ADP1108AR-3.3

Overview

The ADP1108AR-3.3 is a micropower switch-mode DC-to-DC converter manufactured by Analog Devices Inc., housed in an 8-pin SOIC package. It delivers a fixed 3.3 V output with an internal 1 A power switch, operating from input voltages between 2.0 V and 30 V. The device consumes only 110 µA of supply current and supports both step-up and step-down topologies. Key features include a low battery detector comparator and on-chip user-adjustable current limit, requiring minimal external components for implementation.

Feature Summary

• Supports versatile step-up or step-down mode operation within a wide input voltage range
• Integrates an internal 1 A power switch to minimize external component count
• Includes a low battery detector comparator for system monitoring
• Features user-adjustable current limiting for enhanced protection

Applications

• Notebook and palm-top computer power systems
• Cellular telephone power management
• Portable instrument power supplies
• LCD bias generators
• Battery backup supplies

Procurement Notes

Verify the specific suffix 'AR' against the manufacturer's official datasheet to confirm the exact temperature grade and package variant. Ensure the fixed 3.3 V output specification matches the design requirements, as other variants offer different fixed voltages or adjustable outputs. Cross-reference the RoHS compliance status and lead times directly with authorized distributors prior to ordering.

Selection Notes

Select this component when a highly integrated, low-quiescent current solution is required for portable applications. The fixed 3.3 V output simplifies design compared to adjustable versions. Consider the internal 1 A switch capability for load requirements and utilize the built-in current limit for robustness. Verify that the 2.0 V to 30 V input range covers the system's operational envelope.

Part Context

The ADP1108 belongs to a family of micropower DC/DC converters designed for space-constrained portable electronics. It serves as a cost-effective alternative to linear regulators in battery-powered systems where efficiency is critical. The series includes variants with different fixed output voltages and adjustable options, sharing common architectural features like the internal power switch and low standby current.

Replacement Considerations

Direct replacements include the LT1108CS8-5#PBF for 5V output applications or the ADP1108AR-5 for identical functionality at 5V. For adjustable output needs, consider the ADP1109 series. Verify pin compatibility and thermal performance when substituting.