The processor in a smartphone or a tablet requires more and more power to deliver high performance. Additionally, the around-the-clock usage of portable devices requires more battery capacity. The high power consumption of a smartphone or a tablet and the limited capacity of the embedded battery generate power anxiety for users.
Figure 1 is a picture I took at the Chicago O’Hare International Airport charging station. Many people were watching both their charging percentage and the time to make sure that they didn’t miss their flight.
Figure 1: A charging station at Chicago’s O’Hare International Airport
A power bank is a portable secondary battery that stores energy when AC power is available and can charge a smartphone or a tablet to replace the AC adapter. Power banks are one of the most popular personal accessories these days.
A two-stage power bank has one single-cell battery charger to step down the adapter voltage to charge the battery, followed by one boost converter to step up the battery voltage to USB-compliant 5V. Two sets of switches and inductors are required to perform the charging and boost separately. Texas Instruments has developed a full range of power-bank IC solutions that require only one set of switches and an inductor to perform both charging and boost functions. The idea is to operate the boost with reusing the set of switches and inductor for charging, since charging and boost don’t happen at the same time.
The bq24195/195L and bq24295 are still ideal for solutions up to 2.1A. The newly released bq25892 with MaxCharge™ technology pushes the boundaries of efficiency and thermal performance. The blog “MaxChargeTM Technology – Faster Charge with More Mobility” shows the features of faster, cooler and safer charging. The bq25895 not only achieves up to 5A fast charging but also takes the boost current to 3.1A, making simultaneously charging both a smartphone and a table possible. Solve your technical challenges with these solutions:
Figure 2: Fully integrated single-chip power bank solution
These fully integrated power-bank ICs with high conversion efficiency, capable of 1A to 3.1A backup charging current, deliver a compact design and a high level of safety. Consider incorporating these solutions in your next mobile power design and eliminate battery anxiety.
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.