19-2782; Rev 0; 2/03 MAX5037 Evaluation Kit Warning The MAX5037 EV kit is designed to operate at high currents, and some of the components operate at high temperatures. Avoid touching the components. The evaluation board is not provided with a fuse. Use a controlled current source to power up the board. Under severe fault conditions, this EV kit may dissipate a large amount of power. To avoid possible personal injury, operate this kit with care. Pentium is a registered trademark of Intel Corp. Component List DESIGNATION QTY DESCRIPTION C1, C2 2 47µF ±20%, 16V X5R ceramic capacitors (2220) TDK C5750X5R1C476M C3–C11 9 22µF ±20%, 16V X5R ceramic capacitors (1812) TDK C4532X5R1C226M C12–C21 10 270µF, 2V, 15mΩ low-ESR specialty capacitors Panasonic EEFUE0D271R C22, C23 2 100µF ±10%, 6.3V ceramic capacitors (2220) Murata GRM55FR60J107KA01L C24–C29 6 10µF ±20%, 6.3V X5R ceramic capacitors (0805) TDK C2012X5R0J106M C30, C42 2 0Ω resistors (0603) C31, C35, C37 3 0.01µF ±5%, 50V X7R ceramic capacitors (0603) Murata GRM188R71H103KA01 Features ♦ Designed to Meet VRM 9.0 Mechanical and Electrical Specifications ♦ Two-Phase Power Conversion ♦ 5V or 12V Input Operation (Design Optimized for 12V Input) ♦ Output Voltage Programmable from 1.1V to 1.85V in 25mV Step-Through VID Input ♦ VRM 9.0-Compliant Integrated 5-Bit DAC ♦ 52A Output Current ♦ Adaptive Voltage Positioning for Optimized Transient Response ♦ Average Current-Mode Control for Superior Current Sharing ♦ Current-Sharing Accuracy Within 5% Between Parallel Channels ♦ Up to 95% Efficiency ♦ 500kHz Effective Switching Frequency (Two Phases) ♦ Output Overload Protection ♦ Output Overvoltage Crowbar Protection ♦ Internal Undervoltage Lockout and Startup Circuit ♦ Excellent Line-and-Load Transient Response ♦ Phase Failure Detector ♦ Multiple-Phase Synchronization Between Parallel Modules ♦ VRM 9.0-Compliant EDGE Connector Ordering Information PART MAX5037EVKIT TEMP RANGE 0°C to +60°C IC PACKAGE 44 QFN ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 Evaluates MAX5037 General Description The MAX5037 evaluation (EV) kit is a fully assembled and tested VRM power-supply evaluation kit. The EV kit module can be inserted directly into the VRM daughter board AMP connector (1364125-1 or equivalent) on Pentium® 4 processor motherboards. The input voltage range is either 4.75V to 5.5V or 8V to 13.2V. The EV kit design is optimized for the best performance at 12V input and 1.75V output voltage settings. The output is programmable from 1.1V to 1.85V through VID input in compliance with Intel’s VRM 9.0 specification. Up to 52A load current is possible from dual-phase conversion. High-power density and simple assembly is achieved due to a lower component count using the MAX5037. Evaluates MAX5037 MAX5037 Evaluation Kit Component List (continued) DESIGNATION QTY C32, C41 2 C33, C36, C38 3 470pF ±5%, 16V COG ceramic capacitors (0603) Murata GRM1885C1H471JAB01 C34 C39, C44, C45 C40 C43 1 4700pF ±5%, 16V X7R ceramic capacitor (0603) Vishay VJ0603Y471JXJ 3 0.1µF ±10%, 16V X7R ceramic capacitors (0603) Murata GRM188R71C104KA01 1 1 1µF, 10V Y5V ceramic capacitor (0603) Murata GRM188F51A105 4.7µF ±10%, 16V X7R ceramic capacitor (0805) Murata GRM40-034X5R475K6.3 CON1 0 Not installed D1, D2 2 Schottky diodes ON Semi MBRS340T3 D3, D4 2 DESCRIPTION 0.47µF ±10%, 16V capacitors (0805) TDK C1608X5R1A474K 2 Schottky diodes ON Semi MBR0520LT1 DESIGNATION QTY DESCRIPTION L1, L2 2 0.6µH ±10% power inductors, 13mm × 13mm Panasonic ETQP1H0R6BFX Q1, Q2, Q5, Q6 4 MOSFETs PowerPAK SO-8 Vishay-Siliconix Si7860DP Q3, Q4, Q7, Q8 4 MOSFETs PowerPAK SO-8 Vishay-Siliconix Si7886DP R1–R4 4 0.0027Ω resistors (2512) Panasonic ERJM1WSF2M7U R5 1 10Ω ±1% resistor (0603) R6, R19, R21 3 Not installed R7, R15 2 3.3Ω ±1% resistors (0805) R8 1 2.2Ω ±1% resistor (0805) R9 1 7.5kΩ ±1% resistor (0603) R10, R18 2 1kΩ ±1% resistors (0603) R11, R14 2 49.9Ω ±1% resistors (0603) R12, R20 2 0Ω ±1% resistors (0805) R13, R16 2 0Ω ±1% resistors (0603) R17 1 1Ω ±1% resistor (0603) R22, R23 2 37.4kΩ ±1% resistors (0603) R24 1 4.99kΩ ±1% resistor (0603) R25 1 10kΩ ±1% resistor (0603) SCR1 1 SCR 200V, 12A D-Pack Teccor S2012D HS1, HS2 2 Surface-mount flatback heatsinks AAVID NP973541 JP3, JP4 2 3-pin headers Digi-Key S1012-03-ND U1 1 MAX5037ETH, dual-phase controller (44-pin QFN) JP5 1 2-pin header Digi-Key S1012-02-ND None 2 Shunts, JP3-2/3, JP4-2/3 Digi-Key SD9000-ND _______________________________________________________________________________________ MAX5037 Evaluation Kit SUPPLIER PHONE FAX WEBSITE AAVID Thermalloy 603-224-9988 603-223-1790 Murata 770-436-1300 770-436-3030 www.murata.com ON Semiconductor 602-244-6600 602-244-3345 www.on-semi.com Panasonic 714-373-7939 714-373-7183 www.panasonic.com TDK 847-803-6100 847-390-4405 www.tdk.com Teccor 972-580-7777 972-550-1309 www.teccor.com Vishay 402-563-6866 402-563-6296 www.vishay.com www.aavidthermalloy.com Note: When contacting these suppliers, please indicate you are using the MAX5037. Quick Start The MAX5037 EV kit is fully assembled and tested. The termination for input, output, and control is provided at the edge connector as per VRM 9.0 specification. The MAX5037 EV kit module fits into AMP connector 1364125-1 or equivalent. Follow these steps to verify board operation. In the quick-start operation, full load performance cannot be verified. 12V Input Operation 1) Connect a wire from edge-connector pin 57 to COM. This sets the VID code to 01111 and output voltage of 1.475V. 2) Place a jumper between pins 2 and 3 of JP4 for 250kHz switching frequency operation. 3) Connect a voltage source (15V/20A, min) at the input (across C1 or C2). Use heavy-gauge wire, and keep the connecting wires between the EV kit and voltage source short. Use 2200µF/16V at the input if the wires running from the voltage source to the EV kit are thin and long. Connect voltmeters across +VIN to COM and +VOUT to COM. 4) Connect the load between +VOUT (edge-connector pins 49, 50) to COM (edge-connector pins 40, 42), with ammeter in series; set the load to 1Ω. Connect the voltmeter between SENSE+ (edge-connector pin 52) and SENSE- (edge-connector pin 11) to monitor the output voltage. 5) Gradually increase the input voltage to 12V while monitoring the output voltage and input current. 2) Connect a wire from edge-connector pin 57 to COM. This sets the VID code to 01111 and output voltage of 1.475V. 3) Place a shunt between pins 2 and 3 of jumper JP4 for 250kHz switching frequency operation. For 500kHz operation, move the shunt to pins 1 and 2 of jumper JP4. 4) Connect a voltage source (range up to 15V/20A) at the input (across C1 or C2). Use heavy-gauge wire, and keep the connecting wires between the EV kit and voltage source short. Use 2200µF/16V at the input if the wires running from the source to the EV kit are thin and long. Connect voltmeters across +VIN to COM and +VOUT to COM. 5) Connect the load between +VOUT (edge-connector pins 49, 50) to COM (edge-connector pins 40, 42), with ammeter in series; set the load to 1Ω. 6) Connect the voltmeter between SENSE+ (edgeconnector pin 52) and SENSE- (edge-connector pin 11) to monitor the output voltage. 7) Gradually increase the input voltage to 5V while monitoring the output voltage and input current. Caution 1) Do not cover the gold plating of the edge connector with solder if you want to evaluate the full load operation using the AMP connector. 2) In case of 5VIN operation, keep the input voltage below 6V (Refer to the Absolute Maximum Ratings of the MAX5037 data sheet). 5V Input Operation 1) Short the JMPR-5VIN pins with wire on the bottom layer of the EV kit PC board. This connects IN (MAX5037 pin 28) and VCC (MAX5037 pin 27) (Figure 18). _______________________________________________________________________________________ 3 Evaluates MAX5037 Component Suppliers Evaluates MAX5037 MAX5037 Evaluation Kit Specifications VIN = 5V or 12V (±10%) VOUT = 1.1V to 1.85V through VID inputs (see Table 1) IOUT = 52A Efficiency = 90% Adaptive Voltage Positioning = 120mV at 52A Step Load = 9A to 52A Step Load Slew Rate = 50A/µs Dynamic Load Regulation = -189mVMAX (for VID setting of 1.75VOUT) Termination = 62-pin edge connector (AMP136125-1 or equivalent) Pin Details = As per VRM 9.0 specifications Operating Temperature = 0°C to +60°C (with 400LFM airflow) Table 1. Output Voltage vs. DAC Codes VID INPUTS (0 = Connected to SGND, 1 = Open Circuit) 4 OUTPUT VOLTAGE (V) VID4 VID3 VID2 VID1 VID0 VOUT 1 1 1 1 1 Output off 1 1 1 1 0 1.100 1 1 1 0 1 1.125 1 1 1 0 0 1.150 1 1 0 1 1 1.175 1 1 0 1 0 1.200 1 1 0 0 1 1.225 1 1 0 0 0 1.250 1 0 1 1 1 1.275 1 0 1 1 0 1.300 1 0 1 0 1 1.325 1 0 1 0 0 1.350 1 0 0 1 1 1.375 1 0 0 1 0 1.400 1 0 0 0 1 1.425 1 0 0 0 0 1.450 0 1 1 1 1 1.475 0 1 1 1 0 1.500 0 1 1 0 1 1.525 0 1 1 0 0 1.550 0 1 0 1 1 1.575 0 1 0 1 0 1.600 0 1 0 0 1 1.625 0 1 0 0 0 1.650 0 0 1 1 1 1.675 0 0 1 1 0 1.700 0 0 1 0 1 1.725 0 0 1 0 0 1.750 0 0 0 1 1 1.775 0 0 0 1 0 1.800 0 0 0 0 1 1.825 0 0 0 0 0 1.850 _______________________________________________________________________________________ MAX5037 Evaluation Kit Evaluates MAX5037 3.80 0.25 0.25 JP3 JP4 COMPONENT SIDE MAX5037 EV KIT 2.30 JP5 PIN 1 ON SOLDER SIDE 1 62 31 32 CON1 0.30 0.35 0.07 Figure 1. Outline Drawing of MAX5037 EV Kit Table 2. Edge-Connector Pin Configuration PIN FUNCTION PIN FUNCTION PIN FUNCTION PIN FUNCTION 1 VIN+ 16 VO+ 31 VO- 47 VO+ 2 VIN+ 17 VO- 32 VO- 48 VO- 3 VIN+ 18 VO+ 33 VO+ 49 VO+ 4 VIN+ 19 VO- 34 VO- 50 VO+ 5 Rsvd 20 VO+ 35 VO+ 51 Rsvd SENSE+ 6 Key 21 VO- 36 VO- 52 7 VID3 22 VO+ 37 VO+ 53 EN 8 VID1 23 VO- 38 VO- 54 NC VID0 9 Rsvd 24 VO+ 39 VO+ 55 10 PGOOD 25 VO- 40 VO- 56 VID2 11 SENSE- 26 VO+ 41 VO+ 57 VID4 12 Rsvd 27 VO- 42 VO- 58 VRM-pres 13 VO- 28 VO+ 43 VO+ 59 VIN- 14 VO+ 29 VO- 44 VO- 60 VIN- 15 VO- 30 VO+ 45 VO+ 61 VIN- 46 VO- 62 VIN- _______________________________________________________________________________________ 5 Detailed Description The MAX5037 EV kit is a voltage-regulating module that provides 1.1V to 1.85V at 52A current from either a 5V or 12V input. The input voltage range can be 4.75V to 5.5V for 5V input and 8V to 13.2V for 12V input conditions. Use 2200µF/16V across the input if the wires running from the source to the EV kit are thin and long. The output voltage is set from 5-bit VID input according to the Intel VRM 9.0 specification (see Table 1). The form factor and input/output terminations are also as per the Intel VRM 9.0 specification. See Table 2 for pinouts of edge connectors compatible with AMP1364125-1. CLKIN is accessible through a 3-pin header (JP3), and a shunt is provided for setting the switching frequency to either 250kHz or 500kHz. The phase-shifted clock output (CLKOUT) is available at the 2-pin header (JP5) and can be used to synchronize other MAX5037 EV kits. Use JP3 to set the phase shift of 60°, 90°, or 120°. The MAX5037 EV kit is designed to achieve optimum electrical performance at a 12V input. High efficiency is achieved with careful component selection (Figure 18). The switching MOSFETs, inductors, and sense resistors are the major power-dissipating components. Two MOSFETs are used at the upper and lower sides of each phase to distribute the dissipated power in two different packages. The product of the gate charge and on-resistance of the MOSFET is a figure of merit, with a lower number signifying better performance. The MOSFETs chosen are optimized for a high-frequency switching application. The upper MOSFETs have a low gate charge and moderate on-resistance, and the lower MOSFETs have very low on-resistance and a moderate gate charge. The inductor is a low-profile, high-current type with low DC resistance. The sense resistors have very low inductance. Plenty of copper is provided around these power components to dissipate heat effectively. The input capacitors are high-ripple-current capacity, very low ESR, ceramic type. The output capacitors have to support large output current during the load transient. Both polymer and ceramic-type capacitors are used to achieve high output capacitance and low ESR at high frequency. 5V Input Operation The EV kit is designed for the best efficiency, transient load performance at 12V input. The 5V input operation can also be verified without significant component change. Short the JMPR-5VIN pins with wire on the bottom layer of the EV kit PC Board. This connects IN (pin 28) and VCC (pin 27) of the MAX5037. For 5V input operation, the switching frequency can be increased to 500kHz without significantly increasing the power losses. To change the switching frequency to 500kHz, move 6 VOLTAGE-POSITIONING WINDOW Evaluates MAX5037 MAX5037 Evaluation Kit VCNTR + ∆VOUT/2 VCNTR VCNTR - ∆VOUT/2 NO LOAD 1/2 LOAD FULL LOAD LOAD (A) Figure 2. VRM Loadline with VCNTR = VID at Half Load the shunt to pins 1 and 2 of JP4. For optimum transient load performance, replace the existing 0.6µH inductors with 0.3µH inductors. Output Voltage The output voltage set through the VID code has ±0.8% accuracy. The voltage positioning and the ability to operate with multiple reference voltages might require the output to regulate away from a center value. Define the center value as the voltage when the output voltage equals the VID reference at exactly one-half the maximum output current. Set the voltage-positioning window (∆VOUT) using the resistive feedback of the voltage-error amplifier. Use the following equation to determine the values of RF (R23) and RIN (R24) required for setting the voltagepositioning window: ∆VOUT = (R24 ✕ IOUT ) / (2 ✕ R23 ✕ GC) The voltage at CNTR (pin 18) regulates to 1.2V (Figure 18). The inverting input to the voltage-error amplifier (VEA) mirrors the current set by the resistor at CNTR, centering the output voltage-positioning window around the VID programmed output voltage. Set the center of the output voltage with a resistor from CNTR to SGND as: R21 = 1.2 × R24 R24 IOUT + ( VOUT − VID) 2 × R23 × GC 0.05 RS R1 × R2 R 3 × R4 RS = = R1 + R2 R 3 + R4 GC = _______________________________________________________________________________________ MAX5037 Evaluation Kit Evaluates MAX5037 OUTPUT VOLTAGE vs. ILOAD AND RCNTR 1.90 RCNTR = 50kΩ 1.85 1.80 VOUT (V) where R24 and R23 are the input and feedback resistors of the voltage-error amplifier, GC is current-loop gain, and RS is the current-sense resistor. See Figure 4 and Figure 5 for the output voltage vs. the RCNTR (R21). Applying the voltage-positioning window at different VRM voltage settings requires an additional element proportional to the VID setting. The resistor from REG (pin 15) to SGND provides a current proportional to the VID setting (Figure 18). Calculate the resistor from REG to SGND as: RCNTR = 100kΩ 1.75 1.70 RCNTR = 200kΩ RCNTR = ∞ 1.65 R22 = R23 VIN = +12V VID SETTING = +1.75V 1.60 0 5 10 15 20 25 30 35 40 45 50 55 ILOAD (A) R22 = Figure 4. Output Voltage vs. ILOAD and RCNTR OUTPUT VOLTAGE vs. ILOAD AND RCNTR 1.60 VIN = +12V VID SETTING = +1.4V 1.55 RCNTR = 50kΩ 1.50 VOUT (V) where R23 is the feedback resistor of the voltage-error amplifier. The voltage on REG is internally regulated to the programmed VID output voltage. Note that in the case of VID voltage setting equal to VCOREMAX at IOUT = 0 (no load), R21 is calculated from the above equation as infinity. Because the VID setting has an output voltage set-point accuracy specification of 0.8%, the output voltage may exceed the V CCMAX limit. For systems requiring V CCMAX as an absolute maximum voltage at IOUT = 0 (no load), RREG can be recalculated using the following equation: R24 × R23 V R24 + R23 × 1 − COREMAX VID 1.45 1.40 RCNTR = 100kΩ 1.35 RCNTR = 200kΩ 1.30 RCNTR = ∞ 1.25 1.20 The voltage positioning of 120mV at 52A load is set in the MAX5037 EV kit. See Figure 6 for the VRM output load line for voltage positioning at a different ratio of RF (R23) and RIN (R24). 0 5 10 15 20 25 30 35 40 45 50 55 ILOAD (A) Figure 5. Output Voltage vs. ILOAD and RCNTR OUTPUT VOLTAGE vs. OUTPUT CURRENT AND ERROR AMP GAIN (RF / RIN) VCOREMAX - ∆VOUT/2 VCOREMAX - ∆VOUT VIN = +12V VOUT = +1.8V Rf / RIN = 15 1.80 Rf / RIN = 12.5 VOUT (V) VOLTAGE-POSITIONING WINDOW VCOREMAX ≤ VID 1.85 1.75 1.70 Rf / RIN = 7.5 Rf / RIN = 10 1.65 NO LOAD 1/2 LOAD FULL LOAD LOAD (A) 1.60 0 5 10 15 20 25 30 35 40 45 50 55 ILOAD (A) Figure 3. VRM Loadline with VCOREMAX = VID at No Load Figure 6. Output Voltage vs. Output Current and Error AMP GAIN (RF/RIN) _______________________________________________________________________________________ 7 Ripple and Noise EFFICIENCY vs. OUTPUT CURRENT AND INPUT VOLTAGE 100 90 80 VIN = +5V 60 50 40 30 20 10 VOUT = +1.8V fSW = 250kHz 0 Transient Load Response The EV kit is designed to handle high slew-rate-current step without exceeding the dynamic load regulation limit of the output voltage. Figure 8 depicts the dynamic load performance with 50A/µs slew rate of the current step. VIN = +12V 70 η (%) The worst-case peak-to-peak output-ripple voltage depends on the inductor ripple current, capacitance, and ESR of the output capacitors. In multiphase converter design, the ripple currents from individual phases cancel each other, and the resultant ripple current is lower. The degree of ripple cancellation depends on the operating duty cycle and number of phases. Note that ripple cancellation is maximum when the NPH = K/D condition is met, where NPH is the number of phases, D is the operating duty cycle, and K = 1, 2, or 3. See Figure 7 for the output ripple waveforms of the EV kit at full load. 0 4 8 12 16 20 24 28 32 36 40 44 48 52 IOUT (A) Figure 9. Efficiency vs. Output Current and Input Voltage EFFICIENCY vs. OUTPUT CURRENT AND OUTPUT VOLTAGE OUTPUT RIPPLE 100 90 80 VOUT = +1.5V VOUT (AC-COUPLED) 10mV/div η (%) 70 60 VOUT = +1.8V VOUT = +1.1V 50 40 30 20 VIN = +12V VOUT = +1.75V IOUT = 52A 10 VIN = +12V fSW = 250kHz 0 0 4 8 12 16 20 24 28 32 36 40 44 48 52 500ns/div Figure 7. Output Ripple IOUT (A) Figure 10. Efficiency vs. Output Current and Output Voltage EFFICIENCY vs. OUTPUT CURRENT AND OUTPUT VOLTAGE LOAD-TRANSIENT RESPONSE 100 90 80 70 η (%) Evaluates MAX5037 MAX5037 Evaluation Kit VOUT 50mV/div VOUT = +1.5V VOUT = +1.8V 60 50 VOUT = +1.1V 40 30 VIN = +12V VOUT = +1.75V ISTEP = 8A TO 52A tRISE = 1µs 20 10 0 0 4 8 12 16 20 24 28 32 36 40 44 48 52 40µs/div Figure 8. MAX5037 EV Kit Transient Response 8 VIN = +5V fSW = 500kHz IOUT (A) Figure 11. Efficiency vs. Output Current and Output Voltage _______________________________________________________________________________________ MAX5037 Evaluation Kit VPGOOD 2V/div VOUT 500mV/div VIN = +12V VOUT = +1.75V IOUT = 0A VIN 10V/div 2ms/div Figure 12. Input Startup Response INPUT STARTUP RESPONSE VPGOOD 1V/div VOUT 1V/div VIN 5V/div The MAX5037 offers inherent soft-start at turn-on through its current-error amplifier compensation capacitors. The output rises monotonically without overshoot. The output voltage reaches its specified range within 10ms of the input power reaching its operating voltage range at full load. See Figures 12, 13, and 14. Current Limiting The average current-mode control technique of the MAX5037 limits the maximum output current per phase accurately. The MAX5037 senses and limits the peak inductor current (IL-PK) across the sense resistor. Two channels limit the current. The regular channel terminates the ON cycle when the current-sense voltage reaches 48mV (typ). The faster channel, with only 260ns delay, terminates the ON cycle when the voltage across the sense resistor reaches 112mV during output short-circuit and inductor saturation. Use the following equation to calculate the current limit: 0.05 IOUT = × N R1// R2 For the EV kit, current limit occurs at 63A typically with RSENSE equal to 1.6mΩ. In case of a short circuit at the output, the average output current is maintained at its current-limit value. External Synchronization with CLKIN and CLKOUT VIN = +12V VOUT = +1.75V IOUT = 52A 2ms/div Figure 13. Input Startup Response ENABLE STARTUP RESPONSE VPGOOD 1V/div Multiple MAX5037 EV kits can be paralleled to increase output current capacity. The EV kit is provided with the CLKIN input (JP4) and CLKOUT (JP5) output for easy paralleling. The CLKOUT is phase delayed from CLKIN or DH1 by an amount set by PHASE (JP3). A jumper between pins 1 and 2 set the phase delay to 60°, a jumper between pins 2 and 3 set the delay to 120°, and the OPEN jumper sets the phase delay to 90°. Figures 15, 16, and 17 show the CLKOUT position with respect to CLKIN and DH1 for 60°, 90°, and 120°, respectively. VOUT 1V/div VIN = +12V VOUT = +1.75V IOUT = 52A VIN 2V/div 1ms/div Figure 14. Enable Startup Response _______________________________________________________________________________________ 9 Evaluates MAX5037 Turn On INPUT STARTUP RESPONSE Evaluates MAX5037 MAX5037 Evaluation Kit CLKOUT vs. CLKIN AND DH 60° PHASE DELAY FSW = 250kHz VIN = 12V VOUT = 1.75V CLKOUT vs. CLKIN AND DH 90° PHASE DELAY FSW = 250kHz VIN = 12V VOUT = 1.75V CLKIN 5V/div DH1 20V/div DH1 20V/div DH2 20V/div DH2 20V/div CLKOUT 5V/div CLKOUT 5V/div 400ns/div 400ns/div Figure 15. CLKOUT vs. CLKIN and DH 60° Phase Delay Figure 16. CLKOUT vs. CLKIN and DH 90° Phase Delay CLKOUT vs. CLKIN AND DH 120° PHASE DELAY FSW = 250kHz VIN = 12V VOUT = 1.75V CLKIN 5V/div DH1 20V/div DH2 20V/div CLKOUT 5V/div 400ns/div Figure 17. CLKOUT vs. CLKIN and DH 120° Phase Delay 10 CLKIN 5V/div ______________________________________________________________________________________ VIN+ HEATSINK-AAVIDI HS2 HEATSINK-AAVIDI HS1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 CON1 VIN+ VINVIN+ VINVIN+ VINVIN+ VINRESRV VRM-PRES KEY VID4 VID3 VID2 VID1 VID0 RESRV ISHARE PWRGD OUTEN VO-SEN- VO-SEN+ RESRV RESRV VOVOVO+ VO+ VOVOVO+ VO+ VOVOVO+ VO+ VOVOVO+ VO+ VOVOVO+ VO+ VOVOVO+ VO+ VOVOVO+ VO+ VOVOVO+ VO+ VOVOVO+ VO+ VOVO- 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 +VOUT VIN- 2 C38 470pF C37 0.01µF HEADER 3 PIN 1 R25 10kΩ R18 1kΩ 3 SENSE- SENSE+ PWRGD OVPOUT CLP1 OVPIN SGND VD0 VD1 VD2 VD3 44 43 R10 1kΩ C35 0.01µF 12 13 R24 4.99kΩ 11 10 9 8 7 6 5 4 3 2 1 C36 470pF CLP2 EAN JP3 42 PLLCMP 14 41 40 R9 7.5kΩ C34 4.7µF R23 37.4kΩ 15 16 R22 37.4kΩ EAOUT PC BOARD EDGE CONNECTOR PHASE REG HEADER 3 PIN 39 38 C33 470pF U1 MAX5037 CSN2 CSP1 3 17 18 37 N.C. 36 35 20 21 R21 OPEN 19 EN 2 CLKOUT SGND 1 SGND N.C. JP4 CSP2 CSN1 VD4 DIFF CLKIN CNTR 34 22 DL2 LX2 DH2 N.C. C39 0.1µF DH1 LX1 DL1 VDD VCC IN PGND BST2 BST1 23 24 25 26 27 28 29 30 31 32 33 R8 2.2Ω C40 1µF C45 0.1µF R17 1Ω R16 0Ω 2 R13 0Ω C41 0.47µF/16V R20 0Ω R15 3.3Ω C43 4.7µF C44 0.1µF MBR0520LT1 MBR05020LT1 D3 D4 C32 0.47µF/16V R7 3.3Ω 1 R12 0Ω D2 R1 2.7mΩ R19 OPEN L1 0.6µH/27A R3 2.7mΩ L2 0.6µH/27A MBRS340T3 Q3 Q4 Si7886DP D1 Q1 Q2 Si7860DP C3 C4 C5 C6 C7 5X 22µF/ 16V X5R Q7 Q8 Si7886DP MBRS340T3 R6 OPEN C31 0.01µF 4X 22µF/16V X5R C8 C9 C10 C11 Q5 Q6 Si7860DP R5 10Ω C42 0Ω R2 2.7mΩ 10X 270µF/2V C12 C13 C14 C15 C16 C17 C18 C19 C20 C21 R14 49.9Ω 6X 10µF/6.3V C24 C25 C26 C27 C28 C29 R11 49.9Ω C1 C2 2X 47µF/16 X5R 2X 100µF/6.3V C22 C23 R4 2.7mΩ C30 0Ω SCR1 S1012D -VSENSE -VO 1.1 TO 1.85V/52A +VOUT +VSENSE VIN- 12V VIN+ Evaluates MAX5037 JP5 1 2 HEADER 2 PIN MAX5037 Evaluation Kit Figure 18. MAX5037 EV Kit Schematic ______________________________________________________________________________________ 11 Evaluates MAX5037 MAX5037 Evaluation Kit EV Kit Layout 1.0" Figure 19. MAX5037 EV Kit Component Placement Guide— Component Side 1.0" Figure 21. MAX5037 EV Kit PC Board Layout—Inner Layer 2 12 1.0" Figure 20. MAX5037 EV Kit PC Board Layout—Component Side 1.0" Figure 22. MAX5037 EV Kit PC Board Layout—Inner Layer 3 ______________________________________________________________________________________ MAX5037 Evaluation Kit 1.0" 1.0" Figure 23. MAX5037 EV Kit PC Board Layout—Solder Side Figure 24. MAX5037 EV Kit Component Placement Guide— Solder Side 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 ____________________ 13 © 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. Evaluates MAX5037 EV Kit Layout (continued)