Evaluates: MAX16903/MAX16904 19-5483 Rev 0 10/10 MAX16903 Evaluation Kit General Description Features The MAX16903 evaluation kit (EV kit) provides a proven S Up to +42V Input Supply Range design to evaluate the MAX16903 2.1MHz high-voltage S Delivers Up to 1A Output Current mini-buck converter in a 16-pin TSSOP package. All S Proven PCB Layout components are rated for the automotive temperature S Fully Assembled and Tested range. Various test points are included for evaluation. The EV kit PCB comes with a MAX16903RAUE50/V+ installed. The EV kit outputs a fixed +5V. The fixed +3.3V output version can also be installed with mini- Ordering Information mal component changes. Contact the factory for free PART TYPE samples of the pin-compatible MAX16903SAUE50/V+, MAX16903EVKIT+ EV Kit MAX16903SAUE33/V+, and MAX16903RAUE33/V+ to evaluate these devices. +Denotes lead(Pb)-free and RoHS compliant. Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION 4.7FH, 2.0A power inductor 4.7FF Q10%, 50V X7R ceramic L1 1 TDK LTF5022T-4R7N2R0 C1 1 capacitor (1206) Murata GRM31CR71H475K R1, R2 0 Not installed, resistors (0603) R4 1 3kI Q5% resistor (0603) 0.1FF Q10%, 16V C ceramic C4 1 capacitor (0402) TP2, TP9, TP10, 4 Black multipurpose test points TDK C1005X7R1C104K TP11 TP3, TP4 2 Red multipurpose test points 10FF Q20%, 25V X7R ceramic C5 1 capacitor (1210) TP5, TP6 2 Red miniature test points TDK C3225X7R1E106M Not installed, miniature test TP8 0 point 2.2FF Q20%, 16V X7R ceramic C6 1 capacitor (0805) 2.1MHz mini-buck converter TDK C2012X7R1C225K U1 1 (16 TSSOP-EP*) Maxim MAX16903RAUE50/V+ Not installed, ceramic capacitor C8 0 (0603) 3 Shunts D2 1 Green LED (0603) PCB: MAX16903 EVALUATION 1 KIT+ JU1, JU2 2 3-pin headers JU3 1 2-pin header *EP = Exposed pad. /V denotes an automotive qualified part. Component Suppliers SUPPLIER PHONE WEBSITE Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com TDK Corp. 847-803-6100 www.component.tdk.com Note: Indicate that you are using the MAX16903 when contacting these component suppliers. 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.MAX16903 Evaluation Kit Quick Start Detailed Description of Hardware The MAX16903 EV kit provides a proven layout for the Required Equipment MAX16903 2.1MHz synchronous buck regulator. The MAX16903 EV kit device accepts input voltages as high as +28V and +12V, 1A DC power supply (PS1) delivers up to 1A at +5V. The EV kit can handle an input- Electronic load or equivalent resistor load supply transient up to +42V. Various test points are included for evaluation. Two digital multimeters (DMMs) SYNC Procedure The device can operate in two modes, forced PWM or The EV kit is fully assembled and tested. Follow the steps skip mode. For light-load conditions, skip mode has below to verify board operation: better efficiency. When SYNC is pulled low, the device 1) Verify that the jumpers are in their default position, as operates in skip mode for light loads and PWM mode shown in Table 1. for larger loads. By applying a high level on SYNC, 2) Connect the positive terminal of the +12V supply to the device is forced to do PWM even under light-load VSUP (TP3) and the negative terminal to PGND (TP2). conditions. 3) Set DMM1 to measure voltage and connect the SYNC can also be used to synchronize with other positive terminal to VOUT (TP4). Connect the negative supplies if a clock source is present. The device forces terminal to PGND (TP11). PWM when a clock source is present based on the input clock. 4) Set the power supply to 1A current limit. Turn on the power supply. Evaluating the +3.3V Version 5) With jumper JU3 shorted, the green LED should light The device is available in fixed +5V and +3.3V outputs. up. DMM1 should display an output voltage of +5V. The EV kit comes installed with the +5V output version. The +3.3V output part can be swapped with the +5V part Additional Evaluation on the EV kit and the device functions without changing 1) Set DMM2 to measure current and connect the other components. To optimize efficiency, refer to the positive terminal to VOUT (TP4). Connect the negative MAX16903 IC data sheet. terminal to an electronic load. 2) Set the electronic load to 500mA or use an equivalent resistor load. The resistor load is calculated based on +5V output and should be approximately 10I. If using a resistor load, make sure it can handle 5W. 3) Turn on the power supply and electronic load. DMM2 gives the load current while DMM1 gives the output voltage. 4) Increase the load to 1A and observe the output. Table 1. Jumper Descriptions (JU1, JU2, JU3) SHUNT JUMPER DESCRIPTION POSITION 1-2* Connects EN to VSUP (normal operation). JU1 2-3 Connects EN to PGND (shutdown). 1-2* Connects SYNC to VBIAS to enable forced-PWM mode. 2-3 Connects SYNC to AGND to enable skip mode under light-load conditions. JU2 When SYNC is unconnected or when a clock source is present, forced-PWM mode is enabled. Open SYNC can be used to synchronize with other supplies when a clock source is present. 1-2* Powers the green LED from the VBIAS supply. JU3 Open Does not power the green LED from the VBIAS supply. *Default position. 2 Evaluates: MAX16903/MAX16904