LT3959 - Wide Input Voltage Range Boost/SEPIC/Inverting Converter with 6A, 40V Switch

Features

  • Wide VIN Range: 1.6V (2.5V Start-Up) to 40V
  • Positive or Negative Output Voltage Programming with a Single Feedback Pin
  • PGOOD Output Voltage Status Report
  • Internal 6A/40V Power Switch
  • Programmable Soft-Start
  • Programmable Operating Frequency (100kHz to 1MHz) with One External Resistor
  • Synchronizable to an External Clock
  • Low Shutdown Current < 1μA
  • INTVCC Regulator Supplied from VIN or DRIVE
  • Programmable Input Undervoltage Lockout with Hysteresis
  • Thermally Enhanced QFN (5mm × 6mm) and TSSOP Packages

Typical Application

LT3959 Typical Application
LT3959 Typical Application

Description

The LT®3959 is a wide input range, current mode, DC/DC controller which is capable of regulating either positive or negative output voltages from a single feedback pin. It can be configured as a boost, SEPIC or inverting converter.

It features an internal low side N-channel MOSFET rated for 6A at 40V and driven from an internal regulated supply provided from VIN or DRIVE. The fixed frequency, current-mode architecture results in stable operation over a wide range of supply and output voltages. The operating frequency of LT3959 can be set over a 100kHz to 1MHz range with an external resistor, or can be synchronized to an external clock using the SYNC pin.

The LT3959 features soft-start and frequency foldback functions to limit inductor current during start-up and output short-circuit. A window comparator on the FBX pin reports via the PGOOD pin, providing output voltage status indication.

Packaging

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

QFN-36, TSSOP-38

LT3959 Package Drawing
LT3959 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LT3959EFE#PBF TSSOP 38 E $4.63 $3.24 View
LT3959EFE#TRPBF TSSOP 38 E $3.30 View
LT3959EUHE#PBF QFN 36 E $4.36 $3.05 View
LT3959EUHE#TRPBF QFN 36 E $3.11 View
LT3959IFE#PBF TSSOP 38 I $5.27 $3.69 View
LT3959IFE#TRPBF TSSOP 38 I $3.75 View
LT3959IUHE#PBF QFN 36 I $5.03 $3.52 View
LT3959IUHE#TRPBF QFN 38 I $3.58 View
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.

Part Number Description Price Documentation
DC1853A LT3959EUHE Boost Demo Board | 2V-10Vin; Vout = 12V @ 2A. Contact Factory
Buy Now
Click here to view our complete list of demo boards

Applications

  • Automotive
  • Telecom
  • Industrial

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.

Design Tools

LTspiceIV

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. Click here to download LTspice IV

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.

Models for the following parts are available in LTspice IV:
LT3959

Technical Support