LT1171
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LT1171

100kHz, 5A, 2.5A and 1.25A High Efficiency Switching Regulators

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Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
Part Models 14
1ku List Price Starting From $6.15
Features
  • Wide Input Voltage Range: 3V to 60V
  • Low Quiescent Current: 6mA
  • Internal 5A Switch (2.5A for LT1171, 1.25A for LT1172)
  • Shutdown Mode Draws Only 50μA Supply Current
  • Very Few External Parts Required
  • Self-Protected Against Overloads
  • Operates in Nearly All Switching Topologies
  • Flyback-Regulated Mode Has Fully Floating Outputs
  • Comes in Standard 5-Pin Packages
  • LT1172 Available in 8-Pin MiniDIP and Surface Mount Packages
  • Can Be Externally Synchronized
Additional Details
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The LT1170/LT1171/LT1172 are monolithic high power switching regulators. They can be operated in all standard switching configurations including buck, boost, flyback, forward, inverting and “Cuk.” A high current, high efficiency switch is included on the die along with all oscillator, control and protection circuitry. Integration of all functions allows the LT1170/LT1171/LT1172 to be built in a standard 5-pin TO-3 or TO-220 power package as well as the 8-pin packages (LT1172). This makes them extremely easy to use and provides “bust proof” operation similar to that obtained with 3-pin linear regulators.

The LT1170/LT1171/LT1172 operate with supply voltages from 3V to 60V, and draw only 6mA quiescent current. They can deliver load power up to 100W with no external power devices. By utilizing current-mode switching techniques, they provide excellent AC and DC load and line regulation.

The LT1170/LT1171/LT1172 have many unique features not found even on the vastly more difficult to use low power control chips presently available. They use adaptive antisat switch drive to allow very wide ranging load currents with no loss in efficiency. An externally activated shutdown mode reduces total supply current to 50μA typically for standby operation.

Applications

  • Logic Supply 5V at 10A
  • 5V Logic to ±15V Op Amp Supply
  • Battery Upconverter
  • Power Inverter (+ to –) or (– to +)
  • Fully Floating Multiple Outputs

User Note:

This data sheet is only intended to provide specifications, graphs, and a general functional description of the LT1170/LT1171/LT1172. Application circuits are included to show the capability of the LT1170/LT1171/LT1172. A complete design manual (AN19) should be obtained to assist in developing new designs. This manual contains a comprehensive discussion of both the LT1070 and the external components used with it, as well as complete formulas for calculating the values of these components. The manual can also be used for the LT1170/LT1171/LT1172 by factoring in the higher frequency. A CAD design program called SwitcherCAD® is also available.

Part Models 14
1ku List Price Starting From $6.15

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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Product Lifecycle

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Aug 10, 2022

- 22_0175

Laser Top Mark Conversion for DDPAK & TO220 Packages Assembled in ADPG. Country of Origin Code [MY] To Be Incorporated On Top Mark

LT1171CQ#PBF

PRODUCTION

LT1171CQ#TRPBF

PRODUCTION

LT1171CT#06PBF

PRODUCTION

LT1171CT#PBF

PRODUCTION

LT1171HVCQ#PBF

PRODUCTION

LT1171HVCQ#TRPBF

PRODUCTION

LT1171HVCT#30PBF

PRODUCTION

LT1171HVCT#PBF

PRODUCTION

LT1171HVIQ#PBF

PRODUCTION

LT1171HVIQ#TRPBF

PRODUCTION

LT1171HVIT#PBF

PRODUCTION

LT1171IQ#PBF

PRODUCTION

LT1171IQ#TRPBF

PRODUCTION

LT1171IT#PBF

PRODUCTION

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Aug 10, 2022

- 22_0175

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Laser Top Mark Conversion for DDPAK & TO220 Packages Assembled in ADPG. Country of Origin Code [MY] To Be Incorporated On Top Mark

LT1171CQ#PBF

PRODUCTION

LT1171CQ#TRPBF

PRODUCTION

LT1171CT#06PBF

PRODUCTION

LT1171CT#PBF

PRODUCTION

LT1171HVCQ#PBF

PRODUCTION

LT1171HVCQ#TRPBF

PRODUCTION

LT1171HVCT#30PBF

PRODUCTION

LT1171HVCT#PBF

PRODUCTION

LT1171HVIQ#PBF

PRODUCTION

LT1171HVIQ#TRPBF

PRODUCTION

LT1171HVIT#PBF

PRODUCTION

LT1171IQ#PBF

PRODUCTION

LT1171IQ#TRPBF

PRODUCTION

LT1171IT#PBF

PRODUCTION

Software & Part Ecosystem

Software & Part Ecosystem

Tools & Simulations

Tools & Simulations 1

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.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

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