MAX44285EVKIT#

Evaluates: MAX44285 MAX44285 Evaluation Kit General Description The MAX44285 evaluation kit (EV kit) provides a proven design to evaluate the MAX44285 dual-channel, highprecision, high-voltage, current-sense amplifier. This EV kit demonstrates the MAX44285 in an ultra-small, 1mm x 2mm, 8-bump WLP package. The EV kit PCB comes with a MAX44285TAWA+ installed, which is the 20V/V gain version. Other gain options are available. Contact the factory for the pin-compatible MAX44285LAWA+ (G = 12.5V/V), MAX44285FAWA+ (G = 50V/V), and MAX44285HAWA+ (G = 100V/V). EV Kit Contents ●● MAX44285 EV Kit Board Features and Benefits ●● Precision Real-Time Current Monitoring ●● +2.7V to +76V Input Common-Mode Range ●● Proven PCB Layout ●● Fully Assembled and Tested Ordering Information appears at end of data sheet. Quick Start Required Equipment The following items are required for operation: • MAX44285 EV kit • +3.3V, 1A DC power supply • +5V, 3A DC power supply • An electronic load capable of sinking 3A (i.e., HP6060B) • Two digital voltmeters Procedure The MAX44285 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 VDD test point and the negative terminal of the supply to the nearest GND test point. 2) Connect the positive terminal of the +5V supply to the VSENSE+ test point and the negative terminal of the supply to the nearest GND test point. 3) Set the electronic load to sink 2.5A. 4) Connect the positive terminal of the electronic load to the VSENSE- test point and the negative terminal of the supply to the nearest GND test point. 5) Connect the first voltmeter between test points RS1+ and RS1- to measure VSENSE1. 6) Connect the second voltmeter between VOUT1 and the nearest GND test points. 7) Turn on the power supplies. 8) Enable the electronic load. 9) Verify that the first voltmeter displays 125mV and the second voltmeter displays 2.5V. 10) Repeat the steps for the second current sense amplifier using the VSENSE2+ and VSENSE2- test points as the inputs and VOUT2 test point as the output. 19-7021; Rev 0; 7/14 Evaluates: MAX44285 MAX44285 Evaluation Kit Detailed Description of Hardware The MAX44285 EV kit provides a proven design to evaluate the MAX44285 high-side, dual-channel, current-sense amplifier, which offers precision accuracy specifications of input offset voltage (VOS) less than 10µV (max) and gain error less than 0.1% (max). Applying the VRS+ Supply and the Load The EV kit is installed with a MAX44285TAWA+, which has a 20V/V gain. The current-sense resistors (RSENSE) value is 0.05Ω with ±0.5% tolerance. The VOUT for each channel given by: 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 VOUT_ 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. 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 2.7V to 76V. Component List DESIGNATION QTY C1 1 C2 C3–C8 DESIGNATION QTY 0.1µF ±10%, 16V SMT ceramic capacitor (0603) RS1+, RS1-, RS2+, RS2- 4 Test points 1 4.7µF ±10%, 16V SMT ceramic capacitor (0805) U1 1 6 1000pF ±10%, 50V SMT ceramic capacitors (1206) Dual-channel, current-sense amplifier (8 WLP) Maxim MAX44285TAWA+ C9, C10 2 180pF ±10%, 50V SMT ceramic capacitors (0603) GND, TP1–TP4 5 Test points 7 Red test points (1.80mm) R1, R2 2 0.05Ω ±0.5%, 0.5W resistors (1206) VDD, VOUT1, VOUT2, VSENSE1+ ,VSENSE1, VSENSE2+, VSENSE2- R3–R8 6 0Ω 0%, 0.10W resistors (0603) — — PCB: MAX44285 EVKIT www.maximintegrated.com DESCRIPTION DESCRIPTION Maxim Integrated │  2 MAX44285 Evaluation Kit Evaluates: MAX44285 Figure 1. MAX44285 EV Kit Schematic www.maximintegrated.com Maxim Integrated │  3 Evaluates: MAX44285 MAX44285 Evaluation Kit VDD GND C10 C3 R7 R8 C7 C2 C1 A1 RS1- U1 C5 C4 VOUT2 GND RS2+ RS2- MAX44285 EVKIT C8 VOUT1 RS1+ C6 GND C9 GND 1-408-601-1000 www.maximintegrated.com R3 R4 VSENSE1+ R1 R5 R6 VSENSE1VSENSE2+ R2 VSENSE2GND P/N EPCB44285 REV-A 03/14 KT 1” 1" Figure 2. MAX44285 EV Kit Component Placement Guide— Component Side Figure 3. MAX44285 EV Kit PCB Layout—Component Side 1” Figure 4. MAX44285 EV Kit PCB Layout—Solder Side www.maximintegrated.com Maxim Integrated │  4 MAX44285 Evaluation Kit Evaluates: MAX44285 Ordering Information PART TYPE MAX44285EVKIT# EV Kit #RoHS-compliant. www.maximintegrated.com Maxim Integrated │  5 Evaluates: MAX44285 MAX44285 Evaluation Kit Revision History REVISION NUMBER REVISION DATE 0 7/14 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. © 2013 Maxim Integrated Products, Inc. │  6