Dual-Input Charger IC intelligently manages ADP, USB inputs.
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Press Release Summary:
Supplied in 16-pin, 3 x 4 mm TDFN package, AAT3691 regulates battery charge voltage and current for 4.2 V lithium-ion battery cells used in portable systems. Integrated over-voltage protection (OVP) up to 28 V offers response time under 1 µsec, and IC supports inputs from AC adapters as well as USB ports across 3.0-6.75 V (typ) range. Charger intelligently assesses which input source offers minimum charging time and modifies charge path accordingly.
Original Press Release:
AnalogicTech's Dual Input Charger IC Maximizes Reliability, Reduces Footprint with Integrated OVP
Smart Battery Charger Intelligently Manages ADP, USB Inputs
SANTA CLARA, Calif., Jan. 13 -- Advanced Analogic Technologies, Inc. (AnalogicTech(TM)) (NASDAQ:AATI), a developer of power management integrated circuits, announced today the AAT3691, a dual input battery charger IC with integrated over-voltage protection (OVP) up to 28V. Designed to meet industry requirements for highly flexible and reliable battery charging from multiple sources, the new battery charger supports inputs from both AC adapters and USB ports in applications such as mobile phones, digital still cameras and other handheld devices. The charger intelligently assesses which input source offers minimum charging time and modifies the charge path, while the integrated OVP protects the battery and system against faulty input.
"Today's portable system designers need a battery charging solution that not only supports input from both AC adapters and USB ports, but also protects the battery, the charger and the system," says Siamak Bastani, Product Line Director. "By integrating OVP protection up to 28V for both inputs, the AAT3691 helps designers maximize charging flexibility and reliability while reducing parts count and end product footprint."
Fast OVP Response
The AAT3691 is designed to regulate battery charge voltage and current for 4.2V lithium-ion battery cells used in a wide variety of portable systems. As an integrated battery charger IC which combines a power device, reverse current blocking and current sensing, the device is designed to operate from AC adapter inputs and USB ports across a 3.0V to 6.75V (typical) input voltage range.
To maximize safety, the AAT3691 adds integrated OVP up to 28V. The OVP block offers an extremely fast response of < 1 us.
Charge current can be programmed up to 1.6A for charging via an ADP and up to 0.5A for charging via a USB port using external resistors. When ADP or USB input power exceeds 6.75V typical, an internal series switch opens preventing damage to the battery or charging circuit. Charging and OVP total ON resistance (RDS(ON)) for the AAT3691 is a very low 600 milliohms max. Automatic charge selection circuitry recognizes the best charging source in terms of input voltage and other criteria and modifies the charge path to minimize charge time.
The AAT3691 also features a no battery present input (NOBAT) detection function which prevents input power from passing through the OVP block and suspends charging when no battery is present or a battery trace or connector is defective.
The new charger IC also offers a variety of other protection features to protect the charging device, the control system and the battery. Battery charging status is continually monitored for fault conditions. Safety features include thermal shutdown protection, power on reset and soft start.
Second Charger IC
AnalogicTech is also offering a slightly modified version of the AAT3691 which provides all the features described above and adds an integrated LDO. The LDO on the AAT3695 (to be available Q2, 2009) can be used to power a transceiver or housekeeping microcontroller on a cell phone or other portable device during the charge cycle, minimize current draw from the system and shorten charge time.
Price and Availability
The AAT3691 is qualified across the -40 degrees C to +85 degrees C temperature range. It is available in a 16-pin 3 x 4-mm TDFN package. It sells for $1.12 in 1K quantities.
About AnalogicTech
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. For more information, please visit the AnalogicTech website: www.analogictech.com/. (AnalogicTech - G)
AnalogicTech and the AnalogicTech logo are trademarks of Advanced Analogic Technologies Incorporated. All other brand and product names appearing in this document are registered trademarks or trademarks of their respective holders.
CONTACT: Karolien Cools-Wittry of Advanced Analogic Technologies, Inc., +1-408-737-4600, Karoliencw (at) analogictech.com; or Matthew Quint of +Quint Public Relations, +1-650-599-9450, mquint@quintpr.com, for Advanced Analogic Technologies, Inc.
