AMS1117-2.5

Overview

The AMS1117-2.5 is a positive low dropout linear voltage regulator providing a fixed 2.5V output with a maximum current capability of 1A. It operates within an input voltage range up to 18V and maintains stability across a junction temperature range of -40°C to +125°C. The device features a typical dropout voltage of 1.2V at full load, ensuring efficient power management in low-voltage applications. Fixed versions offer output accuracy better than 1.5%, while the adjustable variant provides 2% accuracy. Integrated protection mechanisms include thermal shutdown and current limiting to safeguard against overload conditions.

Feature Summary

• Fixed 2.5V output with less than 1.5% tolerance
• Integrated thermal shutdown for overload protection
• Current limiting function prevents excessive stress
• Low dropout voltage operation down to 1.2V

Applications

• Battery chargers
• Portable instrumentation
• Cellular phones
• Cordless telephones
• SMPS post-regulators

Procurement Notes

Verify the manufacturer source, as AMS1117 devices are produced by multiple vendors including AMS and others. Confirm the specific package type (SOT-223-3L, TO-252-2L, or SOT-89-3L) matches the design requirements. Ensure the component meets RoHS compliance standards if required by the target market regulations. Check datasheet revisions for any updates to electrical characteristics or pin configurations before finalizing procurement.

Selection Notes

Select this regulator when a stable 2.5V supply is needed from higher input voltages with minimal heat dissipation. The low dropout characteristic makes it suitable for battery-powered systems where input voltage may drop close to the output level. Consider the thermal resistance of the chosen package to ensure adequate heat dissipation under maximum load conditions. Verify that the required output capacitance is compatible with the stability requirements of the LDO.

Part Context

The AMS1117 series comprises adjustable and fixed voltage regulators designed for high-efficiency linear regulation. It is available in various fixed output voltages including 1.2V, 1.5V, 1.8V, 3.3V, and 5.0V, alongside an adjustable version. The series is widely used in portable electronics due to its compact surface-mount packages and robust protection features. It serves as a reliable solution for post-regulation in switching power supplies and direct battery powering applications.

Replacement Considerations

Compatible substitutes include other AMS1117 variants with different fixed outputs (e.g., AMS1117-3.3, AMS1117-5.0) or the adjustable version (AMS1117-ADJ). Ensure the replacement part shares the same pinout configuration and package type to maintain board compatibility. Verify that the substitute meets the same electrical specifications regarding current capacity and dropout voltage.