MAX44286EVKIT#

Evaluates: MAX44286 MAX44286 Evaluation Kit General Description The MAX44286 evaluation kit (EV kit) provides a proven design to evaluate the MAX44286 zero-drift, high-side, current-sense amplifier that offers precision and low supply current. This EV kit demonstrates the MAX44286 in an ultra-small, 0.78mm x 0.78mm x 0.35mm, 4-bump wafer-level package (WLP). The EV kit PCB comes with a MAX44286FAZS+ installed, which is the 50V/V gain version. Other gain options are available. Contact the factory for free samples of the pin-compatible MAX44286TAZS+ (25V/V gain), MAX44286HAZS+ (100V/V gain), and MAX44286WAZS+ (200V/V gain). EV Kit Contents ●● MAX44286 EV Kit Board Features and Benefits ●● Precision Real-Time Current Monitoring ●● +1.8V to +5.5V Input Common-Mode Range ●● Proven PCB Layout ●● RoHS Compliant Ordering Information appears at end of data sheet. Quick Start Required Equipment The following items are required for operation: • MAX44286 EV kit • +3.3V, 1.5A DC power supply • Electronic load capable of sinking 1A (i.e., HP6060B) • Two digital voltmeters (DVMs) Procedure The EV kit is fully assembled and tested. Follow the steps below to verify the board operation. Caution: Do not turn on power supply or the electronic load until all connections are made. 1) Connect the positive terminal of the +3.3V supply to the VBATT PCB pad and the negative terminal of the supply to the GND PCB pad closest to the VBATT PCB pad. 2) Set the electronic load to 1A. 3) Connect the electronic load’s positive terminal to the LOAD PCB pad and the negative terminal to the nearest GND PCB pad on the EV kit. 4) Connect the first voltmeter across the RS+ and RStest 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; 10/14 MAX44286 Evaluation Kit Detailed Description of Hardware The MAX44286 EV kit provides a proven design to evaluate the MAX44286 zero-drift, high-side, current-sense amplifier that offers precision accuracy specifications of VOS less than 7µV (max) and gain error less than 0.2% (max). Applying the VRS+ Supply and the Load The EV kit is installed with a MAX44286FAZS+, which has a 50V/V gain. The current-sense resistor (RSENSE) value is 0.05Ω with ±0.5% tolerance. The VOUT is given by: VOUT = ILOAD x RSENSE x AV where AV is the gain and ILOAD is the current load applied to the device. Normal operating VRS+ and VRS- range is +1.8V to +5.5V. www.maximintegrated.com Evaluates: MAX44286 Measuring the Load Current The load current is measured as a voltage drop (VSENSE) across an external sense resistor. This voltage is then amplified by the current-sense amplifier and presented at its OUT pin. Like all differential amplifiers, the output voltage has two components of error (an offset error and a gain error). The offset error affects accuracy at low currents and a gain error affects accuracy at large currents—both errors affect accuracy at intermediate currents. By minimizing both offset and gain errors, accuracy can be optimized over a wide dynamic range. Evaluating Other Gain Versions The MAX44286 EV kit can be used to evaluate other gain versions of the MAX44286 (25V/V, 50V/V, 100V/V, 200V/V = T, F, H, Z suffix). Replace U1 of the MAX44286 EV kit with the appropriate version of the MAX44286. Maxim Integrated │  2 Evaluates: MAX44286 MAX44286 Evaluation Kit Component List Refer to file “evkit_build_bom_max44286_evkit_a.csv” attached to this PDF for component information. VBATT GND LOAD C1 1UF 2 1 GND R1 V I V2 I2 3 4 0.05 0.5% RS+ GND A1 B1 U1 MAX44286 RS+ RS- GND OUT A2 RS- VOUT B2 C2 OPEN Figure 1. MAX44286 EV Kit Schematic www.maximintegrated.com Maxim Integrated │  3 Evaluates: MAX44286 MAX44286 Evaluation Kit 1” Figure 2. MAX44286 EV Kit Component Placement Guide— Component Side Figure 3. MAX44286 EV Kit PCB Layout—Component Side 1” Figure 4. MAX44286 EV Kit PCB Layout—Solder Side www.maximintegrated.com Maxim Integrated │  4 MAX44286 Evaluation Kit Evaluates: MAX44286 Ordering Information PART TYPE MAX44286EVKIT# EV Kit #RoHS compliant. www.maximintegrated.com Maxim Integrated │  5 Evaluates: MAX44286 MAX44286 Evaluation Kit Revision History REVISION NUMBER REVISION DATE 0 10/14 DESCRIPTION Initial release PAGES CHANGED — For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com. Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. © 2014 Maxim Integrated Products, Inc. │  6