Lt3758, a high input voltage DC / DC controller introduced by linear Technology Corporation, is used for boost, flyback, SEPIC and negative output power applications, and can generate positive or negative stable output voltage. The lt3758 has two voltage feedback error amplifiers and a reference voltage. One group is used for positive output voltage and the other for negative output voltage. Both are powered by a single feedback pin, making the lt3758 a highly versatile DC / DC controller suitable for many types of power supply designs.

Performance characteristics and application analysis of high input voltage DC / DC controller lt3758

The lt3758 has a wide operating input voltage range of 5.5V to 100V, which is ideal for applications subject to high input voltage transients. This device can achieve up to 96% efficiency and is very suitable for harsh industrial, automotive, medical and telecommunications applications. With programmable fixed or synchronous operating frequencies from 100kHz to 1MHz, designers can choose a wide range of inductors and capacitors to optimize size, performance and cost. The fixed frequency and current mode control realize stable operation in a wide range of power supply and output voltage. Coupled with the all ceramic capacitor design, it creates a solution with smaller overall size.

The lt3758 drives an external n-channel MOSFET from an internally stable 7.2V power supply. The programmable soft start realizes the control of the on time of the output voltage. In addition, the lt3758 has programmable input undervoltage lockout with hysteresis and output overvoltage and overcurrent protection.

The lt3758 is packaged in heat-resistant enhanced msop-10 and 3mm x 3mm DFN-10. Both packages have versions that can work in the extended temperature range of – 40oC to 125oC and industrial temperature range. Purchase in batches of 1000 pieces at a price of US $2.35 per piece.

Performance summary: lt3758

• for boost, flyback, SEPIC and negative output applications

• wide input operating voltage: 5.5V to 100V

• set the positive or negative output voltage with a single feedback pin

• a fixed operating frequency of 100kHz to 1MHz can be selected

• can be synchronized to external clock

• programmable soft start

• integrated low-end drives

• true current mode control

• internal 7.2V low dropout regulator

• low shutdown current: 1uA

• output overvoltage and overcurrent protection

• programmable input undervoltage lockout with hysteresis

Responsible editor: GT

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