Three-level 6A buck battery charger halves power supply size and charge time
Operating at up to 1 MHz, the combination of the UCC28780 active clamp flyback controller and the UCC24612 synchronous rectifier controller cuts the size of AC-DC adapters and USB Power Delivery (USB-PD) chargers.
For battery-powered electronics that need maximum charging efficiency in a small solution size, the bq25910 6A three-level buck battery charger enables a 60 percent smaller footprint in smartphones, tablets and electronic point-of-sale devices.
The UCC28780 is designed to work with both gallium nitride (GaN) and silicon (Si) FETs to enable an active clamp flyback topology. Multimode controls change the operation based on input and output conditions so that the combination of the UCC28780 with the UCC24612 can achieve up to 95% efficiency at full and light loads at 1MHz. It also uses adaptive zero voltage switching (ZVS) so that engineers can easily design their systems with a combination of resistor settings and controller auto-tuning.
The standby power of less than 40 mW exceeds the Code of Conduct (CoC) Tier 2 and U.S. Department of Energy (DoE) Level VI efficiency standards.
For designs above 75 W, engineers can also pair the chipset with a new six-pin power-factor correction (PFC) controller, the UCC28056, which is optimized for light-load efficiency and low standby power consumption to achieve compliance with mandatory International Electrotechnical Commission (IEC)-61000-3-2 AC current harmonic limit regulations.
Using a new three-level power-conversion technology, the bq25910 enables up to 50 percent faster charging compared to conventional architectures by dramatically reducing thermal loss. Integrated MOFSETs and lossless current sensing reduces the printed circuit board (PCB) space and allows designers to use small 0.33-µH inductors, saving even more space, while providing 95 percent charging efficiency to take a standard smartphone battery from empty to 70 percent charged in less than 30 minutes.
A differential battery-voltage sense line enables fast charging by bypassing parasitic resistance in the PCB for more accurate voltage measurements, even if the battery is placed away from the charger in the system.
“Consumers want faster charging in a smaller footprint. These new solutions not only accomplish that, but also enable designers to do more than they could before with less power,” said Steve Lambouses, TI vice president, High Voltage Power.
The devices are available small outline and wafer scale packages from $0.60.
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Price for 1,000-unit quantities |
US$0.60 |
US$0.40 |
US$0.37 |
US$2.10 |
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Package type |
Small outline integrated circuit (SOIC) and quad flat no-lead (QFN) |
Small outline transistor (SOT)-23 |
SOT-23 |
Wafer chip-scale package (WCSP) |
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Evaluation module (EVM) |
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