Dual-output synchronous DC/DC controller

3 October 2007 Power Electronics / Power Management

Linear Technology's LTC3850 is a 95% efficient, dual-output synchronous step-down switching regulator controller that drives all N-channel power MOSFET stages with coincident or ratiometric tracking. The 4 V to 24 V input range encompasses a wide variety of applications including most intermediate bus voltages and battery chemistries. The strong on-board driver allows the use of high power external MOSFETs to produce output currents up to 20 A with output voltages ranging from 0,8 to 5,5 V. A constant-frequency current mode architecture allows a selectable fixed or phase-lockable (PLL) frequency from 250 kHz to 780 kHz. Power loss and supply noise are minimised by operating both stages 180° out-of-phase. The LTC3850 features a precision 0,8 V reference with an accuracy of ±1% over a -40°C to 85°C operating temperature range. With up to 97% duty cycle, the LTC3850 has a very low drop-out voltage, a useful feature for extending run times in battery powered applications.

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