Image

Slave Step-Down Phase Extender Generates Up To 300 A

Jan. 15, 2014
The LTC3874 dual-phase synchronous step-down slave controller generates currents up to 200 A when paired with a companion master controller by extending the phase count in multiphase applications.

The LTC3874 dual-phase synchronous step-down slave controller generates currents up to 200 A when paired with a companion master controller by extending the phase count in multiphase applications. Compatible master controllers include the LTC3866, LTC3875, and LTC3774—all have current-mode control and enable the use of low (0.2 mΩ) dc-resistance (DCR) power inductors without any sense resistor to maximize converter efficiency and boost power density. Developed by Linear Technology, the LTC3874 includes accurate phase-to-phase current sharing, which is critical in multiphase slave designs. Up to 12 phases can be paralleled and clocked out-of-phase to minimize filtering. Input voltage ranges from 4.5 to 38 V; fixed output voltage ranges up to 5.5 V. The device has a fixed operating frequency from 250 kHz to 1 MHz; it also can be synchronized to an external clock. Onboard gate drivers (1.1 Ω) help diminish MOSFET switching losses. Current-sense threshold limits from 16 to 72 mV minimize power loss and accurately set the overcurrent trip point. Packaging is a 28-lead, 4- by 5-mm QFN. Applications include power distribution, redundant (n+1) supplies, industrial systems, digital signal processing, and ASIC power.

LINEAR TECHNOLOGY CORP.

About the Author

Staff

Articles, galleries, and recent work by members of Electronic Design's editorial staff.

Sponsored Recommendations

Comments

To join the conversation, and become an exclusive member of Electronic Design, create an account today!