In the UCD7242 electrical specifications table on sheet 4 (& the Imon section on sheet 16), the current sense amplifier gain is defined with a min-max range of 19 - 21 uA/A for all load currents > ΔI/2. However, this is not what I measured on the eval board PMP6730B. I modified the output L-C filter and the switch frequency to provide 1.8V output from a 5.5V input while switching at 750kHz. My current probe in series with the output inductor measured a ΔI/2 = 288mA. I have a 6.65 kohm resistor from Imon to GND. In the list below, I show what I measured (both on a scope & a DMM) on the Imon pin. You can see that I measure amplifer gains that are significantly above the acceptable range in the datasheet. Did I make a mistake in how I measured this, or is the datasheet incorrect about the tolerance of the amplifier gain?
Load I Imon V Amp Gain
0.50A 108mV 32.50 uA/A
0.75A 133mV 26.67 uA/A
1.00A 158mV 23.76 uA/A
1.50A 217mV 21.75 uA/A
2.80A 380mV 20.41 uA/A