MAX840ESA+

Overview

The MAX840ESA+ is a low-noise, regulated charge pump voltage regulator manufactured by Analog Devices Inc./Maxim Integrated. Designed for cellular telephone transmitter applications, it provides a single regulated output derived from an internal charge pump topology. The device is housed in an 8-SOIC surface-mount package and operates as a negative voltage generator suitable for biasing GaAsFETs.

Feature Summary

• Integrated charge pump architecture for efficient voltage inversion
• Low-noise regulation capability for sensitive RF circuits
• Single output configuration optimized for transmitter biasing

Applications

• Cellular telephone transmitter voltage regulation
• GaAsFET bias supply generation
• Negative voltage rail creation for RF front-end modules

Procurement Notes

Verify component authenticity through authorized distribution channels due to the prevalence of counterfeits in the market. Confirm RoHS compliance status via the official datasheet before integration. Ensure storage conditions adhere to moisture sensitivity level requirements specified in the manufacturer's handling guidelines to maintain reliability.

Selection Notes

Select this component when a compact, low-noise negative voltage source is required for RF power amplifier biasing. The 8-SOIC package offers a balance between thermal performance and board space efficiency. Consider input voltage ranges and load current requirements against the specific charge pump capabilities defined in the electrical characteristics table.

Part Context

This part belongs to the Maxim Integrated portfolio of power management solutions, specifically targeting mobile communication infrastructure. It complements linear regulators and DC-DC converters by providing specialized inverted voltage rails where noise performance is critical for signal integrity in high-frequency transmission stages.

Replacement Considerations

Consult the official datasheet for direct pin-compatible alternatives within the same product family. Verify that any substitute maintains identical output polarity, noise specifications, and package dimensions to ensure seamless retrofitting without circuit redesign.