Six-Output, Smartphone Power-Management ICs Reduce Footprint by 72% and Simplify MSM™/OMAP™/Samsung Processor-Based Smartphones
SUNNYVALE, CA-March 16, 2005-Maxim Integrated Products (NASDAQ: MXIM) introduces the MAX8621Y/MAX8621Z power management integrated circuits (PMICs). They are optimized for portables which require multiple supply voltages, demand high efficiency, and are small.
The MAX8621Y/MAX8621Z consist of two high-performance 4MHz step-down DC-DCs, four low-dropout linear regulators, a reset timer, and an open-drain driver in a 16mm(2) TQFN package. Using seven discrete SOT23 components to perform this function would take 75mm(2) of board space. The step-down DC-DC converter outputs are sequenced to ensure proper microprocessor startup and the LDOs have individual on/off control for complete flexibility. These devices can therefore directly replace discrete solutions without requiring software to be rewritten. The MAX8621Y/MAX8621Z provide different combinations of LDO output voltages.
The synchronous step-down converters provide up to 92% efficiency and allow use of a tiny 1 microhenrie inductor. The four LDOs provide low-noise 45 microvolts root-mean-square output and are pin-programmable to save space and maintain flexibility. Two LDOs supply 300mA (OUT1 and OUT2) and the other two supply 150mA (OUT3 and OUT4). The 60ms reset timer monitors OUT1 and warns the system of impending power loss, thereby allowing a safe shutdown. To alter output voltage for sleep-mode operation, the driver output controls LED backlighting or provides an open-drain connection to adjust the resistance in the feedback network of a step-down converter.
The MAX8621Y/MAX8621Z are available in a space-saving 24-pin, 4mm x 4mm TQFN package, screened for the extended industrial temperature range (-40 degrees Celsius to +85 degrees Celsius). Prices start at $3.70 (1000-up, FOB USA). The MAX8621EVKIT (evaluation kit) is available to speed designs.
MSM is a trademark of Qualcomm.
OMAP is a trademark of Texas Instruments.
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