COMPLETE 7-OUTPUT POWER SUPPLY FOR INTEL X-Scale PROCESSOR PDAs AND SMARTPHONES
SUNNYVALE, CA-July 20, 2004-Maxim Integrated Products (NASDAQ: MXIM) introduces the MAX1586A/MAX1586B/MAX1587A, the smallest, most efficient power-management ICs optimized for devices using Intel X-Scale(TM) microprocessors, which include third-generation smart cell phones, PDAs, internet appliances, and other portable devices requiring substantial computing and multimedia capability at low power. The MAX1586/MAX1587 feature ultra-high-performance step-down converters with 1-MHz synchronous rectification that eliminates external diodes, thus saving cost and size.
These ICs integrate seven high-performance, low-operating-current power supplies along with supervisory and management functions. The DC-DC I/O supply can be preset to 3.3V or 3.0V, or adjusted to other values, with currents up to 1.3A. The DRAM supply on the MAX1586A and MAX1587A is preset for 1.8V or 2.5V, while the MAX1586B DRAM supply is preset for 3.3V or 2.5V, providing up to 900mA. The DRAM supply on all parts can also be adjusted with external resistors. The CPU core supply is serially programmed for dynamic voltage management and delivers 500mA. Linear-regulated outputs are provided for SRAM, PLL, and USIM supplies.
To minimize sleep-state quiescent current, I/O and DRAM supplies have bypass "sleep" LDOs. These LDOs can be activated to minimize battery drain when output current is very low, thus achieving a quiescent current of only 60 microamps. In addition, all DC-DC outputs operate with fixed-frequency PWM control and automatically switch from PWM to skip-mode operation at light loads to extend battery life. Other functions include separate on/off control for all DC-DC converters, low-battery and dead-battery detection, reset and power-OK outputs, and a backup battery input.
A 2.6V to 5.5V input-voltage range allows the use of a 1-cell lithium-ion (Li+), 3-cell NiMH, or a regulated 5V input. The MAX1586A/MAX1586B features an additional linear regulator (V6) for VCC_USIM and low-battery and dead-battery comparators. The MAX1587A is available in the smaller 6mm x 6mm, 40-pin thin QFN package, while the MAX1586 is available in a 7mm x 7mm, 48-pin thin QFN package. The parts are screened for the extended temperature range (-40 degrees Celsius to +85 degrees Celsius). Prices start at $ 5.80 (1000-up, FOB USA). An evaluation kit is available to speed designs.
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