LT3757 Inverting Controller

Analog Devices' LT3757 is a wide input range, current mode, DC / DC controller that is capable of generating either positive or negative output voltages. It can be configured as a boost, flyback, SEPIC or inverting converter. The LT3757 drives a low side external N-channel power MOSFET from an internal regulated 7.2 V supply. The fixed frequency, current-mode architecture results in stable operation over a wide range of supply and output voltages.

The operating frequency of LT3757 can be set with an external resistor over a 100 kHz to 1 MHz range and can be synchronized to an external clock using the SYNC pin. A low minimum operating supply voltage of 2.9 V and a low shutdown quiescent current of less than 1 µA make the LT3757 ideally suited for battery-operated systems.

The LT3757 features soft-start and frequency foldback functions to limit inductor current during start-up and output short-circuit. The device is available in a small 10-lead DFN (3 mm × 3 mm) or MSOP package.