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Step-down DC/DC converter with internal 1.4A power switch

Posted: 15 Mar 2006 ?? ?Print Version ?Bookmark and Share

Keywords:Linear Technology? LT3493? PWM step-down DC/DC converter?

Linear Technology Corp. announced the LT3493, a current mode PWM step-down DC/DC converter with an internal 1.4A power switch, packaged in a tiny 6-pin 2-by-3mm DFN.

According to the press release, its wide input range of 3.6V to 36V and capability of withstanding 40V transients make the LT3493 suitable for regulating power from a wide variety of sources, including unregulated wall transformers, 24V industrial supplies and automotive batteries. For automotive applications, it can easily operate with sub-4V inputs which is essential for automotive "cold crank" requirements. Meanwhile, its 750kHz operating frequency allows the use of tiny, low cost inductors and ceramic capacitors, resulting in low, predictable output ripple.

The LT3493's low VCESAT (330mV at 1A) internal switch offers efficiencies as high as 89 percent and the device can generate outputs as low as 0.78V, the company said. Internal cycle-by-cycle current limit provides protection against shorted outputs while soft-start eliminates input current surge during start up. The low current (<2?A) shutdown provides easy power management in battery-powered systems.

The LT3493EDCB is available from stock in a thermally enhanced 2-by-3mm DFN-6 package. A higher temperature grade "I" version, the LT3493IDCB, is also available from stock. Pricing starts at $2.65 each and $3.18 each, respectively, for 1,000-piece quantities.

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Related Datasheets
Part Number Description Category
? LT3493 1.2A, 750kHz Step-Down Switching Regulator in 2mm × 3mm DFN ICs, Interface



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