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  Richtek Technology Electronic Components Datasheet  

RT5070 Datasheet

Single Output LNB Supply and Control Voltage Regulator

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RT5070
Single Output LNB Supply and Control Voltage Regulator
General Description
The RT5070 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 for the
LNB power.
The RT5070 has fault protection (over-current,
over-temperature and under-voltage lockout).
The RT5070 are available in a SOP-8 (Exposed Pad)
package to achieve optimized solution for thermal
dissipation.
Ordering Information
RT5070
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
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
GND
FAULT
SEL
EN
SOP-8 (Exposed Pad)
Simplified Application Circuit
VIN
CIN1
L1
D1
CBST
CIN2
3.3V
R1
LX
VIN
BOOST
D3
Max. 550mA
D5
EN
RT5070
LNB
VLNB
SEL
D2
CLNB
D4
FAULT
GND
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
DS5070-01T00 November 2016
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT5070 Datasheet

Single Output LNB Supply and Control Voltage Regulator

No Preview Available !

RT5070
Marking Information
RT5070
GSPYMDNN
RT5070GSP : 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 FAULT
8, 9 (Exposed Pad) GND
Fault detection pin. Pull to 3.3V by 4.7kresistor.
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
Error
VFB1 Amp
OCP1
PWM
Controller
LX
BOOST
RF1 RF2
EN OSC
Oscillator
SEL
2-steps
Voltage
Setting
VD2
Linear
Regulator
OCP2
Logic
Dynamic
Dropout
Control
VUD
LNB
Bandgap
Reference
OTP
GND
VD1
VR1
Reference
Voltage
FAULT
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS5070-01T00 November 2016


Part Number RT5070
Description Single Output LNB Supply and Control Voltage Regulator
Maker Richtek
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