DESCRIPTION

· The LT1738 is a switching regulator controller designed to minimize conducted and radiated electromagnetic interference (EMI).

· It controls the voltage and current slew rates of an external N-channel MOSFET switch to achieve ultralow noise and EMI.

· The device can reduce high-frequency harmonic power by up to 40dB with minimal efficiency loss.

· It features a current mode architecture optimized for single switch topologies like boost, flyback, and Cuk.

· The IC includes gate drive, oscillator, control, and protection circuitry, and can regulate both positive and negative voltages.

· The internal oscillator can be synchronized to an external clock for precise harmonic placement.

FEATURES

· Greatly reduced conducted and radiated EMI.

· Low switching harmonic content.

· Independent control of output switch voltage and current slew rates.

· Reduced need for external filters.

· Single N-channel MOSFET driver.

· Oscillator frequency range from 20kHz to 250kHz.

· Easily synchronized to an external clock.

· Capable of regulating both positive and negative voltages.

· Simplified layout compared to conventional switchers.

APPLICATIONS

· Power supplies for noise-sensitive communication equipment.

· EMI-compliant offline power supplies.

· Precision instrumentation systems.

· Isolated supplies for industrial automation.

· Medical instruments.

· Data acquisition systems.