With just 5µA quiescent current, device delivers 1A outputs

25th July 2014

Staff Reporter

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Datasheet

Delivering dual 1A continuous current to outputs as low as 0.6V, the 17V LTC3622 synchronous buck regulator has been introduced by Linear Technology. The LTC362 device is capable of switching at a fixed 1MHz frequency, whereas the LTC3622-2 device switches at 2.25MHz. Single or dual cell Li-Ion applications, as well as 5V or 12V intermediate bus systems, will benefit from the devices' input voltage range of 2.7V to 17V.

The constant frequency, current-mode architecture minimises switching noise while offering fast line and load transient response. Burst Mode operation requires only 5µA of no load quiescent current, while the synchronous rectification delivers efficiencies as high as 95%. The regulator ensures a highly compact solution footprint thanks to the combination of its 3mm x 4mm DFN package, high switching frequency and tiny, low cost capacitors and inductors.

The LTC3622/-2 features 75ns minimum on-time, enabling the device to step-down 14V inputs to 2.5V, with a 2.25MHz switching frequency without pulse skipping. This feature makes the regulator suited to automotive applications that must keep switching noise above the AM radio band. Applications demanding maximum battery run time will benefit from the device's 5µA quiescent current, while those demanding the lowest possible noise can utilise how the device can be configured to run in pulse-skipping mode or synchronized to an external clock. This reduces noise and potential RF interference. Additional features include a power good voltage monitor for each channel, internal compensation and thermal protection.

Pricing for both package and frequency options starts at $3.75 each in 1,000-piece quantities. Industrial grade versions, the LTC3622IDE and LTC3622IDE-2, are guaranteed to operate over the -40°C to 125°C operating junction temperature range and are priced at $4.19 each in 1,000-piece quantities.