MAX1821EBC

Overview

The MAX1821EBC is a synchronous step-down DC-DC buck regulator optimized for powering microprocessor cores and power amplifiers. It features an input voltage range of 2.6V to 5.5V and a programmable output voltage range of 1.25V to 5.5V with a single output configuration. The device achieves up to 95% efficiency and includes a power-on reset function. It operates within a temperature range of -40°C to +85°C and is housed in a 3 x 4 UCSP package.

Feature Summary

• Synchronous step-down architecture optimized for high efficiency
• Programmable output voltage providing flexibility over fixed-output designs
• Integrated power-on reset function for system reliability

Applications

• DDR voltage regulation
• Microprocessor core power supply
• Power amplifier biasing

Procurement Notes

Verify the specific suffix (e.g., EBC vs. EBC-T) against the manufacturer's official datasheet to confirm package type and tape-and-reel specifications. Ensure the operating temperature grade matches the application requirements, as variants exist for different thermal ranges. Cross-reference the part number with Analog Devices documentation to confirm pinout compatibility and electrical characteristics before procurement.

Selection Notes

Select this component when a flexible, programmable output voltage is required for DDR or processor applications. It is suitable for designs needing high efficiency within a 2.6V to 5.5V input range. Consider the UCSP package size for space-constrained layouts. Verify that the load current requirements align with the regulator's capabilities and that the thermal performance meets the system's dissipation needs.

Part Context

This device belongs to the MAX1820/MAX1821 family of synchronous buck regulators. These components are designed to provide efficient power conversion for digital logic and memory interfaces. The MAX1821 variant specifically offers programmable output control, distinguishing it from fixed-output counterparts in the series.

Replacement Considerations

Check for direct cross-references in Analog Devices' replacement guides. Generic synchronous buck regulators may serve as alternatives if pinouts and electrical parameters match exactly. Verify that any substitute supports the same input/output voltage ranges and package dimensions.