LT3439 - Slew Rate Controlled Ultralow Noise 1A Isolated DC/DC Transformer Driver
- 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.
PackagingFor complete and up to date package information and drawings, please refer to our packaging page
- Part numbers ending in PBF are lead free. Please contact LTC marketing for information on lead based finish parts.
- 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||Pins||Temp||Price (1-99)||Price (1k)*||RoHS Data|
|Buy Now • Request Samples|
Demo BoardsLinear 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.
|DC511A||LT3439EFE | Low Noise Isolated Power Supply, Vin = +5V +/-5%, +Vout = +12V@80mA, -Vout = -12V@80mA.||$125.00|
- Low Noise Isolated Supplies
- Radio and Telecom Supplies
- Distributed Supplies
- Medical Instruments
- Precision Instruments
- Low Noise Filament Supplies
People Who Viewed This Product Also Viewed
- LT3748 - 100V Isolated Flyback Controller
- LT8300 - 100VIN Micropower Isolated Flyback Converter with 150V/260mA Switch
- LT1533 - Ultralow Noise 1A Switching Regulator
- LT3080 - Adjustable 1.1A Single Resistor Low Dropout Regulator
- LT4320/LT4320-1 - Ideal Diode Bridge Controller
- LT3573 - Isolated Flyback Converter without an Opto-Coupler
- LT4363 - High Voltage Surge Stopper with Current Limit
- LT1761 - 100mA, Low Noise, LDO Micropower Regulators in TSOT-23
- LT3757 - Boost, Flyback, SEPIC and Inverting Controller
- LT3798 - Isolated No Opto-Coupler Flyback Controller with Active PFC
Please login to your MyLinear account for notifications of datasheet updates, new document releases and LTspice model announcements for your favorite products. If you do not have a MyLinear account you may Sign Up Now.
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
To launch a ready to run LTspice demonstration circuit for this part:
- Step 1: If you have not installed LTspice on this computer, download and install LTspice IV
- Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
- Step 3: If LTspice IV does not automatically open after clicking the link above, 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
To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.
Models for the following parts are available in LTspice IV: