Description

For portable power applications to take advantage of the small size and high energy density of modern battery technology, they must operate efficiently over the full battery-discharge voltage range. This presents a design challenge for Li-ionpowered systems requiring a 3.3-V bus. While standard buck converters excel at efficiently converting a 4.2- to 3.0-V Li-ion battery to lower output voltages such as 1.8 V, and standard boost converters efficiently convert a Li-ion battery to higher output voltages such as 5 V, neither provides an optimal solution for generating the everpresent 3.3-V bus. Topologies such as the SEPIC and traditional buck-boost utilize the full battery capacity but suffer from drawbacks such as low efficiency, high cost, increased board area, and high part count. The TPS6300x, available in three configurations, can solve many of these problems. The TPS63000 has an adjustable output from 1.2 V to 5.5 V. The TPS63001 and TPS63002 outputs are fixed at 3.3 V and 5.0 V, respectively. All are available in the space-saving 10-pin QFN (DRC) package.