Portable Power Management
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For portable applications power | Regulators management is becoming the field of eye-catching highlight of the semiconductor. According to market research firm CIR report released by the market the next few years, the power supply devices for portable applications based on the market prospects are very positive.
Portable devices growing number of new features, power management will be the formation of a large number of new demands. At the same time, portable device manufacturers are facing increasing pressure, they must integrate these features into ever-shrinking in size, the same time it maintained a long working hours.
For example, with the advent of 3G, mobile phones not only to browse the Web, send e-mail, take digital photos, or even to be able to play the video stream, which will bring enormous challenges in power management. Meanwhile, with the acceleration of processor speed, the entire power management program and the various sub-systems must keep pace with this change, providing support for supporting the power. In addition, the new battery technologies, especially micro fuel cell technology commercialization is about to begin, forcing chip makers to rethink the future of the power supply system design.
Correspondingly, these new trends but also the power to create tremendous business opportunities for chip makers, prompting them racked their brains to develop more advanced, with different features and sizes getting smaller and smaller power management solutions to support the increasingly complex system power requirements and new features. To fully understand the depth of today's portable power management applications on the latest trends, this paper specially invited a leading semiconductor company Texas Instruments | Instruments (TI), Fairchild (Fairchild), Linear (Linear), ON Semiconductor, National Semiconductor (NS), Microchip Technology (Microchip) and RichTek Technology to share their insights and wisdom.
Power management device package, to strike a balance between efficiency and cost
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In the terminal equipment of the small size trend, the systems engineer required to power the device must be able to extend battery life and reduce circuit board area. Suppliers in the design of these devices, you need efficiency, package size and cost trade-off between the repeated. Fairchild Semiconductor's Asia Pacific president, Kuo said: "The small package size of the cooling capacity of less than large-size packages, forcing us to improve the efficiency of power conversion devices."
Microchip's Analog and Interface Products Division, senior marketing manager George Paparrizos pointed out that the system design, power depends on the input / output voltage and the difference between the required load current. "As the new digital devices require larger currents, the two main ways to reduce energy consumption only slightly higher than the input voltage for the introduction of the output voltage, or take intelligent control system." He said that the higher power requirements, stimulus that can save space and have a higher thermal performance, a new packaging technology development, but also so that no-lead package (DFN and QFN) popular.
Voltage conversion in portable applications is also increasing the number, it was considered necessary for power conversion using the same high-density packaging. TI Portable Power Management Global Business Marketing Manager Patrick Heyer, said: "The improved packaging technology will continue to work to reduce the footprint area, close to the size of the internal silicon, providing a good thermal conductivity, lower costs and meet the standards of customer processing requirements. More chip packaging technology will be allowed to provide more comprehensive functionality, while minimizing external component count. "
He also pointed out that the wire (Bond wires) will continue to give the solder bump, or other innovative technologies that allow the power chip can withstand high current, high fever and high-frequency signals. Innovative circuit design, performance will be used to create the conditions to improve the characteristics of these features include soft-switching, optimized gate driver, higher precision, higher switching frequency and better control algorithms.
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Most of today's portable devices are present in a variety of charging power supply, in order to narrow the circuit board space to achieve the best efficiency and power management for battery design becomes increasingly complex. Linear's Power Business Unit product marketing manager, Tony Armstrong, said: "Just look at such as digital cameras, MP3 players, GPS receivers and PDA, etc. can be at a glance. Most of these products by the AC adapter, USB interface or a lithium-ion battery-powered. The power supply between the access control is a major challenge. "
He went on to say, engineers have been trying to use discrete components to achieve the above functionality, but it faces great difficulties, such as hot-swappable and can cause serious system problems of surge current. Most battery-powered portable products use a dedicated power supply chips to achieve the battery charging, power of access control, providing multiple supply voltages, and as a true output disconnect and accurate USB current limit such protection. The reasons for adopting this approach is very clear, that only a single device can satisfy all of its power management requirements. However, doing so also has shortcomings, dedicated power supply chips, congenitally deficient lead to very difficult for all the above functions to achieve maximum performance, and made the transition from product design to production time becomes very long.
The field of power management for the future development trend, the National semi-Asia-Pacific portable device power management product marketing manager for Luo Zhenhui that the future power management system should not only focus on the switching regulator of the conversion efficiency, should also carefully consider whether the power management chip stability in bulk supply as well as the package is small, and even a very small package, the chip power consumption, accuracy and noise levels should not be subject to the slightest impact.
Mobile phone flash created a new demand
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Camera phones and other functions in the emergence and continued deepening of the power management of a more serious challenge, because these new features are basically belong to the "energy-hungry" applications. For example, consumers want to be able to capture higher resolution camera phone pictures, and can indoors or in dim ambient light conditions to shoot. These requirements compel designers to start thinking about in the phone configuration flash functions, while the white light led to become the preferred flash light.
For handset design engineers, the white LED has a variety of features they need: small form factor, high-brightness output and to provide flash and continuous video capability lighting, LED vendors have developed specifically for mobile phone flash of high output power LED. However, these high-brightness LED While it is suitable for lighting purposes, but they are also big battery power.
"Although the use of high-power LED to form a visible light of this basic task is simple, but if we do not improve the existing design, it is difficult to build high-performance power supply and current control programs." Linear's Armstrong said. According to him, Linear's LTC3453 is a designed to optimize the efficiency, accuracy and LED current control products designed to examples, suitable for high-current camera flash applications. The product uses synchronous buck - boost-type power architecture and programmable low dropout current sources to regulate LED current.
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The device according to VIN and LED forward voltage synchronous buck, synchronous boost and four-switch buck - boost mode automatically transform between. Each current source has its own independent control loop, and can at a very low LEDx pin voltage regulator under the conditions of current, designed to minimize power consumption. With the synchronous buck - boost topology, "flashlight" mode efficiency up to 90% more than the standard step-up compared to alternative solutions to enhance a rate of 20 ~ 30%.
Fairchild Semiconductor, introduced a highly efficient LED flash driver FMS2000 and FMS2004. Alleged that these devices can flash intensity / duration, reduce red-eye reduction, movie mode, white balance, and the battery voltage compensation features programmable control.
In addition, Microchip's Security, Microcontroller and Technology Division product marketing manager, Fanie Duvenhage also said that flash microcontroller will also play an important role in the solution. He said: "People want to be able to adapt to different flash brightness level to a different order of the flash, and display a different color. This can not be stand-alone power conversion chip, but rather the need for additional programmable microcontroller. However, many Designers do not want to be outside the micro-controller for a power conversion device pays for, so power conversion functions are often included in micro-controller being. "
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