LT3439

PRODUCTION

Slew Rate Controlled Ultralow Noise 1A Isolated DC/DC Transformer Driver

Data Sheet (Rev. B) Product Selection Table

Part Models: 2
1ku List Price: Starting From $4.69

Viewing:

Overview

Reduced Conducted and Radiated EMI
Single Resistor Control of Output Switch Voltage and Current Slew Rates
Cross Conduction Prevention Circuitry
Two 1A Current Limited Power Switches
Low Minimum Supply Voltage: 2.8V

Low Shutdown Current: <20µA
50% Duty Cycle
20kHz to 250kHz Oscillator Frequency
Synchronizable to 300kHz
Overcurrent and Overtemperature Protected

The LT3439 is a push-pull DC/DC transformer driver that reduces conducted and radiated electromagnetic interference (EMI). Ultralow noise and EMI are achieved by controlling the output switch voltage and current slew rates. Slew rates are user adjustable to optimize output noise versus efficiency. The LT3439 can reduce high frequency harmonic content by as much as 40dB with only a minor decrease in efficiency.

The LT3439 includes two 1A current limited power switches to ensure start-up under heavy loads. It also includes an oscillator that can be synchronized to an external clock for more accurate placement of switcher harmonics. Protection features include current limiting, undervoltage lockout, thermal shutdown and cross conduction prevention circuitry.

The LT3439 is available in a thermally enhanced 16-pin TSSOP with an exposed backside.

Applications

Low Noise Isolated Supplies
Radio and Telecom Supplies
Distributed Supplies
Medical Instruments
Precision Instruments
Low Noise Filament Supplies

Part Models: 2
1ku List Price: Starting From $4.69

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
LT3439EFE#PBF	16-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3439EFE#TRPBF	16-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Apr 6, 2022 - 22_0068 Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL
		PCN22_0068_Form Material_Report Delta Qualification Matrix
LT3439EFE#PBF	PRODUCTION
LT3439EFE#TRPBF	PRODUCTION

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
Oscillators 2
LTC6908		Resistor Set SOT-23 Oscillator with Spread Spectrum Modulation
LTC6909	PRODUCTION	1 to 8 Output, Multiphase Silicon Oscillator with Spread Spectrum Modulation
Switching Regulators & Controllers 1
LT3999	PRODUCTION	Low Noise, 1A, 1MHz Push-Pull DC/DC Driver with Duty Cycle Control

Tools & Simulations

LTspice 1

LT3439 Demo Circuit - Low Noise Push-Pull DC/DC Transformer (5V to 5V @ 500mA)

Models for the following parts are available in LTspice:

LT3439

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.