LT3757
LT3757A
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LT3757
LT3757A

Boost, Flyback, SEPIC and Inverting Controller

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file View Data Sheet (Rev.G)
Documentation View All Documentation
LTspice LT3757 Demo Circuit - Inverting (CUK) Converter (5-15V to -5V @ 5A) Download 4.00KB LTspice LT3757 Demo Circuit - Boost Controller (12V to 24V @ 2A) Download 3.00KB LTspice LT3757 Demo Circuit - SEPIC Controller (5.5-36V to 12V @ 2A) Download 4.00KB LTspice LT3757 - Switching Regulators Download 2.82 KB
Part Models 30
1ku List Price Starting From $2.47
Features
  • Wide Input Voltage Range: 2.9V to 40V
  • Positive or Negative Output Voltage Programming with a Single Feedback Pin
  • Current Mode Control Provides Excellent Transient Response
  • Programmable Operating Frequency (100kHz to 1MHz) with One External Resistor
  • Synchronizable to an External Clock
  • Low Shutdown Current < 1µA
  • Internal 7.2V Low Dropout Voltage Regulator
  • Programmable Input Undervoltage Lockout with Hysteresis
  • Programmable Soft-Start
  • Small 10-Lead DFN (3mm × 3mm) and Thermally Enhanced 10-Pin MSOP Packages
  • AEC-Q100 Qualified for Automotive Applications
Additional Details
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The LT3757/LT3757A are wide input range, current mode, DC/DC controllers which are capable of generating either positive or negative output voltages. They can be configured as either a boost, flyback, SEPIC or inverting converter. The LT3757/LT3757A drive a low side external N-channel power MOSFET 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 LT3757/LT3757A 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 low minimum operating supply voltage of 2.9V, and a low shutdown quiescent current of less than 1µA, make the LT3757/LT3757A ideally suited for battery-operated systems.

The LT3757/LT3757A feature soft-start and frequency foldback functions to limit inductor current during startup and output short-circuit. The LT3757A has improved load transient performance compared to the LT3757.

APPLICATIONS

  • Automotive and Industrial Boost, Flyback, SEPIC and Inverting Converters
  • Telecom Power Supplies
  • Portable Electronic Equipment
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file View Data Sheet (Rev.G)
Documentation View All Documentation
LTspice LT3757 Demo Circuit - Inverting (CUK) Converter (5-15V to -5V @ 5A) Download 4.00KB LTspice LT3757 Demo Circuit - Boost Controller (12V to 24V @ 2A) Download 3.00KB LTspice LT3757 Demo Circuit - SEPIC Controller (5.5-36V to 12V @ 2A) Download 4.00KB LTspice LT3757 - Switching Regulators Download 2.82 KB
Part Models 30
1ku List Price Starting From $2.47
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LT3757
LT3757A

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UPDATED 01/12/2021
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LT3757/LT3757A: Boost, Flyback, SEPIC and Inverting Controller Data Sheet (Rev.G)

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LT3757/LT3757A: Boost, Flyback, SEPIC and Inverting Controller Data Sheet

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LT3757: 昇圧、フライバック、SEPIC および反転コントローラ データシート

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Documentation

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2017-09-18

LT3757 2.9V to 40V Boost, SEPIC, Flyback or Inverting Controller

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ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

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Parts Product Life Cycle Description

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

Evaluation Kit

Evaluation Kits 4

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DC1547B

LT3757AEDD Boost Demo Board | Boost, 3.1V ≤ VIN ≤ 9V; VOUT = 12V at 1.5A

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DC1547B

LT3757AEDD Boost Demo Board | Boost, 3.1V ≤ VIN ≤ 9V; VOUT = 12V at 1.5A

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DC1547B
LT3757AEDD Boost Demo Board | Boost, 3.1V ≤ VIN ≤ 9V; VOUT = 12V at 1.5A
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Demonstration circuit 1547B features the LT3757AEDD in a 400kHz BOOST converter circuit, designed for a 12V output from a 3.1V to 9V input voltage range.


The LT3757A operates over an input range of 2.9V to 40V, suitable for applications from single-cell lithium-ion battery portable electronics up to high voltage automotive and industrial power supplies. It also exhibits low shutdown quiescent current of 1μA, making them an ideal fit for battery-operated systems. Thanks to a novel FBX pin architecture, the LT3757A can be connected directly to a divider from either the positive output or the negative output to ground. The LT3757A has improved load transient performance compared to the LT3757.

Resources

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DC1547B - Schematic Download

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DC1547B - Demo Manual Download

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DC1547B - Design Files Download

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DC1548A

LT3757EDD Inverting (CUK) Demo Board | 7V-28VIN; VOUT = −15V at 1A

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DC1548A

LT3757EDD Inverting (CUK) Demo Board | 7V-28VIN; VOUT = −15V at 1A

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DC1548A
LT3757EDD Inverting (CUK) Demo Board | 7V-28VIN; VOUT = −15V at 1A
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Demonstration circuit 1548A features the LT3757EDD in a 300kHz CUK converter circuit, designed for −15V output from a 7V to 28V input. The LT3757EDD operates over an input range of 2.9V to 40V, suitable for applications from single-cell lithium-ion battery portable electronics up to high voltage automotive and industrial power supplies. It also exhibits low shutdown quiescent current of 1μA, making them an ideal fit for battery-operated systems. Thanks to a novel FBX pin architecture, the LT3757EDD can be connected directly to a divider from either the positive output or the negative output to ground. It also packs many popular features such as soft-start, input undervoltage lockout, adjustable frequency and synchronization in a small 10-lead MSOP package or a 3mm × 3mm QFN package.

Resources

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DC1548A - Design Files Download

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DC1548A - Demo Manual Download

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DC1548 - Schematic Download

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DC1341B

LT3757EDD SEPIC Demo Board | 4.5V ≤ VIN ≤ 36V; VOUT = 5V @ 3A

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DC1341A

LT3757EDD SEPIC Demo Board | 4.5V-36Vin; Vout = 5V @ 3A

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DC1341A

LT3757EDD SEPIC Demo Board | 4.5V-36Vin; Vout = 5V @ 3A

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DC1341A
LT3757EDD SEPIC Demo Board | 4.5V-36Vin; Vout = 5V @ 3A
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Demonstration circuit 1341A features LT3757EDD in a 300kHz SEPIC converter circuit, designed for 5V output from a 4.5V to 36V input.


The LT3757EDD operates over an input range of 2.9V to 40V, suitable for applications from single-cell lithium- ion battery portable electronics up to high voltage automotive and industrial power supplies. It also exhibits low shutdown quiescent current of 1µA, making them an ideal fit for battery-operated systems. The IC integrates a high voltage, low dropout linear (LDO) regulator. Thanks to a novel FBX pin architecture, the LT3757EDD can be connected directly to a divider from either the positive output or the negative output to ground. They also pack many popular features such as soft-start, input undervoltage lockout, adjustable frequency and synchronization in a small 10-lead MSOP package or a 3mm × 3mm QFN package.

Resources

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DC1341A - Design File Download

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DC1341A - Demo Manual Download

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DC1341A - Schematic Download

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Evaluation Kits4

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DC1547B

LT3757AEDD Boost Demo Board | Boost, 3.1V ≤ VIN ≤ 9V; VOUT = 12V at 1.5A
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DC1548A

LT3757EDD Inverting (CUK) Demo Board | 7V-28VIN; VOUT = −15V at 1A
evaluation kit item images

DC1341B

LT3757EDD SEPIC Demo Board | 4.5V ≤ VIN ≤ 36V; VOUT = 5V @ 3A
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DC1341A

LT3757EDD SEPIC Demo Board | 4.5V-36Vin; Vout = 5V @ 3A
Tools & Simulations

Tools & Simulations 2

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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LT3757 Demo Circuit - Inverting (CUK) Converter (5-15V to -5V @ 5A) Download

4.00K

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LT3757 Demo Circuit - Boost Controller (12V to 24V @ 2A) Download

3.00K

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LT3757 Demo Circuit - SEPIC Controller (5.5-36V to 12V @ 2A) Download

4.00K

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LT3757 - Switching Regulators Download

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