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	 > 模擬技術(shù) > 設(shè)計應(yīng)用 > Negative Charge Pumps Achieve
          
    
          

          

          


	
	
	

          
	
          
		
          
			
          Negative Charge Pumps Achieve
          
						
          
				作者：
				時間：2011-04-11
				來源：網(wǎng)絡(luò)
				
				
				
				
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			. A positive-charge-pump architecture switches from its highest efficiency mode (1x) when any single WLED current falls below a predetermined level. Thus, systems with a large number of WLEDs and large forward-voltage mismatch waste a significant amount of power. 

          A negative-charge-pump architecture overcomes the inefficiencies typically encountered in positive-charge-pump designs. Devices such as the MAX8647/MAX8648 use this negative-charge-pump architecture, as well as individual mode switching for each LED, to dramatically improve efficiency and extend battery runtime. These WLED drivers enable designers to achieve inductor-like efficiencies while benefiting from the simplicity and cost savings offered by charge-pump solutions.

          A similar version of this article appeared in Korean in the May 2008 issue of Semiconductor Network. 
                     
				
            
                
			
							
          
                
			            
          
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