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DC/DC controller generates positive or negative regulated voltages

October 04, 2011 | Christoph Hammerschmidt | 222901821
DC/DC controller generates positive or negative regulated voltages Linear Technology Corporation announces the LT3759, a wide input range DC/DC controller for boost, SEPIC and inverting power supply applications, capable of generating either positive or negative regulated output voltages. The LT3759 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 LT3759 a highly versatile DC/DC controller for many types of power supply designs.

The LT3759 operates over a wide input voltage range from 1.6V to 42V and is suited for industrial, automotive, medical and telecom applications, the vendor says. 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, and 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 undervoltage lockout with hysteresis, and a power good signal along with output overvoltage and overcurrent protection.

The LT3759 is available in thermally enhanced MSOP-12 package with extended and industrial operating junction temperature ranges from -40°C to 125°C. The H-grade version operates over a -40°C to 150°C junction temperature range. For more information, visit


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