Evaluates: MAX9928/MAX9929/MAX4372 19-4397 Rev 0 12/08 MAX9928 Evaluation Kit General Description Features The MAX9928 evaluation kit (EV kit) provides a proven Precision Real-Time Current Monitoring design to evaluate the MAX9928 uni-/bidirectional, high- -0.1V to +28V Input Common-Mode Range side, current-sense amplifier, which offers precision accu- racy specifications of V < 400V and gain error OS Evaluates MAX9928, MAX9929, and MAX4372 < 1.0%. This EV kit demonstrates the MAX9928 in an ultra- V < 0.4mV Gain Error < 1% OS small, 1mm x 1.5mm x 0.6mm, 6-bump UCSP package. The MAX9928 is also available in an 8-pin MAX , but SIGN Bit to Show Charge/Discharge Current Flow that package is not compatible with this EV kit. Lead(Pb)-Free and RoHS Compliant The MAX9928 EV kit PCB comes with a MAX9928FABT+ Proven PCB Layout installed, which is the 5A/mV gain version. The MAX9928 EV kit can also be used to evaluate the Fully Assembled and Tested MAX9928T, MAX9929F, and MAX9929T (2A/mV, 50V/V, and 20V/V, respectively). This EV kit can also evaluate the MAX4372 in a footprint-compatible UCSP package. Ordering Information Contact the factory for free samples of the pin-compatible PART TYPE MAX9928TABT+, MAX9929FABT+, or MAX9929TABT+ devices. MAX9928EVKIT+ EV Kit +Denotes lead(Pb)-free and RoHS compliant. Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION 0.1 1%, 1/2W sensing resistor CIN, COUT 0 Not installed, capacitors (0603) RSENSE 1 (1206) 0.1F 10%, 50V X7R ceramic Vishay/Dale WSL1206R1000FEB18 C3 1 capacitor (0603) Not installed, resistorsshort Murata GRM188R71H104K RIN1, RIN2 0 1F 10%, 50V X5S ceramic ROUT 1 10k 1% resistor (0603) C4 1 capacitor (0603) Precision current-sense amplifier Taiyo Yuden UMK107C5105KA U1 1 (6 UCSP) Maxim MAX9928FABT+ 1 PCB: MAX9928 Evaluation Kit+ Component Suppliers SUPPLIER PHONE WEBSITE Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com Taiyo Yuden 800-348-2496 www.t-yuden.com Vishay 402-563-6866 www.vishay.com Note: Indicate that you are using the MAX9928 when contacting these component suppliers. UCSP is a trademark and MAX is a registered 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.MAX9928 Evaluation Kit Quick Start Detailed Description of Hardware The MAX9928 evaluation kit (EV kit) provides a proven Recommended Equipment design to evaluate the MAX9928 uni-/bidirectional, Before beginning, the following equipment is needed: high-side, current-sense amplifier, which offers preci- MAX9928 EV kit sion accuracy specifications of V < 400V and gain OS 5V/10mA DC power supply error < 1.0%. 12V/1A DC power supply Output Voltage Calculation An electronic load capable of sinking 800mA (e.g., The MAX9928 EV kit is installed with a MAX9928FABT+, HP 6060B) which has a gain of 5A/mV. The current-sense resistor (R ) value is 0.1 with 1% tolerance. The V is SENSE OUT Two digital voltmeters given by: Procedure V =I x R x G x R OUT LOAD SENSE m OUT The MAX9928 EV kit is fully assembled and tested. where G is the gain and I is the current load m LOAD Follow the steps below to verify board operation. applied to the device. Vary R to change the effec- OUT Caution: Do not turn on the power supply or the tive voltage gain. electronic load until all connections are completed. 1) Connect the positive terminal of the 5V supply to Applying V and V Supply Voltages CC RS+ the VCC pad. Connect the negative terminal of the The normal operating range for V is 2.5V to 5.5V for CC 5V supply to the GND pad. MAX9928/MAX9929. The normal operating range for V is 2.7V to 28V for MAX4372. CC 2) Connect the positive terminal of the 12V supply to the RS+ pad. Connect the negative terminal of the The normal input common-mode range at VRS+ and 12V supply to the GND pad. VRS- is -0.1V to +28V for MAX9928/MAX9929. The MAX4372 operates with an input range of 0V to 28V, 3) Set the electronic load to sink 500mA. but the total OUT error at 0V can be up to 28%. 4) Connect the electronic loads positive terminal to the RS- pad and the negative terminal to the GND Measuring the Load Current pad. The load current is measured as a voltage drop (V ) across an external sense resistor. This volt- SENSE 5) Connect the first voltmeter across the OUT and the age is then amplified by the current-sense amplifier GND pads. and presented as a current at its output pin and con- 6) Connect the second voltmeter across the SIGN and verted to a voltage by R . Like all differential ampli- OUT the GND pads. fiers, the output voltage has two components of error: 7) Turn on the power supplies. an offset error and a gain error. The offset error affects accuracy at small V and a gain error affects SENSE 8) Turn on the electronic load. accuracy at large V . By minimizing both offset SENSE 9) Verify that the OUT voltmeter reading is approximate- and gain errors, accuracy can be optimized over a ly 2.5V and the SIGN voltmeter is approximately 5V. wide dynamic range. Take care not to load the internal 1M pullup resistor on the SIGN pin when measuring this voltage. 2 Evaluates: MAX9928/MAX9929/MAX4372