Summary: The integrated circuit that the article introduced to have access of switch power source to manage devises the problem that face and complete solution.

Keyword: Linear; Power source management; PMIC

Setting

USB technology raised the portable sex of electronic product, need larger batteries size to be more function power supply at the same time. It is with individual media player exemple, as the volatile growth that can download media content, people wants to convey the data in PC portable hold facility, USB makes this kind of deferent rate rapidder. Charge to equipment with same USB port very convenient also. Nevertheless, when the batteries that gives device with USB port charges, there are a few restrictions on power. Power source access (PowerPath) develop attacks integrated circuit solved these problems, brought all sorts of profit for final user, can advocate peace to input power source, batteries without what seam the ground to manage all sorts of differring oneself for example, and charge quickly for the laden power supply, quantity of heat with lowest and implementation " put through immediately " the job. Approach force Er is special the LTC3555 that the company offers is integrated circuit of a kind of power source management (PMIC) , piece on the power source access that is based on switch mode manages implement, 3 charger of lithium ion batteries, step-down manostat, and LDO. This parts of an apparatus has a lot of high-powered functions, be beneficial to end item, compressed QFN encloses its miniature and few exterior component can be comprised for hand-held electron product simple, compact the solution with economy.

Main design difficult problem

Below a lot of circumstances, can charge to offer bigger convenience for the user to batteries with USB port. But, USB standard has certain restriction to USB electric current. A batteries charger that is based on USB must as far as possible efficient the ground from USB port draw-out as far as possible much power, in order to satisfy today's power source concentrated model the strict restriction that uses in space and respect of quantity of heat.

Power source route running inside the product is another problem. For example, can use port of communication adapter, car adapter, USB or lithium ion by the portable electron product of batteries power supply more very much today / polymer batteries power supply. Nevertheless, managed the power source access between these power source, load and batteries to bring tremendous skill to challenge independently. On the tradition, stylist people try to use amplifier of a few MOSFET, operation and other schism component to realize this one function all the time, but be faced with heat to insert all the time unplug, the huge issue such as big surge electric current, these problems may pose serious systematic dependability problem. Till recently, although the integrated circuit solution of schism also needs a few chip,will achieve a practical solution.
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