LT3439
PRODUCTIONSlew Rate Controlled Ultralow Noise 1A Isolated DC/DC Transformer Driver
- Part Models
- 2
- 1ku List Price
- Starting From $5.93
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
Documentation
Data Sheet 1
User Guide 1
Application Note 1
Design Note 1
Technical Articles 1
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 | ||
| LT3439EFE#TRPBF | 16-Lead TSSOP w/ EP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
May 18, 2026 - 26_0072 Epoxy Change for Select TSSOP Products |
||
| LT3439EFE#PBF | PRODUCTION | |
| LT3439EFE#TRPBF | PRODUCTION | |
|
Apr 6, 2022 - 22_0068 Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL |
||
| LT3439EFE#PBF | PRODUCTION | |
| LT3439EFE#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Can't find the software or driver you need?
Request a Driver/SoftwareHardware 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
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.
Evaluation Kits
LT3439EFE | Low Noise Isolated Power Supply, VIN = 5V ±5%, VOUT = 12V @ 80mA, –VOUT = –12V @ 80mA