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Step-Down Converter with Linear Bypass Powers Multimode PAs in Mobile Handsets

 Step-down converter increases battery life and talk time in mobile handsets.
Step-down converter increases battery life and talk time in mobile handsets.
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Maxim's new DC-DC converter provides a complete power solution for multimode PA modules, allowing designers to extend battery life and talk time in mobile handsets.

SUNNYVALE, CA—February 17, 2011—Maxim Integrated (NASDAQ: MXIM) introduces the MAX8989, a step-down converter designed to power PA (power amplifier) modules in mobile phones. The first DC-DC converter in the industry to support power management for multiple communication protocols (e.g., LTE, WCDMA, GSM, and EDGE), the MAX8989 is ideal for converged (multimode) PAs. This solution is utilized in Infineon's proven SMARTi™ UE2 RF engine platform, which delivers unparalleled flexibility and efficiency to multistandard cellular phone systems.

The MAX8989 integrates a high-efficiency switching regulator with a parallel bypass LDO to guarantee maximum efficiency under all conditions. This approach enables designers to minimize the amount of power dissipated within the PA by regulating the PA's output stage supply voltage. By controlling the PA supply voltage to meet transmission-power requirements, designers can extend 2G talk time by up to 25% and 3G talk time by up to 10%.

The integrated LDO serves to smooth the transition between step-down regulation and operation in dropout, allowing for a seamless transition to higher power levels. When in dropout, the LDO becomes a low-impedance (85mΩ) bypass FET to ensure minimal power loss during periods of peak current demand. Additionally, the switching regulator is capable of a 100% duty cycle to further eliminate losses.

The MAX8989 supports up to 2.5A, making it an excellent choice for powering GSM/EDGE PAs. It is fully specified over the -40°C to +85°C extended temperature range, and offered in a compact (1.6mm × 1.6mm, 0.69mm max height), 9-bump wafer-level package (WLP). Prices start at $1.92 (1000-up, FOB USA). Samples and evaluation kits are available upon request.

About Maxim
Maxim Integrated is a publicly traded company that designs, manufactures, and sells high-performance semiconductor products. The Company was founded over 25 years ago with the mission to deliver innovative analog and mixed-signal engineering solutions that add value to its customers' products. To date, it has developed over 6400 products serving the industrial, communications, consumer, and computing markets.

Maxim reported revenue of approximately $2.0 billion for fiscal 2010. A Fortune 1000 company, Maxim is included in the Nasdaq 100, the Russell 1000, and the MSCI USA indices. For more information, go to www.maximintegrated.com.

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Additional information: MAX8989
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