LT3957

PRODUCTION

Boost, Flyback, SEPIC and Inverting Converter with 5A, 40V Switch

Part Models: 4
1ku List Price: Starting From $3.54

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Overview

Wide Input Voltage Range: 3V to 40V
Single Feedback Pin for Positive or Negative Output Voltage
Internal 5A/40V Power Switch
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 5.2V Low Dropout Voltage Regulator
Programmable Input Undervoltage Lockout with Hysteresis
Programmable Soft-Start
Thermally Enhanced QFN (5mm × 6mm) Package

The LT3957 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 40V at 5A and driven from an internal regulated 5.2V supply. The fixed frequency, current-mode architecture results in stable operation over a wide range of supply and output voltages.

The operating frequency of LT3957 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 3V, and a low shutdown quiescent current of less than 1μA, make the LT3957 ideally suited for battery-powered systems.

The LT3957 features soft-start and frequency foldback functions to limit inductor current during start-up.


	Features
LT3957	-
LT3957A	Improved Load Transient Performance

Applications

Automotive
Telecom
Industrial

Part Models: 4
1ku List Price: Starting From $3.54

Documentation

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.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LT3957EUHE#PBF	36-Lead QFN (5mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3957EUHE#TRPBF	36-Lead QFN (5mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3957IUHE#PBF	36-Lead QFN (5mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3957IUHE#TRPBF	36-Lead QFN (5mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
LT3957A	PRODUCTION	Boost, Flyback, SEPIC and Inverting Converter with 5A, 40V Switch

Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

LT3957
LT3957A

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.

Evaluation Kits

LT3957EUHE Demo Board | Boost, 4.5V ≤ VIN ≤ 20V, VOUT = 24V at 0.6A

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Product Details

Demonstration circuit 1544 is a Boost, SEPIC, Flyback and Inverting Converter with 5A, 40V Switch featuring the LT3957. The LT3957 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 4.5V to 20V and the output voltage is 24V with 600mA over the entire input voltage range.

Resources

DC1544A - Demo Manual
8/25/2010

DC1544A - Schematic
8/25/2010

DC1544A - Design Files
8/25/2010

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