MAX871EUK+

Overview

The MAX871EUK+T is a monolithic CMOS charge-pump voltage inverter manufactured by Analog Devices Inc. under the Maxim Integrated brand. It accepts input voltages ranging from +1.4V to +5.5V and generates an inverted output supply. The device operates at a switching frequency of 500kHz, distinguishing it from the similar MAX870 which runs at 125kHz. Key electrical specifications include a quiescent current of 0.7mA, an output current capability of 25mA, and a voltage conversion efficiency of 99%. 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 negative rail
• High energy conversion efficiency up to 99 percent
• Ultra-small footprint utilizing five-pin surface-mount packaging
• Operates with minimal external component count requiring only two capacitors

Applications

• Generating local negative supply rails from positive logic supplies
• Powering small LCD panel displays
• Providing bias voltages for battery-operated handheld devices
• Supplying negative voltage for medical instruments
• Powering cell phones and personal digital assistants

Procurement Notes

Verify the specific suffix designation against official manufacturer documentation to confirm operational parameters. Ensure the ordering part number matches the required switching frequency characteristics. Confirm that the package type aligns with the intended PCB layout requirements. Check for compliance with relevant environmental standards as specified in the product datasheet. Validate availability status through authorized distribution channels prior to procurement planning.

Selection Notes

Select this component when a compact solution is needed to invert voltage within a low-voltage range. Consider the 500kHz switching frequency for applications requiring faster transient response compared to lower-frequency alternatives. Evaluate the 25mA output current limit against the load requirements of the target circuit. Assess the trade-off between the small package size and thermal dissipation capabilities. Compare performance metrics against other charge-pump inverters if higher output current or different efficiency levels are required.

Part Context

This device belongs to the family of ultra-small monolithic CMOS charge-pump inverters produced by Maxim Integrated. It shares functional similarities with the MAX870 but differs in operating frequency. The series is designed for board-level voltage conversion in space-constrained portable electronics. It complements other power management solutions by providing simple negative rail generation without the need for inductors.

Replacement Considerations

The MAX870 serves as a direct functional substitute within the same package, though it operates at a lower 125kHz frequency. Verify that the application can tolerate the difference in switching speed. No other direct pin-compatible replacements are confirmed in the provided public data.