MAX1999EEI

Overview

The MAX1999EEI is a high-efficiency, quad-output main power supply controller designed for notebook applications. It integrates two synchronous step-down (buck) converters and two low-dropout (LDO) linear regulators within a single package. The device supports switching frequencies of 200kHz/300kHz or 400kHz/500kHz to optimize inductor size and efficiency. It operates over an extended temperature range of -40°C to +85°C and is housed in a 28-pin QSOP package.

Feature Summary

• Integrates four output channels combining two synchronous buck converters and two LDO regulators for comprehensive power management.
• Features selectable switching frequencies to balance component size and conversion efficiency.
• Includes built-in protection mechanisms such as overcurrent and overvoltage protection for system reliability.

Applications

• Main power supply controllers for notebook computers
• Multi-rail power distribution systems in portable electronics
• Embedded systems requiring combined switching and linear regulation

Procurement Notes

Verify the specific suffix and revision level against the manufacturer's current datasheet, as legacy Maxim Integrated products may have limited availability or be subject to obsolescence notices. Confirm that the 28-pin QSOP package matches your PCB footprint requirements and that the thermal performance meets your design constraints under maximum load conditions.

Selection Notes

Select this component when a compact solution is needed to generate multiple voltage rails from a single input source. It is suitable for designs where space constraints prevent using discrete controllers for each rail. Ensure the input voltage range and required output currents for the buck and LDO sections align with the system's power budget and efficiency targets.

Part Context

This part belongs to the MAX1977/MAX1999 family of high-efficiency quad-output power controllers. These devices were developed to simplify power architecture in mobile computing platforms by reducing the bill of materials and board area compared to using separate regulator ICs for each voltage rail.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Users should consult Analog Devices official resources for current lifecycle status and potential pin-compatible alternatives if this component is discontinued.