AnalogicTech AAT2601 Power Management IC Simplifies CDMA Phone Designs

Advanced Analogic Technologies Inc. (AnalogicTech) (Nasdaq: AATI), a developer of power management semiconductors for mobile consumer electronic devices, announced the AAT2601, the company’s first power management IC designed for the specific requirements of mid-tier CDMA handsets. Integrating a single-cell Lithium-ion battery charger, a 300 mA step-down converter, five low dropout (LDO) regulators, a reset function and an I(2)C interface, the latest addition to AnalogicTech’s rapidly expanding Total Power Management IC product family supplies all the power requirements of next-generation CDMA handsets.

“As core currents rise in CDMA chipsets for mid range handset phones, it is essential that designers use more efficient power solutions with dynamic voltage adjustment to maximize system performance,” says Siamak Bastami, product line director for AnalogicTech. “By bringing together a battery charger, a low-noise 300 mA buck converter to power the baseband core, five LDOs for all critical digital, analog, transmit and receive functions, and an I(2)C interface to control voltages dynamically, the AAT2601 allows designers of CDMA handsets, including those targeted at the Chinese market, to optimize performance, reduce footprint and drive down cost.”

Programmable via I(2)C
The battery charger in the AAT2601 is a dynamic device capable of powering the system while charging the battery. This thermally regulated constant current/constant voltage linear charger combines a pass device, reverse blocking protection, high accuracy current and voltage regulation, charge status and charge termination functions. Charging current, charge termination current and recharge voltage are programmable via an external resistor or by a standard I(2)C interface. By using the I(2)C interface to program output voltages, designers can easily optimize system performance.

The 1.8-V step-down converter delivers an output of 300 mA. A 1.5 MHz switching frequency helps minimize the size of supporting external components while keeping switching losses low. Efficiency is greater than 95%. Turn-on time is a fast 120 us typical.

To power noise-sensitive circuits, the AAT2601′s five LDOs offer 60 dB Power Supply Rejection Ration (PSRR) and low noise operation. One of the LDOs outputs 300 mA for digital circuit applications. The other four output 150 mA each.

The AAT2601 also integrates two load switches to support dynamic power path/sleep mode operation.

Total no-load current when the step-down converter and two LDOs are enabled is only 170 uA.

The chip also features both over-current and over-temperature protection.

Price and Availability
The AAT2601 is qualified across the -40 degrees C to +85 degrees C temperature range. It is available in a 36-pin, 0.8-mm high TQFN package. The device sells for $1.81 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.

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