The LTC3703's strong onboard 1-Ω gate drivers minimize switching transient losses associated with driving MOSFETs at high frequency. To optimize the size-cost ratio of inductors, MOSFETs and capacitors, the switching frequency is resistor-adjustable from 100 kHz to 600 kHz. The total solution cost of a LTC3703 power supply design is less than dc-dc bricks with comparable power levels. Applications include conversion of 36-V to 72-V backplane power to 12-V or 5-V intermediate supplies in telecom and servers, as well as power supplies in automotive and industrial systems susceptible to 90-V surges.

The LTC3703 drives N-channel MOSFETs synchronously to achieve high efficiency. Its 0.8-V reference voltage is±1% accurate. The adjustable soft-start guarantees safe start-up by eliminating overshoots. The LTC3703's high bandwidth (25-MHz) error amplifier and patented loop compensation provide very fast line and load transient responses that are superior to flyback topologies and existing high voltage dc-dc regulators. Moreover, current limit is user programmable with an external resistor.

For more information, visit www.linear.com.

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