The Richtek RT5047BFGSP is a power management integrated circuit designed to supply power and control signals to LNBs used in satellite receiving systems.

This device integrates a current-mode boost controller, an LDO regulator and the circuitry required for 22kHz tone shaping, enabling DiSEqC 1.x communication support in compatible applications.

The LNB output can be selected between 13.3V and 18.3V via the SEL pin, making it suitable for systems where LNB supply voltage must be controlled according to polarization or satellite system operating mode.

With an 8V to 16V input range, 550mA output current limit with 6ms timer and listed ±3% accuracy from 0mA to 500mA output current, the RT5047BFGSP is suitable for satellite receivers, PC SAT cards, set-top boxes and LNB power supply modules.

The device includes important protection features such as output short-circuit protection, over-temperature protection, current limiting and undervoltage lockout / UVLO, helping protect the circuit under fault conditions.

The 8-SOP-EP / PSOP-8 exposed pad package allows surface-mount assembly and improved thermal dissipation when used with a suitable PCB layout.

Main features

LNB supply and control regulator
Manufacturer / brand: Richtek
Manufacturer reference: RT5047BFGSP
Base product number: RT5047
Family: RT5047BF
Product type: special purpose regulator / LNB PMIC
Main application: LNB supply and control
Number of outputs: 1
Number of channels: 1
Number of boost converters: 1
Number of LDO regulators: 1
Input voltage: 8V to 16V
Output voltage: 13.3V / 18.3V
Output voltage selection: via SEL pin
SEL low: 13.3V
SEL high: 18.3V
Listed output current: up to 500mA in specified operation
Current limit: 550mA with 6ms timer
Output accuracy: ±3% from 0mA to 500mA
Control: current mode
Internal compensation: yes
External tone input: 22kHz
Communication compatibility: DiSEqC 1.x
Output stage: push-pull to reduce transition time
Protection features: output short-circuit, overcurrent, over-temperature and UVLO
Mounting type: surface mount / SMD
Package: 8-SOP-EP / PSOP-8 with exposed pad
Package / Case: 8-SOIC with exposed pad
Operating temperature: -40°C to 85°C TA
Suitable for satellite receivers, set-top boxes and LNB power supply

Recommended applications

LNB supply and control in satellite systems
Satellite set-top boxes
Digital satellite receivers
Analog satellite receivers
PC SAT cards
LNB power supply modules
Systems with 13.3V / 18.3V selection
Applications compatible with 22kHz tone
Systems compatible with DiSEqC 1.x
Repair of compatible LNB power supplies
Replacement on boards where RT5047BFGSP is specified

Important note

Before use, always confirm the exact component reference, pinout, package, input voltage, required output voltage, LNB current, inductor, diode, capacitors, PCB layout, thermal dissipation and compatibility with the original circuit.

This component is a specific LNB power supply and control regulator, and should not be treated as a generic DC/DC regulator. To operate correctly, it must be used with the external components and circuit recommended in the datasheet.

The 13.3V / 18.3V output depends on SEL pin control and circuit configuration. Use of the 22kHz tone and DiSEqC 1.x protocol must be compatible with the equipment where the device will be integrated.

This product is sensitive to electrostatic discharge. Use proper ESD handling precautions. This item corresponds only to the Richtek RT5047BFGSP integrated circuit. PCB, LNB, inductor, diode, capacitors, resistors, cables, connectors and other components are not included unless expressly stated otherwise.