LT3439 Slew Rate Controlled Ultralow Noise1A Isolated DC/DC Transformer Driver

The LT®3439 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

产品特点 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

参数

应用

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

典型应用图

LT3439 订购信息和价格参考Package Variations and Pricing

器件型号	封装	引脚	温度	价格 (以 1 ~ 99 片为批量)	价格 (以 1000 片为批量) *
LT3439EFE	TSSOP	16	E	$3.29	$2.30
LT3439EFE#PBF	TSSOP	16	E	$3.29	$2.30
LT3439EFE#TR	TSSOP	16	E		$2.42
LT3439EFE#TRPBF	TSSOP	16	E		$2.42

LT3439 数据手册及相关资料下载

数据手册(英文) : LT3439 - Slew Rate Controlled Ultralow Noise 1A Isolated DC/DC Transformer Driver.PDF
设计要点 (英文) : DN316 - Ultralow Noise Switching Power Supplies Simplify EMI Compliance.PDF
应用指南 (英文) : AN118 - High Voltage, Low Noise, DC/DC Converters.PDF
可靠性数据 : R458 Reliability Data .PDF