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	 > 電源與新能源 > 新品快遞 > Linear Technology Corporation introduces the LTC4054
          
    
          

          

          


	
	
	

          
	
          
		
          
			
          Linear Technology Corporation introduces the LTC4054
          
						
          
				作者：電子設(shè)計應(yīng)用
				時間：2003-03-17
				來源：電子設(shè)計應(yīng)用

				
				
				
				
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			Linear Technology Corporation introduces the LTC4054, a single-cell linear Li-Ion battery charger with on-board charge termination circuitry and power transistor housed in a 5-lead 1mm high SOT-23 (ThinSOT?) package. The LTC4054 can deliver up to 800mA charge current in the tiny package without requiring an external transistor. Alternative solutions with an integrated transistor are housed in a package twice the size of the LTC4054. Moreover, other linear charger controllers in a SOT-23 package depend on an external transistor to deliver the same amount of current as the LTC4054. In addition to an integrated transistor, the LTC4054 requires no sense resistor, blocking diode or charge termination control circuit allowing a complete design to fit in just 18mm? board area with 1mm height. 

          To eliminate the risk of overheating, the LTC4054 incorporates thermal feedback regulation by automatically controlling the charge current to limit the die temperature during high power operation or high ambient temperature. The LTC4054 keeps the battery 揻resh?after charge termination by monitoring the battery抯 voltage and automatically recharging it if the voltage drops below a set threshold. Because of its standalone operation, compact solution and low 4.25V input supply operation, the LTC4054 is an ideal solution for charging a Li-Ion battery from the USB port in handhelds as well as Bluetooth?headsets, portable MP3 players, battery powered GPS devices, PDAs and cell phones. 
          

          The LTC4054 is a linear charger for single-cell 4.2V Li-ion and Li-Polymer batteries. The IC charges the battery in constant-current/constant-voltage mode and terminates charging after detecting C/10. The termination event is indicated by a Charge Status pin, which can signal a microcontroller or drive an LED. The user sets the charge current with a resistor. The float voltage is preset at 4.2V with 
				
            
          
                
			
							
          
                
			              
              
            
          
		
          
		
          
		
          
		
          
		
          
			
            
				
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          關(guān)鍵詞：
            			            Linear
                        
            
          
            
			
          
		
          	
		

	

          
	
	
          
		
          
			
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