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Linear Tech dc-dc converter operates between 2.5V and 24V

Posted: 24 Nov 2004 ?? ?Print Version ?Bookmark and Share

Keywords:linear technology? dc-dc converter? lt3479?

Linear Technology Corp. has developed a current mode, fixed frequency step-up dc-dc converter with an internal 3A, 42V switch.

The new LT3479 operates from an input voltage range of 2.5V to 24V, making it suitable for applications with input sources ranging from a single cell Li-ion to a 20V wall adapter. Both inputs of the error amplifier are available to the user, permitting use as a boost converter or an inverter. In addition, its 42V switch enables outputs as large as 40V. It can also drive two high current white LEDs (in series) with current as high as 700mA from a single Li-ion cell. Its switching frequency can be programmed, via a single resistor, between 300kHz and 3.5MHz, enabling the designer to minimize external component sizes and avoid "noise critical" frequency bands in the system. A tiny/low profile inductor and ceramic capacitors keep solution footprints very compact while minimizing solution cost, added the company.

The LT3479's low VCESAT switch, 0.3V at 2.5A, delivers efficiencies of up to 89 percent. The device features a programmable soft-start function to limit inductor current during start-up as well as inrush current protection to protect the LT3479 during shorts and line transients.

According to Linear Tech, the low profile (0.75mm) 14-pin, 4-by-3mm DFN-14 package provides excellent thermal performance in a small footprint. The LT3479 is also available in a thermally enhanced 16-pin TSSOP package.

Both the LT3479EDE (4-by-3mm DFN-14) and the LT3479EPE (TSSOP-16E) versions are available from stock. Pricing for both packaging options starts at $3 each for 1,000-piece orders.

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