The LM1117 is a versatile low-dropout (LDO) voltage regulator offering both fixed and adjustable output voltage configurations.
Understanding LM1117 Output Voltages
The output voltage of an LM1117 depends on the specific version of the device being used. It is available in pre-set fixed voltage models and an adjustable version, providing flexibility for various applications.
Fixed Output Voltage Options
For convenience and simplicity in design, the LM1117 comes in several popular fixed voltage outputs. These versions provide a stable and precise voltage without the need for external components to set the output level.
The standard fixed output voltages include:
| Output Voltage |
|---|
| 1.8 V |
| 2.5 V |
| 3.3 V |
| 5 V |
Adjustable Output Voltage Range
Beyond the fixed versions, the LM1117 is also available as an adjustable voltage regulator. This allows designers to set a custom output voltage within a specified range, tailoring it precisely to application requirements.
- The adjustable version can set the output voltage from 1.25 V to 13.8 V.
- Achieving the desired output voltage requires the use of only two external resistors. These resistors form a voltage divider network, which feeds back a portion of the output voltage to the adjust pin, thereby regulating the output to the desired level.
Key Features of the LM1117
Beyond its output voltage capabilities, the LM1117 is also equipped with built-in protection features to ensure reliability and device longevity. These include:
- Current Limiting: Protects the device and connected circuitry from excessive current draw.
- Thermal Shutdown: Shuts down the device if its internal temperature exceeds a safe operating limit, preventing damage due to overheating.
For detailed specifications and application information, refer to the official LM1117 data sheet.
