RT5047AGSP

Overview

The RT5047AGSP is a single-output LNB supply and control voltage regulator designed for satellite set-top box applications. It integrates a current-mode boost controller, an LDO linear regulator, and 22kHz tone shaping circuitry to support DiSEqC 1.x communications. The device operates with an input voltage range of 8V to 16V and provides adjustable output voltages of 13.3V or 18.3V via the SEL pin. It delivers an output current up to 500mA with ±3% accuracy across the load range. Key electrical parameters include a switching frequency of 700kHz, a static current of 16mA, and an operating temperature range from -40°C to +85°C.

Feature Summary

• Integrates independent current-mode boost controller and low dropout linear regulator for combined power and control functions
• Supports DiSEqC 1.x protocol through dedicated 22kHz tone shaping circuitry and external tone input capability
• Features push-pull output stage architecture to minimize transition time between 13.3V and 18.3V output states
• Includes comprehensive fault protection mechanisms such as over-current, over-temperature, and under-voltage lockout

Applications

• LNB power supply and control for satellite set-top boxes
• Analog and digital satellite receivers
• Satellite TV systems
• Satellite PC cards

Procurement Notes

Verify the specific suffix (GSP) indicates the SOP-8 Exposed Pad package configuration when sourcing. Confirm RoHS compliance status and moisture sensitivity level requirements against your assembly process specifications. Ensure the selected variant matches the required output voltage selection method via the SEL pin. Cross-reference the manufacturer part number with authorized distributors to ensure authenticity and traceability of the Richtek Technology Corporation component.

Selection Notes

Select this component when designing satellite receiver power stages requiring integrated LNB control and regulation. The wide input voltage range accommodates typical automotive or residential power supplies. The exposed pad package facilitates thermal management for continuous operation. Consider the 700kHz switching frequency for inductor size optimization. Verify that the 500mA output current meets the peak demands of the connected LNB down-converter unit.

Part Context

The RT5047 series serves as a specialized interface IC within Richtek's PMIC portfolio, targeting the satellite communication market. It consolidates multiple discrete functions into a single solution, reducing board space and component count. The device complements other Richtek regulators by addressing the specific voltage and protocol requirements of LNB interfaces. It represents a highly integrated approach to managing power delivery and control signals in advanced STB modules.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.