Low VIN capable 5-A DC/DC converter generates positive or negative regulated voltage

August 01, 2012 // By Paul Buckley
Linear Technology Corporation has unveiled a versatile DC/DC converter for boost, SEPIC and inverting power supply applications.

The LT3959 operates over an input voltage range of 2.5 V to 40 V, has an onboard 6 A/40 V power switch and achieves efficiencies up to 96%, making it well suited for industrial, automotive, medical and telecom applications.

The device 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. With a programmable fixed or synchronizable operating frequency from 100kHz to 1MHz, designers can choose a wide range of inductors and capacitors to optimize size, performance and cost.

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 to 125°C temperature range and is available in a 5 mm x 6 mm QFN-36 package. The 1000-piece price starts at $3.05 each.

More information about the LT3959 DC/DC converter at www.linear.com/product/LT3959