LT3439EFE#PBF

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. It can reduce high frequency harmonic content by as much as 40dB with only a minor decrease in efficiency. This device 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. It is widely used in application such as low noise isolated supplies, radio and telecom supplies, distributed supplies, medical instruments, precision instruments, low noise filament supplies etc.

• Reduced conducted and radiated EMI
• Single resistor control of output switch voltage and current slew rates
• Cross conduction prevention circuitry
• Operating voltage range is 2.8V to 17.5V
• Supply current is 12mA typical
• Supply current in shutdown mode is 5µA typical at (2.8V ≤ VIN ≤ 17.5V, VSHDN = 0V)
• 50% typical duty cycle, synchronization frequency range is 300KHz maximum
• Oscillator frequency is 250KHz maximum
• Operating junction temperature is -40°C to 125°C
• Package style is 16-lead plastic TSSOP

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party