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Chips manage power efficiency in notebooks

Posted: 11 Jun 2007     Print Version  Bookmark and Share

Keywords:DDR  power controllers  MOSFETs  buck controller 

On Semi" ALT="Power controllers from ON Semi" ALIGN="RIGHT">In expansion to its computing product portfolio, ON Semiconductor has introduced three new power controllers designed to meet the efficiency requirements of notebook PCs. The NCP5371, NCP5218 and NCP5215 controllers address the notebook power sub-system 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 sub-systems in notebook computers by up to 5 per cent, thereby extending battery life. The memory and chipset controllers operate with fewer capacitors than existing solutions, enabling physically smaller power management sub-systems 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 sub-system efficiency and fast transient response out of light load operation. The device includes gate drivers that are optimised for large Qg low-side MOSFETs, further improving overall sub-system efficiency.

NCP5218 is a two-in-one power controller, specifically designed as a total solution for notebook DDR memory sub-systems. 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 20µF ceramic output capacitor vs. the 60µF of capacitance required for existing market solutions, thus saving board space and cost. A power saving mode for light load conditions improves sub-system efficiency. The inclusion of VDDQ power good voltage monitoring, VDDQ over-current, over-voltage and under-voltage protection, supply under-voltage monitoring, soft-start and thermal shutdown makes this device a suitable power solution for high current DDR memory sub-systems.

NCP5215 is a dual-channel buck controller, specifically designed for notebook chipsets. A programmable power-saving mode delivers high efficiency of more than 90 per cent 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 per cent vs. existing solutions.

All devices are available now. NCP5371 (Pb-free QFN-48 package) is priced at Rs.136.09 ($3.33) each, NCP5218 (Pb-free DFN-22 package) sells at Rs.46.18 ($1.13) and NCP5215 (Pb-free QFN-40 package) is priced at Rs.46.18 ($1.13) per unit in 2,500 unit quantities.

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