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 is housed in a compact UMAX-10 surface-mount package, suitable for operation from -40°C to +85°C.

Feature Summary

• Generates stable negative bias voltage specifically optimized for GaAsFET power amplifier applications
• Includes integrated Power OK signal to indicate valid output voltage status
• Maintains ultra-low quiescent current consumption for efficient battery-powered systems

Applications

• Biasing GaAsFET power amplifiers in RF communication circuits
• Negative rail generation for portable wireless devices
• Low-noise power supply stages in cellular infrastructure modules

Procurement Notes

Verify the specific suffix against official Analog Devices documentation to confirm pinout and electrical characteristics. Confirm RoHS compliance status through the manufacturer's datasheet. Check current availability as distribution channels may list limited stock or obsolete status. Ensure the UMAX-10 package footprint matches your PCB design requirements before ordering.

Selection Notes

Select this component when a precise negative bias voltage is required for GaAsFET PA linearization. The low noise characteristic is critical for maintaining signal integrity in RF front-end modules. Consider the 4 mA output capability against the amplifier's bias current needs. The small UMAX-10 package aids in space-constrained designs where board real estate is limited.

Part Context

This part belongs to the Maxim Integrated PMIC portfolio, focusing on specialized power solutions for RF and wireless applications. The MAX881 series addresses the specific need for clean negative rails in high-frequency transistor biasing. It complements positive LDO regulators by providing complementary voltage levels for dual-supply operational environments.

Replacement Considerations

Consult Analog Devices technical support for verified cross-reference part numbers. Verify that any substitute maintains the same negative output polarity and UMAX-10 package dimensions. Ensure replacement components meet the same low-noise specifications required for GaAsFET biasing.