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Product Detailed Parameters
- Description：IC REG LINEAR POS ADJ 1A SOT89
- Series：-
- Mfr：TAEJIN
- Package：Tape & Reel (TR)
- Output Configuration：Positive
- Output Type：Adjustable
- Number of Regulators：1
- Voltage - Input (Max)：20V
- Voltage - Output (Min/Fixed)：1.25V
- Voltage - Output (Max)：18.7V
- Voltage Dropout (Max)：1.3V @ 1A
- Current - Output：1A
- Current - Quiescent (Iq)：10 mA
- Current - Supply (Max)：-
- PSRR：75dB (120Hz)
- Control Features：-
- Protection Features：Over Current, Over Temperature
- Operating Temperature：-40°C ~ 125°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：TO-243AA
- Supplier Device Package：SOT-89
- Grade：-
- Qualification：-
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Overview
The LM1117F-ADJ is a three-terminal adjustable positive low-dropout linear voltage regulator manufactured by TAEJIN (HTC Korea). It provides up to 1.0A output current with a maximum dropout voltage of 1.2V at full load. The device operates within an input voltage range of up to 20V and delivers an adjustable output voltage from 1.25V to 13.8V, determined by external resistors. It features a reference voltage of 1.25V typical value. The component is housed in a SOT-89-3L surface-mount package and supports an operating junction temperature range from -40°C to +125°C.
Feature Summary
- Low dropout performance ensuring high efficiency under varying load conditions
- Integrated internal current limiting and thermal shutdown protection mechanisms
- Adjustable output voltage configuration via external resistor network
- High line and load regulation stability across specified operating ranges
Applications
- Active SCSI bus terminators
- Portable and notebook computer power supplies
- SMPS post-regulators for improved system performance
- Motherboard clock supply circuits
- Battery charger systems
Procurement Notes
Verify the manufacturer origin as HTC Korea/TAEJIN rather than Texas Instruments when sourcing this specific part number. Confirm the SOT-89-3L package type matches your PCB footprint requirements. Ensure the ordering suffix corresponds to the Tape & Reel delivery format listed in the official documentation. Cross-reference the datasheet revision date to confirm electrical characteristics alignment with your design specifications.
Selection Notes
Select this component when a compact surface-mount solution is required for 1A current applications. The SOT-89 package offers a smaller footprint compared to TO-252 or SOT-223 alternatives. Consider the thermal resistance limits of the SOT-89 package when designing for high power dissipation scenarios. Verify that the required output voltage falls within the adjustable range supported by the external resistor divider circuit.
Part Context
This device belongs to the LM1117 family of low-dropout regulators produced by HTC Korea. While functionally similar to industry-standard parts, it carries specific manufacturer markings such as '1117C ADJ'. The family includes fixed voltage variants alongside the adjustable version. It serves as a cost-effective alternative for portable electronics requiring efficient linear regulation in space-constrained designs.
Replacement Considerations
LM1117S-ADJ (SOT-223 package)
FAQ
What is the minimum output capacitor requirement for stability?
An output capacitor of 10 µF or larger is required for output stability.
How does the dropout voltage vary with load current?
The dropout voltage is typically 1.0V at 100mA, 1.1V at 500mA, and 1.2V at 1A output current.
