19-3730; Rev 1; 4/08 MAX5060 Evaluation Kit The MAX5060 evaluation kit (EV kit) provides a +3.3V adjustable output voltage from a +12V input source. It delivers up to 20A of output current with a switching frequency of 270kHz and achieves efficiencies up to 93%. The MAX5060 single-phase, PWM controller provides high-output-current capability in a compact package with a minimum number of external components. The MAX5060 utilizes average current-mode control that offers accurate current limit and current sharing, and avoids oversizing the MOSFETs and inductor. Differential sensing enables accurate control of the output voltage, while adaptive voltage positioning provides optimum transient response. An internal regulator enables operation with +4.75V to +5.5V, or +7V to +28V input-voltage ranges. The high switching frequency, up to 1.5MHz, allows the use of low inductor and input capacitor values. This accommodates the use of PCB-embedded planar magnetics, achieving superior reliability, current sharing, thermal management, compact size, and low system cost. The MAX5060 also features a clock input (CLKIN) for synchronization to an external clock, and a clock output (CLKOUT) with 180° phase delay to control a second out-of-phase converter for lower-input-capacitor ripple current. The MAX5060 also limits the reverse current if the bus voltage becomes higher than the regulated output voltage. This device is specifically designed to limit current sinking when multiple power-supply modules are paralleled. The MAX5060 offers an adjustable +0.6V to +5.5V (VIN > 7V) output voltage. Features ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ +10V to +14V Input-Voltage Range 3.3V Output Voltage 20A Output Current 270kHz Switching Frequency Up to 93% Efficiency Synchronization Up to 1.5MHz Limits Reverse-Current Sinking Voltage Signal Proportional to the Output Current Clock Output for Ripple-Phase Operation Overvoltage Protection Enable (ON/OFF) Input Power-Good Output Size: 1.65in x 1.05in Requires 400LFM Airflow and Larger Heatsink for 0°C to +70°C Temperature Range Ordering Information PART TYPE MAX5060EVKIT+ EV Kit +Denotes lead-free and RoHs-compliant. Component List DESIGNATION QTY DESCRIPTION C1, C3 2 470pF ±10%, 50V X7R ceramic capacitors (0402) KEMET C0402C471K5RAC Murata GRP155R71H471K C2 1 0.022µF ±10%, 16V X7R ceramic capacitor (0402) Murata GRP155R71C223K 1 0.01µF ±10%, 25V X7R ceramic capacitor (0402) KEMET C0402C103K3RAC Murata GRP155R71E103K C4 C5 1 0.22µF ±10%, 6.3V X5R ceramic capacitor (0402) Murata GRM155R60J224K DESIGNATION C6, C12 C7 C8, C9 QTY DESCRIPTION 2 0.47µF ±10%, 10V X5R ceramic capacitors (0603) KEMET C0603C474K8PAC Murata GRM188R61A474K 1 1µF ±10%, 10V X5R ceramic capacitor (0603) KEMET C0603C105K8PAC Murata GRM188R61A105K 2 0.1µF ±10%, 25V X7R ceramic capacitors (0603) KEMET C0603C104K3RAC Murata GRM188R71E104K ________________________________________________________________ Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. Evaluates: MAX5060 General Description MAX5060 Evaluation Kit Evaluates: MAX5060 Component List (continued) DESIGNATION C10, C11 2 DESCRIPTION 22µF ±20%, 16V X5R ceramic capacitors (1812) Murata GRM43ER61C226M C13 1 220µF ±20%, 4V, 5mΩ E-size, SP-cap Panasonic EEFSE0G221R C14 1 Not installed (0603) C15 C16 D1 1 1 1 100µF ±20%, 6.3V X5R ceramic capacitor (1210) AVX 12106D107MAT Murata GRM32ER60J107M 47µF ±20%, 6.3V X5R ceramic capacitor (1206) Murata GRM31CR60J476M 20V, 0.5A Schottky diode (SOD123) Diodes Inc. B0520LW Fairchild Semiconductor MBR0520L Central Semiconductor CMHSH5-2L DESIGNATION QTY R1 1 2.0kΩ ±1% resistor (0402) DESCRIPTION R2 1 100kΩ ±1% resistor (0402) 51.1kΩ ±1% resistor (0402) R3 1 R4, R17 2 4.99kΩ ±1% resistors (0402) R5 1 100kΩ ±5% resistor (0402) R6 1 226kΩ ±1% resistor (0402) R7, R14 0 Not installed, resistors (0402) R8 1 10kΩ ±1% resistor (0402) 0Ω resistor (0603) R9 1 R10 1 5.6kΩ ±5% resistor (0402) R11 1 1Ω ±5% resistor (0402) R12 1 2.2Ω ±5% resistor (0402) R13 1 0.001Ω ±1%, 0.5W current-sense resistor (2010) Vishay Dale WSL2010-18 0.001 R15, R18 2 22Ω ±5% resistors (0402) R16 1 22.1kΩ ±1% resistor (0402) R19 1 10kΩ ±5% resistor (0402) 35V, 8A Schottky diode POWERMITE 3 Microsemi UPS835LE3/TR13 R20 1 100kΩ ±5% resistor (0402) R21 1 20.5kΩ ±1% resistor (0402) U1 1 1 30V, 0.1A Schottky diode (SOD523) Central Semiconductor CMOSH-3 Current-mode DC-DC controller (28 TQFN) Maxim MAX5060ETI+ J1 1 8-pin header, single-row, straight, 0.05in center — 1 L1 1 0.6µH, 20A inductor Pulse PG0702.601NL Aluminum heatsink Width = 0.40in, height = 0.40in Length = 1.65in Color = unfinished N1, N2 2 20V, 25A, 4mΩ n-channel MOSFETs (8 SO PowerPak) Vishay Siliconix Si7866DP — 1 Double-sided thermal tape, 0.40in x 1.65in Bond-ply 100 Thickness = 0.008in The Bergquest Company BP100-0.008 1 PCB: MAX5060 Evaluation Kit+ 1 npn transistor (SOT523) Central Semiconductor CMUT2222A — Q1 D2 D3 2 QTY 1 _______________________________________________________________________________________ MAX5060 Evaluation Kit SUPPLIER PHONE WEBSITE AVX Corporation 843-946-0238 www.avxcorp.com Central Semiconductor Corp. 631-435-1110 www.centralsemi.com Diodes Inc. 805-446-4800 www.diodes.com Fairchild Semiconductor 888-522-5372 www.fairchildsemi.com KEMET Corp. 864-963-6300 www.kemet.com Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com Panasonic Corp. 800-344-2112 www.panasonic.com Pulse Engineering 858-674-8100 www.pulseeng.com TDK Corp. 847-803-6100 www.component.tdk.com Vishay 402-563-6866 www.vishay.com Note: Indicate that you are using the MAX5060 when contacting these component suppliers. Quick Start Detailed Description of Hardware Recommended Equipment The MAX5060 EV kit provides a +3.3V adjustable output voltage from a +12V input source. It delivers up to 20A of output current with 400LFM of airflow. Before beginning, the following equipment is needed: • MAX5060 EV kit • One DC power source capable of supplying 10A at 12V • One voltmeter • One load capable of sinking 30A Procedure The MAX5060 EV kit is a fully assembled and tested surface-mount board. Follow the steps below to verify board operation. Caution: Do not turn on the power supply until all connections are completed. 1) Connect +VIN and COM to the DC power. 2) Connect +VOUT and COM to the load. 3) Set the load to 5A. 4) Turn on the power supply and increase the voltage to 12V. Remote Voltage Sensing For high currents, there can be significant voltage drop across the wires connecting the MAX5060 converter to the load. To compensate for this voltage drop, the MAX5060 EV kit includes remote sense pins that allow the voltage to be sensed at the load. To use this feature, connect wires from VOUT_SENSE and SENSE(pins 7 and 8 of J1 on the MAX5060 EV kit) to the load. Enable The EN (pin 11 on the MAX5060) is internally pulled up to VCC with 15µA of current. This allows the MAX5060 to power on when the +12V input source powers on. To control enable with an external signal generator, connect the external signal generator to enable (pin 4 of J1 on the MAX5060 EV kit). A logic-low shuts down the power drivers. 5) Verify the voltage at +VOUT is +3.3V. _______________________________________________________________________________________ 3 Evaluates: MAX5060 Component Suppliers Evaluates: MAX5060 MAX5060 Evaluation Kit Table 1. MAX5060 EV Kit Pinout CONNECTOR J1 PIN NAME DESCRIPTION Drive with an external signal to synchronize the switching frequency. Connecting to COM turns off the MAX5060. 1 SYNC/ON 2 V_IOUT 3 SGND 4 EN 5 PGOOD 6 CLK_OUT 7 SENSE- Low-Side Remote Voltage Sense Input. 8 VOUT_SENSE High-Side Remote Voltage Sense Input. The voltage on this pin is proportional to the output load current. On the MAX5060 EV kit, V_IOUT = 0.135 x ILOAD. Signal Ground. Enable. Power-Good Output. Open-drain, active-low output goes low when the output voltage falls out of regulation. Oscillator Output. Output Voltage The MAX5060 EV kit provides a +3.3V output voltage. Change the output voltage to a value between 0.6V and 5.5V by changing the resistor-divider R16/R17. Use the equation shown below to set the output voltage. R16 R17 = ⎞ ⎛ ⎜ VOUT(NL) ⎟ ⎟ −1 ⎜ ⎜ 0.6 × ⎛1 + R4 ⎞ ⎟ ⎜ ⎟ ⎜ ⎝ R2 ⎠ ⎟⎠ ⎝ Use resistors between 1kΩ and 10kΩ. 4 _______________________________________________________________________________________ MAX5060 Evaluation Kit Evaluates: MAX5060 Figure 1. MAX5060 EV Kit Pinout _______________________________________________________________________________________ 5 MAX5060 U1 Evaluates: MAX5060 MAX5060 Evaluation Kit Figure 2. MAX5060 EV Kit Schematic 6 _______________________________________________________________________________________ MAX5060 Evaluation Kit Figure 5. MAX5060 EV Kit PCB Layout—GND (Layer 2) Figure 4. MAX5060 EV Kit PCB Layout—Top Layer Figure 6. MAX5060 EV Kit PCB Layout—Signal and GND (Layer 3) _______________________________________________________________________________________ Evaluates: MAX5060 Figure 3. MAX5060 EV Kit Component Placement Guide—Top Layer 7 Evaluates: MAX5060 MAX5060 Evaluation Kit Figure 7. MAX5060 EV Kit PCB Layout—Signal (Layer 4) Figure 8. MAX5060 EV Kit PCB Layout—GND (Layer 5) Figure 9. MAX5060 EV Kit PCB Layout—Bottom Layer Figure 10. MAX5060 EV Kit Component Placement Guide— Bottom Layer 8 _______________________________________________________________________________________ MAX5060 Evaluation Kit REVISION NUMBER REVISION DATE 0 6/05 Initial release 1 4/08 Replaced obsolete inductor L1 and changed PCB to lead-free and RoHS-compliant. DESCRIPTION PAGES CHANGED — 1, 2, 5–8 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 9 © 2008 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc. Evaluates: MAX5060 Revision History