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        ME2149
        
                
          
                  
        •     The ME2149 series is a CMOS step-up switching regulator which mainly consists of a reference voltage source, an oscillation circuit, an error amplifier, a phase compensation circuit, a PWM/PFM switching control circuit. With an internal low-ON-resistance Nch Power MOS, this product is applicable to applications requiring high efficiency and high output current. 
          


          
    The ME2149 series switches its operation to the PFM control circuit whose duty ratio is 15 % with to the PWM/PFM switching control circuit under a light load and to prevent decline in the efficiency by IC operation current.
          

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          ME2149 General Description：
          

              The ME2149 series is a CMOS step-up switching regulator which mainly consists of a reference voltage source, an oscillation circuit, an error amplifier, a phase compensation circuit, a PWM/PFM switching control circuit. With an internal low-ON-resistance Nch Power MOS, this product is applicable to applications requiring high efficiency and high output current. 
          

              The ME2149 series switches its operation to the PFM control circuit whose duty ratio is 15 % with to the PWM/PFM switching control circuit under a light load and to prevent decline in the efficiency by IC operation current.
          


          
ME2149 Features：
          

          Low voltage operation: Start-up is guaranteed from 0.9V(IOUT =1 mA )
          

          Duty ratio: Built-in PWM/PFM switching control circuit 15 to 78 % .
          

          oscillator frequency：1.0MHz
          

          Output voltage range：<20V
          

          Feedback voltage accuracy：±2%
          

          Soft start function: 2 mS
          


          
ME2149 Applications：
          

          MP3 players, digital audio players
          

          Digital cameras, GPS, wireless transceiver
          

          Portable devices
          


          
ME2149 Package：
          

          5-pin SOT23-5、SOT89-5
          

          8-pin SOP8
          


          
ME2149 Typical Application Circuit：
          

          

          


          
ME2149 Selection Guide：
          

          

          

          

          
    
        
          
            
            
          product
          
            
          series
          
                      		
            
            
          posfix
          
                      		
            
            
          package
          
                      		
            
            
          switching
          
            
          transistor
          
                      		
            
            
          CE
          
            
          function
          
                      		
            
            
          VDD
          
            
          function
          
                      		
            
            
          FB
          
            
          function
          
                      		
            
            
          features
          
                      		
        
          
        
          
            
            
          ME2149FxxG
          
                      		
            
            
          M5
          
                      		
            
            
          SOT23-5
          
                      		
            
            
          Build in
          
            
          Transistor
          
                      		
            
            
          Yes
          
                      		
            
            
          Yes
          
                      		
            
            
          Yes
          
                      		
            
            
          LX+FB
          
                      		
        
          
        
          
            
            
          P5
          
                      		
            
            
          SOT89-5
          
                      		
        
          
        
          
            
            
          SOP8
          
                      		
            
            
          SOP8
          
                      		
        
          
              

          

           
          
ME2149 Pin Configuration：
          

          

          


          
ME2149 Pin Assignment：
          

          

          


          
ME2149 Block Diagram：
          

          

			
          
		
        
        
        
          
		
           
          
          
          
            
           咨詢：ME2149
          
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