Evaluates: MAX44286 MAX44286 Evaluation Kit General Description Quick Start The MAX44286 evaluation kit (EV kit) provides a proven Required Equipment design to evaluate the MAX44286 zero-drift, high-side, The following items are required for operation: current-sense amplifier that offers precision and low MAX44286 EV kit supply current. This EV kit demonstrates the MAX44286 in an ultra-small, 0.78mm x 0.78mm x 0.35mm, 4-bump +3.3V, 1.5A DC power supply wafer-level package (WLP). Electronic load capable of sinking 1A The EV kit PCB comes with a MAX44286FAZS+ installed, (i.e., HP6060B) which is the 50V/V gain version. Other gain options Two digital voltmeters (DVMs) are available. Contact the factory for free samples of the pin-compatible MAX44286TAZS+ (25V/V gain), Procedure MAX44286HAZS+ (100V/V gain), and MAX44286WAZS+ The EV kit is fully assembled and tested. Follow the steps (200V/V gain). below to verify the board operation. Caution: Do not turn on power supply or the electronic load until all EV Kit Contents connections are made. MAX44286 EV Kit Board 1) Connect the positive terminal of the +3.3V supply to the VBATT PCB pad and the negative terminal of the Features and Benefits supply to the GND PCB pad closest to the VBATT PCB Precision Real-Time Current Monitoring pad. +1.8V to +5.5V Input Common-Mode Range 2) Set the electronic load to 1A. Proven PCB Layout 3) Connect the electronic loads positive terminal to RoHS Compliant the LOAD PCB pad and the negative terminal to the nearest GND PCB pad on the EV kit. Ordering Information appears at end of data sheet. 4) Connect the first voltmeter across the RS+ and RS- test points. 5) Connect the second voltmeter across VOUT and the nearest GND PCB pad on the EV kit. 6) Enable the power supply. 7) Enable the electronic load. 8) Verify that the first DVM displays 60mV and the second DVM displays 3.0V. 19-7371 Rev 0 10/14Evaluates: MAX44286 MAX44286 Evaluation Kit Measuring the Load Current Detailed Description of Hardware The load current is measured as a voltage drop (V ) The MAX44286 EV kit provides a proven design to SENSE across an external sense resistor. This voltage is then evaluate the MAX44286 zero-drift, high-side, amplified by the current-sense amplifier and presented current-sense amplifier that offers precision accuracy at its OUT pin. Like all differential amplifiers, the output specifications of V less than 7V (max) and gain error OS voltage has two components of error (an offset error and less than 0.2% (max). a gain error). The offset error affects accuracy at low Applying the V Supply and the Load RS+ currents and a gain error affects accuracy at large The EV kit is installed with a MAX44286FAZS+, which has currentsboth errors affect accuracy at intermediate a 50V/V gain. The current-sense resistor (R ) value currents. By minimizing both offset and gain errors, SENSE is 0.05 with 0.5% tolerance. The V is given by: accuracy can be optimized over a wide dynamic range. OUT V = I x R x A OUT LOAD SENSE V Evaluating Other Gain Versions where A is the gain and I is the current load applied The MAX44286 EV kit can be used to evaluate other V LOAD to the device. Normal operating V and V range is gain versions of the MAX44286 (25V/V, 50V/V, 100V/V, RS+ RS- +1.8V to +5.5V. 200V/V = T, F, H, Z suffix). Replace U1 of the MAX44286 EV kit with the appropriate version of the MAX44286. Maxim Integrated 2 www.maximintegrated.com