Evaluates: MAX9634 19-5174 Rev 0 3/10 MAX9634 Evaluation Kit General Description Features The MAX9634 evaluation kit (EV kit) provides a proven S Precision Real-Time Current Monitoring design to evaluate the MAX9634 high-side current-sense S 1.6V to 28V Input Common-Mode Range amplifier, which offers precision accuracy specifications S Proven PCB Layout of V less than 250V (max) and gain error less than OS S Fully Assembled and Tested 0.5% (max). This EV kit demonstrates the MAX9634 in a tiny 1mm x 1mm x 0.6mm, 4-bump UCSP package. The MAX9634 is also available in a 5-pin SOT23, but that package is not compatible with this EV kit. The EV kit PCB comes with a MAX9634FERS+ installed, Ordering Information which is the 50V/V gain version. Contact the factory for PART TYPE free samples of the pin-compatible MAX9634TERS+, MAX9634EVKIT+ EV Kit MAX9634HERS+, and MAX9634WERS+, which are 25V/V, 100V/V, and 200V/V gain versions, respectively. +Denotes lead(Pb)-free and RoHS compliant. Component List DESIGNATION QTY DESCRIPTION 1FF Q10%, 50V X7R ceramic C1 1 capacitor (1206) Murata GRM31MR71H105KA Not installed, ceramic capacitor C2 0 (0603) 0.05I Q0.5%, 0.5W 4-terminal R1 1 current-sense resistor (1206) Ohmite LVK12R050DER TP1, TP2 2 Test points Precision current-sense amplifier (4 UCSP) U1 1 Maxim MAX9634FERS+ (Gain: 50V/V) (Top Mark: +ABY) PCB: MAX9634 EVALUATION 1 KIT+ Component Suppliers SUPPLIER PHONE WEBSITE Murata Electronics North America Inc. 770-436-1300 www.murata-northamerica.com Ohmite Mfg. Co. 866-964-6483 www.ohmite.com Note: Indicate that you are using the MAX9634 when contacting these component suppliers. UCSP is a trademark of Maxim Integrated Products, Inc. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.MAX9634 Evaluation Kit Quick Start Detailed Description of Hardware The MAX9634 EV kit provides a proven design to evalu- Recommended Equipment ate the MAX9634 high-side current-sense amplifier, MAX9634 EV kit which offers precision accuracy specifications of V OS 3.6V, 1A DC power supply less than 250V (max) and gain error less than 0.5% An electronic load capable of sinking 800mA (max). (e.g., HP 6060B) Applying the VRS+ Supply and the Load Two digital voltmeters The EV kit is installed with a MAX9634FERS+, which has a gain of 50V/V. The current-sense resistor (R ) Procedure SENSE value is 0.05I with Q0.5% tolerance. The voltage at the The MAX9634 EV kit is fully assembled and tested. Follow VOUT pad is given by: the steps below to verify board operation. Caution: Do not turn on the power supply or electronic load until all connections are completed. V = (I R + V ) A OUT LOAD SENSE OS V 1) Connect the positive terminal of the 3.6V supply to where V is the offset, A is the gain, and I is the OS V LOAD the VBATT pad and the negative terminal of the sup- current load applied to the device. Normal operating ply to the GND pad closest to the VBATT pad. V and V range is 1.6V to 28V. RS+ RS- 2) Set the electronic load to sink 800mA. Measuring the Load Current 3) Connect the electronic loads positive terminal to the The load current is measured as a voltage drop (V ) SENSE LOAD pad and the negative terminal to the GND pad across an external sense resistor. This voltage is then closest to the bottom of the EV kit. amplified by the current-sense amplifier and presented 4) Connect the first voltmeter across test points TP1 and at the VOUT pad. Like all differential amplifiers, the TP2 to measure V . output voltage has two components of error (an offset SENSE error and a gain error). The offset error affects accuracy 5) Connect the second voltmeter across the VOUT pad at low currents and the gain error affects accuracy at and the closest GND pad. large currentsboth errors affect accuracy at intermedi- 6) Turn on the power supply. ate currents. By minimizing both offset and gain errors, 7) Turn on the electronic load. accuracy is optimized over a wide dynamic range. 8) Verify that the first voltmeter reading is approximately Evaluating Other Gain Versions 40mV and the second voltmeter is approximately 2V. The MAX9634 EV kit can also be used to evaluate other 9) Adjust the current load from 800mA to 0A and verify gain versions of the MAX9634 (25V/V, 100V/V, or 200V/V that the reading of the second voltmeter is approxi- with a T, H, or W suffix, respectively). Replace U1 on the EV mately 50 times the reading of the first voltmeter. kit with a different version of the MAX9634 IC. Note: If the voltmeter has a 10M input resistance, the output voltage reads 0.1% low. 2 Evaluates: MAX9634