Evaluates: MAX8855 19-5582 Rev 0 10/10 MAX8855 Evaluation Kit General Description Features The MAX8855 evaluation kit (EV kit) is a fully assembled 2.35V to 3.6V Input Supply Voltage Range and tested circuit board that contains all the compo- 1.8V at 5A Output (Step-Down Regulator 1) nents necessary to evaluate the performance of the MAX8855. The device is a high-efficiency dual step- 1.2V at 5A Output (Step-Down Regulator 2) down regulator. The EV kit is powered from a 2.35V to 180 Out-of-Phase Operation Reduces Input 3.6V DC supply. Ripple Current The EV kit is capable of delivering 1.8V at 5A from out- put 1 and 1.2V at 5A from output 2. The device switch- All-Ceramic-Capacitor Design ing frequency is set to 1MHz and the two outputs High Efficiency switch 180 out-of-phase. High-efficiency, internal dual nMOS design keeps the board cool under heavy loads. 27m On-Resistance Internal MOSFETs The voltage-mode control architecture and the high- Fully Protected Against Overcurrent, Short bandwidth (> 15MHz typ) voltage-error amplifier allow a Circuit, and Overtemperature type III compensation scheme to be utilized to achieve fast response under both line and load transients, and REFIN on One Channel for Tracking or External also allow for ceramic output capacitors. Reference Programmable soft-start reduces input inrush current. Integrated Boost Diodes Two enable inputs allow the turning on/off of each output individually, resulting in great flexibility for system-level Programmable Switching Frequency from 0.5MHz designs. A reference input facilitates output-voltage to 2MHz tracking applications. Adjustable Outputs from 0.6V to (0.9 x V ) IN Ordering Information Individual Enable Inputs and PWRGD Outputs PART TYPE Low-Cost Solution MAX8855EVKIT+ EV Kit Fully Assembled and Tested +Denotes lead(Pb)-free and RoHS-compliant. 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 TOKO America, Inc. 847-297-0070 www.tokoam.com Note: Indicate that you are using the MAX8855 when contacting these component suppliers. Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION 2200pF 10%, 50V X7R ceramic 22F 20%, 6.3V X5R ceramic capacitor (0402) capacitors (1206) C7 1 C1, C23 2 TDK C1005X7R1H222K TDK C3216X5R0J226M Murata GRM155R71H222K Murata GRM31CR60J226K 0.22F 10%, 16V X5R ceramic 0.1F 10%, 16V X7R ceramic C8 1 capacitor (0402) C2, C3, C4, C6, capacitors (0402) 7 TDK C1005X5R1C224K C16, C17, C20 TDK C1005X7R1C104K Murata GRM155R71C104K 680pF 10%, 50V X7R ceramic capacitors (0402) C5 1 Not installed, capacitor C9, C15 2 TDK C1005X7R1H681K 0.022F 10%, 25V X7R ceramic Murata GRM1555R71H681K capacitor (0402) C12 1 TDK C1005X7R1E223K 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.MAX8855 Evaluation Kit Component List (continued) DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION 47pF 5%, 50V C0G ceramic 0.47H 20% inductors L1, L2 2 capacitors (0402) TOKO FDV0630-R47M C10, C14 2 TDK C1005C0G1H470J R1, R19 0 Not installed, resistors (0402) Murata GRM1555C1H470J R2 1 0 resistor (0402) 560pF 10%, 50V X7R ceramic R3, R4, R5, R12, C11, C13 2 capacitors (0402) 6 10k 1% resistors (0402) R13, R18 Murata GRM155R71H561K R6 1 4.99k 1% resistor (0402) 47F 20%, 6.3V X5R ceramic R7, R10 2 8.06k 1% resistors (0402) capacitors (1206) C18, C19 2 TDK C3216X5R0J476M R8, R9 2 210 1% resistors (0402) Murata GRM31CR60J476K R11 1 10 1% resistor (0402) 1000pF 10%, 50V X7R ceramic R14, R15 2 20k 1% resistors (0402) capacitors (0402) C21, C22 2 R16 1 49.9 1% resistor (1206) TDK C1005X7R1H102K Dual step-down regulator Murata GRM155R71H102K U1 1 (32 TQFN-EP*) FSYNC 0 Not installed, BNC connector Maxim MAX8855ETJ+ JU1, JU3 2 3-pin headers 2 Shunts, 2-position JU2 1 2-pin header 1PC B: MAX 8 855 EV ALUAT ION KI T+ *EP = Exposed pad. 5) Connect the positive lead of a voltmeter to the Quick Start OUT1 pad and the negative lead of the voltmeter to Recommended Equipment the PGND1 pad of the EV kit. MAX8855 EV kit 6) Connect the positive lead of the other voltmeter to Adjustable DC power supply capable of supplying the OUT2 pad and the negative lead of the volt- 3.6V at up to 7A meter to the PGND2 pad of the EV kit. Two electronic loads capable of sinking 5A (e.g., 7) Connect the positive lead of a 5A electronic load to HP 6060B) the OUT1 pad and the negative lead of the elec- tronic load to the PGND1 pad of the EV kit. Two voltmeters (DMM) 8) Connect the positive lead of the second 5A elec- Procedure tronic load to the OUT2 pad and the negative lead The EV kit is fully assembled and tested. Follow these of the electronic load to the PGND2 pad of the EV steps to verify board operation. Do not turn on the kit. power supply until all connections are completed: 9) Turn on the power supply. 1) Set the DC power supply in the 2.35V to 3.6V range 10) Verify that V is 1.8V throughout the 2.35V to OUT1 and turn off the power supply. 3.6V input voltage range. 2) Connect the positive lead of the power supply to 11) Verify that V is 1.2V throughout the 2.35V to OUT2 the IN pad and the negative pad to the PGND pad 3.6V input voltage range. of the EV kit. 12) Turn on both electronic loads. Repeat steps 10 and 11. 3) Verify that JU1 and JU2 do not have a shunt installed. 4) Verify that a shunt is across pins 1 and 2 of jumper JU3. 2 Evaluates: MAX8855