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Buck regulators deliver up to 600mA per channel

Posted: 30 May 2007 ?? ?Print Version ?Bookmark and Share

Keywords:synchronous buck regulator? step-down DC/DC converter? low-voltage DSPs/MCUs?

Linear Technology Corp. released the LTC3419/-1, a dual-output, high-efficiency, 2.25MHz synchronous buck regulator which can deliver up to 600mA of continuous output current from each channel.

Using a constant-frequency current-mode architecture, LTC3419 operates from an input-voltage range of 2.5-5.5V, making it suitable for single-cell Li-ion, multicell alkaline or NiMH applications. It can generate two independent output voltages of 0.6V, enabling it to power the latest generation of low-voltage DSPs and MCUs. A fixed output voltage version, LTC3419-1 is also available with fixed 1.57V and 1.8V outputs. Both versions use a switching frequency of 2.25MHz, which allows for the use of low-cost ceramic capacitors and inductors less than 1mm in height.

LTC3419/-1 uses internal switches with an RDS(ON) of 0.4 to deliver efficiencies as high as 96 percent. It also uses low-dropout, 100 percent duty cycle operation to allow output voltages equal to Vin, further extending battery runtime. No-load quiescent current is 35?A (both channels), and The products are available now. Pricing begins at $1.95 each in 1,000-piece quantities.

- Emily Gleason

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