1
D1
LX
VIN
BOOST
3.3V
R1
EN
TONE
SEL
LNB
RT5047A
FAULT
GND
CBST
D3
Max. 550mA
D2
CLNB
D4
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
DS5047A-00 March 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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