MAX1917 Evaluation MAX1917 evaluation kit) demonstrates MAX1917's

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MAX1917 Evaluation MAX1917 evaluation kit) demonstrates MAX1917's

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19-2491; 7/02
MAX1917 Evaluation
MAX1917 evaluation kit) demonstrates MAX1917's standard application circuit. This DC-DC converter provides complete power-management solution memory. This fully assembled tested circuit board. MAX1917 generates regulated voltage VTTR that half voltage input. input voltage range 2.5V 14V. circuit configured deliver output current. DC-DC converter uses buck topology with synchronous rectification achieve output voltage with greater than efficiency. converter output capable sourcing sinking current. Sink capabilities voltage arise from synchronous rectifier, which allows inductor current reverse. operates 550kHz switching frequency superior load-transient response that meets JEDEC specifications memory. Output Voltage Accuracy 2.5V Input Voltage Range Output Current Capability Sourcing Sinking Current 550kHz Switching Frequency 16-Pin QSOP Package Low-Profile Components Fully Assembled Tested
Features
Automatically Sets VTTR VDDR
Evaluates: MAX1917
Ordering Information
PART MAX1917EVKIT TEMP RANGE +70°C PACKAGE QSOP
Component List
DESIGNATION DESCRIPTION 10µF, ceramic capacitors (1812) Taiyo Yuden TMK432BJ106KM C4532X5R1E106M installed, case 270µF, low-ESR specialty polymer capacitors, case Panasonic EEFUE0E271R 10µF, 6.3V ceramic capacitors (1206) Taiyo Yuden JMK212BJ106MG C3216X5R0J106M 0.47µF, ceramic capacitor (1206) Taiyo Yuden TMK316BJ474ML 0.47µF, 6.3V ceramic capacitors (0603) Taiyo Yuden JMK107BJ474MA 4.7µF, 6.3V ceramic capacitor (0805) Taiyo Yuden JMK212BJ475MG 1µF, 6.3V 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, DESCRIPTION 2-pin headers installed 0.8µH, power inductor Sumida CDEP105L-0R8 N-channel MOSFETs (8-pin International Rectifier IRF7811W N-channel MOSFET (SOT23) Central Semiconductor 2N7002 installed, complementary MOSFETs (SC-89) Siliconix Si1029X installed (0805) 5.1k resistor (0805) 100k resistor (0805) 0.002 ±1%, resistor (2512) Panasonic ERJM1WTF2M0U resistor (0805) installed (short trace) (0805) resistor (0805) MAX1917EEE (16-pin QSOP) Shunts Rubber bumpers SJ-5007 Mouser 517-SJ-5007BK equivalent MAX1917 board MAX1917 data sheet MAX1917 data sheet
C6-C9
C10,
None None None None None
C13,
C16,
Maxim Integrated Products
pricing, delivery, ordering information, please contact Maxim/Dallas Direct! 1-888-629-4642, visit Maxim's website www.maxim-ic.com.
MAX1917 Evaluation Evaluates: MAX1917
Component Suppliers
SUPPLIER Central Semiconductor International Rectifier Panasonic Taiyo Yuden PHONE 516-435-1110 310-322-3331 714-373-7334 408-573-4150 847-390-4373 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 using MAX1917 when contacting these component suppliers.
Quick Start
following equipment needed: 2.5V power supply (VIN), battery, notebook adapter DC-bias power supply (V+), 5.5V 100mA Dummy load capable sourcing/sinking Digital multimeter (DMM) 100MHz dual-trace oscilloscope MAX1917 fully assembled tested surface-mount board. Follow steps below verify board operation. turn power supply until connections completed: Ensure that circuit connected correctly supplies dummy load prior applying power. Verify that shunts across pins JU2, JU3, JU4. Apply external reference pad. Turn power supplies observe output with and/or oscilloscope. Look switching node MOSFET gate-drive signals while varying load current.
Jumper Settings
Tables show jumper settings.
Table Jumper Functions (POK)
SHUNT LOCATION Connected VLOGIC through pullup resistor Connected through pullup resistor
Table Jumper Functions (Switching-Frequency Selection)
Installed Installed FSEL Floating Connected FREQUENCY (kHz) shipped)
Table Jumper Functions (Fixed/ Adjustable Current-Limit Selection)
SHUNT LOCATION ILIM Connected Connected through resistor (not provided). Refer Overcurrent Protection section MAX1917 data sheet information selecting CURRENT-LIMIT THRESHOLD 100mV (default)
Detailed Description
MAX1917 provides complete power-management solution memory. synchronous, buck-switching, DC-DC converter that generates half voltage input VTTR. synchronous rectification mode ensures balanced sourcing sinking current capability operates 550kHz switching frequency superior line- load-transient response.
Adjustable current limit
Table Jumper Functions (V+)
SHUNT LOCATION Connected connected VOLTAGE RANGE
MAX1917 Evaluation Evaluates: MAX1917
0.47µF
5.5V
VLOGIC
0.47µF 6.3V EN/HSD 4.7µF 6.3V 10µF 10µF 10µF 2.5V
100k OPEN Q2-A OPEN 6.3V 5.1k
0.8µH 0.002 OPEN OPEN 270µF
Q2-B OPEN
MAX1917
270µF
0.47µF 6.3V PGND
OPEN VOUT SHORT TRACE)
VTTR 6.3V
OPEN ILIM FSEL VTTR
270µF
270µF
10µF 6.3V
10µF 6.3V
PGND
FLOAT 300kHz 550KHz
Figure MAX1917 Schematic
MAX1917 Evaluation Evaluates: MAX1917
Figure MAX1917EV Component Placement Guide- Component Side
Figure MAX1917 Board Layout-Component Side
Figure MAX1917 Board Layout-Ground Plane
Figure MAX1917 Board Layout-Solder Side
Maxim cannot assume responsibility circuitry other than circuitry entirely embodied Maxim product. circuit patent licenses implied. Maxim reserves right change circuitry specifications without notice time.
_Maxim Integrated Products, Gabriel Drive, Sunnyvale, 94086 408-737-7600 2002 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.

MAX1917 Evaluation MAX1917 evaluation kit) demonstrates MAX1917's

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