ADP1109AAN

Overview

The ADP1109AAN is a micropower step-up switching regulator manufactured by Analog Devices Inc. It operates from an input voltage range of 2 V to 9 V and provides fixed outputs of 3.3 V, 5 V, or 12 V, as well as an adjustable output configuration. The device delivers up to 1 A of output current with a typical ground current of 460 µA. It features a fixed oscillator frequency of 120 kHz and includes logic shutdown capability. Packaged in an 8-lead DIP format, it serves as a complete DC-to-DC converter solution requiring minimal external components.

Feature Summary

• Operates as a versatile step-up switching regulator within a 2 V to 9 V supply range
• Provides fixed 3.3 V, 5 V, 12 V, or adjustable output voltage options
• Features low quiescent current consumption for battery-powered applications
• Includes logic shutdown control for power management

Applications

• Cellular telephones
• Single-cell to 5 V converters
• Laptop and palmtop computers
• Portable instruments
• Battery backup supplies

Procurement Notes

Verify the specific suffix (e.g., -33, -5, -12) required for the target output voltage, as the base model number denotes the family rather than a single fixed voltage. Confirm package availability, as the DIP variant may have different lead times compared to SO-8 versions. Ensure compatibility with the 120 kHz switching frequency and 1 A current limit for the intended load requirements.

Selection Notes

Select this component when a low-cost, micropower boost converter is needed for portable electronics. Choose the appropriate voltage suffix based on the system requirement. Consider the 8-lead DIP package if through-hole mounting is preferred over surface mount alternatives. Verify that the input voltage stays within the 2 V to 9 V operational window for stable regulation.

Part Context

The ADP1109A belongs to the ADP1109A series of micropower DC-to-DC converters from Analog Devices. It is designed to replace linear regulators in battery-operated systems where efficiency is critical. The series includes variants with fixed 3.3 V, 5 V, and 12 V outputs, alongside an adjustable version, all sharing the same core topology and pinout.

Replacement Considerations

Direct replacements include other ADP1109A variants with different voltage suffixes (ADP1109AN-33, ADP1109AN-5, ADP1109AN-12). Cross-referencing with similar micropower boost converters from other manufacturers requires verification of pin compatibility and electrical specifications.