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LM1117 Voltage Regulator: Pinout, Datasheet, Circuit [Video]

Author: Mia Date: 30 Mar 2021  139

lm1117 datasheet

LM1117 is a low dropout voltage regulator with a dropout of 1.2V at 800 mA of load current. It is available in an adjustable version, which can set the output voltage from 1.25 to 13.8V with only two external resistors. In addition, it is available in five fixed voltages, 1.8V, 2.5V, 3.3V, and 5V.

Using LM1117 DIY a Variable Voltage Regulator (A Timelapse)


Catalog

LM1117 Pinout

LM1117 Features

LM1117 Parameter

LM1117 Alternatives

Where to Use LM1117

How to Use LM1117

LM1117 Applications

LM1117 Package

Component Datasheet

FAQ


LM1117 Pinout

LM1117 Pinout

 

Pin Name Description
Adjust/Ground This pins adjusts the output voltage, if it is a fixed voltage regulator it acts as ground
Output Voltage (Vout) The regulated output voltage set by the adjust pin can be obtained from this pin
Input Voltage (Vin) The input voltage which has to be regulated is given to this pin

LM1117 Features

  • Fixed/Adjustable 3-terminal Linear voltage regulator

  • Fixed Voltage type: 1.8V, 2.5V, 3.3V and 5V

  • Variable Voltage range: 1.25V to 13.8V

  • Output current is 800mA

  • In-built Current Limiting and thermal protection.

  • Operating junction temperature is 125°C

  • Available in To-220, SOT223, TO263 Package

 


LM1117 Parameter

Manufacturer: Texas Instruments
Series: -
Packaging: Tape & Reel (TR)
Part Status: Active
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): 5mA
Current - Supply (Max): 10mA
PSRR: 75dB (120Hz)
Control Features: -
Protection Features: Over Current Over Temperature
Operating Temperature: 0°C ~ 125°C
Mounting Type: Surface Mount
Package / Case: TO-261-4 TO-261AA
Supplier Device Package: SOT-223
Base Part Number: LM1117

LM1117 Alternatives

Alterbative Voltage Regulators: LM7805, LM7806, LM7809, LM7812, LM7905, LM7912, LM117V33, XC6206P332MR.

LM1117 Equivalent: LM317


Where to Use LM1117

Like the famous 7805 and LM317 series, the LM1117 is another linear voltage regulator. It is known for its small form factor as 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 of between 1.25V and 13.8V.

 

So if you're looking for an SMD component voltage regulator, this IC might be the right choice for you.


How to Use LM1117

Using the LM1117 is pretty straight forward. If it is a fixed voltage regulator, the IC can be powered by the Vin pin, and the regulated output can be obtained by the Vout pin. In this case, the Adj/Ground pin acts only as a ground pin and is grounded. A capacitor can also be added to the output side to filter out the noise. The circuit diagram for a fixed output regulator is shown below.

 

LM1117 Fixed Output Regulator Circuit

LM1117 Fixed Output Regulator Circuit

 

For the Adjustable type voltage regulator, we need two external resistors to determine the output voltage of the regulator. A reference circuit diagram is shown below, where the R1 and R2 resistors determine the output voltage of the regulator. The CAdj capacitor is an optional component that can be added to improve ripple rejection if required. The other two capacitors are used to filter input and output noise, respectively.

LM1117 Adjustable Output Regulator Circuit

LM1117 Adjustable Output Regulator Circuit

 

The formulas for calculating the output voltage of the regulator are given below. Select the R1 and R2 values based on the output voltage required for your project. Keep in mind that the R1 value should be less than 1k. You can use the R2 variable resistor if you want to change the voltage in real time.

 

VOUT = 1.25×1+(R2/R1))

 

With the ability to be used as a fixed voltage or variable voltage regulator,  the LM1117 often finds its application in battery charging circuit and can also be designed to provide negative voltage if required. Please refer to the datasheet at the end of this page to find more application circuits for this IC.


LM1117 Applications

  • Used for Positive voltage regulations

  • Variable power supply

  • Current limiting circuits

  • Reverse polarity circuits

  • Commonly used in Desktop PC, DVD and other consumer products

  • Used in motor control circuits


LM1117 Package

LM1117 Package


Component Datasheet

LM1117 Voltage Regulator Datasheet


FAQ

  • What is LM1117?
The LM1117 is a series of low dropout voltage regulators with a dropout of 1.2V at 800mA of load current. It has the same pin-out as National Semiconductor's industry standard LM317. The LM1117 is available in an adjustable version, which can set the output voltage from 1.25V to 13.8V with only two external resistors.
  • What is the relationship between the voltage of the output and adjust pins of the LM1117 when in normal operation?
 The LM1117 regulates the voltage that appears between its output and ground pins, or between its output and adjust pins. In some cases, line resistances can introduce errors to the voltage across the load.
  • How does the regulator work?

A voltage regulator generates a fixed output voltage of a preset magnitude that remains constant regardless of changes to its input voltage or load conditions. ... A switching regulator converts the dc input voltage to a switched voltage applied to a power MOSFET or BJT switch.

 

 

Ordering & Quality

Photo Mfr. Part # Company Description Package PDF Qty Pricing
(USD)
LM1117DT-3-3-NOPB Company:Texas Instruments Remark:IC REG LINEAR 3.3V 800MA TO252-3 Package:TO-252-3, DPak (2 Leads + Tab), SC-63
DataSheet
In Stock:4057
Inquiry
Price:
1+: $1.48000
10+: $1.33000
25+: $1.25520
100+: $1.00400
250+: $0.87852
500+: $0.85340
1000+: $0.67770
2500+: $0.65260
5000+: $0.62750
Inquiry
LM1117DTX-3-3-NOPB Company:Texas Instruments Remark:Linear Voltage Regulator IC 1 Output 800mA TO-252-3 Package:TO-252-3, DPak (2 Leads + Tab), SC-63
DataSheet
In Stock:On Order
Inquiry
Price:
1+: $1.44000
10+: $1.28300
25+: $1.21800
100+: $0.93530
250+: $0.82652
500+: $0.78300
1000+: $0.60900
2500+: $0.57855
5000+: $0.55680
10000+: $0.53940
25000+: $0.52200
Inquiry
LM1117DTX-ADJ-NOPB LM1117DTX-ADJ-NOPB Company:Texas Instruments Remark:IC REG LIN POS ADJ 800MA TO252-3 Package:TO-252-3, DPak (2 Leads + Tab), SC-63
DataSheet
In Stock:10000
Inquiry
Price:
2500+: $0.57855
5000+: $0.55680
12500+: $0.53940
25000+: $0.52200
Inquiry
LM1117IDT-3-3-NOPB Company:Texas Instruments Remark:Linear Voltage Regulator IC 1 Output 800mA TO-252-3 Package:TO-252-3, DPak (2 Leads + Tab), SC-63
DataSheet
In Stock:On Order
Inquiry
Price:
1+: $1.48000
10+: $1.33000
25+: $1.25520
100+: $1.00400
250+: $0.87852
500+: $0.85340
1000+: $0.67770
2500+: $0.65260
5000+: $0.62750
Inquiry
LM1117IDTX-3-3-NOPB Company:Texas Instruments Remark:IC REG LINEAR 3.3V 800MA TO252-3 Package:TO-252-3, DPak (2 Leads + Tab), SC-63
DataSheet
In Stock:17500
Inquiry
Price:
2500+: $0.57855
5000+: $0.55680
12500+: $0.53940
25000+: $0.52200
Inquiry
LM1117IMP-3-3-NOPB Company:Texas Instruments Remark:IC REG LINEAR 3.3V 800MA SOT223 Package:TO-261-4, TO-261AA
DataSheet
In Stock:14000
Inquiry
Price:
1000+: $0.46760
2000+: $0.44422
5000+: $0.42752
10000+: $0.41416
25000+: $0.40080
Inquiry
LM1117IMP-5-0-NOPB Company:Texas Instruments Remark:IC REG LINEAR 5V 800MA SOT223 Package:TO-261-4, TO-261AA
DataSheet
In Stock:1000
Inquiry
Price:
1000+: $0.46760
2000+: $0.44422
5000+: $0.42752
10000+: $0.41416
25000+: $0.40080
Inquiry
LM1117IMPX-3-3 LM1117IMPX-3-3 Company:Texas Instruments Remark:Linear Voltage Regulator IC 1 Output 800mA SOT-223-4 Package:TO-261-4, TO-261AA
N/A
In Stock:On Order
Inquiry
Price:
Call
Inquiry
LM1117IMPX-3-3-NOPB Company:Texas Instruments Remark:IC REG LIN 3.3V 800MA SOT223-4 Package:TO-261-4, TO-261AA
DataSheet
In Stock:22000
Inquiry
Price:
2000+: $0.44422
6000+: $0.42752
10000+: $0.41416
50000+: $0.40080
Inquiry
LM1117IMPX-5-0-NOPB Company:Texas Instruments Remark:IC REG LINEAR 5V 800MA SOT223-4 Package:TO-261-4, TO-261AA
DataSheet
In Stock:2000
Inquiry
Price:
2000+: $0.44422
6000+: $0.42752
10000+: $0.41416
50000+: $0.40080
Inquiry

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