IC REG LINEAR 3.3V 800MA TO220-3 The LM1117 is a low dropout voltage regulator with a dropout of 1.2V at 800 MA of load current. This article introduces pinout, Features,
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Jun 27, 2021
Jacob Clarissa
1117, 3.3V Voltage Regulator IC : Tutorial 10
IC REG LINEAR 3.3V 800MA TO220-3
The LM1117 is a low dropout voltage regulator with a dropout of 1.2V at 800 MA of load current. This article introduces pinout, Features, CAD Model and other detail information of LM1117.
LM1117T-3.3
The LM1117 is a low dropout voltage regulator with a dropout of 1.2V at 800 MA of load current. The LM1117 is available in an adjustable version, which can set the output voltage from 1.25 to 13.8 V with only two external resistors.
Symbol
Footprint
3D Model
• Available in 1.8 V, 2.5 V, 3.3 V, 5 V, and Adjustable Versions
• Space-Saving SOT-223 and WSON Packages
• Current Limiting and Thermal Protection
• Output Current 800 mA
• Line Regulation 0.2% (Maximum)
• Load Regulation 0.4% (Maximum)
• Temperature Range
– LM1117: 0°C to 125°C to within ±1%.
– LM1117I: −40°C to 125°C
Texas Instruments LM1117T-3.3 technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments LM1117T-3.3.
Texas Instruments LM1117T-3.3 technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments LM1117T-3.3.
| Product Attribute | Attribute Value | |
|---|---|---|
| Mount | Through Hole | |
| Mounting Type | Through Hole | |
| Package / Case | TO-220-3 | |
| Number of Pins | 3Pins | |
| Operating Temperature | 0°C~125°C | |
| Packaging | Tube | |
| Series | LM1117-3.3 | |
| JESD-609 Code | e0 | |
| Pbfree Code | no | |
| Part Status | Obsolete | |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | |
| Number of Terminations | 3Terminations | |
| ECCN Code | EAR99 | |
| Terminal Finish | Tin/Lead (Sn/Pb) |
| Product Attribute | Attribute Value | |
|---|---|---|
| Terminal Position | SINGLE | |
| Number of Functions | 1Function | |
| Terminal Pitch | 2.54mm | |
| Current Rating | 800A | |
| Base Part Number | LM1117 | |
| Current - Supply (Max) | 10mA | |
| Number of Outputs | 1Output | |
| Voltage - Input (Max) | 15V | |
| Output Type | Fixed | |
| Current - Output (Max) | 800mA | |
| Output Configuration | Positive | |
| Quiescent Current | 5mA | |
| Accuracy | 1 % | |
| Voltage - Output | 3.3V |
| Product Attribute | Attribute Value | |
|---|---|---|
| Output Voltage 1 | 3.3V | |
| Number of Regulators | 1Regulator | |
| Protection Features | Over Current, Over Temperature | |
| Voltage Dropout (Max) | 1.2V @ 800mA | |
| PSRR | 75dB (120Hz) | |
| Dropout Voltage | 1.2V | |
| Dropout Voltage1-Nom | 1.2V | |
| Voltage Tolerance-Max | 2% | |
| Min Current Limit | 800mA | |
| Nominal Output Voltage | 3.3V | |
| Output Voltage Accuracy | 1 % | |
| REACH SVHC | No SVHC | |
| Radiation Hardening | No | |
| RoHS Status | Non-RoHS Compliant |
Just like the famous 7805 and LM317, the LM1117 is another Linear Voltage regulator. It is known for its small form factor since it is available as a DCY Package (SMD Component). There are many types of LM1117, the fixed types provide a fixed output voltage of 1.8V, 2.5V, 3.3V or 5V and the variable voltage regulator can have a variable voltage from 1.25V to 13.8V.
So if you are looking for a SMD component voltage regulator then this IC might be the right choice for you.
Using the LM1117 is pretty much straight forward. If it a fixed voltage regulator just power the IC though the Vin pin and the regulated output can be obtained in the Vout pin. The Adj/Ground pin in this case acts only as a ground pin and is grounded. Also a capacitor can be added at the output side to filter out the noise. The circuit diagram for a fixed output regulator is show below
For an Adjustable type voltage regulator we need two external resistors to decide the output voltage of the Regulator. A reference circuit diagram is shown below, where the resistors R1 and R2 decides the output voltage of the regulator. The capacitor CAdj is an optional component which can be added to improve ripple rejection if required. The other two capacitors are to filter the input and output noise respectively.
The formulae to calculate the output voltage of the regulator is given below. Select the value of R1 and R2 based on the output voltage required for your project. Keep in mind that the value of R1 should be less than 1k. You can use a variable resistor at R2 if you want to vary the voltage in real time.
VOUT = 1.25 × (1 + (R2/R1))
With the ability to be used as a fixed voltage or a variable voltage regulator the LM1117 often finds its application in battery charging circuit and can also be designed to provide negative voltage if required. Refer the datasheet at the end of this page to find more application circuits for this IC.
• Post Regulator for Switching DC–DC Converter1
• High Efficiency Linear Regulators
• Battery Chargers
• Portable Instrumentation
• Active SCSI Termination Regulator
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Download datasheets and manufacturer documentation for Texas Instruments LM1117T-3.3.
Download datasheets and manufacturer documentation for LM1117T-3.3
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