LT3758 Generates Positive And Negative Voltages

Linear Technology has brought out the LT3758, a high-input voltage DC/DC controller for boost, flyback, Sepic and inverting power-supply applications. It is capable of generating either positive or negative regulated output voltages. The LT3758 has two voltage feedback error amplifiers and reference voltages.

One set is for positive-output voltages, the other is for negative output voltages, both off a single feedback pin, making the LT3758 a versatile DC/DC controller for many types of power-supply designs. The LT3758 operates from a wide input voltage range from 5.5 to 100V, which is ideal for surviving high-input voltage transients. This device can achieve efficiencies up to 96 per cent and is suited for harsh industrial, automotive, medical and telecom applications.

With a programmable fixed or synchronisable operating frequency from 100kHz to 1MHz, designers can choose a wide range of inductors and capacitors to optimise size, performance and cost. The fixed frequency, current-mode control results in stable operation over a wide range of supply and output voltages, along with all ceramic capacitor designs, enabling a smaller solution size. The LT3758 drives an external N-channel MOSFET from an internally regulated 7.2V supply.

Programmable soft-start enables control of the output voltage turn-on time. In addition, the LT3758 features a programmable input undervoltage lockout with hysteresis, along with output overvoltage and overcurrent protection. The LT3758 is offered in thermally enhanced MSOP-10 and 3 x 3mm DFN-10 packages, both with extended and industrial temperature ranges from -40C to +125C. The 1000-piece price starts at USD2.35 (GBP1.45) each.

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