Evaluates: MAX15031 19-4376 Rev 0 11/08 MAX15031 Evaluation Kit General Description Features The MAX15031 evaluation kit (EV kit) demonstrates the Tiny 8mm x 18mm Circuit Footprint MAX15031 APD biasing pulse-width modulation (PWM) 2.9V to 5.5V Wide Supply Voltage Range step-up DC-DC converter with an internal power switch, 70V Output Voltage (Approximate) current monitor, and adjustable current limiting. The step-up converter switches at 400kHz. The EV kit oper- 0 to 4mA Output Current ates from a DC supply voltage of 2.9V to 5.5V and is Demonstrates APD Fast Current Limit configured to deliver approximately 70V and 0 to 4mA of current at the output. The output voltage can be con- Demonstrates Undervoltage Lockout figured from VIN + 1V to 76V by replacing a resistor or Demonstrates Thermal Shutdown Feature adjusting the CNTRL voltage. The EV kit demonstrates MOUT Output Overvoltage Protection Through the MAX15031 APD fast current-limit, undervoltage Clamping Circuit lockout (UVLO), and thermal shutdown features. Lead(Pb)-Free and RoHS Compliant The actual converter circuits PCB footprint is 8mm x 18mm as required in BPON (broadband passive optical Fully Assembled and Tested network) and GPON (gigabit passive optical network) applications and demonstrates the MAX15031s small, Ordering Information 16-pin TQFN package with exposed pad. The EV kit also features an APD input load simulator circuit for cur- PART TYPE rent monitoring and step-response measurements. MAX15031EVKIT+ EV Kit WARNING: Voltages exceeding 42V may exist on the VOUT, APD, MOUT, and PGND PCB pads. +Denotes lead(Pb)-free and RoHS compliant. Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION 1F 10%, 10V X5R ceramic JU2 1 3-pin header C1 1 capacitor (0402) 4.7H, 1.5A inductor L1 1 Murata GRM155R61A105K Coilcraft ME3220-472MLB 0.01F 10%, 25V X7R ceramic 100V 1.5A n-cha nnel M OS FET ( S OT23) C2 1 capacitor (0402) N1 1 Vishay Si2328DS-T1-E3 Murata GRM155R71E103K (Top Mark: CHV) 0.1F 10%, 16V X7R ceramic R1 1 348k 1% resistor (0603) C3, C8 2 capacitors (0402) R2 1 6.34k 1% resistor (0402) Murata GRM155R71C104K R3, R6 2 10k 1% resistors (0402) 0.1F 10%, 100V X7R ceramic capacitors (0805) R5 1 2.87k 1% resistor (0402) C4, C5 2 AVX 08051C104KAT R7 1 10k 1% resistor (0805) 0.01F 10%, 100V X7R ceramic R8 1 10k 1% resistor (1206) C6 1 capacitor (0805) R9 1 2k 1% resistor (0805) Murata GRM21BR72A103K R10 1 100 1% resistor (0402) C7 0 N ot ins tall ed , ceram i c capac i tor ( 0402) TP1, TP2, TP4 3 PC mini red test points 10F 10%, 10V X5R ceramic TP3, TP6 2 PC mini black test points C9 1 capacitor (0805) Murata GRM219R61A106K TP5 1 PC mini yellow test point 100V, 150 mA S ch ottky di ode ( S OD12 3) APD boost converter (16 TQFN-EP*) U1 1 D1 1 Diodes, Inc. BAT46W-7-F Maxim MAX15031ATE+ (Top Mark: L6) 2 Shunts ( JU1, JU2) JU1 1 2-pin header 1 PCB: MAX15031 Evaluation Kit+ *EP = Exposed pad. 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.MAX15031 Evaluation Kit Component Suppliers SUPPLIER PHONE WEBSITE AVX Corporation 843-946-0238 www.avxcorp.com Coilcraft, Inc. 847-639-6400 www.coilcraft.com Diodes, Inc. 805-446-4800 www.diodes.com Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com Vishay 402-563-6866 www.vishay.com Note: Indicate that you are using the MAX15031 when contacting these component suppliers. current-limiting circuit features. The circuits PWM Quick Start step-up DC-DC converter is designed for APD bias- Required Equipment ing, switches at 400kHz, and is configured to deliver Before beginning, the following equipment is needed: approximately 70V and 0 to 4mA of current to the APD output. The output voltage can be reconfigured from MAX15031 EV kit VIN + 1V to 76V by replacing resistor R1 or adjusting 2.9V to 5.5V, 1A DC power supply the CNTRL voltage. The EV kit demonstrates the 0 to 5mA adjustable load rated for at least 76V MAX15031s APD fast current-limit, undervoltage lock- out (UVLO), and thermal shutdown features. Digital multimeter (DMM) The converter circuits PCB footprint is 8mm x 18mm. WARNING: Voltages exceeding 42V may exist on The EV kit operates from a DC supply voltage of 2.9V to the VOUT, APD, MOUT, and PGND PCB pads. 5.5V and provides up to 4mA at the APD output. Procedure The EV kits APD load simulator circuit is used for cur- The MAX15031 EV kit is fully assembled and tested. rent monitoring and step-response measurements. The Follow the steps below to verify board operation. circuit is comprised of MOSFET N1, resistors R7, R8, Caution: Do not turn on the power supply until all R9, and test points TP1, TP2, and TP3 (SGND). Test connections are completed. point TP4 provides access to the MAX15031 BIAS signal. Voltages exceeding 42V may exist on TP4. 1) Verify that a shunt is installed on jumper JU1 (70V Additionally, bulk capacitor C9 is provided in case long output). connecting cables are used to power the EV kit during 2) Verify that a shunt is installed on pins 1-2 of jumper lab evaluation. Capacitor C9 is not required in a typical JU2 (enabled). design. 3) Connect the adjustable load to the APD and the SHDN and Enable SGND pads. The MAX15031 EV kit features a jumper to enable and 4) Connect the power supply to the VIN pad and the disable U1. Jumper JU2 will disable the EV kit when the power-supply ground to the PGND pad. shunt is installed on pins 2-3. Installing the shunt on 5) Connect the DMM across the APD and SGND PCB pins 1-2 enables the EV kit. Refer to the Shutdown pads. (SHDN) section in the MAX15031 IC data sheet for information. See Table 1 for jumper JU2 settings. 6) Turn on the power supply and set it to 3.3V. 7) Verify that the DMM reads approximately 70V. Table 1. SHDN and Enable (Jumper JU2) Detailed Description of Hardware SHUNT EV KIT SHDN PIN The MAX15031 evaluation kit (EV kit) demonstrates the POSITION OPERATION MAX15031 in a small, 16-pin TQFN package with 1-2 Connected to VIN Enabled internal power switch, current monitor, and adjustable 2-3 Connected to SGND Disabled 2 Evaluates: MAX15031