Linear Technology's LTC3119 is a high-efficiency, 18 V, monolithic buck-boost converter that can deliver up to 5 A of continuous output current. Extensive feature integration and very-low-resistance internal power switches minimize the total solution footprint for even the most demanding applications. A proprietary, four-switch PWM architecture provides seamless, low-noise operation from input voltages above, equal to, or below the output voltage.

External frequency programming, as well as synchronization, using an internal PLL enable operation over a wide switching frequency range of 400 kHz to 2 MHz. The wide 2.5 V to 18 V input range is well suited for operation from unregulated power sources, including battery stacks and backup capacitors. After start-up, operation is possible with input voltages as low as 250 mV.

Other features include output short-circuit protection, thermal-overload protection, less than 3 µA shutdown current, a power-good indicator, Burst Mode® operation, and maximum power point control.

The LTC3119 is offered in thermally enhanced, 28-lead, 4 mm × 5 mm, QFN and TSSOP packages.