MAX881REUB-T

Overview

The MAX881REUB-T is a specialized power management IC designed as a low-noise bias supply for GaAsFET power amplifiers. It operates within an input voltage range of 2.5 V to 5.5 V and delivers a fixed negative output voltage between -2.1 V and -1.9 V. The device provides an output current of 4 mA while consuming only 500 uA of quiescent current. It features a Power OK status indicator and functions reliably across a temperature range of -40°C to +85°C in a compact UMAX-10 surface-mount package.

Feature Summary

• Generates stable negative bias voltage specifically optimized for GaAsFET power amplifier applications
• Includes integrated Power OK signal to monitor output validity and ensure system reliability
• Maintains ultra-low quiescent current consumption to preserve battery life in portable devices

Applications

• Biasing GaAsFET power amplifiers in mobile communication handsets
• RF front-end modules requiring precise negative gate voltage control
• Portable wireless equipment with strict power efficiency constraints

Procurement Notes

Verify the specific suffix 'T' indicates tape-and-reel packaging when sourcing. Confirm RoHS compliance status through official manufacturer documentation, as legacy variants may differ. Ensure the selected component matches the required UMAX-10 footprint for PCB layout compatibility. Cross-reference the datasheet revision to confirm electrical characteristics align with current design specifications.

Selection Notes

Select this component when designing circuits that require a dedicated negative rail for GaAsFET PA gates. The fixed output voltage eliminates external resistor networks, simplifying board space. Consider the 4 mA output capability against the target amplifier's bias requirements. The low noise characteristic is critical for maintaining signal integrity in RF transmission paths without adding interference.

Part Context

This part belongs to the Maxim Integrated PMIC portfolio, focusing on specialized power solutions for RF applications. It complements linear regulators by providing tailored negative voltage generation. The UMAX-10 package offers a small form factor suitable for dense mobile layouts. Analog Devices continues to support this series for legacy and niche RF designs requiring proven stability.

Replacement Considerations

Check for direct pin-compatible upgrades within the MAX881R family. Verify if newer generations offer improved noise performance or extended operating temperatures. Ensure any substitute maintains the same negative output polarity and current capacity for GaAsFET compatibility.