Linear LTC3118 DC-DC converter

Linear Technology’s LTC3118 is a dual-input, wide voltage range, synchronous buck-boost DC-DC converter with an intelligent, integrated, low-loss PowerPath control. The power switch architecture provides efficient operation from either input source to a programmable output voltage above, below or equal to the input. Voltage capability of up to 18 V provides flexibility and voltage margin for a wide variety of applications and power sources.

The product uses a low-noise, current-mode architecture with a fixed 1.2 MHz PWM mode frequency that minimises footprint. For high efficiency at light loads, automatic Burst Mode operation consumes only 50 μA of quiescent current in sleep.

System level features include diode or VIN priority modes, VIN and VOUT power indicators, accurate RUN comparators to program independent UVLO thresholds and output disconnect in shutdown. Other features include 2 μA shutdown current, short-circuit protection, soft-start, current limit and thermal overload protection.

The converter is offered in thermally enhanced 24-lead 4 x 5 mm QFN and 28-lead TSSOP packages. Applications include systems with multiple input sources; backup power systems; battery or super capacitor input for reserve power; and replacing diode-or designs with higher efficiency, flexibility and performance.