MAX858CPA

Overview

The MAX858CPA is a high-efficiency, step-up DC-DC converter manufactured by Analog Devices Inc./Maxim Integrated. It operates within a supply voltage range of 0.7V to 3.6V and delivers an adjustable output voltage up to 12V. The device integrates a 400mA power switch and utilizes a current-mode control architecture for rapid transient response. It supports both continuous and discontinuous conduction modes to optimize efficiency across varying load conditions. The component is housed in an 8-pin SOIC package.

Feature Summary

• Integrates a low-on-resistance power switch to minimize conduction losses
• Employs current-mode control for improved line and load regulation
• Supports flexible input voltage ranges suitable for single-cell battery applications
• Includes internal compensation to reduce external component count

Applications

• Portable consumer electronics powered by single-cell batteries
• Battery-powered instrumentation and measurement devices
• Wireless communication modules requiring efficient voltage boosting
• Low-voltage microcontroller systems needing stable higher voltage rails

Procurement Notes

Verify the specific suffix 'CPA' against official manufacturer documentation to confirm pinout compatibility and temperature grade. Confirm RoHS status as historical data may vary. Check for obsolescence notices or product change notifications prior to procurement. Ensure the source document explicitly lists this exact part number to avoid substitution errors with similar variants.

Selection Notes

Select this component when designing circuits that require boosting very low input voltages, such as those from depleted lithium-ion cells, to a stable higher output. Consider the maximum switch current limit and inductor saturation characteristics during selection. Evaluate thermal performance requirements based on the expected load current and ambient operating conditions. Verify that the required output voltage falls within the adjustable range supported by the feedback network configuration.

Part Context

The MAX858 belongs to a family of high-efficiency step-up converters designed for portable applications. It shares functional similarities with other Maxim integrated switch regulators but is distinguished by its specific input voltage range and current capabilities. This part represents a solution for space-constrained designs where high efficiency at light loads is critical for extending battery life.

Replacement Considerations

Consult official cross-reference guides for verified substitutes. Ensure any replacement matches the pinout, switching frequency, and control architecture. Verify that alternative components support the same minimum input voltage and output current requirements.