Buck regulator has programmable current limit

Linear Technology has announced the LTC3606B, a 2.25MHz synchronous buck regulator with programmable average input current limit.

It can deliver up to 800mA of continuous output current with efficiencies as high as 96 per cent.

Using a constant frequency and current mode architecture, the LTC3606B operates from an input voltage range of 2.5V to 5.5V, making it suitable for single-cell Li-ion and USB applications.

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

The LTC3606B uses a switching frequency of 2.25MHz, allowing the use of tiny, low-cost ceramic capacitors and inductors less than 1mm in height.

The combination of high switching frequency, tiny externals and a 3mm x 3mm DFN package make the LTC3606B a compact synchronous step-down solution.

The LTC3606B offers a programmable average input current limit that can be set between 200mA and 800mA, with +/-5 per cent accuracy via a single resistor.

This makes the LTC3606B suitable for USB applications, supercapacitor charging and point-of-load power supplies.

Combined with a supercapacitor, the LTC3606B is able to output high peak load currents of up to 2A without collapsing the input supply 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 run time.

The LTC3606B uses a pulse-skipping mode to optimise light load efficiency while minimising switching interference in applications that require the lowest possible noise.

Other features include independent soft start and power good indication, short-circuit protection and internal compensation.

The LTC3606B can be used in hand-held applications, which require input current limiting, outputs of up to 800mA, high efficiency and a very small solution footprint.

The LTC3606EDD is available from stock in a 3mm x 3mm DFN-8.

An industrial-grade version, the LTC3606BIDD, is tested and guaranteed to operate over a -40C to 125C operating junction temperature range.

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