Application Notes

AN-1149 Auxiliary Smartphone Battery Power Management Circuit

Silego Technology explains how a small, flexible chip can be configured just like an ASIC, but allows designers to design and program prototypes in a matter of minutes vs. the weeks needed for true ASICs.

One of the biggest improvements that can be made to the smartphone user experience is longer battery life. While users may browse on their phones for hours on end, size-limited, internal, non-removable batteries often come up short. Balancing long battery life with size, however, is a tricky problem to solve. As the battery industry struggles to provide higher energy density battery chemistries and technologies, many smartphone users have turned to portable chargers to support their highly active usage habits. This, in turn, creates a great opportunity for low cost, high-efficiency portable chargers.

Portable chargers are relatively simple devices which comprise a few main components; most commonly Lithium Polymer (LiPo) batteries, a charging circuit, a power distribution switch, a power management IC (PMIC), and a DC-DC boost converter. There are PMIC solutions on the market today which can address these different functions, however many are expensive, power-hungry, and contain many more components and features than are needed for this simple application, leading to a less than ideal solution. Another option is to develop a custom ASIC, however this is only practical in very high volume and often at an exorbitant price, volume commitment, and risk of price hikes in the future. Enter Silego Technology’s GreenPAK, a Configurable Mixed-signal IC (CMIC) with one-time programmable non-volatile memory (NVM). This incredibly small, flexible chip can be configured just like an ASIC, but allows designers to design and program prototypes in a matter of minutes vs. the weeks needed for true ASICs. It doesn’t require a minimum volume commitment or NRE, either. Using Silego’s GreenPAK SLG46620V, it is possible to implement a full featured, low-power, universal portable charger control circuit in just 2.0 x 3.0 mm.

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Tags

Auxiliary, Smartphone, Battery Power, Management, Circuit, LiPo Charger, Constant Current, CC, Constant Voltage, CV


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