AnalogicTech Unveils USB/AC Battery Charger ICs for Portable Systems

Advanced Analogic Technologies Incorporated (AnalogicTech) (Nasdaq: AATI), a developer of power management semiconductors for mobile consumer electronic devices, announced a comprehensive line of USB/AC battery charger ICs for portable systems operating off single-cell 4.2V (4.375V) Lithium Ion/Polymer batteries. Integrating a wide array of features into a highly compact footprint and requiring just a single external component, these new devices offer complete USB/AC charging function in packages as small as 2.0 x 2.1 mm.

“Designers of today’s cellular handsets, Bluetooth headsets, MP3 players and digital cameras must offer comprehensive USB/AC charging capability while sacrificing as little of their limited product footprint as possible,” said Siamak Bastami, product line director for AnalogicTech. “By offering a wide array of choices from comprehensive solutions with integrated digital thermal regulation to relatively basic alternatives with automatic trickle charge and battery pre-conditioning options in extremely compact packages, this product family enables the optimal solution in the smallest footprint for their target market.”

Integrated Digital Thermal Regulation
The AAT3683 offers the most comprehensive feature set in the new product family. This highly integrated, single input USB/AC charger supports programmable charge currents up to 1A. Operating off a voltage input range of 4.0V to 6.5V, the AAT3683 integrates a charging device, reverse blocking diode and current sensing to regulate battery charge voltage and current for 4.2V (4.375V) Li-ion/polymer battery cells. The battery charger IC includes a digital thermal regulation circuit developed and patented by AnalogicTech which automatically reduces the charging current when the internal temperature of the die exceeds a preset limit to prevent the device from thermal shutdown. This feature helps minimize charge time by maintaining the maximum possible battery charging current for a given set of input to output, power dissipation and ambient temperature conditions. The AAT3683 also adds an integrated charge timer which automatically terminates charging functions if a defective battery cell does not accept a charge over a preset period of time.

The AAT3684 is a single-input USB/AC adapter charger with charge current programmable from 15 mA to 500 mA. The device offers automatic trickle charge for battery pre-condition as a standard feature. The optional AAT3684-1 version comes without the trickle charge capability.

The AAT3681A is a derivative of the AAT3681 previously announced by AnalogicTech in April, 2006. Designed for space-constrained, portable applications requiring up to 500 mA from either a USB or AC source, the AAT3681A comes in a highly compact 2.0 x 2.1 mm SC70JW package. Unlike its predecessor, this battery charger IC is also available with a variety of trickle charge, active enable high and low, and charge termination threshold current options.

Each of the new charger ICs offer overvoltage, short-circuit and over temperature protection. The AAT3683 adds over-current protection.

Price and availability
All three devices are specified across the -40 degrees to +85 degrees C temperature range. The AAT3681A is available in a Pb-free, 8-pin, 2 x 2.1 mm SC70JW package and sells for $0.81 in 1,000 piece quantities. The AAT3683 is available in Pb-free, 10-pin 2.2 x 2.2 mm STDFN and 16-pin QFN-33 packages. It sells for $0.98 in 1,000 piece quantities. The AAT3684 is available in a 10-pin 2.2 x 2.2 mm STDFN package and costs $0.92 in 1,000 piece quantities.

About AnalogicTech
Advanced Analogic Technologies Incorporated (AnalogicTech) is a supplier of power management semiconductors for mobile consumer electronic devices, such as wireless handsets, notebook and tablet computers, smartphones, digital cameras, and digital audio 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 is headquartered in Sunnyvale, California, with offices in Beijing, Hong Kong, Japan, Shanghai, Shenzhen, South Korea, Sweden, UK, France, and Taiwan, as well as a worldwide network of sales representatives and distributors.

AnalogicTech and the AnalogicTech logo are trademarks of Advanced Analogic Technologies Incorporated.