原标题：基于TPS63020的高效小型升降压电源技术

　　基于TPS63020的高效小型升降压电源技术

　　TPS6302x是TI 公司的高效小型升降压电源解决方案,输入电压从1.8V到5.5V,输出电流可高达3A,固定和可调输出电压从1.2V到5.5V,效率高达96%,能在降压和升压模式自动转换,静态电流小于50uA,固定工作频率2.4MHz,可用于所有两节和三节碱性电池, NiCd 或NiMH或单节锂电池供电的设备,超小型移动PC和MID,数码媒体播放器,DSC和摄像机.本文介绍了TPS6302x主要特性,方框图, 可调输出电压典型应用电路图以及TPS63020EVM评估板特性,电路图和材料清单(BOM).

　　The TPS6302x devices provide a power supply soluTIon for products powered by either a two-cell or three-cell alkaline, NiCd or NiMH battery, or a one-cell Li-Ion or Li-polymer battery. Output currents can go as high as 3A while using a single-cell Li-Ion or Li-Polymer Battery, and discharge it down to 2.5V or lower. The buck-boost converter is based on a fixed frequency, pulse-width-modulaTIon (PWM) controller using synchronous recTIfication to obtain maximum efficiency. At low load currents, the converter enters Power Save mode to maintain high efficiency over a wide load current range. The Power Save mode can be disabled, forcing the converter to operate at a fixed switching frequency. The maximum average current in the switches is limited to a typical value of 4A. The output voltage is programmable using an external resistor divider, or is fixed internally on the chip. The converter can be disabled to minimize battery drain. During shutdown, the load is disconnected from the battery. The device is packaged in a 14-pin QFN PowerPAD™ packagemeasuring 3 × 4 mm (DSJ).

　　TPS63020主要特性:

　　Up to 96% Efficiency

　　3A Output Current at 3.3V in Step Down Mode (VIN = 3.6V to 5.5V)

　　More than 2A Output Current at 3.3V in Boost Mode (VIN > 2.5V)

　　Automatic Transition Between Step Down and Boost Mode

　　Dynamic Input Current Limit

　　Device Quiescent Current less than 50µA

　　Input Voltage Range: 1.8V to 5.5V

　　Fixed and Adjustable Output Voltage Options from 1.2V to 5.5V

　　Power Save Mode for Improved Efficiency at Low Output Power

　　Forced Fixed Frequency Operation at 2.4MHz and Synchronization Possible

　　Smart Power Good Output

　　Load Disconnect During Shutdown

　　Overtemperature Protection

　　Overvoltage Protection

　　Available in a 3 × 4-mm, QFN-14 Package

　　TPS63020应用:

　　All Two-Cell and Three-Cell Alkaline, NiCd or NiMH or

　　Single-Cell Li Battery Powered Products

　　Ultra Mobile PC’s and Mobile Internet Devices

　　Digital Media Players

　　DSC’s and Camcorders

　　图1.TPS63020功能方框图

　　图2.TPS63021功能方框图

　　图3.TPS6302x可调输出电压典型应用电路图

　　TPS63020EVM评估板

　　The TPS63020EVM evaluation module (EVM) is designed to help the user easily evaluate and test the operation and functionality of the TPS63020. This user’s guide includes setup instructions for the hardware, a schematic diagram, a bill of materials, and printed-circuit board layout drawings for the evaluation module.

　　TPS63020EVM评估板主要性能表:

　　图4.TPS63020EVM-487评估板电路图

　　TPS63020EVM-487 材料清单(BOM):