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Linear Technology has announced the LTC3619 synchronous buck regulator, which operates from an input voltage range of 2.5V to 5.5V, making it suitable for single-cell Li-ion and USB applications.

The LTC3619 is a dual-output, high-efficiency, 2.25MHz, synchronous buck regulator with programmable average input current limit.

It can deliver up to 800mA of continuous output current from one channel and 400mA from the other with efficiencies as high as 96 per cent.

The LTC3619 uses a constant frequency and current mode architecture.

It can generate two independent output voltages as low as 0.6V, enabling it to power the latest generation of low-voltage DSPs and microcontrollers.

The LTC3619 uses a switching frequency of 2.25MHz, which allows for the utilisation of tiny, low-cost ceramic capacitors and inductors less than 1mm in height.

The combination of dual architecture, tiny externals and a 3mm x 3mm DFN (or thermally enhanced MSOP-10) package make the LTC3619 a highly compact synchronous step-down solution for dual-output voltage rails.

The LTC3619 offers a programmable average input current limit that can be programmed between 200mA and 1.2A, with +/-5 per cent accuracy via a single resistor.

The 400mA channel remains in regulation even when the input current limit is reached.

This makes the LTC3619 suitable for USB applications, supercapacitor charging and point-of-load power supplies.

Combined with a supercapacitor, the LTC3619 enables its 800mA output to deliver high peak load current without collapsing the input supply or the 400mA output for applications such as GSM amplifiers.

It also utilises low dropout 100 per cent duty cycle operation to allow output voltages equal to VIN, further extending battery runtime.

The LTC3619 uses Burst Mode operation to reduce no load quiescent current to only 50uA (both channels) and less than 1uA in shutdown, providing optimal battery life.

The LTC3619B uses a pulse skipping mode to minimise switching interference in applications that require the lowest possible noise.

Other features include independent soft start and power good indicator for each channel, short-circuit protection and internal compensation.

The LTC3619 is also suitable for hand-held applications requiring input current limiting, dual outputs of up to 400mA and 800mA, high efficiency and a very small solution footprint.

The LTC3619EDD and LTC3619BEDD are both available from stock in a 3mm x 3mm DFN-10.

The LTC3619EMSE and LTC3619BEMSE are both available from stock in a thermally enhanced MSOP-10 package.

Industrial-grade versions -LTC3619IDD, LTC3619BIDD (in DFN-10 packages) LTC3619IMSE and LTC3619BIMSE (in MSOP-10E packages) – are tested and guaranteed to operate over a -40C to 125C operating junction temperature range.

Linear Technology

Analog Devices (NASDAQ: ADI) is the leading global high-performance analog technology company dedicated to solving the toughest engineering challenges.

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