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19-2491; Rev 0; 7/02
MAX1917 Evaluation Kit
General Description
The MAX1917 evaluation kit (EV kit) demonstrates the MAX1917's standard 7A application circuit. This DC-DC converter provides a complete power-management solution for DDR memory. This EV kit is a fully assembled and tested circuit board. The MAX1917 EV kit generates a regulated voltage for VTT and VTTR that is half the voltage at the DDR input. The input voltage range is 2.5V to 14V. The circuit is configured to deliver 7A of output current. The DC-DC converter uses buck topology with synchronous rectification to achieve low output voltage with greater than 90% efficiency. The converter output is capable of sourcing and sinking current. Sink capabilities at low voltage arise from the use of a synchronous rectifier, which allows the inductor current to reverse. The EV kit operates at 550kHz switching frequency and has superior load-transient response that meets JEDEC specifications for DDR memory. o 1% Output Voltage Accuracy o 2.5V to 14V Input Voltage Range o 7A Output Current Capability o Sourcing and Sinking Current o 550kHz Switching Frequency o 16-Pin QSOP Package o Low-Profile Components o Fully Assembled and Tested
Features
o Automatically Sets VTT and VTTR to 1/2 VDDR
Evaluates: MAX1917
Ordering Information
PART MAX1917EVKIT TEMP RANGE 0C to +70C IC PACKAGE 16 QSOP
Component List
DESIGNATION QTY DESCRIPTION 10F, 25V X5R ceramic capacitors (1812) Taiyo Yuden TMK432BJ106KM or TDK C4532X5R1E106M Not installed, E case 270F, 2V, 15m low-ESR specialty polymer capacitors, E case Panasonic EEFUE0E271R 10F, 6.3V X5R ceramic capacitors (1206) Taiyo Yuden JMK212BJ106MG or TDK C3216X5R0J106M 0.47F, 25V X5R ceramic capacitor (1206) Taiyo Yuden TMK316BJ474ML 0.47F, 6.3V X5R ceramic capacitors (0603) Taiyo Yuden JMK107BJ474MA 4.7F, 6.3V X5R ceramic capacitor (0805) Taiyo Yuden JMK212BJ475MG 1F, 6.3V X5R ceramic capacitors (0603) Taiyo Yuden JMK107BJ105MA 100mA Schottky diode Central Semiconductor CMPSH-3 Scope probe connector Berg Electronics 33JR135-1 3-pin header DESIGNATION JU2, JU3 JU4 L1 N1, N2 Q1 QTY 2 1 1 2 1 DESCRIPTION 2-pin headers Not installed 0.8H, 16A power inductor Sumida CDEP105L-0R8 N-channel MOSFETs (8-pin SO) International Rectifier IRF7811W N-channel MOSFET (SOT23) Central Semiconductor 2N7002 Not installed, complementary P-N MOSFETs (SC-89) Siliconix Si1029X Not installed (0805) 5.1k 5% resistor (0805) 100k 5% resistor (0805) 0.002 1%, 1W resistor (2512) Panasonic ERJM1WTF2M0U 10k 5% resistor (0805) Not installed (short PC trace) (0805) 20 5% resistor (0805) MAX1917EEE (16-pin QSOP) Shunts Rubber bumpers 3M SJ-5007 Mouser 517-SJ-5007BK or equivalent MAX1917 PC board MAX1917 data sheet MAX1917 EV kit data sheet
C1, C2, C3 C4, C5 C6-C9
3 0 4
C10, C11
2
Q2 R1, R5, R7 R2 R3 R4 R6 R8 R9 U1 None None None None None
0 0 1 1 1 1 0 1 1 3 4 1 1 1
C12
1
C13, C14
2
C15
1
C16, C17 D1 J1 JU1
2 1 1 1
________________________________________________________________ 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.
MAX1917 Evaluation Kit Evaluates: MAX1917
Component Suppliers
SUPPLIER Central Semiconductor International Rectifier Panasonic Taiyo Yuden TDK PHONE 516-435-1110 310-322-3331 714-373-7334 408-573-4150 847-390-4373 FAX 516-435-1824 310-322-3332 714-373-7323 408-573-4159 847-390-4428 WEBSITE www.centralsemi.com www.irf.com www.panasonic.com www.t-yuden.com www.component.tdk.com
Note: Please indicate that you are using the MAX1917 when contacting these component suppliers.
Quick Start
The following equipment is needed: * 2.5V to 14V power supply (VIN), battery, or notebook AC adapter * DC-bias power supply (V+), 5.5V to 14V at 100mA * Dummy load capable of sourcing/sinking 7A * Digital multimeter (DMM) * 100MHz dual-trace oscilloscope The MAX1917 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) Ensure that the circuit is connected correctly to the supplies and dummy load prior to applying any power. 2) Verify that the shunts are across JU1 pins 2 and 3, JU2, and JU3, and not JU4. 3) Apply external reference to the DDR pad. 4) Turn on power supplies and observe the output with the DMM and/or oscilloscope. Look at the LX switching node and MOSFET gate-drive signals while varying the load current.
Jumper Settings
Tables 1-4 show jumper settings.
Table 1. Jumper JU1 Functions (POK)
SHUNT LOCATION 1 and 2 2 and 3 POK PIN Connected to VLOGIC through pullup resistor R3 Connected to VL through pullup resistor R3
Table 2. Jumper JU2 Functions (Switching-Frequency Selection)
JU2 Not Installed Installed FSEL PIN Floating Connected to GND FREQUENCY (kHz) 300 550 (as shipped)
Table 3. Jumper JU3 Functions (Fixed/ Adjustable Current-Limit Selection)
SHUNT LOCATION ON ILIM PIN Connected to VL. Connected to GND through resistor R1 (not provided). Refer to the Overcurrent Protection section in the MAX1917 data sheet for information on selecting R1. CURRENT-LIMIT THRESHOLD 100mV (default)
Detailed Description
The MAX1917 EV kit provides a complete power-management solution for DDR memory. The EV kit is a synchronous, buck-switching, DC-DC converter that generates half the voltage at the DDR input pad for VTT and VTTR. The synchronous rectification mode ensures balanced sourcing and sinking current capability up to 7A. The EV kit operates at 550kHz switching frequency and has superior line- and load-transient response.
OFF
Adjustable current limit
Table 4. Jumper JU4 Functions (V+)
SHUNT LOCATION ON OFF V+ PIN Connected to VL Not connected to VL V+ VOLTAGE RANGE (V) 4.5 to 5.5 5.5 to 14
2
_______________________________________________________________________________________
MAX1917 Evaluation Kit Evaluates: MAX1917
C12 0.47F 25V
V+ 5.5V TO 14V
VLOGIC
1 JU1 3 2
VL 10 V+ VL 3 POK DDR BST 14 C14 0.47F 6.3V 6 4 1 1 3 EN/HSD LX U1 5 7 8 JU4 11 D1 C15 4.7F 6.3V C1 10F 25V C2 10F 25V C3 10F 25V VL VIN 2.5V TO 14V GND
GND R3 100k POK DDR R5 OPEN 4 6 5 Q2-A OPEN 2 EN R9 20 VIN C17 1F 6.3V R2 5.1k
2
DH
15
N1 2 3 L1 0.8H R4 0.002 C4 OPEN C5 OPEN C6 270F 2V
J1
1
3 Q2-B OPEN 1
16 6 12 4 1 5 7 8 REF N2 2 3
Q1 2
MAX1917
DL
C7 270F 2V
REF 2V
R6 10k 7 C13 0.47F 6.3V REF PGND 13
R7 OPEN VOUT R8 SHORT (PC TRACE)
VTT 5
9 VTTR C16 1F 6.3V
VL JU3 R1 OPEN ILIM FSEL GND 8 VTTR 9
6 JU2
C8 270F 2V
C9 270F 2V
C10 10F 6.3V
C11 10F 6.3V
PGND
FLOAT = 300kHz GND = 550KHz
Figure 1. MAX1917 EV Kit Schematic
_______________________________________________________________________________________
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MAX1917 Evaluation Kit Evaluates: MAX1917
Figure 2. MAX1917EV Kit Component Placement Guide-- Component Side
Figure 3. MAX1917 EV Kit PC Board Layout--Component Side
Figure 4. MAX1917 EV Kit PC Board Layout--Ground Plane
Figure 5. MAX1917 EV Kit PC Board Layout--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.
4 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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