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ADP160 Production
The ADP160 / ADP161 / ADP162 / ADP163 are ultralow quiescent current, low dropout, linear regulators that operate from 2.2 V to 5.5 V and provide up to...
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ADP160 on Analog.com

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how do i decrease Iq with adp160

		
	
				

			

									
					    Michael-C-L
					
							

            
            			
				
									
											
			
			
				
			
			
			    	
			                    
                
				                on Aug 30, 2013 
				
			
			
		

		
		                     
				
        		

		    
		    		    
		    			

			    
Hello Sir,

 
i have designed a power supply circuit based on ADP160AUJZ-3.0, the circuit diagram is below

 

 
PWR_BATT is Vin = 4.5V

 
PWR_RTC is Vout = 3.0V

 
The result is:

 
1. when load current is 3uA, Iq = 87uA

 
2. when no load on output port, Iq > 80uA

 
3. if  i  cut pin 3 from Vin, and connected  to gnd, Iq < 1uA

 
So i think there must be something wrong with my design. because Iq is more great than spec..

 
Please help me, thank you.

			

			
									
		                             
                        

    

                                            
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							FormerMember
					
    
		
    
		    
		    		    
			
				
									FormerMember
							        
			
			
			
            
						
                            
            
            				
            
                on Aug 30, 2013 4:54 PM
            
            
						
			            		
    
		
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    Michael,
    
 
    it would be necessary to know how you measure the currents.
    
 
    Can you draw a picture of how you connect all your instruments when you measure 3uA on the load and 87uA on the input?
    
 
    Are you sure you measurement equipment is not drawing that additional 80uA?
    
 
    80uA at 3.3V output is equivalent to a 41Kohm resitance, that seems like a lot of load but are you sure your DMM is really high impedance?
    
 
    LucaV
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
				
				
				
		
		
    
			
		
    
	
    

    

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							FormerMember
					
    
		
    
		    
		    		    
			
				
									FormerMember
							        
			
			
			
            
						
                            
            
            				
            
                on Aug 30, 2013 4:54 PM
            
            
						
			            		
    
		
										0
					
	
    

		
		
    
		
    
                                
                                                            
    
					
    Michael,
    
 
    it would be necessary to know how you measure the currents.
    
 
    Can you draw a picture of how you connect all your instruments when you measure 3uA on the load and 87uA on the input?
    
 
    Are you sure you measurement equipment is not drawing that additional 80uA?
    
 
    80uA at 3.3V output is equivalent to a 41Kohm resitance, that seems like a lot of load but are you sure your DMM is really high impedance?
    
 
    LucaV
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
				
				
				
		
		
    
			
		
    
	
    

    

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