基于TPS63020的高效小型升降壓電源技術(shù)

TPS6302x是TI 公司的高效小型升降壓電源解決方案,輸入電壓從1.8V到5.5V,輸出電流可高達3A,固定和可調(diào)輸出電壓從1.2V到5.5V,效率高達96%,能在降壓和升壓模式自動轉(zhuǎn)換,靜態(tài)電流小于50uA,固定工作頻率2.4MHz,可用于所有兩節(jié)和三節(jié)堿性電池, NiCd 或NiMH或單節(jié)鋰電池供電的設(shè)備,超小型移動PC和MID,數(shù)碼媒體播放器,DSC和攝像機.本文介紹了TPS6302x主要特性,方框圖, 可調(diào)輸出電壓典型應(yīng)用電路圖以及TPS63020EVM評估板特性,電路圖和材料清單(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應(yīng)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

圖1.TPS63020功能方框圖

圖2.TPS63021功能方框圖

圖3.TPS6302x可調(diào)輸出電壓典型應(yīng)用電路圖

TPS63020EVM評估板

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評估板主要性能表:




圖4.TPS63020EVM-487評估板電路圖

TPS63020EVM-487 材料清單(BOM):