LT3439 - Slew Rate Controlled Ultralow Noise 1A Isolated DC/DC Transformer Driver

Features

  • 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

Typical Application

LT3439 Typical Application
LT3439 Typical Application

Description

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.

Packaging

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

TSSOP-16

LT3439 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LT3439EFE TSSOP 16 E $5.00 $3.50 View
LT3439EFE#PBF TSSOP 16 E $5.00 $3.50 View
LT3439EFE#TR TSSOP 16 E $3.62 View
LT3439EFE#TRPBF TSSOP 16 E $3.62 View
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* 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
DC511A LT3439EFE | Low Noise Isolated Power Supply, Vin = +5V +/-5%, +Vout = +12V@80mA, -Vout = -12V@80mA. $125.00
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Click here to view our complete list of demo boards

Applications

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

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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:
LT3439

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