Versatile 5-A DC/DC converter generates either a positive or a negative regulated voltage
June 15, 2010 // Paul Buckley
Linear Technology Corporation has unveiled a versatile DC/DC converter for boost, flyback, SEPIC and inverting power supply applications.
The LT3957 operates over an input voltage range of 3 V to 40 V, has an onboard 5 A/40 V power switch and achieves efficiencies up to 96 percent, making it well 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 synchronizable operating frequency from 100 kHz to 1 MHz, designers can choose a wide range of inductors and capacitors to optimize size, performance and cost. Its 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, as well as output overvoltage and overcurrent protection.
The LT3957 operates from a -40 to 125 degrees C temperature range and is offered in a 5 mm x 6 mm QFN-36 package with additional pin spacing to support high voltage operation. The 1000-piece price starts at 2.95 US Dollars each.
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