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 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 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 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 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. Evaluates: MAX1917 MAX1917 EvaluationKit and hassuperiorline-load-transientresponse. 7A. TheEVkitoperatesat550kHzswitchingfrequency balanced sourcingandsinkingcurrentcapabilityupto and VTTR.Thesynchronousrectificationmodeensures generates halfthevoltageatDDRinputpadforVTT chronous, buck-switching,DC-DCconverterthat agement solutionforDDRmemory.TheEVkitisasyn- The MAX1917EVkitprovidesacompletepower-man- Turnonpowersuppliesandobservetheoutputwith 4) ApplyexternalreferencetotheDDRpad. 3) VerifythattheshuntsareacrossJU1pins2and3, 2) Ensurethatthecircuitisconnectedcorrectlyto 1) until allconnectionsarecompleted: board operation. surface-mount board.Followthestepsbelowtoverify The MAX1917EVkitisafullyassembledandtested 100MHzdual-traceoscilloscope • multimeter(DMM) Digital • Dummyloadcapableofsourcing/sinking 7A • DC-biaspowersupply(V+), 5.5Vto14Vat100mA • 2.5Vto14Vpowersupply(VIN), battery,ornotebook • The followingequipmentisneeded: ______2 Note: D 4-9-33873042 www.component.tdk.com 847-390-4428 www.t-yuden.com www.panasonic.com 408-573-4159 714-373-7323 www.irf.com 847-390-4373 www.centralsemi.com 310-322-3332 408-573-4150 714-373-7334 516-435-1824 310-322-3331 516-435-1110 TDK Taiyo Yuden Panasonic International Rectifier Central Semiconductor AC adapter while varyingtheloadcurrent. switching nodeandMOSFETgate-drivesignals the DMMand/oroscilloscope.LookatLX JU2, andJU3,notJU4. power. supplies anddummyloadpriortoapplyingany Please indicatethatyouareusingtheMAX1917whencontactingthesecomponentsuppliers. UPIRPOEFXWEBSITE FAX PHONE SUPPLIER Do notturnonthepowersupply Detailed Description Quick Start Tables 1-4showjumpersettings. Table 1.JumperJU1Functions(POK) Table 4.JumperJU4Functions(V+) Adjustable Current-LimitSelection) Table 3.JumperJU3Functions(Fixed/ (Switching-Frequency Selection) Table 2.JumperJU2Functions o ntle laig300 550(asshipped) ConnectedtoGND Floating Installed Not Installed HN OAINPOKPIN SHUNT LOCATION LOCATION LOCATION SHUNT SHUNT U SLPNFREQUENCY(kHz) FSELPIN JU2 F o once oV 5.5to14 Notconnected toVL OFF OFF ON ON 2 and3 1 and2 sheet for for sheet M the P on sel sel on the to Connected toVL. ( C thr thr not p r onnected onnected otecti otecti Connected toVL oug resistor R3 Connected toVLthroughpullup resistor R3 Connected toVLOGICthroughpullup Component Suppliers AX AX ecti r Over Over h r h r ovi ovi ILIM PIN V+ PIN on 1917 d d 1917 i esi ng ng d nfor secti ed ed cur cur to GN to GN stor stor R1. ) m . Refer r ent on i ati ati ata R1 on D n Jumper Settings Adjustable current CURRENT-LIMIT 100mV (default) V+ VOLTAGE THRESHOLD RANGE (V) 4.5 to5.5 limit Evaluates: MAX1917 F μ C7 270 2V VOUT PGND J1 F μ C6 270 2V GND F μ C11 6.3V 2.5V TO 14V 10 C5 OPEN F μ C10 6.3V 10 F μ C3 10 25V C4 OPEN F 2V C9 μ 270 F μ C2 10 25V F 2V C8 μ Ω 270 R4 F 0.002 μ C1 10 25V H R8 μ L1 SHORT 0.8 R7 OPEN (PC TRACE) 3 N1 REF 7 VIN 3 5 12 N2 7 68 F MAX1917 Evaluation Kit Evaluation MAX1917 μ 4 C15 4.7 6.3V 5 12 VTTR 68 VL F 4 μ F μ C16 1 6.3V 6.3V C14 0.47 D1 JU4 11 14 15 16 12 13 9 9 VL LX DL DH VTT BST VTTR F PGND μ 25V C12 0.47 U1 V+ 8 GND 10 MAX1917 VL POK DDR EN/HSD REF ILIM FSEL 3 2 1 7 5 6 F Q1 F 3 2 μ μ C17 1 6.3V 3 Ω JU2 C13 0.47 6.3V JU1 2 ______3 R2 5.1k 1 Ω Ω 1 R3 R6 VIN 10k Ω 100k 4 3 R9 20 R1 OPEN Q2-B OPEN FLOAT = 300kHz GND = 550KHz 5 R5 V+ Q2-A OPEN 2 GND JU3 OPEN EN REF 2V VLOGIC POK DDR 5.5V TO 14V VL 6 1 Figure 1. MAX1917 EV Kit Schematic Evaluates: MAX1917 02MxmItgae rdcs rne S isaregisteredtrademarkofMaximIntegrated Products. PrintedUSA 2002Maxim IntegratedProducts © 4 implied. Maximreservestherightto change thecircuitryandspecificationswithoutnoticeatanytime. Maxim cannotassumeresponsibility foruseofanycircuitryotherthanentirelyembodiedinaMaxim product.Nocircu MAX1917 EvaluationKit iue4 A11 VKtP or aotGon ln Figure5.MAX1917 EVKitPCBoardLayout—Solder Side Figure 4.MAX1917EVKitPCBoard Layout—GroundPlane Component Side Figure 2.MAX1917EVKitComponentPlacementGuide— ______Maxim IntegratedProducts, 120SanGabriel Drive,Sunnyvale,CA94086 408-737-7600 Figure 3.MAX1917EVKitPCBoardLayout—ComponentSide it patentlicensesare