Efficient convertor has low-resistance switches

High-efficiency 2.25MHz synchronous buck convertor delivers up to 800mA of continuous output current from a ThinSOT package.

Linear Technology has announced the LTC3560, a high efficiency, 2.25MHz, synchronous buck regulator that delivers up to 800mA of continuous output current from a ThinSOT package.

Using a constant frequency and current mode architecture, the LTC3560 operates from an input voltage range of 2.5 to 5.5V, making it ideal for single cell Li-ion, or multiple-cell alkaline/NiCad/NiMH applications.

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

Its 2.25MHz switching frequency enables the use of tiny, low cost ceramic capacitors and inductors less than 1mm in height, providing a very compact solution footprint for handheld applications.

The LTC3560 uses internal switches with an on-resistance of only 0.21ohm (N-channel) and 0.23ohm (P-channel) to deliver efficiencies as high as 95%.

It also uses low dropout 100% duty cycle operation to allow output voltages equal to the input, further extending battery run-time.

The LTC3560 uses low ripple (below 20mV peak-peak) Burst Mode operation to offer only 16uA no load quiescent current.

If the application is noise sensitive the Burst Mode function can be disabled, using a lower noise pulse-skipping mode which still offers only 200uA of quiescent current.

In either mode, it maintains a shutdown current of less than 1uA, further maximising battery run time.

The LTC3560 can also be synchronised to an external clock.

Other features include +/-2% output voltage accuracy and overtemperature protection.

The LTC3560ES6 is available from stock in a 6-lead ThinSOT package.

Pricing starts at US $1.90 each in 1000-piece quantities.

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