Linear Unveils LTC3546 Dual-Channel Regulator Linear Technology has introduced a dual-channel synchronous buck regulator that can deliver either dual 2A outputs or 3A from one channel and 1A from the other, with up to 96 per cent efficiency. Using a constant-frequency, current-mode architecture, the LTC3546 operates from an input-voltage range of 2.25V to 5V, making it suitable for single-cell Li-ion/polymer or multi-cell alkaline/NiCad/NiMH applications. Each output is adjustable from 0.6V to 5V and has turn-on supply tracking. Separate Run and Power Good PINs enable independent control of each channel. The LTC3546's switching frequency can be set at 2.25MHz or is programmable from 750kHz to 4MHz, enabling the designer to optimise efficiency while avoiding critical noise-sensitive frequency bands. The combination of its 4mm x 5mm QFN-28 package and its high switching frequency keeps external inductors and capacitors small, providing a compact, thermally efficient footprint. ...
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