Fixed frequency DC-DC converter

Linear Technology has announced the LT3462/A, a 40V, 300mA inverting DC-DC converter with onboard Schottky diode packaged in a ThinSOT.

The LT3462 switches at a constant 1.2MHz, while the “A” version switches at 2.7MHz. Both devices operate from an input voltage of 2.5V to 16V and can deliver output voltages up to -38V.

An input voltage range of 2.5V to 16V makes the LTC3462/A ideal for single cell Li-Ion, or multi-cell NiMH or alkaline applications, as well as other fixed rail systems. It can be negatively biased for CCD and LCD applications as well as general-purpose negative voltage supplies. It can deliver up to 100mA at -5V from a 5V input.

The LT3462/A operates in a dual inductor inverting topology that filters both the input side and output side currents. Low output voltage ripple – better then 1mV pk-to-pk – can be achieved with ceramic capacitors. Fixed frequency switching improves the output quality, said the firm, and reducing low frequency noise. The 40V switch allows V_IN to V_OUT differentials of up to 38V for dual inductor topologies.