Advanced Analogic Technologies Incorporated (AnalogicTech) (Nasdaq: AATI), a developer of power management semiconductors for mobile consumer electronic devices, announced the AAT3663, the first in a family of new 1A linear battery charger ICs capable of charging up to two Li-ion cells in series. Designed to operate from either an AC adapter or a USB port, this new device features AnalogicTech’s innovative Digital Thermal Loop charge reduction circuit which monitors the internal die temperature and gradually steps down the charge current to avoid thermal shutdown.
“A growing number of products, from Portable Media Players (PMPs) and digital cameras to point of sale (POS) solutions and high-end handsets, are powered today by two Li-Ion cells connected in series,” says Siamak Bastami, product line director for AnalogicTech. “By supporting input voltages up to 13.2-V, the AAT3663 offers designers the opportunity to replace larger and more expensive discrete charging solutions with a high integrated and more cost effective alternative.”
Inputs up to 13.2-V
The AAT3663 operates across a 4.0-V to 13.2-V input voltage range and supports user programmable charge current from 100 mA up to 1A via an external resistor. Quiescent current is less than 6 uA.
The device features an intelligent digital thermal loop charge reduction circuit which optimizes battery charge rate by constantly measuring die temperature and adjusting the charge current to compensate for thermal conditions. Unlike many competitive charger ICs, this closed loop thermal management system allows the charger to continue charging even under harsh environmental conditions, therefore minimizing charge time.
The new charger IC also features a programmable charge termination current feature which sends the device into sleep mode if the charging current dips below a pre-defined threshold. An integrated programmable charge timer can be used to shut down charging functions if a defective battery cell or a disconnection to the battery current path is detected.
The AAT3663 continuously monitors battery temperature and charge state for fault conditions. To protect the charging device, and the battery under charge, integrated over-temperature, short-circuit, over-voltage and over-current protection circuits automatically shuts down the device if a fault occurs.
New Process Technology
The AAT3663 is fabricated in AnalogicTech’s proprietary ModularBCD process. Compared to linear-IC legacy fabs and generic digital CMOS foundries, ModularBCD provides more cost-effective, modular fabrication of analog, power and mixed-signal ICs by monolithically integrating fully-isolated CMOS at multiple voltages, complementary bipolar transistors, and robust power devices. This process avoids complex and expensive techniques such as epitaxy and high-temperature diffusion. Devices manufactured in ModularBCD offer higher efficiency, smaller size and higher levels of integration than those fabricated in many other processes.
Price and availability
Specified for operation across the -40 C to +85 C temperature range, the AAT3663 is available in a thermally-enhanced 14-pin, 3×3-mm TDFN package. It sells for $1.38 in 1K quantities.
Advanced Analogic Technologies, Inc. (AnalogicTech) is a supplier of Total Power Management(TM) semiconductor solutions for mobile consumer electronic devices, such as wireless handsets, notebook and tablet computers, smartphones, digital cameras, wireless LAN, and personal media players. The company focuses its design and marketing efforts on the application-specific power management needs of consumer, communications, and computing applications in these rapidly evolving devices. AnalogicTech also develops and licenses device, process, package, and application-related technology. AnalogicTech is headquartered in Santa Clara, California and Macau, S.A.R., with offices in China (Beijing, Shanghai and Shenzhen), Hong Kong, Taiwan, Japan, South Korea, Sweden, France and United Kingdom, as well as a worldwide network of sales representatives and distributors. The company is listed on the NASDAQ exchange under the ticker symbol AATI.
AnalogicTech and the AnalogicTech logo are trademarks of Advanced Analogic Technologies Incorporated.