LT3958
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LT3958

High Input Voltage, Boost, Flyback, SEPIC and Inverting Converter

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Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
Part Models 4
1ku List Price Starting From $3.66
Features
  • Wide Input Voltage Range: 5V to 80V
  • Single Feedback Pin for Positive or Negative Output Voltage
  • Internal 3.3A/84V Power Switch
  • Current Mode Control Provides Excellent Transient Response
  • Programmable Operating Frequency (100kHz to 1MHz) with One External Resistor
  • Synchronizeable to an External Clock
  • Low Shutdown Current < 1μA
  • Internal 7.2V Low Dropout Voltage Regulator
  • Programmable Input Undervoltage Lockout with Hysteresis
  • Programmable Soft-Start
  • Thermally Enhanced QFN (5mm × 6mm) Package
Additional Details
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The LT3958 is a wide input range, current mode, DC/DC converter which is capable of generating either positive or negative output voltages. It can be configured as either a boost, flyback, SEPIC or inverting converter. It features an internal low side N-channel power MOSFET rated for 84V at 3.3A and driven from an internal regulated 7.2V supply. The fixed frequency, current-mode architecture results in stable operation over a wide range of supply and output voltages.

The operating frequency of LT3958 can be set with an external resistor over a 100kHz to 1MHz range, and can be synchronized to an external clock using the SYNC pin. A minimum operating supply voltage of 5V, and a low shutdown quiescent current of less than 1μA, make the LT3958 ideally suited for battery-powered systems.

The LT3958 features soft-start and frequency foldback functions to limit inductor current during start-up.

Applications

  • Automotive
  • Telecom
  • Industrial
Part Models 4
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
LT3958EUHE#PBF
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LT3958EUHE#TRPBF
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LT3958IUHE#PBF
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LT3958IUHE#TRPBF
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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

reference details image

DC1569A

LT3958EUHE Boost Demo Board | 11V-40VIN; VOUT = 48V @ 0.5A

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DC1569A

LT3958EUHE Boost Demo Board | 11V-40VIN; VOUT = 48V @ 0.5A

LT3958EUHE Boost Demo Board | 11V-40VIN; VOUT = 48V @ 0.5A

Product Detail

Demonstration circuit 1569A is a High Voltage Monolithic Boost Converter featuring the LT3958. The LT3958 can be configured as a boost, flyback, SEPIC, and inverting converter, but the demonstration circuit is assembled as a boost. The input voltage range is 11V to 40V and the output voltage is 48V with 500mA over the entire input voltage range. The LT3958 has an internal n-channel 3.3A, 84V power switch for high voltage, power, and efficiency. The dual paddle package provides excellent heat dissipation for the internal power switch. The LT3958 current-mode dc/dc converter features adjustable switching frequency, soft-start, compensation, shutdown and undervoltage lockout with hysteresis, and a feedback pin (FBX) that can be used in both positive and negative applications. A SYNC input can be used to synchronize the switching at a frequency higher than the IC is programmed.



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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