LT1117

PRODUCTION

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

Data Sheet Product Selection Table
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Overview

  • 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

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.

Applications

  • Active SCSI Terminators
  • High Efficiency Linear Regulators
  • Post Regulators for Switching Supplies
  • Battery Chargers
  • 5V to 3.3V Linear Regulators
LT1117
800mA Low Dropout Positive Regulators Adjustable and Fixed 2.85V,3.3V, 5V
Active Terminator for SCSI-2 Bus Dropout Voltage (VIN – VOUT) Product Package 1 Product Package 2
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Documentation

Data Sheet 1

Reliability Data 1

Application Note 2

Design Note 4

Data Sheet

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
LDO Linear Regulators 1
LT3088
RECOMMENDED FOR NEW DESIGNS 800mA Single Resistor Rugged Linear Regulator
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Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

  • LT1117
  • LT1117-2.85
  • LT1117-3.3
  • LT1117-5
LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Reference Designs

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LTC Parts List
DK-N2EVAL-3C25N Block Diagram
Altera Nios II Embedded Evaluation Kit, Cyclone III Edition Circuits from the lab

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Features and Benefits

  • Analog Devices has worked closely with FPGA and processor manufacturers to develop verified power solutions that optimize cost, size and efficiency in high performance applications
  • Our reference designs are supported by an intuitive design tool set and IP
  • Our team can provide designs for quick prototypes that can speed time to market in the most complex applications
TR4 Stratix IV Board
TR4 Stratix IV Board
LTC Parts List
TR4 Stratix IV Block Diagram
TR4 Stratix IV Power Tree
Terasic TR4 Stratix IV Board Circuits from the lab

View Detailed Reference Design

Features and Benefits

  • Analog Devices has worked closely with FPGA and processor manufacturers to develop verified power solutions that optimize cost, size and efficiency in high performance applications
  • Our reference designs are supported by an intuitive design tool set and IP
  • Our team can provide designs for quick prototypes that can speed time to market in the most complex applications
DK-START-3C25N Kit
DK-START-3C25N Kit
LTC Parts
DK-START-3C25N Block Diagram
Altera Cyclone III FPGA Starter Kit Circuits from the lab

View Detailed Reference Design

Features and Benefits

  • Analog Devices has worked closely with FPGA and processor manufacturers to develop verified power solutions that optimize cost, size and efficiency in high performance applications
  • Our reference designs are supported by an intuitive design tool set and IP
  • Our team can provide designs for quick prototypes that can speed time to market in the most complex applications
Altera Nios II Embedded Evaluation Kit, Cyclone III Edition
View 1
View 2
LTC Parts List
DK-N2EVAL-3C25N Block Diagram
Terasic TR4 Stratix IV Board
TR4 Stratix IV Board
LTC Parts List
TR4 Stratix IV Block Diagram
TR4 Stratix IV Power Tree
Altera Cyclone III FPGA Starter Kit
DK-START-3C25N Kit
LTC Parts
DK-START-3C25N Block Diagram

Latest Discussions

31 Weeks Ago
Was looking at part LT1117IST-3.3#PBF and was interested in if it was ESD sensitive and how much if so
1 Years Ago
Question about LT1117-5
4 Years Ago
For pin 1 orientation
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