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New dc-dc controller suits avionics, telecom power systems

Posted: 14 Apr 2005 ?? ?Print Version ?Bookmark and Share

Keywords:linear technology? dc-dc controller? lt3724?

Linear Technology Corp. introduced a 125C-rated wide input and output voltage range versatile dc-dc controller that designed for use in step-down, step-up, inverting or SEPIC circuits with up to 100W of output power.

A power supply incorporating the LT3724 can convert 4V to 60V input supplies to a regulated output ranging from 1.23V to 36V, said the press release. Current mode operation provides several benefits including stable operation over a wide range of voltages and load currents, accurate short-circuit protection, and fast line and load transient response. To simplify output noise filtering, reduce the size of inductor and capacitors, and improve efficiency, the LT3724 operates at a constant 200kHz switching frequency.

Linear Tech added that the LT3724 is a single-chip solution for multiple power supply topologies in applications such as industrial, 12V and 42V automotive and heavy equipment, avionics and telecom power systems.

The LT3724 has an on-board gate driver capable of driving large N-channel MOSFETs. The controller includes Burst Mode operation, which reduces quiescent current below 100?A maintaining high efficiency at light loads. The operating efficiency at full load is slightly less than 95 percent. Moreover, an internal high voltage bias regulator allows for simple biasing and can be back driven to increase efficiency. Additional features of the LT3724 are precision undervoltage lockout, 10?A shutdown current and programmable soft-start to minimize overshoot at startup.

The LT3724 is offered in a thermally enhanced 16-pin TSSOP and is rated for operation from -40C to 125C. In 1,000-piece orders, pricing begins at $3.10 each.

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