MAX1678EUA

Voltage Regulators - DC DC Switching Regulators Overview

The MAX1678EUA is a high-efficiency, low-voltage, synchronous-rectified step-up DC-DC converter designed for portable applications. It operates from a single-cell alkaline or NiMH battery source (0.9V to 5.5V input) and provides a regulated output voltage up to 5.5V. The device integrates a 550mA power switch and supports adjustable output voltages via external resistors. Operating at a fixed switching frequency of 150kHz, it minimizes external component size. The part is housed in an 8-pin UMAX package and functions within a temperature range of -40°C to +85°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Synchronous rectification architecture ensures high conversion efficiency across the load range.
• Integrated 550mA power switch reduces the need for external inductors and diodes.
• Fixed 150kHz switching frequency allows for the use of small passive components.
• Low startup voltage enables operation from fully discharged single-cell batteries.

Voltage Regulators - DC DC Switching Regulators Applications

• Portable devices powered by single-cell alkaline or NiMH batteries
• Cellular phones and personal digital assistants (PDAs)
• Handheld instruments requiring efficient voltage boosting

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix (e.g., EUA vs. EUAT) against the manufacturer's current datasheet to confirm packaging and tape-and-reel options. Confirm RoHS compliance status as manufacturing processes may update over time. Check for active discontinuation notices or lifecycle changes directly with Analog Devices, as availability for this legacy Maxim Integrated product line may be limited.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when designing systems that require efficient voltage boosting from a single-cell battery source. Ensure the required output current does not exceed the integrated 550mA limit. Verify that the external inductor selection aligns with the 150kHz switching frequency to maintain stability and efficiency. Consider the UMAX package constraints for PCB layout if space is a critical factor.

Voltage Regulators - DC DC Switching Regulators Part Context

This component belongs to the MAX1678 family of synchronous boost converters. It shares functional similarities with other Maxim Integrated low-voltage DC-DC regulators but is distinct in its specific integration of the power switch and fixed frequency operation. It serves as a power management solution for ultra-low voltage applications where efficiency and component count are prioritized.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Consult official cross-reference lists for direct pin-compatible alternatives such as the MAX1679 series, noting differences in charging capabilities versus pure regulation. Verify that any substitute maintains the 150kHz frequency and 550mA current rating to ensure circuit compatibility without redesigning the passive components.