LT3759 - Wide Input Voltage Range Boost/SEPIC/Inverting Controller

Features

  • Wide VIN Range: 1.6V to 42V
  • Positive or Negative Output Voltage Programming with a Single Feedback Pin
  • PGOOD Output Voltage Status Report
  • Accurate 50mV SENSE Threshold Voltage
  • 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
Designed for Automotive and Transportation Applications
AEC-Q100 data available for specific packages


Typical Application

LT3759 Typical Application
LT3759 Typical Application

Description

The LT®3759 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.

The LT3759 drives a low side external N-channel power MOSFET. An internal LDO regulator draws power from VIN or DRIVE to provide up to a 4.75V supply for the gate driver. The fixed frequency, current-mode architecture results in stable operation over a wide range of supply and output voltages. The operating frequency of LT3759 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 LT3759 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. The device is available in a 12-Lead exposed pad MSOP package.

Packaging

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

Part Number Package Code Temp Package
Drawing
RoHS
LT3759EMSE#PBF MS-12E MSE E 05-08-1666 Yes
LT3759EMSE#TRPBF MS-12E MSE E 05-08-1666 Yes
LT3759HMSE#PBF MS-12E MSE H 05-08-1666 Yes
LT3759HMSE#TRPBF MS-12E MSE H 05-08-1666 Yes
LT3759IMSE#PBF MS-12E MSE I 05-08-1666 Yes
LT3759IMSE#TRPBF MS-12E MSE I 05-08-1666 Yes


LT3759 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
LT3759EMSE#PBF MS-12E E $3.36 $2.35 Yes
LT3759EMSE#TRPBF MS-12E E $2.41 Yes
LT3759HMSE#PBF MS-12E H $4.11 $2.88 Yes
LT3759HMSE#TRPBF MS-12E H $2.94 Yes
LT3759IMSE#PBF MS-12E I $3.62 $2.53 Yes
LT3759IMSE#TRPBF MS-12E I $2.59 Yes
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
DC1725A LT3759EMSE Boost Demo Board | VIN = 1.8V to 4.5V, V OUT = 5V @ 2A $150.00
DC1787A LT3759EMSE SEPIC Demo Board | VIN = 2.8V to 36V, VOUT = 12V @ 1A $150.00
Buy Now
Click here to view our complete list of demo boards

Designed for Automotive and Transportation Applications

AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LT3759HMSE#PBF MS-12E H $4.11 $2.88 Yes
LT3759HMSE#TRPBF MS-12E H $2.94 Yes
LT3759IMSE#PBF MS-12E I $3.62 $2.53 Yes
LT3759IMSE#TRPBF MS-12E I $2.59 Yes
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.

Applications

  • Datacom and Industrial Boost, SEPIC and Inverting Converters
  • Distributed Power Supplies
  • Portable Electronic Equipment
  • Automotive

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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

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Models for the following parts are available in LTspice IV:
LT3759

LTpowerCAD

The LTpowerCAD design tool is a complete power supply design tool program that can significantly ease the tasks of power supply design. It guides users to a solution, selects power stage components, provides detailed power efficiency, shows quick loop bode plot stability and load transient analysis, and can export a final design to LTspice for simulation. Click here to download LTpowerCAD

Design tools for the following parts are available in LTpowerCAD:
LT3759

Technical Support