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19-3341; Rev 0; 7/04
MAX8537 Evaluation Kit
General Description
The MAX8537 evaluation kit (EV kit) is a fully assembled and tested circuit board that demonstrates the MAX8537 dual, out-of-phase, PWM synchronous buck controller. The EV kit is a complete power-management solution for a double-date-rate (DDR) memory supply. It generates the main memory voltage (VDDQ), the tracking sinking/ sourcing termination voltage (VTT), and the reference voltage (VTTR). The EV kit takes a 12V input voltage and converts the voltage down to 2.5V for the VDDQ supply, 1.25V for the VTT supply, and 1.25V for the VTTR reference. The 2.5V (VDDQ) supply is capable of sourcing 20A, the 1.25V (VTT) supply is capable of sinking/sourcing 8A, and VTTR is capable of sinking/sourcing 15mA. Out-of-Phase Operation 90% Efficiency 400kHz Switching Frequency Independent POK_ and EN_ for Flexible Sequencing Adjustable Soft-Start and Soft-Stop for Each Output Lossless Adjustable Hiccup Current Limit Output Overvoltage Protection 28-Pin QSOP Package Fully Assembled and Tested
Features
Complete DDR Supplies: VDDQ, VTT, and VTTR
Evaluates: MAX8537
Ordering Information
PART MAX8537EVKIT TEMP RANGE 0C to +70C IC PACKAGE 28 QSOP
Component List
DESIGNATION QTY C1, C3, C26, C28, C29 5 DESCRIPTION 1000F 20%, 25V, 12.5mm x 20mm, aluminum electrolytic capacitors Panasonic EEUFC1E102B Sanyo 25MV1000AX 10F 20%, 25V X5R (1210) ceramic capacitors Taiyo Yuden TMK325BJ106MM 0.47F 10%, 10V X5R (0603) ceramic capacitors Taiyo Yuden LMK107BJ474KA TDK C1608X5R1A474K 0.01F 20%, 50V X7R (0603) ceramic capacitors Kemet C0603C103M5RAC Taiyo Yuden UMK107B103MZ TDK C1608X7R1H103K Not installed (0603) 680F, 2.5V, 6m, D4-size POSCAPs Sanyo 2R5TPD680M6 220F, 4V, 5m, E-size SP-caps Panasonic EEFSE0G221R C17, C19, C39, C42 4 DESIGNATION QTY C13 1 DESCRIPTION 10F 20%, 6.3V X5R (0805) ceramic capacitor Taiyo Yuden JMK212BJ106MG TDK C2012X5R0J106M 1F 10%, 25V X7R (1206) ceramic capacitor Kemet C1206C105K3RAC Murata GRM31MR71E105K TDK C3216X7R1E105K 1F 10%, 10V X5R (0603) ceramic capacitor Murata GRM188R61A105K TDK C1608X5R1A105K 1F 10%, 16V X7R (0805) ceramic capacitor Kemet C0805C105K4RAC Murata GRM21BR71C105K TDK C2012X7R1C105K 1500pF 20%, 25V X7R (0603) ceramic capacitors Kemet C0603C152M3RAC
C2, C4
2
C14
1
C5, C6
2
C15
1
C7, C10, C23, C24 C8, C9, C35, C41 C11, C30, C31, C32 C12, C36
4
C16
1
0 4 2
________________________________________________________________ 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.
MAX8537 Evaluation Kit Evaluates: MAX8537
Component List (continued)
DESIGNATION QTY C18 1 DESCRIPTION 6.8pF 5%, 50V C0G (0603) ceramic capacitor Kemet C0603C689M5GAC 39pF 5%, 50V C0G (0603) ceramic capacitor Kemet C0603C390M5GAC TDK C1608C0G1H390J 3900pF 20%, 10V X7R (0603) ceramic capacitor Kemet C0603C392M8RAC 820pF 20%, 10V X7R (0603) ceramic capacitor Kemet C0603C821M8RAC 220pF 5%, 50V C0G (0603) ceramic capacitor Kemet C0603C221J5GAC Murata GRM1885C1H221J TDK C1608C0G1H221J Not installed, 12.5mm x 20mm Not installed, E-size 2200pF 20%, 25V X7R (0603) ceramic capacitor Kemet C0603C222M3RAC Schottky diode, 0.1A, 30V SOD-323 Central Semiconductor CMDSH-3 (top mark = S1) 3-pin headers, 0.1in center Not installed, 2-pin headers, 0.1in center 0.9H, 25A, 1.15m inductor BI Technologies HM73-40R90 TOKO FDH1065-R91M 0.8H, 16A, 2.33m inductor Panasonic ETQP3H0R8BFA MOSFET, n-channel, 30V, 8.3A, 17m, SO-8 International Rectifier IRF7807V Not installed, SO8 MOSFETs, n-channel, 30V, 13.6A, 9.5m, SO-8 International Rectifier IRF7821 MOSFETs, n-channel, 30V, 20A, 4.8m, SO-8 International Rectifier IRF7832 Not installed, SOT223 Fairchild PZT3906 Not installed (2512) 1.69k 1% (0603) resistor DESIGNATION QTY DESCRIPTION R3 1 1.05k 1% (0603) resistor R4 0 Not installed (2512) R5, R6, R19, 4 100k 5% (0603) resistors R20 R7 1 2.2 5% (0603) resistor R8 1 4.7 5% (0603) resistor R9 1 51.1k 1% (0603) resistor R10 1 30.1k 1% (0603) resistor R11 1 110k 5% (0603) resistor R12 1 2.7k 5% (0603) resistor R13 1 1.2k 5% (0603) resistor R14 1 22k 5% (0603) resistor R15 1 21.5k 1% (0603) resistor R16, R17, R18 3 10k 1% (0603) resistors R21, R26 2 4.7 5% (1206) resistors R22 1 2.0 5% (1206) resistor R23, R24, R25, 0 Not installed (0603) R31, R32 R27, R28 2 1.0 5% (0603) resistors R29 R30 2 0 0 5% (0603) resistors
C20
1
C21
1
C22
1
C25
1
C27 C33, C34, C37, C38 C40
0 0 1
Quick Start
Recommended Equipment
Before beginning, the following equipment is recommended: * 12V, 10A DC power supply * Three voltmeters
D1, D2 JU1-JU4 JU5, JU6, JU7
2 4 0
Procedure
The MAX8537 EV kit is a fully assembled and tested surface-mount board. Follow the steps below to verify board operation. Do not turn on the power supply until all connections are completed: 1) Set jumper JU1 to position 1-2. 2) Set jumper JU2 to position 1-2. 3) Set jumper JU3 to position 1-2 to enable VOUT2. 4) Set jumper JU4 to position 1-2 to enable VOUT1. 5) Connect the 12V supply across the VIN and PGND pads. 6) Connect a voltmeter across the VOUT1 and PGND pads. 7) Connect a voltmeter across the VOUT2 and PGND pads. 8) Connect a voltmeter across the VTTR and AGND pads.
2 ___________________________________
L1 L2 N1 N2, N5 N3, N4, N6
1 1 1 0 3
N7, N8 Q1 R1 R2
2 0 0 1
MAX8537 Evaluation Kit Evaluates: MAX8537
Table 1. Jumpers Selection
JUMPER JUMPER POSITON 1-2* 2-3 JU2 1-2* 2-3 1-2* JU3 2-3 Open 1-2* JU4 2-3 Open FUNCTION Output Current-Limit Setting for VOUT2. Connects ILIM2 to the drain of the high-side MOSFET (N1/N2) for lossless sensing. Connects ILIM2 to the current-sense resistor (R1) for more accurate sensing. Output Current-Limit Setting for VOUT1. Connects ILIM1 to the drain of the high-side MOSFET (N3/N4) for lossless sensing. Connects ILIM1 to the current-sense resistor (R4) for more accurate sensing. Enables VOUT2. Disables VOUT2. Drive pad EN2 with an external logic signal. Enables VOUT1. Disables VOUT1. Drive pad EN1 with an external logic signal.
JU1
*Default position.
9) Turn on the power supply. 10) Verify that the VOUT1 voltage is 2.5V. 11) Verify that the VOUT2 voltage is 1.25V. 12) Verify that the VTTR voltage is 1.25V.
selecting R23, the resistor from FB2 to GND, between 5k and 15k. Then calculate R10 by: R10 = R23 x [(VOUT2 / REFIN) -1] Note: REFIN is set to 1/2 x VOUT1 by resistor-divider R17/R18. Note: When changing output voltages, it may be necessary to choose new inductor and capacitor values. Refer to the Inductor Selection and Output Capacitor sections of the MAX8537/MAX8538/MAX8539 data sheet for more information.
Detailed Description
The MAX8537 EV kit demonstrates the MAX8537 dual, out-of-phase, PWM synchronous buck controller. The EV kit is a complete power-management solution for a DDR supply. It generates the main memory voltage (VDDQ), the tracking sinking/sourcing termination voltage (VTT), and the reference voltage (VTTR). The EV kit takes a 12V input voltage and converts the voltage down to 2.5V for the VDDQ supply, 1.25V for the VTT supply, and 1.25V for the VTTR reference. The 2.5V (VDDQ) supply is capable of sourcing 20A, the 1.25V (VTT) supply is capable of sinking/sourcing 8A, and VTTR is capable of sinking/sourcing 15mA.
Current Limits (ILIM1 and ILIM2)
The MAX8537 senses the peak inductor current either through the on-resistance of the high-side MOSFET for lossless sensing or with a series resistor for more accurate sensing. Jumper JU1, position 1-2, connects ILIM2 to the drain of the high-side MOSFET for lossless sensing; position 2-3 connects ILIM2 to the current-sense resistor (R1) for more accurate sensing. Jumper JU2, position 1-2, connects ILIM1 to the drain of the highside MOSFET for lossless sensing; position 2-3 connects ILIM1 to the current-sense resistor (R4) for more accurate sensing. The MAX8537 is set up for lossless current sensing. To use current-sense resistors, cut the shorts across R1 and R4 and remove R29, R30, C7, and C10. Install R1, R4, R24, R25, R31, R32, C8, C9, C35, and C41. Use R29 and R30 for R31 and R32. Connect jumpers JU1 and JU2 in the 2-3 positions. Refer to the Current Limit section of the MAX8537/MAX8538/MAX8539 data sheet for more information.
3
Output-Voltage Setting (VOUT1 and VOUT2)
The resistor-divider formed by R15 and R16 sets VOUT1. The MAX8537 EV kit is shipped with the divider set so VOUT1 equals 2.5V. Change the voltage by selecting R16, the resistor from FB1 to GND, between 5k and 15k. Then calculate R15 by: R15 = R16 x [(VOUT1 / 0.8) -1] The resistor-divider formed by R10 and R23 sets VOUT2. The MAX8537 EV kit is shipped with the divider set so VOUT2 equals 1.25V. Change the voltage by
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MAX8537 Evaluation Kit Evaluates: MAX8537
Component Suppliers
SUPPLIER BI Technologies Central Semiconductor International Rectifier (IRF) Kemet Murata Panasonic Sanyo Taiyo Yuden TDK TOKO PHONE 714-447-2300 631-435-1110 310-322-3331 864-963-6300 770-436-1300 714-373-7366 619-661-6835 800-348-2496 847-803-6100 847-297-0070 FAX 714-447-2400 631-435-1824 310-726-8721 864-963-6322 770-436-3030 714-737-7323 619-661-1055 847-925-0899 847-390-4405 847-699-1194 WEBSITE www.bitechnologies.com www.centralsemi.com www.irf.com www.kemet.com www.murata.com www.panasonic.com www.sanyo.com www.t-yuden.com www.component.tdk.com www.tokoam.com
Note: Indicate you are using the MAX8537 when contacting these component suppliers.
Output Enables (EN1 and EN2)
Outputs of the MAX8537 can be turned on and off independently at EN1 and EN2. Jumper JU3, position 1-2, pulls EN2 high to turn on VOUT2; position 2-3 pulls EN2 low to turn off VOUT2. Jumper JU4, position 1-2, pulls EN1 high to turn on VOUT1; position 2-3 pulls EN1 low to turn off VOUT1.
4
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MAX8537 Evaluation Kit Evaluates: MAX8537
VIN
VIN
JU5
JU6 C1 1000F 25V
JU7 C26 1000F 25V C27 OPEN VIN2_OPTION C2 10F 25V C5 0.47F LX2 DH2 R29 0 LX2 R27 1 D1 1
C3 1000F 25V
C28 1000F 25V
C29 1000F 25V
C4 10F 25V
VIN2_OPTION
VL D2 28 27 LX1 LX1 LX2 C9 OPEN C8 OPEN 4 6 ILIM1 25 26 C10 0.01F VIN 1 2 3 JU2 R25 OPEN C35 OPEN 56 23 4 12 R4 SHORT R32 OPEN L1 0.9H 78 N7 3 R22 2.0 4 12 56 78 N8 3 VOUT1 2.5V (VDDQ) C6 0.47F 56 R28 1 DH1 R30 0 4 12
PGND 87 AGND N1 3 LX2 L2 0.8H 87 N5 OPEN 3 21 65 4 R31 OPEN 21 65 4 C42 1500pF 3 DH2 R26 4.7 87
65
LX1
78 N3 DH1 3 4
56
78 N4
N2 OPEN 4
BST2
BST1 DH1
2 3
21
DH2
12
3
R1 SHORT
R24 OPEN C41 OPEN 65 4 21
C7 VIN2_OPTION 0.01F R2 1.69k 1%
LX1
1 87 R21 N6 4.7 C39 1500pF 3 JU1 3 2
R3 1.05k 1%
ILIM2 DL2
POK1 R6 100k VL R5 100k
U1 MAX8537
5
DL1 POK1
C40 2200pF
VL POK2 R19 100k VL EN2 R20 100k VL EN1 1 2 JU3 8 3 AVL 9 EN1 VTTR 10 FREQ 18 C20 39pF 12 R23 OPEN C23 0.01F 13 R17 10k 1% SS2 FB2 FB1 SS1 17 16 C24 0.01F 19 C16 1F C21 3900pF COMP2 COMP1 R14 22k 20 C15 1F VTTR AGND R13 1.2k R15 21.5k 1% R16 10k 1% C22 820pF 21 C14 1F R8 4.7 7 POK2 VL 22 2 C13 10F 1 EN2 V+ 3 Q1 OPEN R7 2.2 VIN C36 220F C12 220F
C11 680F
C30 680F
C31 680F
C32 680F
VL
C38 OPEN
C37 OPEN
1 2 JU4 3 R9 51.1k 1%
PGND
VOUT2 (VTT) 1.25V
C33 OPEN
C34 OPEN R10 30.1k 1% R11 110k C17 1500pF
11 C18 6.8pF
PGND
C19 1500pF
R12 2.7k
GND 14 REFIN R18 10k 1% PGND
15 24
C25 220pF
Figure 1. MAX8537 EV Kit Schematic _______________________________________________________________________________________ 5
MAX8537 Evaluation Kit Evaluates: MAX8537
Figure 2. MAX8537 EV Kit Component Placement Guide--Component Side 6 _______________________________________________________________________________________
MAX8537 Evaluation Kit Evaluates: MAX8537
Figure 3. MAX8537 EV Kit PC Board Layout--Component Side
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7
MAX8537 Evaluation Kit Evaluates: MAX8537
Figure 4. MAX8537 EV Kit PC Board Layout--GND Layer 8 _______________________________________________________________________________________
MAX8537 Evaluation Kit Evaluates: MAX8537
Figure 5. MAX8537 EV Kit PC Board Layout--PGND Layer
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9
MAX8537 Evaluation Kit Evaluates: MAX8537
Figure 6. MAX8537 EV Kit PC Board Layout--Solder Side 10 ______________________________________________________________________________________
MAX8537 Evaluation Kit Evaluates: MAX8537
Figure 7. MAX8537 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 ____________________ 11 (c) 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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