DC/DC converter for inverting power supply apps

Linear Technology has announced the LT3957, a DC/DC converter for boost, flyback, SEPIC and inverting power supply applications.

This device operates over an input voltage range of 3 to 40V, has an onboard 5A/40V power switch and achieves efficiencies up to 96 per cent, making it suited for industrial, automotive, medical and telecom applications.

The LT3957 can generate either a 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.

With a programmable fixed or synchronisable operating frequency from 100kHz to 1MHz, designers can choose a range of inductors and capacitors to optimise size, performance and cost.

Its current-mode control results in stable operation over a 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 output overvoltage and overcurrent protection.

The LT3957 operates from a -40 to 125C temperature range and is offered in a 5 x 6mm QFN-36 package with additional pin spacing to support high-voltage operation.

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