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19-2782; Rev 0; 2/03
MAX5037 Evaluation Kit
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(R) 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.
Features
o Designed to Meet VRM 9.0 Mechanical and Electrical Specifications o Two-Phase Power Conversion o 5V or 12V Input Operation (Design Optimized for 12V Input) o Output Voltage Programmable from 1.1V to 1.85V in 25mV Step-Through VID Input o VRM 9.0-Compliant Integrated 5-Bit DAC o 52A Output Current o Adaptive Voltage Positioning for Optimized Transient Response o Average Current-Mode Control for Superior Current Sharing o Current-Sharing Accuracy Within 5% Between Parallel Channels o Up to 95% Efficiency o 500kHz Effective Switching Frequency (Two Phases) o Output Overload Protection o Output Overvoltage Crowbar Protection o Internal Undervoltage Lockout and Startup Circuit o Excellent Line-and-Load Transient Response o Phase Failure Detector o Multiple-Phase Synchronization Between Parallel Modules o VRM 9.0-Compliant EDGE Connector
Evaluates MAX5037
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 C1, C2 2 DESCRIPTION 47F 20%, 16V X5R ceramic capacitors (2220) TDK C5750X5R1C476M 22F 20%, 16V X5R ceramic capacitors (1812) TDK C4532X5R1C226M 270F, 2V, 15m low-ESR specialty capacitors Panasonic EEFUE0D271R 100F 10%, 6.3V ceramic capacitors (2220) Murata GRM55FR60J107KA01L 10F 20%, 6.3V X5R ceramic capacitors (0805) TDK C2012X5R0J106M 0 resistors (0603) 0.01F 5%, 50V X7R ceramic capacitors (0603) Murata GRM188R71H103KA01
C3-C11
9
Ordering Information
PART MAX5037EVKIT TEMP RANGE 0C to +60C IC PACKAGE 44 QFN
C12-C21
10
C22, C23
2
C24-C29 C30, C42 C31, C35, C37
6 2 3
________________________________________________________________ Maxim Integrated Products
1
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.
MAX5037 Evaluation Kit Evaluates MAX5037
Component List (continued)
DESIGNATION QTY C32, C41 2 DESCRIPTION 0.47F 10%, 16V capacitors (0805) TDK C1608X5R1A474K 470pF 5%, 16V COG ceramic capacitors (0603) Murata GRM1885C1H471JAB01 4700pF 5%, 16V X7R ceramic capacitor (0603) Vishay VJ0603Y471JXJ 0.1F 10%, 16V X7R ceramic capacitors (0603) Murata GRM188R71C104KA01 1F, 10V Y5V ceramic capacitor (0603) Murata GRM188F51A105 4.7F 10%, 16V X7R ceramic capacitor (0805) Murata GRM40-034X5R475K6.3 Not installed Schottky diodes ON Semi MBRS340T3 Schottky diodes ON Semi MBR0520LT1 Surface-mount flatback heatsinks AAVID NP973541 3-pin headers Digi-Key S1012-03-ND 2-pin header Digi-Key S1012-02-ND DESIGNATION QTY L1, L2 2 DESCRIPTION 0.6H 10% power inductors, 13mm x 13mm Panasonic ETQP1H0R6BFX MOSFETs PowerPAK SO-8 Vishay-Siliconix Si7860DP MOSFETs PowerPAK SO-8 Vishay-Siliconix Si7886DP 0.0027 resistors (2512) Panasonic ERJM1WSF2M7U 10 1% resistor (0603) Not installed 3.3 1% resistors (0805) 2.2 1% resistor (0805) 7.5k 1% resistor (0603) 1k 1% resistors (0603) 49.9 1% resistors (0603) 0 1% resistors (0805) 0 1% resistors (0603) 1 1% resistor (0603) 37.4k 1% resistors (0603) 4.99k 1% resistor (0603) 10k 1% resistor (0603) SCR 200V, 12A D-Pack Teccor S2012D MAX5037ETH, dual-phase controller (44-pin QFN) Shunts, JP3-2/3, JP4-2/3 Digi-Key SD9000-ND
C33, C36, C38
3
Q1, Q2, Q5, Q6 Q3, Q4, Q7, Q8 R1-R4 R5 R6, R19, R21 R7, R15 R8 R9 R10, R18 R11, R14 R12, R20 R13, R16 R17 R22, R23 R24 R25 SCR1 U1 None
4 4 4 1 3 2 1 1 2 2 2 2 1 2 1 1 1 1 2
C34
1
C39, C44, C45
3
C40
1
C43 CON1 D1, D2 D3, D4 HS1, HS2 JP3, JP4 JP5
1 0 2 2 2 2 1
2
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MAX5037 Evaluation Kit
Component Suppliers
SUPPLIER AAVID Thermalloy Murata ON Semiconductor Panasonic TDK Teccor Vishay PHONE 603-224-9988 770-436-1300 602-244-6600 714-373-7939 847-803-6100 972-580-7777 402-563-6866 FAX 603-223-1790 770-436-3030 602-244-3345 714-373-7183 847-390-4405 972-550-1309 402-563-6296 WEBSITE www.aavidthermalloy.com www.murata.com www.on-semi.com www.panasonic.com www.tdk.com www.teccor.com www.vishay.com
Evaluates MAX5037
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.
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 2200F/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 1. 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.
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 2200F/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 1. 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.
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).
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MAX5037 Evaluation Kit Evaluates MAX5037
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/s 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 = 0C to +60C (with 400LFM airflow)
Table 1. Output Voltage vs. DAC Codes
VID INPUTS (0 = Connected to SGND, 1 = Open Circuit) VID4 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 VID3 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 VID2 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 VID1 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 VID0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 OUTPUT VOLTAGE (V) VOUT Output off 1.100 1.125 1.150 1.175 1.200 1.225 1.250 1.275 1.300 1.325 1.350 1.375 1.400 1.425 1.450 1.475 1.500 1.525 1.550 1.575 1.600 1.625 1.650 1.675 1.700 1.725 1.750 1.775 1.800 1.825 1.850
4
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MAX5037 Evaluation Kit Evaluates MAX5037
3.80
0.25 0.25
JP3
COMPONENT SIDE
MAX5037 EV KIT
JP4
JP5
2.30
PIN 1 ON SOLDER SIDE 1 62 0.30 CON1 31 32
0.35
0.07
Figure 1. Outline Drawing of MAX5037 EV Kit
Table 2. Edge-Connector Pin Configuration
PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 FUNCTION VIN+ VIN+ VIN+ VIN+ Rsvd Key VID3 VID1 Rsvd PGOOD SENSERsvd VOVO+ VOPIN 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 FUNCTION VO+ VOVO+ VOVO+ VOVO+ VOVO+ VOVO+ VOVO+ VOVO+ PIN 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 FUNCTION VOVOVO+ VOVO+ VOVO+ VOVO+ VOVO+ VOVO+ VOVO+ VOPIN 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 FUNCTION VO+ VOVO+ VO+ Rsvd SENSE+ EN NC VID0 VID2 VID4 VRM-pres VINVINVINVIN-
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MAX5037 Evaluation Kit Evaluates MAX5037
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 2200F/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.
VCNTR + VOUT/2 VCNTR VCNTR - VOUT/2 VOLTAGE-POSITIONING WINDOW
NO LOAD
1/2 LOAD LOAD (A)
FULL LOAD
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 0.6H inductors with 0.3H 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 x R24 R24 IOUT + ( VOUT - VID) 2 x R23 x GC 0.05 RS R1 x R2 R 3 x R4 RS = = R1 + R2 R 3 + R4 GC =
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
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MAX5037 Evaluation Kit
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: R22 = R23 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: R22 = R24 x R23 V R24 + R23 x 1 - COREMAX VID
Evaluates MAX5037
OUTPUT VOLTAGE vs. ILOAD AND RCNTR
1.90 1.85 1.80 VOUT (V) RCNTR = 100k 1.75 1.70 RCNTR = 200k 1.65 1.60 0 VIN = +12V VID SETTING = +1.75V 5 10 15 20 25 30 35 40 45 50 55 ILOAD (A) RCNTR = RCNTR = 50k
Figure 4. Output Voltage vs. ILOAD and RCNTR
OUTPUT VOLTAGE vs. ILOAD AND RCNTR
1.60 1.55 1.50 VOUT (V) 1.45 1.40 1.35 1.30 1.25 1.20 0 5 10 15 20 25 30 35 40 45 50 55 ILOAD (A) RCNTR = 100k RCNTR = 200k RCNTR = RCNTR = 50k VIN = +12V VID SETTING = +1.4V
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).
Figure 5. Output Voltage vs. ILOAD and RCNTR
OUTPUT VOLTAGE vs. OUTPUT CURRENT AND ERROR AMP GAIN (RF / RIN)
VOLTAGE-POSITIONING WINDOW
1.85
VCOREMAX VID VCOREMAX - VOUT/2 VCOREMAX - VOUT
VIN = +12V VOUT = +1.8V
Rf / RIN = 15 Rf / RIN = 12.5
1.80
VOUT (V)
1.75
1.70
Rf / RIN = 7.5 Rf / RIN = 10
1.65
NO LOAD
1/2 LOAD LOAD (A)
FULL LOAD
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
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MAX5037 Evaluation Kit Evaluates MAX5037
Ripple and Noise
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.
EFFICIENCY vs. OUTPUT CURRENT AND INPUT VOLTAGE
100 90 80 70 (%) 60 50 40 30 20 10 0 0 4 8 12 16 20 24 28 32 36 40 44 48 52 IOUT (A) VOUT = +1.8V fSW = 250kHz VIN = +5V VIN = +12V
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/s slew rate of the current step.
OUTPUT RIPPLE
Figure 9. Efficiency vs. Output Current and Input Voltage
EFFICIENCY vs. OUTPUT CURRENT AND OUTPUT VOLTAGE
100 90 80 70 VOUT = +1.5V VOUT = +1.8V
VOUT (AC-COUPLED) 10mV/div
(%)
60 50 40 30
VOUT = +1.1V
VIN = +12V VOUT = +1.75V IOUT = 52A 500ns/div
20 10 0 0 4 8 12 16 20 24 28 32 36 40 44 48 52 IOUT (A) VIN = +12V fSW = 250kHz
Figure 7. Output Ripple
Figure 10. Efficiency vs. Output Current and Output Voltage
EFFICIENCY vs. OUTPUT CURRENT AND OUTPUT VOLTAGE
100 90 80 70 VOUT = +1.5V VOUT = +1.8V
LOAD-TRANSIENT RESPONSE
VOUT 50mV/div
(%)
60 50 40 30 VOUT = +1.1V
VIN = +12V VOUT = +1.75V ISTEP = 8A TO 52A tRISE = 1s 40s/div
20 10 0 0 4 8 12 16 20 24 28 32 36 40 44 48 52 IOUT (A) VIN = +5V fSW = 500kHz
Figure 8. MAX5037 EV Kit Transient Response 8
Figure 11. Efficiency vs. Output Current and Output Voltage
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MAX5037 Evaluation Kit
INPUT STARTUP RESPONSE
VPGOOD 2V/div
Turn On
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.
Evaluates MAX5037
VOUT 500mV/div
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 = xN R1// R2 For the EV kit, current limit occurs at 63A typically with RSENSE equal to 1.6m. In case of a short circuit at the output, the average output current is maintained at its current-limit value.
VIN = +12V VOUT = +1.75V IOUT = 0A 2ms/div
VIN 10V/div
Figure 12. Input Startup Response
INPUT STARTUP RESPONSE
VPGOOD 1V/div
VOUT 1V/div
VIN 5V/div VIN = +12V VOUT = +1.75V IOUT = 52A 2ms/div
External Synchronization with CLKIN and CLKOUT
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.
Figure 13. Input Startup Response
ENABLE STARTUP RESPONSE
VPGOOD 1V/div
VOUT 1V/div
VIN = +12V VOUT = +1.75V IOUT = 52A 1ms/div
VIN 2V/div
Figure 14. Enable Startup Response
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9
MAX5037 Evaluation Kit Evaluates MAX5037
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
CLKIN 5V/div
DH1 20V/div DH2 20V/div CLKOUT 5V/div
DH1 20V/div DH2 20V/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
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R5 10 4X 22F/16V X5R C8 C9 C10 C11 SCR1 S1012D C31 0.01F C1 C2 2X 47F/16 X5R 12V VINVIN+
JP5 12 HEADER 2 PIN JP4
1 HEADER 3 PIN JP3 C35 0.01F C34 4.7F R8 2.2 C32 0.47F/16V R6 OPEN L2 0.6H/27A C30 0 C33 470pF R10 1k D4 MBR0520LT1 MBRS340T3 44 43 VD4 N.C. CLP2 CSN2 CSP2 PHASE CLKOUT 1 VD3 VD2 VD1 VD0 SGND OVPIN DL2 30 29 28 27 1 C43 4.7F 2 5X 22F/ 16V X5R C3 C4 C5 C6 C7 R15 3.3 26 25 24 23 R17 1 C45 0.1F C44 0.1F LX2 31 R13 0 R12 0 DH2 32 2X 100F/6.3V C22 C23 N.C. 33 2 3 4 5 CLKIN SGND BST2 PLLCMP Q7 Q8 Si7886DP 42 41 40 39 38 37 36 35 34 D2 R3 2.7m R4 2.7m R9 7.5k 2 3 C36 470pF R7 3.3 Q5 Q6 Si7860DP
DIFF
EAN
EAOUT
REG
CSP1
CSN1
CNTR
EN
SGND
N.C.
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 HEADER 3 PIN VIN-
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
12 13 C39 0.1F D3 R21 OPEN C40 1F R16 0
14
15 16
17 18
19
20 21
22
BST1
Figure 18. MAX5037 EV Kit Schematic
2 3 1 +VSENSE R11 49.9 +VOUT 1.1 TO 1.85V/52A -VO C24 C25 C26 C27 C28 C29 6X 10F/6.3V
PC BOARD EDGE CONNECTOR
VIN+
U1
PGND IN VCC VDD DL1 LX1 DH1
C37 0.01F R18 1k 7 CLP1 OVPOUT PWRGD SENSE+ SENSE8 9 10 11 +VOUT C38 470pF 6
MAX5037
C12 C13 C14 C15 C16 C17 C18 C19 C20 C21 10X 270F/2V
R14 49.9
Q1 Q2 Si7860DP
-VSENSE
R24 4.99k R23 37.4k
C41 0.47F/16V
D1 MBRS340T3 Q3 Q4 Si7886DP R20 0
R1 2.7m
R2 2.7m
HS1 R25 10k
R22 37.4k
MBR05020LT1
L1 0.6H/27A R19 OPEN C42 0
HEATSINK-AAVIDI
HS2
Evaluates MAX5037
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HEATSINK-AAVIDI
MAX5037 Evaluation Kit
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MAX5037 Evaluation Kit Evaluates MAX5037
EV Kit Layout
1.0"
1.0"
Figure 19. MAX5037 EV Kit Component Placement Guide-- Component Side
Figure 20. MAX5037 EV Kit PC Board Layout--Component Side
1.0"
1.0"
Figure 21. MAX5037 EV Kit PC Board Layout--Inner Layer 2
Figure 22. MAX5037 EV Kit PC Board Layout--Inner Layer 3
12
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MAX5037 Evaluation Kit
EV Kit Layout (continued)
Evaluates MAX5037
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 (c) 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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