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Synchronous buck regulator with 4MHz switching frequency

Posted: 02 Dec 2005 ?? ?Print Version ?Bookmark and Share

Keywords:Linear Technology? buck regulator? LTC3417?

Linear Technology Corp. unveiled a dual output, high efficiency, 4MHz, synchronous buck regulator that delivers up to 1.4A of continuous output current from one channel and up to 800mA from the second.

Using a constant frequency and current mode architecture, the LTC3417 operates from an input voltage range of 2.25V to 5.5V, making it a suitable solution for single cell Li-ion, multi-cell alkaline or NiMH applications. This device can generate two independent output voltages as low as 0.6V, enabling it to power the latest generation of low voltage DSPs and microcontrollers. Meanwhile, its switching frequency of up to 4MHz allows the utilization of tiny, low cost ceramic capacitors and inductors less than 2mm in height.

The LTC3417 uses internal switches with an RDS(ON) of only 0.088 ohm and 0.160 ohm to deliver efficiencies as high as 95 percent. It also utilizes low dropout 100 percent duty cycle operation to allow output voltages equal to VIN, further extending battery run-time. With Burst Mode operation enabled, no load quiescent current is 1255A (both channels), and 51uA in shutdown ensuring optimal battery life. If the application is noise sensitive, explained Linear Tech, the user can disable Burst Mode, replacing it with a lower noise pulse-skipping mode. A phase mode pin enables the second channel to operate in-phase or 180 degrees out-of-phase with respect to channel 1. Out-of-phase operation produces lower RMS current at VIN, thus lower RMS derating on the input capacitor. Other features include a power good output, internal soft-start and short-circuit protection.

The LTC3417EDHC is available from stock in a DFN-16 package, while the LTC3417EFE is offered in a thermally enhanced TSSOP package. Pricing for the LTC3417EDHC starts at $3.35, and $3.55 for the LTC3417EFE, both in 1,000-piece quantities.

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Related Datasheets
Part Number Description Category
? LTC3417 Dual Synchronous 1.4A/800mA 4MHz Step-Down DC/DC Regulator ICs, Interface



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