MAX881REUB

Overview

The MAX881REUB+ 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 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 UMAX-10 surface-mount package.

Feature Summary

• Provides low-noise negative bias voltage specifically optimized for GaAsFET power amplifier applications
• Includes integrated Power OK signal to indicate valid output voltage status
• Operates with ultra-low quiescent current consumption for efficient power management

Applications

• Biasing GaAsFET power amplifiers in RF communication systems
• Negative voltage generation for analog front-end circuits
• Low-noise power supply stages in wireless infrastructure equipment

Procurement Notes

Verify the exact suffix (e.g., REUB+) against the manufacturer datasheet to confirm package type and temperature grade. Confirm RoHS compliance status through official documentation. Check current availability as distribution may be limited or restricted. Ensure the ordering part number matches the specific variant required for your design specifications.

Selection Notes

Select this component when a stable, low-noise negative bias is required for GaAsFET PA gates. The fixed output range suits applications needing approximately -2V. Consider the 4 mA output capability against load requirements. The UMAX-10 package offers a compact solution for space-constrained PCB layouts compared to larger packages.

Part Context

This device belongs to the MAX881R series of specialized PMICs from Analog Devices/Maxim Integrated. It addresses the specific need for clean negative rail generation in RF power stages, distinguishing itself from general-purpose LDOs by its focus on noise performance and PA-specific biasing characteristics.

Replacement Considerations

Consult the official datasheet for direct pin-compatible alternatives within the same family. Verify that any substitute maintains the specific negative output voltage range and low-noise profile required for GaAsFET operation.