Switching regulator controller produces 20A output currents
The LTC3853, a triple output synchronous step-down switching regulator controller, has been released by Linear Technology. Operating over a 4.5-24V input voltage range, the controller can produce output currents up to 20A per phase with output voltages of 0.8-13.5V. These H- and MP-grade versions, which have an efficiency up to 95%, are guaranteed over operating junction temperatures from -40 to +150°C and -55 to +150°C.
Featuring a constant-frequency current mode architecture, the LTC3853 allows a selectable fixed or synchronised frequency from 250-750kHz. The controller operates the three stages 120° out-of-phase, minimising power loss and supply noise. By measuring the voltage drop across the output inductor (DCR) or using an optional sense resistor, output current sensing is accomplished. Heat dissipation from 1.1Ω on-chip MOSFET gate drivers, which are featured within the controller, is limited by current foldback. Selectable Burst Mode operation, pulse skipping or continuous inductor current modes are user controlled to optimise light load efficiency.
With up to 98% duty cycle, the LTC3853 has a low dropout voltage, making it suitable for extending run times in battery-powered applications. Available in a thermally enhanced 6x6mm QFN-40 package, the controller is priced at $4.24.
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