Linear Technology Offers LT3782 DC-DC Controller

Linear Technology Corp. (LTC, Milpitas, CA) introduced its LT3782, a step-up dc-dc controller with two-phase operation to deliver high output power using only two inductors, eliminating the need for power and current sense transformers. Applications for the LT3782 include automotive, avionics, telecom and base stations where a step-up dc-dc converter must deliver high power with low heat dissipation and occupy a small space.

The LT3782 can regulate a 50 V output at 4 A load current with 96% efficiency from an input source ranging from 10 V to 36 V. The two-phase operation minimizes input and output ripple currents and reduces the value requirements of both the input and output capacitors. With 10 V gate drive and 4 A peak drive current, the LT3782 can drive industrial-grade, high-power MOSFETs at high efficiency.

The LT3782 uses a constant-frequency (150 kHz to 500 kHz) current-mode architecture to improve both line and load regulation, reduce the size of inductors and capacitors, and provide a precision pulse-by-pulse current limit. For synchronous applications, the LT3782 provides synchronous gate signals with programmable falling edge delay to avoid cross conduction when using external MOSFET drivers. The LT3782 operates from a wide input range of 6 V to 40 V; the maximum output voltage is dependent on the choice of external components. Other features include soft-start to reduce inrush current and duty cycle clamp to protect the MOSFETs and improve system reliability.

The LT3782 is offered in a thermally enhanced, 28-lead SSOP, and is rated for operation from -40 °ºC to +125 °C. The 1,000-piece price is $4.70 each.