Linear low input converter generates +/- regulated voltage


Linear Technology’s LT3959 is a DC-DC converter for boost, SEPIC and inverting power supply applications.

The device operates over an input voltage range of 2.5V to 40V, has an onboard 6A/40V power switch and achieves efficiencies up to 96%. Likely applications are in industrial, automotive, medical and telecoms.

The LT3959 can generate either positive or negative regulated output voltage with its two internal voltage feedback error amplifiers and reference voltages. One set is for positive output voltages and the other is for negative output voltages, both off a single feedback pin.

The operating frequency is programmable fixed or synchronisable of 100kHz to 1MHz.

The LT3959’s current-mode control results in stable operation over a wide range of supply and output voltages. The device supports designs using only ceramic capacitors, enabling a smaller solution size.

Additional features include programmable soft-start, adjustable input undervoltage lockout and a power good pin.

The LT3959 operates from a -40°C to 125°C temperature range and is available in a 5x6mm QFN-36 package.