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Product Detailed Parameters
- Description：IC REG LINEAR 1.8V 800MA 8-WSON
- Series：-
- Mfr：National Semiconductor
- Package：Bulk
- Output Configuration：Positive
- Output Type：Fixed
- Number of Regulators：1
- Voltage - Input (Max)：15V
- Voltage - Output (Min/Fixed)：1.8V
- Voltage - Output (Max)：-
- 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：8-WDFN Exposed Pad
- Supplier Device Package：8-WSON (4x4)
- Grade：-
- Qualification：-
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Overview
The LM1117LDX-1.8/NOPB is an adjustable positive low-dropout linear regulator manufactured by Texas Instruments, continuing the National Semiconductor lineage. It provides a regulated output voltage ranging from 1.25 V to 13.8 V with a maximum output current of 0.8 A. The device features a nominal dropout voltage of 1.2 V and a maximum of 1.3 V at full load. It operates within a junction temperature range up to 125 °C and utilizes an 8-pin LLP package.
Feature Summary
- Adjustable output voltage capability spanning 1.25 V to 13.8 V via external resistors
- Low dropout performance ensuring efficient regulation under varying input conditions
- Integrated thermal shutdown and safe operating area protection for reliability
Applications
- Battery-powered systems requiring stable voltage rails
- Post-regulation for switching power supplies
- General-purpose linear regulation in portable electronics
Procurement Notes
Verify the manufacturer designation carefully, as the part originates from National Semiconductor but is now produced and distributed by Texas Instruments. Confirm the specific suffix 'NOPB' indicates lead-free and RoHS compliance status according to the latest datasheet revision. Ensure the LLP-8 package variant matches your PCB footprint requirements before ordering.
Selection Notes
Select this component when an adjustable positive voltage rail is required with moderate current demands up to 800 mA. It is suitable for applications where input-to-output differential voltage remains within the specified limits to maintain regulation. Consider the thermal dissipation capabilities of the LLP-8 package relative to the expected ambient temperature and load current.
Part Context
This component belongs to the LM1117 family of low-dropout regulators, widely used for providing stable DC voltages. The 'LDX' suffix typically denotes a tape-and-reel packaging format for surface-mount assembly. The 'ADJ' functionality allows flexibility in setting output levels, distinguishing it from fixed-voltage variants within the same series.
Replacement Considerations
Direct substitutes include other LM1117-ADJ variants such as LM1117IDT-ADJ/NOPB or LM1117S-ADJ/NOPB, provided the package type (TO-252 or TO-263) and pinout are compatible with the existing design. Verify thermal resistance values if replacing with a different package style.
