The latest power management technology and design concepts

E-books are undoubtedly the hottest application in the current portable electronics market. So what are the biggest competitive advantages and selling points of e-books? What should be paid attention to in the power supply design of e-books? How can the screen of e-books be different from others? How can the e-books have a super long standby time? Wang Yi, business development engineer of TI Semiconductor Division, analyzed and discussed these issues that everyone is concerned about.

Wang Yi pointed out that the difference between E-book and other electronic products is that it has a special screen that can still display images after the power is turned off. The most important thing about e-books is the screen. At present, the screen technology of e-books is relatively simple. To achieve differentiation from other manufacturers, it is necessary to ensure that the e-book has a long life and will not age over time. At the same time, the quality of the product can also be tested by the speed of the page turning display on the LCD screen. When talking about the design considerations of the E-book's ultra-long standby time, Wang Yi pointed out that the biggest selling point of TI E-reader is the ultra-long standby time, which can be up to three months.

TI's TPS6518x series E-INK dedicated PMIC has a unique Source Driver Supplies Tracking function, which can ensure that the E-INK screen maintains a long service life and slows down the aging of the screen.

Regarding the battery management of lithium batteries, Wang Yi said that lithium batteries are very easy to use, but they can also be dangerous and cause various explosions. There are several safety considerations for the battery management of lithium batteries. First, the optimal charging temperature is 0 to 45 degrees Celsius, and the temperature must be taken into account in the charging management. Second, the charging time. It is impossible to say that no electricity can be charged at the end of charging, so you need to pay attention to when to standby. Generally, charging is turned off at half C. As for the charging process, the first is the battery voltage, as shown in the figure below, the blue is the voltage, and the red is the current. If the battery is between 2 and 3, you need to pay attention at this time. This is called stream charging. Charge it slowly, and then the voltage will continue to increase. When it drops to a certain level, it means that the charging can be stopped. There is also the 28th law. When charging, it only takes 20% to 30% of the time to fully charge the battery by 80%.

The new generation of OptiMOS meets the needs of high efficiency and low power consumption

Using energy more efficiently, that is, consuming less electricity, is the most effective way to ensure future energy security. Infineon has been committed to providing efficient MOSFET solutions for products in the fields of industry, telecommunications, consumer electronics and home appliances. Infineon's senior application engineer Zhang Jiarui focused on introducing its new generation of OptiMOS products and solutions. By using OptiMOS devices, portable product power designers will be able to reduce the power consumption of the product, reduce its thermal load, and even reduce its size.

Zhang Jiarui pointed out that Infineon's new generation OptiMOS is a comprehensive efficiency improvement. The old products had a high switching rate, so the efficiency decreased significantly, but for the new generation OptiMOS, the efficiency decrease is very small. OptiMOS is an ideal choice for some devices that require high power and high switching rate.

When talking about the new development direction of Infineon's MOSFET products, Zhang Jiarui said that taking Infineon's 25V OptiMOS products as an example, it is necessary to rely on some new packaging methods to expand products. The 25V OptiMOS discrete devices use three packaging forms: SuperSO8, CanPAK and ultra-small S3O8 packages. The S3O8 package size is only 3.3 mm x 3.3 mm. If the S3O8 package is used, the size of a six-phase converter is only 1,120 square millimeters, which is 45% to 55% smaller than the other two packages.

The 25V OptiMOS devices have an even better figure of merit in terms of energy efficiency compared to devices using low on-resistance trench technology and ultra-low gate charge lateral MOSFET concepts. With the same on-resistance, the gate charge of the new OptiMOS 25V devices is 35% lower than that of the closest trench process, while the output charge is half that of the best lateral MOSFET devices.

Power Management - A Success Factor in Portable Product Design

What are the key factors for success when designing portable products? Efficiency is the first priority. For portable products, efficiency is very critical. The higher the conversion efficiency you can provide, the longer the battery can work, and it can also meet the green energy design. Second, the so-called portability must be easy to carry, the product must be made very small, and from the IC perspective, a small package must be used to provide a smaller energy. This is separate from high efficiency. Use a very small package and integrate more functions. The fewer peripheral components, the better. The chip is highly integrated, and there is no need to use a lot of poles and circuits. Smallness is very important. Third, safety. Safety is very important for both consumer electronics and other types of electronics. Cargo temperature protection and reverse pressure are indispensable. Fourth, it must be easy to use and design. Easy to design, my components must be very few and very simple. These four are the key factors in the design of portable products.

When AATI Field Application Engineering Manager Mao Zheng proposed the above four factors, he put efficiency first. The improvement of energy conversion efficiency is due to excellent power management design. Mao Zheng shared AATI's latest technologies and products in power management with hundreds of professional audiences on site. In addition, AATI's overvoltage protection and dynamic charging management, as well as interface protection solutions, also aroused great interest among the audience.