Step-down controller

  • 23-Feb-2012 04:12 EST

Linear Technology’s synchronous step-down controller provides true current mode control with submilliohm direct current resistance (DCR) sensing. The LTC3866 current mode dc/dc controller allows the use of a very low DCR power inductor using a DCR sensing architecture that enhances the signal-to-noise ratio of the current sense signal. A power inductor DCR of as low as 0.17 milliohms can be used to maximize converter efficiency and increase power density. This sensing technique dramatically reduces the switching jitter normally associated with low DCR applications. DCR temperature compensation maintains a constant and accurate current limit threshold over a broad temperature range. The LTC3866 operates from an input voltage of 4.5 to 38 V, which encompasses a range of applications, including most intermediate bus voltages and battery voltages.

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