Power supply controller operates at 1.6-42V input voltage

Linear Technology Corp. has announced its new product that can produce negative and positive output voltages—the LT3759. The design has two sets of voltage feedback error amplifiers and reference voltages. Each set is used for the positive and negative output voltages. Through these sets, the LT3759 can easily control other class of DC/DC power supply designs.

The LT3759 operates over an input voltage range of 1.6V to 42V, and is suited for industrial, automotive, medical and telecom applications. With a programmable and synchronizable operating frequency from 100kHz to 1MHz, designers can choose a wide range of inductors and capacitors to optimize size, performance and cost. The fixed frequency, current-mode control architecture results in stable operation over a wide range of supply and output voltages. The use of all ceramic capacitors enables a smaller solution size. The LT3759 drives an external N-channel MOSFET from an internally regulated 4.75V supply. Additional features include programmable soft-start, an accurate 50mV current sense threshold, programmable under voltage lockout with hysteresis, and a power signal along with output overvoltage and over current protection.

The LT3759 is available in a thermally-enhanced MSOP-12 package with extended and industrial operating junction temperature ranges of -40°C to 125°C. The H-grade version operates over a -40°C to 150°C junction temperature range. The 1000-piece price starts at $2.35 each.

Other features of the LT3759 are as follows: suitable for SEPIC and inverting applications, positive or negative output voltage setting with a single feedback pin, synchronizable to an external clock, and true current-mode control.