MAX871EUK+TG002

Overview

The MAX871EUK+TG002 is a monolithic CMOS charge-pump inverter manufactured by Analog Devices Inc./Maxim Integrated. It accepts input voltages ranging from +1.4V to +5.5V and operates at a switching frequency of 500kHz. The device provides a negative output voltage with up to 25mA output current capability. Key electrical characteristics include 99% voltage conversion efficiency and a quiescent current of 0.7mA. It requires only two external capacitors for operation and is housed in a 5-pin SOT-23 package.

Feature Summary

• Inverts positive input supply voltage to generate a negative rail
• High energy conversion efficiency suitable for battery-powered systems
• Minimal external component requirement utilizing only two capacitors
• Compact surface-mount packaging for space-constrained designs

Applications

• Generating local -5V supply from 5V logic sources
• Powering small LCD panels requiring negative bias
• Voltage inversion for cell phones and handheld terminals
• Powering medical instruments and PDAs
• Battery-operated equipment requiring dual polarity supplies

Procurement Notes

Verify the specific suffix TG002 against official manufacturer documentation, as standard listings typically utilize suffixes like T or G05. Confirm RoHS compliance status and lead times directly with authorized distributors, as availability may be restricted. Ensure the ordering part number matches the exact pinout and thermal requirements for your PCB layout.

Selection Notes

Select this component when a compact solution is needed to invert low-voltage inputs between 1.4V and 5.5V. The 500kHz operating frequency allows for smaller external capacitors compared to lower-frequency alternatives. Consider the 25mA output limit for load requirements and ensure the application does not exceed the maximum power dissipation capabilities of the SOT-23-5 package.

Part Context

This part belongs to the MAX870/MAX871 family of ultra-small switched-capacitor voltage inverters. While the MAX870 operates at 125kHz, the MAX871 variant specifically utilizes a 500kHz frequency. Both share similar architectural features but differ in switching speed and associated external component sizing requirements.

Replacement Considerations

The MAX870 serves as a functional alternative within the same family, differing primarily in its 125kHz operating frequency rather than pin compatibility.