Analog Devices ADP1707 Evaluation Board ADP1707-3.3-EVALZ ADP1707-3.3-EVALZ Datenbogen

 

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Figure 11 shows how the evaluation board can be connected to 
a voltage source and an ammeter for ground current measure-
ments. A resistor can be used as the load for the regulator. 
Ensure that the resistor has a power rating adequate to handle 
the power expected to be dissipated across it. An electronic load 
can be used as an alternative. Ensure that the voltage source 
used can supply enough current for the expected load levels. 

Follow these steps to connect to a voltage source and ammeter: 

1.  Connect the positive terminal (+) of the voltage source to 

the VIN pad on the evaluation board.  

2.  Connect the positive terminal (+) of the ammeter to one of 

the GND pads of the evaluation board.  

3.  Connect the negative terminal (−) of the ammeter to the 

negative (−) terminal of the voltage source.  

4.  Connect a load between the VOUT pad of the evaluation 

board and the negative (−) terminal of the voltage source.  

5.  The voltage source can now be turned on. If J1 is inserted 

(this connects EN to VIN for automatic startup), then the 
regulator powers up.  

Ground current measurements are a way of determining how 
much current the regulator’s internal circuits are consuming 
while performing the regulation function. To be efficient,  
the regulator needs to consume as little current as possible. 

Typically, the regulator uses the maximum current when 
supplying its largest load level (1 A). Figure 12 shows the  
typical ground current consumption for various load levels  
at VIN = 3.8 V. 

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When the device is disabled (EN = GND), ground current 
drops to less than 1 μA. 

Note that larger ground current levels occur when using an 
evaluation board with R1 and R2 present.