LT1117 - 800mA Low Dropout Positive Regulators Adjustable and Fixed 2.85V,3.3V, 5V

Features

  • Space Saving SOT-223 Surface Mount Package
  • 3-Terminal Adjustable or Fixed 2.85V, 3.3V, 5V
  • Output Current of 800mA
  • Operates Down to 1V Dropout
  • Guaranteed Dropout Voltage at Multiple Current Levels
  • 0.2% Line Regulation Max
  • 0.4% Load Regulation Max
Designed for Automotive and Transportation Applications
AEC-Q100 data available for specific packages


Typical Application

LT1117 Typical Application
LT1117 Typical Application

Description

The LT1117 is a positive low dropout regulator designed to provide up to 800mA of output current. The device is available in an adjustable version and fixed output voltages of 2.85V, 3.3V and 5V. The 2.85V version is designed specifically to be used in Active Terminators for the SCSI bus. All internal circuitry is designed to operate down to 1V input to output differential. Dropout voltage is guaranteed at a maximum of 1.2V at 800mA, decreasing at lower load currents. On chip trimming adjusts the reference/output voltage to within ± 1%. Current limit is also trimmed in order to minimize the stress on both the regulator and the power source circuitry under overload conditions.

The low profile surface mount SOT-223 package allows the device to be used in applications where space is limited. The LT1117 requires a minimum of 10μF of output capacitance for stability. Output capacitors of this size or larger are normally included in most regulator designs.

Unlike PNP type regulators where up to 10% of the output current is wasted as quiescent current, the quiescent current of the LT1117 flows into the load, increasing efficiency.

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing
RoHS
LT1117CM-2.85#PBF DDPAK-3 M C 05-08-1460 Yes
LT1117CM-2.85#TRPBF DDPAK-3 M C 05-08-1460 Yes
LT1117CM-3.3#PBF DDPAK-3 M C 05-08-1460 Yes
LT1117CM-3.3#TRPBF DDPAK-3 M C 05-08-1460 Yes
LT1117CM-5#PBF DDPAK-3 M C 05-08-1460 Yes
LT1117CM-5#TRPBF DDPAK-3 M C 05-08-1460 Yes
LT1117CM#PBF DDPAK-3 M C 05-08-1460 Yes
LT1117CM#TRPBF DDPAK-3 M C 05-08-1460 Yes
LT1117CST-2.85#PBF SOT-223 ST C 05-08-1630 Yes
LT1117CST-2.85#TRPBF SOT-223 ST C 05-08-1630 Yes
LT1117CST-3.3#PBF SOT-223 ST C 05-08-1630 Yes
LT1117CST-3.3#TRPBF SOT-223 ST C 05-08-1630 Yes
LT1117CST-5#PBF SOT-223 ST C 05-08-1630 Yes
LT1117CST-5#TRPBF SOT-223 ST C 05-08-1630 Yes
LT1117CST#PBF SOT-223 ST C 05-08-1630 Yes
LT1117CST#TRPBF SOT-223 ST C 05-08-1630 Yes
LT1117IST-2.85#PBF SOT-223 ST I 05-08-1630 Yes
LT1117IST-2.85#TRPBF SOT-223 ST I 05-08-1630 Yes
LT1117IST-3.3#PBF SOT-223 ST I 05-08-1630 Yes
LT1117IST-3.3#TRPBF SOT-223 ST I 05-08-1630 Yes
LT1117IST-5#PBF SOT-223 ST I 05-08-1630 Yes
LT1117IST-5#TRPBF SOT-223 ST I 05-08-1630 Yes
LT1117IST#PBF SOT-223 ST I 05-08-1630 Yes
LT1117IST#TRPBF SOT-223 ST I 05-08-1630 Yes


LT1117 Package Drawing
LT1117 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LT1117CM-2.85#PBF DDPAK-3 C $2.58 $2.10 Yes
LT1117CM-2.85#TRPBF DDPAK-3 C $2.22 Yes
LT1117CM-3.3#PBF DDPAK-3 C $2.58 $2.10 Yes
LT1117CM-3.3#TRPBF DDPAK-3 C $2.23 Yes
LT1117CM-5#PBF DDPAK-3 C $2.58 $2.10 Yes
LT1117CM-5#TRPBF DDPAK-3 C $2.23 Yes
LT1117CM#PBF DDPAK-3 C $2.58 $2.10 Yes
LT1117CM#TRPBF DDPAK-3 C $2.23 Yes
LT1117CST-2.85#PBF SOT-223 C $2.42 $1.90 Yes
LT1117CST-2.85#TRPBF SOT-223 C $1.96 Yes
LT1117CST-3.3#PBF SOT-223 C $2.42 $1.90 Yes
LT1117CST-3.3#TRPBF SOT-223 C $1.96 Yes
LT1117CST-5#PBF SOT-223 C $2.42 $1.90 Yes
LT1117CST-5#TRPBF SOT-223 C $1.96 Yes
LT1117CST#PBF SOT-223 C $2.42 $1.90 Yes
LT1117CST#TRPBF SOT-223 C $1.96 Yes
LT1117IST-2.85#PBF SOT-223 I $2.52 $2.20 Yes
LT1117IST-2.85#TRPBF SOT-223 I $2.26 Yes
LT1117IST-3.3#PBF SOT-223 I $2.52 $2.20 Yes
LT1117IST-3.3#TRPBF SOT-223 I $2.26 Yes
LT1117IST-5#PBF SOT-223 I $2.52 $2.20 Yes
LT1117IST-5#TRPBF SOT-223 I $2.26 Yes
LT1117IST#PBF SOT-223 I $2.52 $2.20 Yes
LT1117IST#TRPBF SOT-223 I $2.26 Yes
Buy NowRequest Samples
* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Click here to view our complete list of demo boards

Designed for Automotive and Transportation Applications

AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LT1117IST-2.85#PBF SOT-223 I $2.52 $2.20 Yes
LT1117IST-2.85#TRPBF SOT-223 I $2.26 Yes
LT1117IST-3.3#PBF SOT-223 I $2.52 $2.20 Yes
LT1117IST-3.3#TRPBF SOT-223 I $2.26 Yes
LT1117IST-5#PBF SOT-223 I $2.52 $2.20 Yes
LT1117IST-5#TRPBF SOT-223 I $2.26 Yes
LT1117IST#PBF SOT-223 I $2.52 $2.20 Yes
LT1117IST#TRPBF SOT-223 I $2.26 Yes
Buy NowRequest Samples
* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Applications

  • Active SCSI Terminators
  • High Efficiency Linear Regulators
  • Post Regulators for Switching Supplies
  • Battery Chargers
  • 5V to 3.3V Linear Regulators

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Design Tools

LTspice

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Models for the following parts are available in LTspice:
LT1117
LT1117-2.85
LT1117-3.3
LT1117-5

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