LT1738EG#PBF

LINEAR TECHNOLOGY  LT1738EG#PBF  直流/直流控制器, 超低噪, 2.55V至20V, 1路输出, 升压, Cuk, 反激, 250kHz, SSOP-20

The is a Switching Regulator Controller designed to lower conducted and radiated electromagnetic interference EMI. Ultralow noise and EMI are achieved by controlling the voltage and current slew rates of an external N-channel MOSFET switch. Current and voltage slew rates can be independently set to optimize harmonic content of the switching waveforms vs efficiency. The LT1738 can reduce high frequency harmonic power by as much as 40dB with only minor losses in efficiency. It utilizes a current-mode architecture optimized for single switch topologies such as boost, flyback and Cuk. The IC includes gate drive and all necessary oscillator, control and protection circuitry. Unique error amp circuitry can regulate both positive and negative voltages. The internal oscillator may be synchronized to an external clock for more accurate placement of switching harmonics.

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Greatly reduced conducted and radiated EMI

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Low switching harmonic content

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Independent control of output switch voltage and current slew rates

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Greatly reduced need for external filters

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Single N-channel MOSFET driver

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Easily synchronized to external clock

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Regulates positive and negative voltages

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Easier layout than with conventional switchers