Linear Offers LTC3569 Synchronous Buck Regulator

Linear Technology's LTC3569 is a triple-channel, high efficiency 3MHz synchronous buck regulator. It delivers 1.2A of continuous output current from one channel and 600mA from each of the other two channels. Using a constant frequency current-mode architecture, the LTC3569 operates from an input voltage range of 2.5 to 5.5V, making it ideal for single-cell Li-Ion/polymer or multicell alkaline/NiCad/NiMH applications.

Each of the three output-voltages are independently programmable by lowering the feedback voltage of each channel from 800 to 425mV (in 25mV increments) by toggling the EN pin, enabling dynamic adjustment of each channel's output voltage. Additionally, each of the 600mA regulators can act as slave power stages to each other or to the 1.2A channel to support higher currents, providing additional design flexibility.

The LTC3569's switching frequency can be programmed between 1 and 3MHz or set at 2.25MHz, enabling the designer to optimise efficiency while avoiding critical noise-sensitive frequency bands. The combination of its 3 x 3mm QFN-20 (or TSSOP- 16E) package and high switching-frequency keeps external inductors and capacitors small, providing a compact and thermally efficient footprint.

The LTC3569's internal synchronous switches offer efficiencies as high as 95 per cent, while burst mode operation minimises quiescent current to 100uA (all three channels) in no-load conditions. For applications demanding the lowest possible noise, the LTC3569 can run in a pulse skipping mode to minimise output ripple.

The LTC3569 offers a power-good indicator and is synchronisable to an external clock (1.2 to 3MHz). Other features include internal compensation, over-temperature and short-circuit protection. The LTC3569EUD is available in a 3 x 3mm QFN-20 package and the LTC3569EFE is offered in a 16-lead thermally enhanced TSSOP package. Industrial grade versions, the LTC3569IUD and LTC3569IFE, are tested and guaranteed to operate to the -40C to +85C operating junction temperature.

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