Slave current-mode step-down phase extender offers 300-A with sub-milliohm DCR sensing
The LTC3874 complements Linear Technology’s low DCR peak current mode controllers and provides all functions needed for multiphase slave designs, including accurate phase-to-phase current sharing even for dynamic loads. It operates over an input voltage range of 4.5 V to 38 V and produces a fixed output voltage up to 5.5 V. Up to 12 phases can be paralleled and clocked out-of-phase to minimize filtering. Applications include power distribution, redundant (n+1) supplies, industrial systems, DSP and ASIC power.
Compatible master controllers include the LTC3866, LTC3875 and LTC3774, which all have true current-mode control and enable the use of low (0.2 milliohms) DC resistance (DCR) power inductors without any sense resistor to maximize converter efficiency and increase power density.
The LTC3874 has a fixed operating frequency from 250 kHz to 1 MHz or it can be synchronized to an external clock. The powerful 1.1 Ohm onboard gate drivers minimize MOSFET switching losses. Precise programmable current sense threshold limits from 16mV to 72 mV minimize power loss and accurately set the over-current trip point. Additional features include selectable continuous or discontinuous light load operation, programmable phase shift control and overvoltage protection.
Availability and Pricing
The LTC3874 is available in a 28-lead 4mm x 5mm QFN package. The 1,000-piece price starts at $2.47 each.
More information about the LTC3874 dual phase synchronous step-down slave controller at www.linear.com/product/LTC3874
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