Power

Buck-boost controller features wide input & output voltages

27th November 2014
Barney Scott

Delivering up to 250W of power with a single IC, the LT3790 from Linear Technology is a synchronous buck-boost DC/DC controller. A 4.7-60V input voltage range makes it suitable for a wide variety of automotive and industrial applications, whilst output voltage can be set from 0 to 60V, making the controller suitable as a voltage regulator or battery/supercapacitor charger.

The LT3790's internal four-switch buck-boost controller operates from input voltages above, below or equal to the output voltage, making it suitable for automotive applications where the input voltage can vary dramatically during stop/start, cold crank and load dump scenarios. Transitions between buck, pass-through and boost operating modes are seamless, offering a well regulated output in spite of wide variations of supply voltage. The LT3790's unique design utilises three control loops to monitor input current, output current and output voltage to deliver optimal performance and reliability.

Delivering up to 250W of continuous output power with efficiencies up to 98.5%, the LT3790 uses four external switching MOSFETs. Output current accuracy of ±6% ensures precise current regulation while ±2% output voltage accuracy offers a precise output voltage, making the controller suitable for charging applications. Multiple LT3790s can be easily paralleled for higher power requirements, and switching frequency can be programmed between 200 and 700kHz or synchronised to an external clock. Additional features include output disconnect, input and output current monitors, a C/10 charge termination and integrated fault protection.

The LT3790EFE is available in a 38-lead thermally enhanced TSSOP package, priced from $4.75 each in 1,000 unit quantities. An extended temperature version, or I-grade LT3790IFE, is also available, priced from $5.25 each in 1,000 unit quantities. A high temperature version, or H-grade, the LT3790HFE, is also available, priced from $5.50 each in 1,000 unite quantities. Finally, an extended temperature version, or MP-grade, the LT3790MPFE, is also available, priced from $14.75 each in 1,000 unit quantities. All versions are available from stock.

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