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AMS1117-ADJ
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Product Detailed Parameters
- Description：IC REG LIN POS ADJ 1A SOT-223-3L
- Series：AMS1117
- Mfr：EVVO
- Package：Tape & Reel (TR),Cut Tape (CT)
- Output Configuration：Positive
- Output Type：Adjustable
- Number of Regulators：1
- Voltage - Input (Max)：12V
- Voltage - Output (Min/Fixed)：1.25V
- Voltage - Output (Max)：10.7V
- Voltage Dropout (Max)：1.3V @ 1A
- Current - Output：1A
- Current - Quiescent (Iq)：10 mA
- Current - Supply (Max)：-
- PSRR：75dB (120Hz)
- Control Features：Current Limit
- Protection Features：Over Current, Over Temperature
- Operating Temperature：-40°C ~ 125°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：TO-261-4, TO-261AA
- Supplier Device Package：SOT-223-3L
- Grade：-
- Qualification：-
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Overview
The EVVO AMS1117-ADJ is a positive low dropout linear regulator providing an adjustable output voltage. It delivers up to 1A of output current with a typical dropout voltage of 1.2V at full load. The device features thermal shutdown and current limiting protection mechanisms. It operates within an input voltage range of up to 18V and supports a junction temperature range from -40°C to 150°C, with recommended operating conditions up to 125°C.
Feature Summary
- Adjustable output voltage capability
- Integrated thermal shutdown protection
- Current limiting functionality
Applications
- Laptop, Palmtop, and Notebook Computers
- Battery Charger
- SCSI-II Active Terminator
- Cellular Phone
- Cordless Telephones
- Battery Powered Systems
- Portable Instrumentation
- SMPS Post-Regulator
Procurement Notes
Verify the specific package variant (SOT-223-3L, TO-252-2L, or SOT-89-3L) required for your design, as the AMS1117 series is available in multiple physical footprints. Confirm that the supplier provides the official datasheet matching the EVVO manufacturer designation to ensure electrical parameters like reference voltage and dropout characteristics align with system requirements.
Selection Notes
Select this component when an adjustable positive voltage rail is needed with high current capacity. Ensure the application circuit includes the necessary output capacitance, such as a 22µF tantalum capacitor, to maintain stability across all operating conditions. Consider the thermal resistance values provided for the chosen package to calculate power dissipation limits under maximum load currents.
Part Context
The AMS1117 series consists of positive low dropout regulators designed for general-purpose power management. The ADJ variant allows users to set the output voltage using external resistors, unlike fixed versions which provide standard voltages like 3.3V or 5.0V. This flexibility makes it suitable for diverse electronic products requiring customized supply rails.
Replacement Considerations
Compatible substitutes include other AMS1117-ADJ variants from different manufacturers offering identical pinouts and electrical specifications. Ensure replacement parts support the same SOT-223-3L, TO-252-2L, or SOT-89-3L package types to maintain mechanical compatibility.
FAQ
What is the typical dropout voltage at 1A load?
The typical dropout voltage is 1.2V when the output current is 1A.
How is the output voltage adjusted?
The output voltage is determined by the formula VOUT = VREF × (1 + R2/R1) + IADJ × R2, using external resistors connected to the adjustment pin.
What protection features are included?
The device includes thermal shutdown to prevent damage from excessive junction temperatures and current limiting to protect against overload conditions.
