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.
CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.
For complete and up to date package information and drawings, please refer to our packaging page
- Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
- 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
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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
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