MAX859CUA

Overview

The MAX859CUA is a high-efficiency CMOS step-up DC-DC converter manufactured by Analog Devices Inc. (Maxim Integrated). It operates with an input voltage range of 0.8V to 6.0V and provides adjustable output voltages between 2.7V and 6.0V. The device features a switching frequency of 500kHz, a quiescent current of 25µA, and a shutdown mode consuming only 1µA. It supports output currents up to 60mA and includes low-battery detection capabilities. Packaged in an 8-pin µMAX or SO format, it is designed for battery-powered systems.

Feature Summary

• High-efficiency CMOS step-up topology suitable for small form factor designs
• Ultra-low power consumption with 25µA quiescent current and 1µA shutdown mode
• Integrated low-battery detector for monitoring supply levels
• Capable of accepting very low start-up voltages down to 0.8V

Applications

• Battery-powered portable electronic devices
• Systems requiring efficient voltage boosting from single-cell sources
• Low-voltage consumer electronics with strict power constraints

Procurement Notes

Verify component authenticity through authorized channels as the part status is listed as obsolete. Confirm package type and suffix variations against official datasheets before procurement. Check for RoHS compliance details and ensure storage conditions meet manufacturer specifications to prevent degradation of the semiconductor components during handling.

Selection Notes

Select this component when designing circuits that require boosting low input voltages efficiently. Consider the 500kHz switching frequency for inductor size trade-offs. Evaluate the 60mA output capability against load requirements. Ensure the application benefits from the low quiescent current to maximize battery life in portable applications.

Part Context

This device belongs to the MAX856–MAX859 family of high-efficiency CMOS step-up DC-DC switching regulators. These parts are engineered for small, low-input-voltage or battery-powered systems. The series emphasizes efficiency and low power consumption, making them suitable for applications where space and energy preservation are critical design constraints.

Replacement Considerations

Consult official documentation for direct substitutes within the MAX856–MAX859 family. Verify pin compatibility and electrical parameters before replacing. No specific public substitute part numbers are confirmed in the provided data.