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Product Detailed Parameters
- Description：IC REG LINEAR 3.3V 800MA 8-WSON
- Series：LM1117-3.3
- Mfr：Texas Instruments
- Package：Tape & Reel (TR)
- Output Configuration：Positive
- Output Type：Fixed
- Number of Regulators：1
- Voltage - Input (Max)：15V
- Voltage - Output (Min/Fixed)：3.3V
- 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-3.3/NOPB is a fixed-output low-dropout linear regulator from Texas Instruments, providing a stable 3.3V output with a maximum load current of 800 mA. It operates within an input voltage range up to 15 V and features a typical dropout voltage of 1.2 V at full load. The device incorporates internal current limiting and thermal shutdown protection mechanisms. It utilizes a Zener-trimmed bandgap reference to ensure output voltage accuracy within ±1%. The component is housed in an 8-pin WSON package measuring 4.00 mm by 4.00 mm.
Feature Summary
- Integrated current limiting and thermal shutdown for robust operation under fault conditions
- Zener-trimmed bandgap reference ensures high output voltage accuracy
- Space-saving surface-mount packaging options available
Applications
- Post regulator for switching DC-DC converters
- High efficiency linear regulators
- Battery chargers
- Portable instrumentation power supplies
Procurement Notes
Verify the specific suffix 'LDX' against the manufacturer's official orderable addendum, as standard datasheets primarily list MPX, IDTX, and IMP variants. Confirm that the WSON package designation matches the required footprint for PCB layout. Ensure the component meets RoHS compliance requirements if applicable to the target assembly process.
Selection Notes
Select this component when a fixed 3.3V rail is required with moderate current demands up to 800 mA. Consider the WSON package for applications requiring minimal board space compared to TO-220 or SOT-223 alternatives. Verify that the input voltage headroom exceeds the 1.2 V dropout requirement across the entire operating temperature range to maintain regulation.
Part Context
This part belongs to the LM1117 family of low-dropout regulators produced by Texas Instruments. The family includes adjustable versions and other fixed voltage outputs such as 1.8 V, 2.5 V, and 5.0 V. The LM1117 series is widely used in portable electronics due to its high ripple rejection and compact package options, offering a reliable solution for linear power management tasks.
Replacement Considerations
LM1117MPX-3.3/NOPB
FAQ
What type of output capacitor is required for stability?
A minimum of 10 µF tantalum capacitor is required at the output to improve transient response and ensure regulator stability.
How is the output voltage accuracy maintained?
Accuracy is maintained through a Zener-trimmed bandgap reference circuit, which assures output voltage accuracy within ±1%.
