MAX859ESA

Overview

The MAX859ESA is a step-up DC-DC converter manufactured by Analog Devices Inc. under the Maxim Integrated brand. It operates with an input voltage range of 0.8 V to 6 V and provides an adjustable output voltage between 2.7 V and 6 V. The device delivers a switch current of 125 mA at a fixed switching frequency of 500 kHz. It utilizes a boost topology without synchronous rectification and is housed in an 8-SOIC surface-mount package. The component supports operation within a temperature range of -40°C to +85°C.

Feature Summary

• Boost topology for efficient voltage step-up conversion
• Adjustable output voltage capability via external feedback
• Fixed 500 kHz switching frequency for compact passive design
• Wide input voltage range supporting single-cell battery applications

Applications

• Portable handheld devices requiring voltage regulation from single-cell sources
• Battery-powered systems needing stable output from varying input levels
• General-purpose power management in consumer electronics

Procurement Notes

Verify the specific suffix (e.g., +T for tape and reel) against your assembly requirements, as packaging affects handling. Confirm RoHS compliance status directly with the manufacturer or authorized distributors, as historical data may vary. Ensure the 8-SOIC footprint matches your PCB layout constraints. Check for obsolescence notices or lifecycle changes before finalizing procurement plans.

Selection Notes

Select this component when a non-synchronous boost converter is sufficient for efficiency requirements below critical thresholds. The 125 mA output current limits suitability for high-power loads. Consider thermal performance in enclosed designs due to the lack of active cooling features. Verify that the 500 kHz frequency aligns with EMI constraints in the target application environment.

Part Context

The MAX859ESA belongs to the MAX858/MAX859 family of step-up converters designed for low-cost, space-constrained applications. It shares architectural similarities with the MAX858 but offers distinct current and voltage specifications. This series targets portable electronics where simplicity and minimal external component count are prioritized over maximum efficiency.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Cross-reference with MAX858ESA for similar functionality, noting differences in output current and voltage ranges. Consult official Analog Devices resources for updated replacement recommendations.