MAX859ESA-T

Overview

The MAX859ESA-T 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 2.7 V to 6 V and provides a fixed output voltage of either 3.3 V or 5 V, or an adjustable output. The device delivers an output current of 60 mA and functions at a switching frequency of 500 kHz. It is housed in an 8-pin SOIC package (ESIA) and supports surface-mount installation. The component is rated for operation within a temperature range of 0°C to +70°C.

Feature Summary

• Boost topology for efficient voltage step-up conversion
• Integrated switch for compact design
• Fixed or adjustable output voltage options

Applications

• Portable battery-powered devices requiring voltage boosting
• General-purpose power supply circuits
• Embedded systems with single-cell lithium-ion or alkaline battery inputs

Procurement Notes

Verify the specific suffix 'T' indicates tape-and-reel packaging if required for automated assembly. Confirm RoHS compliance status as indicated in official documentation. Check for obsolescence notices from Analog Devices, as this part may be discontinued or subject to limited availability. Ensure the selected output voltage variant matches the application requirements before procurement.

Selection Notes

Select this component when a low-cost, small-footstep boost converter is needed for currents up to 60 mA. Consider the 500 kHz switching frequency for inductor size trade-offs. Verify that the input voltage range covers the minimum battery discharge curve. Compare against newer Maxim Integrated alternatives if higher efficiency or wider operating temperatures are required.

Part Context

The MAX859 belongs to a family of high-efficiency step-up converters designed for portable applications. It integrates a power switch and control circuitry to minimize external component count. The ESA package offers a compact solution for space-constrained designs. This series is commonly used in mobile phones, PDAs, and other handheld electronics.

Replacement Considerations

Check for direct pin-compatible replacements within the MAX859 family, such as variants with different fixed output voltages. Consult Analog Devices for recommended upgrades if the MAX859ESA-T is obsolete. Ensure any substitute maintains the 60 mA output current capability and similar switching frequency.