Buck Regulator For Single-Cell Li-ion Applications

Linear Technology has launched the LTC3612 high-efficiency, 4MHz synchronous buck regulator said to be ideal for single-cell Li-ion applications as well as intermediate bus systems. The LTC3612 incorporates a constant frequency, current mode architecture. It can deliver up to 3A of continuous output current at output voltages as low as 0.6V from a 3 x 4mm QFN or a thermally enhanced TSSOP-20 package. The LTC3612 operates from an input voltage of 2.25V to 5.5V, making it ideal for single-cell Li-ion applications as well as 3.3V or 5V intermediate bus systems.

Its switching frequency is user-programmable from 300kHz to 4MHz, enabling the use of tiny, low-cost capacitors and inductors. The LTC3612 uses internal switches with RDS(ON) of only 45mohms and 70mohms to deliver efficiencies of more than 90 per cent for high step-down ratio applications, such as 5VIN to 1.8VOUT conversions. Burst-mode operation is used to maximise light load efficiency, requiring only 70uA at no load, making it well suited for applications demanding maximum battery run time. An adjustable burst-mode clamp enables designers to further optimise light load efficiency. For applications that require the lowest possible noise, the LTC3612 can be configured to run in either pulse-skipping or forced continuous modes, reducing noise and potential RF interference. The LTC3612 also offers inputs for tracking capability as well as a DDR memory mode, which can source/sink +/- 1.5A.

Additional features include optional active voltage positioning, a power good voltage monitor, external synchronisation capability and thermal protection. The LTC3612EUDC is available in a 3 x 4mm QFN-20, and the LTC3612EFE is offered in a 20-lead, thermally enhanced TSSOP package. Industrial grade versions - the LTC3612IUDC and LTC3612IFE - are guaranteed to meet specifications over the -40C to 125C operating junction temperature range.

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