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Product Detailed Parameters
- Description：IC REG LIN POS ADJ 800MA DDPAK
- Series：-
- Mfr：National Semiconductor
- Package：Bulk
- Output Configuration：Positive
- Output Type：Adjustable
- Number of Regulators：1
- Voltage - Input (Max)：15V
- Voltage - Output (Min/Fixed)：1.25V
- Voltage - Output (Max)：13.8V
- Voltage Dropout (Max)：1.2V @ 800mA
- Current - Output：800mA
- Current - Quiescent (Iq)：5 mA
- Current - Supply (Max)：10 mA
- PSRR：75dB (120Hz)
- Control Features：-
- Protection Features：Over Current, Over Temperature
- Operating Temperature：0°C ~ 125°C
- Mounting Type：Surface Mount
- Package / Case：TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
- Supplier Device Package：DDPAK/TO-263-3
- Grade：-
- Qualification：-
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Overview
The LM1117S-ADJ is an adjustable positive low-dropout linear regulator manufactured by National Semiconductor. It provides a regulated output voltage ranging from 1.25 V to 13.8 V, determined by two external resistors. The device supports a maximum load current of 800 mA with a typical dropout voltage of 1.2 V at full load. It features a fixed internal reference voltage of 1.25 V and operates within a junction temperature range of -40°C to +125°C for the industrial grade variant. The component utilizes an SOT-223 surface-mount package.
Feature Summary
- Adjustable output voltage capability via external resistor network
- Low dropout voltage performance for efficient power conversion
- Integrated thermal shutdown and current limiting protection
Applications
- Battery-powered equipment requiring stable voltage regulation
- Post-regulation stages in switch-mode DC/DC converters
- SCSI-2 active terminators
Procurement Notes
Verify that the specific procurement lot corresponds to the National Semiconductor manufacturing origin rather than Texas Instruments, as the company was acquired. Confirm the package designation matches the SOT-223 form factor required for the target PCB footprint. Ensure the component meets the necessary RoHS compliance standards if applicable to the final assembly requirements.
Selection Notes
Select this component when a reliable adjustable LDO is needed for currents up to 800 mA. It serves as a direct pin-compatible replacement for the LM317 in many designs while offering lower dropout characteristics. Consider the thermal dissipation capabilities of the SOT-223 package relative to the expected power loss during operation.
Part Context
This part belongs to the LM1117 family of low-dropout regulators, which includes both fixed voltage outputs (such as 3.3 V and 5.0 V) and adjustable variants. The 'S' suffix indicates the SOT-223 surface-mount package, distinguishing it from through-hole options like TO-220 or other surface packages like DPAK.
Replacement Considerations
The LM317 is a functional substitute but typically exhibits higher dropout voltage. Verify that any alternative adjustable LDO maintains compatibility with the existing output capacitor ESR requirements to prevent oscillation.
