LT1071 - 5A and 2.5A High Efficiency Switching Regulators

Features

  • Wide Input Voltage Range: 3V to 60V
  • Low Quiescent Current: 6mA
  • Internal 5A Switch (2.5A for LT1071)
  • Very Few External Parts Required
  • Self-Protected Against Overloads
  • Operates in Nearly All Switching Topologies
  • Shutdown Mode Draws Only 50µA Supply Current
  • Flyback Regulated Mode has Fully Floating Outputs
  • Comes in Standard 5-Pin TO-220 Packages
  • Can be Externally Synchronized (Consult Factory)

Typical Application

LT1071 Typical Application
LT1071 Typical Application

Description

The LT1070/LT1071 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 LT1070/LT1071 to be built in a standard 5-pin T0-220 power package. This makes it extremely easy to use and provides “bust proof” operation similar to that obtained with 3-pin linear regulators.

TheLT1070/LT1071 operate with supply voltages from 3Vto 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.

TheLT1070/LT1071 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 current swith nol oss in efficiency. An externally activated shutdown modereduces total supply current to 50µA typical for standby operation. Totally isolated and regulated outputs can begeneratedby using the optional “flyback regulation mode” built into the LT1070/LT1071, without the need for optocouplers or extra transformer windings.

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
LT1071CT#06PBF TO-220 T C 05-08-1421 (Standard) Yes
LT1071CT#30PBF TO-220 T C 05-08-1421 (Standard) Yes
LT1071CT#PBF TO-220 T C 05-08-1421 (Standard) Yes
LT1071HVCT#PBF TO-220 T C 05-08-1421 (Standard) Yes
LT1071HVIT#PBF TO-220 T I 05-08-1421 (Standard) Yes
LT1071IT#PBF TO-220 T I 05-08-1421 (Standard) Yes


LT1071 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
LT1071CT#06PBF TO-220 C $5.75 $4.60 Yes
LT1071CT#30PBF TO-220 C $6.20 $5.05 Yes
LT1071CT#PBF TO-220 C $5.75 $4.60 Yes
LT1071HVCT#PBF TO-220 C $7.50 $6.00 Yes
LT1071HVIT#PBF TO-220 I $9.75 $7.90 Yes
LT1071IT#PBF TO-220 I $7.50 $6.10 Yes
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* 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

Applications

  • Logic Supply 5V at 10A
  • 5V Logic to ± 15V Op Amp Supply
  • Offline Converter up to 200W
  • Battery Upconverter
  • Power Inverter (+ to -) or (- to +)
  • Fully Floating Multiple Outputs
  • For Lower Current Applications, See the LT1072

Product Notifications

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Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

To launch a ready to run LTspice demonstration circuit for this part:

  • Step 1: If you have not installed LTspice on this computer, download and install LTspice
  • Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
  • Step 3: If LTspice does not automatically open after clicking the link above, 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

To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.

Models for the following parts are available in LTspice:
LT1071
LT1071HV

Technical Support