Portable Device Information A
Mobile phones, multimedia players (PMP), MP3 players, digital cameras, portable video game consoles, personal navigation systems (PNA), etc., these popular consumer favorite portable consumer electronics products, a basic problem is: their functions become increasingly diverse and increasingly sophisticated dimension, but the increase in energy density batteries can not keep up much faster and ever-increasing complexity of the power requirements of portable devices, and people still want to be able to charge the case of a longer time interval, take advantage of these short, light, portable consumer electronics to enjoy mobile entertainment and mobile communications. In particular, the integration of these products feature the trend, for example, with a camera and camera-enabled mobile phones, personal digital assistants (PDA), Global Positioning System (GPS), MP3 and video functionality into a smart phone, further exacerbating the problem severity.
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Another trend of portable devices is to add high-capacity micro-hard drives, so smart phones, PMP and so on with high-density storage capacity. Used in most of the hard drive has a diameter of 1 inch or smaller discs in the disc rotation speed up the process, the peak current demand may be as high as 500mA, this is undoubtedly to the tight power budget even worse. 2.5-inch, 3-inch or even 5-inch color lcd screen makes the gradual introduction of a highly efficient LED backlight and the LCD bias power supply continues to be closely watched | Regulators management techniques. In addition, MP3, PDA, GPS devices and laptop computers widely used USB interface, both data transfer and charging a single miniUSB interface to become the future development trend of mobile phones, which also requires a new battery management and power management chips.
Fortunately, the continuous development of power management technology is to meet the portable consumer electronics products to the battery life, functional integration, reliability, form factor and cost of these events from conflicting application requirements. For example, using the power path management technology, battery charger IC allows to charge the battery at the same time operating system; combined switching regulator and LDO regulator advantage of the new power management IC to further improve the power conversion efficiency; dynamic power conditioning technology effectively improve efficiency in the use of load power; Power Management Unit (PMU) is in a very small area where integration of almost all power features, to minimize the power system footprint. This article will focus on products for portable consumer electronics applications, battery charge management IC, LDO, DC / DC regulator, PMU, LED power driver IC power management techniques such as the latest trends and solutions.
Power path management technology to meet the demand for electricity supply while charging and load
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Most of portable consumer products generally are available through an AC adapter, a USB cable or a Universal Li-Ion / Li-polymer batteries to power. Sometimes people want to charge to the device while continuing to watch video, phone, or play games. To meet the charging process in the system, high-current requirements, it is likely the charge current is relatively small, resulting in inaccurate charge management directives phenomenon. Therefore, the supply of power between the path management is very important.
Linear Technology's LTC3555 to resolve these problems, it has AC adapter, USB cable and lithium-ion batteries seamlessly between the power path management, and follow the standard USB power. The chip also has an offer of up to 1.2A charge current of a fully functional lithium-ion / Li-polymer battery charger, as well as three high efficiency synchronous buck converter (used to generate the majority of USB peripherals require low-voltage rails ). LTC3555's power transmission method is different from the existing battery and power management IC (the latter is the charger feed system). In such systems, the external power supply is not directly power to the load, instead of using AC adapter or USB port to recharge the battery, then battery power to the load. If the battery is deep discharged, then the load was in power there will be a delay in the process. This is because the battery charge amount to obtain the required minimum can not be before the draw power from it. LTC3555 can be used to eliminate the delay, allowing portable devices to a wall adapter or USB power supply immediately after the power-on access. In addition, the chip will also load all of the available unused power is used to charge the battery.
"It can bring two advantages, namely, to eliminate charging delay, and allow the battery charging and load supply at the same time, thereby prolonging the effective functioning of the application time, and when connected with the USB cable to speed up the charging speed. This power management Another advantage is that method can be used in the AC or USB power supply situation to improve efficiency. "Linear Technology Product Marketing Manager Tony Armstrong said.
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In addition, mobile phone charger and interface technology standardized in line with people's needs, a single miniUSB port for data transmission also used for both power and become the future trend of development. TI's single-cell lithium-ion battery charge management IC BQ24070 precisely to meet this need. As a TI high level of integration bqTINY-III series of charging and system power management device 1, which integrates 2A AC power switch, 1.5A charging FET, current sensor, reverse blocking protection and thermal regulation such as battery-management functions. It uses TI's dynamic power path management (DPPM) technology, can be supplied to the system while independently charging the battery, and according to the system voltage dynamic adjustment charge current.
TI's high-performance analog products senior marketing engineer HE Xin Long introduced the Road, "BQ24070 support a single miniUSB interface automatically selects AC Adapter or USB-powered, and can choose different according to different charging rate of power supply. When the power supply shortage The charging Wi-Fi, Bluetooth and mobile TV and other functions that require momentary high-current, the battery power can be added. "
In recent years, multi-function battery-power management IC affordable battery charging, DC / DC conversion, battery protection, battery monitor or power supply options. For example, TI's TPS65800 also USB port and AC adapter power supply to provide a flexible charging and system power path management. It by the Li-ion or lithium polymer battery-powered applications, also has more power output and several circuit choices. TPS65800 in a separate charging the battery when the power supply system also reduce the battery charge and discharge cycles. It automatically selects the USB port or AC adapter as the system's power. In the USB configuration, the host can be set in the pre-charge rate of 100mA, and 500mA choose. IC based on the system load on the USB charge rate dynamically adjusted to maintain the charge rate of 100mA or 500mA.
Microchip's MCP73811 and MCP73812-type (MCP7381x) Lithium-ion / Li-polymer charge-management controllers also provide fully integrated charge-management functions, as well as up to 500mA selectable or programmable charge current. They are compatible with USB, also equipped with integrated current sense, pass transistor, as well as on-board reverse-battery protection. MCP7381x charge-management controller is compatible with USB output-power specifications, the majority of personal computer through the USB port to take power without the need to connect an external power adapter. In addition, these devices have on-chip thermal regulation function, can be reduced when the temperature rises above safe levels of charge current.
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