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 the 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 550kHz frequency current mode architecture and can also be locked to a 260kHz to 550kHz clock to reduce EMI at sensitive frequencies.

The LTC3828 is used to convert 4.5V to 28V (30VMAX) input voltage to two regulated output voltages, adjustable from 0.8V 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 180º out of phase. A clock output pin enables synchronization of multiple controllers. The IC allows the user to program how the channel outputs ramp up and down. Both coincident and ratiometric tracking are supported. The LTC3828 is rated for operation from -40ºC to 85ºC and is offered in 28-lead SSOP and 5mm x 5mm QFN packages. 1,000-piece pricing starts at $4.65 each.