Step-down regulator med ultralav hvilestrøm
Linear Technology lancerer 17V, synkron step-down regulator med dobbelte 1A outputs, og som opererer med en hvilestrøm på kun 5µA (in english).
The LTC3622 is a high efficiency, 17V input capable synchronous buck regulator from Linear Technology that delivers dual 1A continuous current to outputs as low as 0.6V. Synchronous rectification delivers efficiencies as high as 95%, while Burst Mode operation requires only 5µA of no load quiescent current.The LTC3622 switches at a fixed 1MHz frequency, whereas the LTC3622-2 switches at 2.25MHz. Their constant frequency, current-mode architecture minimizes switching noise while offering very fast line and load transient response. The LTC3622/-2 operates from an input voltage range of 2.7V to 17V, making it ideal for single or dual cell Li-Ion applications as well as 5V or 12V intermediate bus systems. The combination of its 3mm x 4mm DFN package, high switching frequency and tiny, low cost capacitors and inductors ensures a highly compact solution footprint.
The LTC3622/-2’s 75ns minimum on-time enables it to step-down 14V inputs to 2.5V with a 2.25MHz switching frequency without pulse skipping, making it ideal for automotive applications that must keep switching noise above the AM radio band. Its 5µA quiescent current makes it well suited for always-on applications demanding maximum battery run time.
For applications that require the lowest possible noise, the LTC3622/-2 can be configured to run in pulse-skipping mode or synchronized to an external clock, reducing noise and potential RF interference. Additional features include a power good voltage monitor for each channel, internal compensation and thermal protection.
The LTC3622EDE and LTC3622EDE-2 are available in a 3mm x 4mm DFN-14 package. http://www.linear.com/product/LTC3622
