LT3959
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LT3959

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

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Part Details
Part Models 8
1ku List Price Starting From $3.66
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
Additional Details
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The LT3959 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.

Applications

  • Automotive
  • Telecom
  • Industrial
Part Models 8
1ku List Price Starting From $3.66

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LT3959EFE#PBF
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LT3959EFE#TRPBF
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LT3959EUHE#PBF
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LT3959EUHE#TRPBF
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LT3959IFE#PBF
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LT3959IFE#TRPBF
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LT3959IUHE#PBF
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Product Lifecycle

PCN

Apr 6, 2022

- 22_0068

Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL

LT3959EFE#PBF

PRODUCTION

LT3959EFE#TRPBF

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LT3959IFE#PBF

PRODUCTION

LT3959IFE#TRPBF

PRODUCTION

Filter by Model

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Part Models

Product Lifecycle

PCN

Apr 6, 2022

- 22_0068

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Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL

LT3959EFE#PBF

PRODUCTION

LT3959EFE#TRPBF

PRODUCTION

LT3959IFE#PBF

PRODUCTION

LT3959IFE#TRPBF

PRODUCTION

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

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DC1853A

LT3959EUHE Boost Demo Board | 2V-10VIN; VOUT = 12V @ 2A

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DC1853A

LT3959EUHE Boost Demo Board | 2V-10VIN; VOUT = 12V @ 2A

LT3959EUHE Boost Demo Board | 2V-10VIN; VOUT = 12V @ 2A

Product Detail

The LT3959 is a current mode DC/DC converter with an integrated 6A, 40V switch. It can operate over an input range of 1.6V to 40V, suitable for applications from singlecell lithium-ion battery portable electronics up to high voltage automotive and industrial power supplies. It also exhibits low shutdown quiescent current of <1μA, making it an ideal fit for battery-operated systems. Thanks to a novel FBX pin architecture, the LT3959 can be connected directly to a divider from either positive or negative output to ground. It also packs many popular features such as soft-start, input undervoltage lockout, adjustable frequency and synchronization. Demonstration circuit 1853A features LT3959 in a 300kHz boost converter, designed for 12V output from 2V to 10V input (VIN).


 


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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