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Chips address power management in laptops

Posted: 11 Jun 2007 ?? ?Print Version ?Bookmark and Share

Keywords:DDR? power controllers? MOSFETs? buck controller?

Power controllers from <a href=On Semi" ALIGN="RIGHT">

ON Semiconductor has expanded its computing product portfolio with the introduction of three new power controllers designed to meet the efficiency requirements of notebook PCs. The NCP5371, NCP5218 and NCP5215 controllers address the notebook power subsystem needs for Vcore, DDR memory and CPU chipsets respectively.

The new devices join ON Semiconductor's recently introduced NCP5387 and NCP5382 dual-edge Vcore control solutions designed to enable more efficient and more compact power solutions for computing applications.

Multiple solutions
Featuring a variety of power-saving features, the new controllers improve the efficiency of power management subsystems in notebook computers by up to 5 percent, thereby extending battery life. The memory and chipset controllers operate with fewer capacitors than existing solutions, enabling physically smaller power management subsystems and leaving more circuit board real estate available for other functions.

NCP5371 is a two-phase, dual-edge Vcore controller, specifically designed to support notebook mobile processor power delivery requirements. The current-mode variable frequency architecture provides ultrafast dynamic response with virtually no overshoot for dynamic loads and dynamic VID changes. Automatic variable frequency operation during light load conditions provides high subsystem efficiency and fast transient response out of light load operation. The device includes gate drivers that are optimized for large Qg low-side MOSFETs, further improving overall subsystem efficiency.

NCP5218 is a two-in-one power controller, specifically designed as a total solution for notebook DDR memory subsystems. This device combines the efficiency of a PWM controller for the VDDQ supply, with the simplicity of a linear regulator for the VTT supply. The high bandwidth VTT regulator requires only a 20?F ceramic output capacitor vs. the 60?F of capacitance required for existing market solutions, thus saving board space and cost. A power saving mode for light load conditions improves subsystem efficiency. The inclusion of VDDQ power good voltage monitoring, VDDQ overcurrent, overvoltage and undervoltage protection, supply undervoltage monitoring, soft-start and thermal shutdown makes this device a suitable power solution for high current DDR memory subsystems.

NCP5215 is a dual-channel buck controller, specifically designed for notebook chipsets. A programmable power-saving mode delivers high efficiency of more than 90 percent over the entire load range. The 180 interleaved operation reduces input capacitance requirements, while the programmable adaptive voltage position reduces output capacitance requirements, combining to reduce board space for capacitors by 25 percent vs. existing solutions.

All devices are available now. NCP5371 (Pb-free QFN-48 package) is priced at $3.33 each, NCP5218 (Pb-free DFN-22 package) sells at $1.13 and NCP5215 (Pb-free QFN-40 package) is priced at $1.13 per unit in 2,500 unit quantities.




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