基于TPS63020的高效小型升降壓電源技術
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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
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