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| Summit SMB119可编七路电源方案 | |||||
作者：Summit 文章来源：Summit 点击数： 更新时间：2008-6-24  |
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Seven-Channel Programmable DC-DC Power Manager SMB119 The SMB119 is a highly integrated and flexible seven-channel power manager designed for use in a wide range of portable applications. The built-in digital programmability allows system designers to custom tailor the device to suit almost any multi-channel power supply application from digital camcorders to mobile phones. The SMB119 integrates all the essential blocks required to implement a complete seven-channel power subsystem including three synchronous step-down “buck” converters, one configurable step-up “boost” or step-down synchronous “buck” converter, two step-up (boost) converters, and one linear regulator (LDO). Additionally sophisticated power control/monitoring functions required by complex systems are built-in. These include digitally programmable output voltage setpoint, power-up/down sequencing, enable/disable, margining, dynamic voltage management, and UV/OV input/output monitoring on all channels. By incorporating a second ENABLE input and 7-level dynamic voltage control, the SMB119 is ideal for powering systems based on Xscale™ and other similar processors. The integration of features and built-in flexibility of the SMB119 allows the system designer to create a “platform solution” that can be easily modified via software without major hardware changes. Combined with the re-programmability of the SMB119, this facilitates rapid design cycles and proliferation from a base design to futures generations of product. The SMB119 is suited to battery-powered applications with an input range of +2.7V to +6.0V and provides a very accurate voltage regulation (<1.5%). Communication is accomplished via the industry standard I2C bus. All user-programmed settings are stored in nonvolatile EEPROM of which 96 bytes may be used for general-purpose memory applications. The commercial operating temperature range is 0C to +70C, the industrial operating range is –40C to +85C, and the available package is a 48-pad 7mm x 7mm QFN. 主要特性: Digital programming of all major parameters via I2C interface and non-volatile memory Output voltage setpoint/margining Sequencing & digital soft start Enable/Disable outputs independently Input/Output UV/OV voltage thresholds PWM/PFM mode Seven programmable regulator channels with 1.5% accuracy Three synchronous step-down (buck) with internal PFETs Two step-up (boost) One configurable step-up (boost) or step-down (buck) One adjustable output voltage LDO +2.7V to +6.0V Input Range (Higher system voltages supported) Built-in current limiting, UV/OV, and thermal protection Highly accurate reference and output voltage (<1.5%) 1MHz PWM frequency and automatic power-saving PFM mode 96 bytes of user configurable nonvolatile memory Space-saving 7x7 QFN-48 package 主要应用: Portable Media Players Digital camcorders/still cameras Smart PDA/Camera phones Handheld GPS/PDAs Portable Equipment  图1. SMB119 7路应用方框图  图2. SMB119典型应用电路图(QFN-48封装)  图3. SMB119可编程功率管理器应用电路图 详情请见: http://www.summitmicro.com/prod_select/summary/SMB119/SMB119_2126.pdf |
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