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MAX1917 Evaluation Kit

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MAX1917 Evaluation Kit 19-2491; Rev 0; 7/02 MAX1917 Evaluation Kit General Description Features Evaluates: MAX1917 The MAX1917 evaluation kit (EV kit) demonstrates the ♦ Automatically Sets VTT and VTTR to 1/2 VDDR MAX1917’s standard 7A application circuit. This DC-DC ♦ ±1% Output Voltage Accuracy converter provides a complete power-management solu- tion for DDR memory. This EV kit is a fully assembled ♦ 2.5V to 14V Input Voltage Range and tested circuit board. The MAX1917 EV kit generates ♦ 7A Output Current Capability a regulated voltage for VTT and VTTR that is half the ♦ voltage at the DDR input. The input voltage range is Sourcing and Sinking Current 2.5V to 14V. The circuit is configured to deliver 7A of ♦ 550kHz Switching Frequency output current. The DC-DC converter uses buck topology ♦ 16-Pin QSOP Package with synchronous rectification to achieve low output voltage with greater than 90% efficiency. The converter ♦ Low-Profile Components output is capable of sourcing and sinking current. Sink ♦ Fully Assembled and Tested capabilities at low voltage arise from the use of a syn- chronous rectifier, which allows the inductor current to Ordering Information reverse. The EV kit operates at 550kHz switching fre- quency and has superior load-transient response that PART TEMP RANGE IC PACKAGE meets JEDEC specifications for DDR memory. MAX1917EVKIT 0°C to +70°C 16 QSOP Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION 10µF, 25V X5R ceramic capacitors JU2, JU3 2 2-pin headers (1812) C1, C2, C3 3 JU4 1 Not installed Taiyo Yuden TMK432BJ106KM or 0.8µH, 16A power inductor TDK C4532X5R1E106M L1 1 Sumida CDEP105L-0R8 C4, C5 0 Not installed, E case N-channel MOSFETs (8-pin SO) N1, N2 2 270µF, 2V, 15mΩ low-ESR specialty International Rectifier IRF7811W C6–C9 4 polymer capacitors, E case N-channel MOSFET (SOT23) Q1 1 Panasonic EEFUE0E271R Central Semiconductor 2N7002 10µF, 6.3V X5R ceramic capacitors Not installed, complementary (1206) C10, C11 2 Q2 0 P-N MOSFETs (SC-89) Taiyo Yuden JMK212BJ106MG or Siliconix Si1029X TDK C3216X5R0J106M R1, R5, R7 0 Not installed (0805) 0.47µF, 25V X5R ceramic capacitor R2 1 5.1kΩ ±5% resistor (0805) C12 1 (1206) Taiyo Yuden TMK316BJ474ML R3 1 100kΩ ±5% resistor (0805) 0.002Ω ±1%, 1W resistor (2512) 0.47µF, 6.3V X5R ceramic capacitors R4 1 C13, C14 2 (0603) Panasonic ERJM1WTF2M0U Taiyo Yuden JMK107BJ474MA R6 1 10kΩ ±5% resistor (0805) 4.7µF, 6.3V X5R ceramic capacitor R8 0 Not installed (short PC trace) (0805) C15 1 (0805) R9 1 20Ω ±5% resistor (0805) Taiyo Yuden JMK212BJ475MG 1µF, 6.3V X5R ceramic capacitors U1 1 MAX1917EEE (16-pin QSOP) C16, C17 2 (0603) None 3 Shunts Taiyo Yuden JMK107BJ105MA Rubber bumpers 100mA Schottky diode None 4 3M SJ-5007 D1 1 Central Semiconductor CMPSH-3 Mouser 517-SJ-5007BK or equivalent Scope probe connector None 1 MAX1917 PC board J1 1 Berg Electronics 33JR135-1 None 1 MAX1917 data sheet JU1 1 3-pin header None 1 MAX1917 EV kit data sheet ________________________________________________________________ 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 Component Suppliers SUPPLIER PHONE FAX WEBSITE Central Semiconductor 516-435-1110 516-435-1824 www.centralsemi.com International Rectifier 310-322-3331 310-322-3332 www.irf.com Panasonic 714-373-7334 714-373-7323 www.panasonic.com Taiyo Yuden 408-573-4150 408-573-4159 www.t-yuden.com TDK 847-390-4373 847-390-4428 www.component.tdk.com Note: Please indicate that you are using the MAX1917 when contacting these component suppliers. Quick Start Jumper Settings Tables 1-4 show jumper settings. The following equipment is needed: • 2.5V to 14V power supply (VIN), battery, or notebook Table 1. Jumper JU1 Functions (POK) AC adapter SHUNT LOCATION POK PIN • DC-bias power supply (V+), 5.5V to 14V at 100mA Connected to VLOGIC through pullup 1 and 2 • Dummy load capable of sourcing/sinking 7A resistor R3 Evaluates: MAX1917 Connected to VL through pullup • Digital multimeter (DMM) 2 and 3 resistor R3 • 100MHz dual-trace oscilloscope The MAX1917 EV kit is a fully assembled and tested Table 2. Jumper JU2 Functions surface-mount board. Follow the steps below to verify board operation. Do not turn on the power supply (Switching-Frequency Selection) until all connections are completed: JU2 FSEL PIN FREQUENCY (kHz) 1) Ensure that the circuit is connected correctly to the Not Installed Floating 300 supplies and dummy load prior to applying any Installed Connected to GND 550 (as shipped) power. 2) Verify that the shunts are across JU1 pins 2 and 3, Table 3. Jumper JU3 Functions (Fixed/ JU2, and JU3, and not JU4. Adjustable Current-Limit Selection) 3) Apply external reference to the DDR pad. SHUNT CURRENT-LIMIT 4) Turn on power supplies and observe the output with ILIM PIN LOCATION THRESHOLD the DMM and/or oscilloscope. Look at the LX Connected to VL. switching node and MOSFET gate-drive signals ON 100mV (default) while varying the load current. Connected to GN D Detailed Description throug h resi stor R1 (not pr ovi ded ) . Refer The MAX1917 EV kit provides a complete power-man- to the Over cur rent Adjustable current OFF agement solution for DDR memory. The EV kit is a syn- Pr otection section i n limit chronous, buck-switching, DC-DC converter that the MAX 1917 data generates half the voltage at the DDR input pad for VTT sheet for infor mati on and VTTR. The synchronous rectification mode ensures on selecti ng R1. 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. Table 4. Jumper JU4 Functions (V+) SHUNT V+ VOLTAGE V+ PIN LOCATION RANGE (V) ON Connected to VL 4.5 to 5.5 OFF Not connected to VL 5.5 to 14 2 _______________________________________________________________________________________ MAX1917 Evaluation Kit Evaluates: MAX1917 C12 V+ 0.47μF 5.5V TO 14V 25V VLOGIC 1 JU1 3 VL 2 VIN GND JU4 10 VL R3 V+ 2.5V TO 14V 100kΩ 11 VL C1 C2 C3 POK C15 3 4.7μF 10μF 10μF 10μF GND POK D1 R9 6.3V 25V 25V 25V DDR 20Ω 2 14 DDR BST C17 C14 68 R5 VIN 1μF 5 7 0.47μF OPEN 6.3V 6.3V 15 4 N1 4 DH J1 R2 3 5 12 6 5.1kΩ Q2-A L1 R4 OPEN 3 1 EN/HSD 0.8μH 0.002Ω 2 Q2-B 16 1 3 LX OPEN U1 68 C4 C5 C6 C7 EN Q1 5 7 1 REF OPEN OPEN 270μF 270μF MAX1917 2V 2V 2 12 4 N2 DL R6 3 12 R7 REF 2V 10kΩ 7 13 OPEN REF PGND C13 0.47μF VOUT 9 6.3V VTT VL R8 VTTR SHORT JU3 5 9 ILIM VTTR (PC TRACE) C8 C9 C10 C11 μ μ μ μ 6 C16 270 F 270 F 10 F 10 F PGND R1 FSEL 1μF 2V 2V 6.3V 6.3V OPEN 6.3V JU2 GND 8 FLOAT = 300kHz GND = 550KHz Figure 1. MAX1917 EV Kit Schematic _______________________________________________________________________________________ 3 MAX1917 Evaluation Kit Evaluates: MAX1917 Figure 2. MAX1917EV Kit Component Placement Guide— Figure 3. MAX1917 EV Kit PC Board Layout—Component Side 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 © 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products..
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