Power Management Switching Regulator Inverting Regulators
Power Management Switching Regulator Step-Down (Buck) Regulators Internal Power Switch Buck
 Power Management Switching Regulator Step-Down (Buck) Regulators High Input Voltage Buck

LT4363 - High Voltage Surge Stopper with Current Limit

LTC2974 - 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement

LT1074 - Step-Down Switching Regulator

Features

  • 5A Onboard Switch (LT1074)
  • Operates Up to 60V Input
  • 100kHz Switching Frequency
  • Greatly Improved Dynamic Behavior
  • Available in Low Cost 5 and 7-Lead Packages
  • Only 8.5mA Quiescent Current
  • Programmable Current Limit
  • Micropower Shutdown Mode

Typical Application

LT1074 Typical Application
LT1074 Typical Application

Description

The LT1074 is a 5A (LT1076 is rated at 2A) monolithic bipolar switching regulator which requires only a few external parts for normal operation. The power switch, all oscillator and control circuitry, and all current limit components,are included on the chip. The topology is a classic positive “buck” configuration but several design innovations allow this device to be used as a positive-to-negative converter, a negative boost converter, and as a flyback converter. The switch output is specified to swing 40V below ground, allowing the LT1074 to drive a tapped-inductor in the buck mode with output currents up to 10A.

The LT1074 uses a true analog multiplier in the feedback loop. This makes the device respond nearly instantaneously to input voltage fluctuations and makes loop gain independent of input voltage. As a result, dynamic behavior of the regulator is significantly improved over previous designs.

On-chip pulse by pulse current limiting makes the LT1074 nearly bust-proof for output overloads or shorts. The input voltage range as a buck converter is 8V to 60V, but a self-boot feature allows input voltages as low as 5V in the inverting and boost configurations.

The LT1074 is available in lowcost TO-220 or DD packages with frequency pre-set at 100kHz and current limit at 6.5A (LT1076 =2.6A). A 7-pin TO-220 package is also available which allows current limit to be adjusted down to zero. In addition, full micropower shutdown can be programmed. See Application Note 44 for design details.

A fixed 5V output, 2A version is also available. See LT1076-5.

Packaging

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

DD-5, DD-7, T5, T7

LT1074 Package Drawing
LT1074 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LT1074CT TO-220 5 C $6.17 $5.05 View
LT1074CT#06PBF TO-220 5 C $6.17 $5.05 View
LT1074CT#30PBF TO-220 5 C $6.62 $5.50 View
LT1074CT#PBF TO-220 5 C $6.17 $5.05 View
LT1074CT7 TO-220 7 C $7.17 $5.90 View
LT1074CT7#06PBF TO-220 7 C $7.17 $5.90 View
LT1074CT7#PBF TO-220 7 C $7.17 $5.90 View
LT1074HVCT TO-220 5 C $9.25 $7.60 View
LT1074HVCT#06PBF TO-220 5 C $9.25 $7.60 View
LT1074HVCT#PBF TO-220 5 C $9.25 $7.60 View
LT1074HVCT7 TO-220 7 C $10.25 $8.40 View
LT1074HVCT7#06PBF TO-220 7 C $10.25 $8.40 View
LT1074HVCT7#PBF TO-220 7 C $10.25 $8.40 View
LT1074HVIT TO-220 5 I $12.50 $10.25 View
LT1074HVIT#06PBF TO-220 5 I $12.50 $10.25 View
LT1074HVIT#30PBF TO-220 5 I $12.95 $10.70 View
LT1074HVIT#PBF TO-220 5 I $12.50 $10.25 View
LT1074HVIT7 TO-220 7 I $13.50 $10.80 View
LT1074HVIT7#35PBF TO-220 7 I $13.95 $11.25 View
LT1074HVIT7#PBF TO-220 7 I $13.50 $10.80 View
LT1074IT TO-220 5 I $8.33 $6.85 View
LT1074IT#06PBF TO-220 5 I $8.33 $6.85 View
LT1074IT#PBF TO-220 5 I $8.33 $6.85 View
LT1074IT7 TO-220 7 I $9.15 $7.35 View
LT1074IT7#PBF TO-220 7 I $9.15 $7.35 View
Buy Now • Request 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

Applications

  • Buck Converter with Output Voltage Range of 2.5V to 50V
  • Tapped-Inductor Buck Converter with 10A Output at 5V
  • Positive-to-Negative Converter
  • Negative Boost Converter
  • Multiple Output Buck Converter

People Who Viewed This Product Also Viewed

Product Notifications

Please login to your MyLinear account for notifications of datasheet updates, new document releases and LTspice model announcements for your favorite products. If you do not have a MyLinear account you may Sign Up Now.

Forgot your password? Click here.
Need help? Email mylinear@linear.com with questions and comments.

Simulate

LTspice IV is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. To download LTspice IV and other FREE simulation tools, please visit our Design Simulation page.

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 IV
  • Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
  • Step 3: If LTspice IV 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.

Related models available in LTspice IV
LT1074
LT1074HV

Technical Support