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Step-Down Controller

Thu, 06/30/2005 - 8:30am

Linear Technology introduces the LTC3828, a dual step-down synchronous switching controller with integrated tracking for sequencing multiple voltage rails, phase-locked loop (PLL) for precision synchronization and PolyPhase® operation for reducing input capacitance. The LTC3828 has a unique capability to daisy chain to multiple LTC3828s or other DC/DC converters to provide tracking for more than two voltages while operating at 3, 4 or 6 phases. The IC has a constant 550 kHz frequency current mode architecture and can also be locked to a 260 kHz to 550 kHz clock to reduce EMI at sensitive frequencies. The LTC3828 is used to convert 4.5 V to 28 V (30 VMAX) input voltage to two regulated output voltages, adjustable from 0.8 V to as high as 99% of the value of the input voltage. The LTC3828 uses a constant frequency, current mode all N-channel MOSFET synchronous architecture with the two control channels operating 180° out of phase. A clock output pin enables synchronization of multiple controllers.


Linear Technology Corporation


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