RT5047GSP

Overview

The RT5047GSP is a single-output LNB supply and control voltage regulator designed for satellite set-top box applications. It integrates a current-mode boost controller, a low dropout 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 an output current limit of 550mA. It features selectable LNB output voltages of 13.3V or 18.3V via the SEL pin, with high accuracy of 3% across a 0mA to 500mA load range. The IC includes comprehensive fault protection mechanisms such as over-current, over-temperature, and under-voltage lockout.

Feature Summary

• Integrates independent current-mode boost controller and low dropout linear regulator for combined power and control signal generation.
• Supports DiSEqC 1.x protocol through dedicated 22kHz tone shaping circuitry and push-pull output stage for fast transition times.
• Provides robust fault protection including over-current, over-temperature, and under-voltage lockout for reliable operation.

Applications

• LNB Power Supply and Control for Satellite Set-Top Box
• Analog and Digital Satellite Receivers
• Satellite TV Systems
• Satellite PC Cards

Procurement Notes

Verify the specific suffix (GSP) against the manufacturer's latest datasheet to confirm package type and tape/reel specifications. Ensure compatibility with the required input voltage range and thermal dissipation requirements for the SOP-8 exposed pad package. Cross-reference the part number with official Richtek documentation to confirm RoHS compliance status and moisture sensitivity levels before procurement.

Selection Notes

Select this component when designing systems requiring integrated LNB power regulation and DiSEqC communication support in a compact form factor. The device is suitable for applications needing precise voltage selection between 13.3V and 18.3V with minimal external components. Consider the thermal performance of the exposed pad package and the internal compensation features that simplify design implementation compared to discrete solutions.

Part Context

The RT5047 series belongs to Richtek's portfolio of specialized power management ICs tailored for satellite reception equipment. This family addresses the specific needs of powering Low Noise Block down-converters while managing control signals. The GSP variant denotes a specific packaging and trailing configuration within the broader RT5047 product line, maintaining the core functional characteristics of the series.

Replacement Considerations

RT5047BGSP is a documented alias for this component. Verify pinout and electrical parameters against the RT5047A series if considering alternative variants from the same manufacturer family.

FAQ

How does the RT5047GSP handle DiSEqC communications?

It includes dedicated circuitry for 22kHz tone shaping to support DiSEqC 1.x protocol communications.

What fault protections are included in the RT5047GSP?

The device features over-current protection, over-temperature protection, and under-voltage lockout.