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Buck regulator delivers up to 250mA from 1.6V input

Posted: 18 Aug 2006 ?? ?Print Version ?Bookmark and Share

Keywords:Linear? buck regulator? LTC3549?

Linear Technology Corp. has announced the LTC3549, a 2.25MHz synchronous buck regulator that promises up to 250mA of continuous output current from input voltages as low as 1.6V. Using a constant frequency and current mode architecture, the LTC3549 operates from an input voltage range of 1.6-5.5V, making it suitable for single cell Li-ion or dual-cell alkaline/NiCad/NiMH applications, explained Linear Tech.

The new device can generate output voltages as low as 0.61V, said the company, enabling it to power the latest generation of low-voltage DSPs and microcontrollers. Its 2.25MHz switching frequency enables the utilization of tiny, low-cost ceramic capacitors and inductors less than 1mm in height, providing a highly compact solution footprint for handheld applications.

The regulator uses internal switches with an Rrds(on) of only 0.4 - (N-Channel) and 0.56 (P-Channel) to deliver efficiencies of up to 93 percent. It also utilizes low dropout 100 percent duty cycle operation to allow output voltages equal to VIN, further extending battery run-time. The device utilizes low ripple Burst Mode operation to provide 50?A no load quiescent current with less than 20mVPK-PK of output ripple.

Linear's LTC3549 buck regulator

If the application is noise sensitive, the device can be set in an even lower noise pulse-skipping mode, yet still offers only 300?A of quiescent current. Both parts maintain shutdown current of less than 1?A, further maximizing battery life. The device is stable with ceramic capacitors, the company said, achieving low output voltage ripple. Other features include current mode operation for efficient line and load transient response, internal soft-start and over-temperature protection.

The LTC3549EDCB is available from stock in 6-lead 2-by-3mm DFN Packages. Pricing starts at $1.35 each 1,000-piece quantities.

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Related Datasheets
Part Number Description Category
? LTC3549 250mA Low VIN Buck Regulator in 2mm x 3mm DFN ICs, Interface



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