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MAX4208 Datasheet(PDF) 15 Page - Maxim Integrated Products |
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MAX4208 Datasheet(HTML) 15 Page - Maxim Integrated Products |
15 / 17 page Ultra-Low Offset/Drift, Precision Instrumentation Amplifiers with REF Buffer ______________________________________________________________________________________ 15 The ultra-low VOS of the MAX4208/MAX4209 allows full- scale VSENSE of only 10mV to 20mV for minimally inva- sive current sensing using milliohm sense resistors to get high accuracy. Previous methods used the internal resistance of the inductor in the step-down DC-DC con- verter to measure the current, but the accuracy was only 20% to 30%. Using a full-scale VSENSE of 20mV, a 20µV max, VOS error term is less than 0.1% and MAX4209H gain error is 0.25% max at 100x, so the total accuracy is greatly improved. The 0 to 2V output of MAX4209H can be sent to an ADC for calculation. The adjustable gain of MAX4208, can be set to a gain of 250x using 1k Ω and 249kΩ resistors, to scale up a lower 10mV VSENSE voltage to a larger 2.5V output volt- age for wider dynamic range as needed. ASIC IN+ IN- REF VSS VDD REFIN/MODE 1V AT 10A ADC ANTI-ALIASING FILTER 0.002 Ω +VSENSE- MAX4209H OUT +3.3V VSENSE = 10A x 0.002 Ω = 20mV POWER IN RSENSE = 10A x 20mV = 200mW OUT = G x 20mV = 100 x 20mV = 2V Figure 5. MAX4208/MAX4209 Used as Precision Current-Sense Amplifiers for Notebook Computers with VSENSE of 20mV IN- IN+ REFIN/MODE REF FB MAX4208 R4 R3 VDD VSS CFB 5V OUT REF R2 FB R1 G = 1 + R2 R1 BUFFER OUT = VDD/2 VDD/2 Typical Application Circuit |
Similar Part No. - MAX4208_09 |
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Similar Description - MAX4208_09 |
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