MAX1845 Evaluation MAX1845 evaluation kit) demonstrates MAX1845's

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MAX1845 Evaluation MAX1845 evaluation kit) demonstrates MAX1845's

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19-2101; 8/01
MAX1845 Evaluation
MAX1845 evaluation kit) demonstrates MAX1845's standard application circuit. This DC-DC converter steps down high-voltage batteries and/or adapters, generating precision, low-voltage rails chipset, DRAM supplies, core, supplies. MAX1845 provides dual 1.8V 2.5V output voltages from battery input range. delivers output current 2.5V output 1.8V output, with greater than efficiency. operates 255kHz/345kHz switching frequency superior line- load-transient response. This fully assembled tested circuit board. also allows evaluation other output voltages 1.0V 5.5V range changing feedback resistors R1-R4. Input Voltage Range 1.8V 2.5V Output Voltages 1.0V 5.5V Adjustable Outputs Output Current (2.5V Output) Output Current (1.8V Output) Adjustable Current-Limit Threshold 255kHz/345kHz Switching Frequency Power-Good Output Over- Undervoltage Protection 28-Pin QSOP Package Low-Profile Components Fully Assembled Tested
Features
Evaluates: MAX1845
Ordering Information
PART MAX1845EVKIT TEMP. RANGE +70oC PACKAGE QSOP
Component List
DESIGNATION C1-C5 DESCRIPTION 10µF, ceramic capacitors (1812) Taiyo Yuden TMK432BJ106KM C4532X5R1E106M 470µF, 6.3V, low-ESR tantalum capacitors Kemet T510X477M006AS 0.1µF ceramic capacitors (0805) 1µF, ceramic capacitor (0805) Taiyo Yuden LMK212BJ105MG 3.3µF, ceramic capacitor (1206) Taiyo Yuden LMK316BJ335ML installed 0.22µF ceramic capacitor (1206) 4.7µF, tantalum capacitor Sprague 595D475X0016A2B 100mA, dual Schottky diode Central Semiconductor CMPSH-3A Schottky diodes Nihon EP10QY03 Toshiba CRS02 2.2µH power inductor Panasonic ETQP6F2R2SFA Sumida CDRH127-2R4 DESIGNATION DESCRIPTION 4.7µH power inductor Sumida CDRH124-4R7MC N-channel MOSFET International Rectifier IRF7807 Fairchild FDS6612A N-channel MOSFET International Rectifier IRF7805 Fairchild FDS6670A Dual N-channel MOSFET Fairchild FDS6982A installed 0.005 ±1%, resistor (2512) Dale WSL-2512-R005F Panasonic ERJM1WSF5MOU 100k resistor (0805) resistors (0805) 0.010 ±1%, 1/2W resistor (2010) Dale WSL-2010-R010F resistor (0805) MAX1845EEI (28-pin QSOP) 3-pin headers Shunts Rubber feet MAX1845 board MAX1845 data sheet MAX1845EVKIT data sheet
C6-C9 C10,
N3A, R1-R4, R10-R14 JU1, JU2, None None None None None
C14, C15, C17,
Maxim Integrated Products
pricing, delivery, ordering information, please contact Maxim/Dallas Direct! 1-888-629-4642, visit Maxim's website www.maxim-ic.com.
MAX1845 Evaluation Evaluates: MAX1845
Component Suppliers
SUPPLIER Central Semiconductor Dale-Vishay Fairchild International Rectifier Kemet Nihon Panasonic Sumida Taiyo Yuden Toshiba PHONE 516-435-1110 402-564-3131 408-721-2181 310-322-3331 408-986-0424 847-843-7500 714-373-7939 708-956-0666 408-573-4150 847-390-4373 949-455-2000 516-435-1824 402-563-6418 408-721-1635 310-322-3332 408-986-1442 847-843-2798 714-373-7183 708-956-0702 408-573-4159 847-390-4428 949-859-3963
Table Jumper Functions (Output Voltage VOUT1 Control)
Connected Connected OUTPUT VOLTAGE VOUT1 1.8V, enabled VOUT1 disabled
Table Jumper Functions (Output Voltage VOUT2 Control)
Connected Connected OUTPUT VOLTAGE VOUT2 2.5V, enabled VOUT2 disabled
Note: Please indicate that using MAX1845 when contacting these component suppliers.
Recommended Equipment
22V, power supply, battery, notebook adapter bias power supply, 100mA Dummy loads capable sinking Digital multimeters (DMMs) 100MHz dual-trace oscilloscope
Table Jumper Functions (SKIP Mode Selection)
SKIP Connected OPERATING MODE Low-noise mode, forced fixedfrequency operation. Normal operation, allows automatic PWM/PFM switchover pulse skipping light load, resulting highest efficiency.
Quick Start
Ensure that circuit connected correctly supplies dummy load prior applying power. Verify that shunts across pins pins pins Turn supply prior bias power; otherwise, output UVLO timer will time FAULT latch will set, disabling regulator outputs until power cycled ON1/ON2 toggled. Verify that output voltages 1.8V (VOUT1) 2.5V (VOUT2).
Connected
Table Jumper Functions (Output Voltage Selection)
Connected Connected board trace) Connected resistor-divider R3/R4 OUTPUT VOLTAGE VOUT1 1.5V VOUT1 1.8V
Evaluating Other Output Voltages
outputs preset +1.8V +2.5V. However, output voltages also adjusted between 1.0V 5.5V selecting R1/R2 R3/R4 values. Select feedback resistors range. then given [(VOUT VFB) where 1.0V.
installed
Adjustable mode
MAX1845 Evaluation Evaluates: MAX1845
Table Jumpers JU5/JU6/JU7 Functions (Switching-Frequency Selection)
installed installed Installed installed installed Installed installed installed installed installed installed Installed Floating Connected Connected Connected VOUT1/VOUT2 FREQUENCY (kHz) 255/345 shipped) 170/235 355/485 460/620
IMPORTANT: Don't change operating frequency without first recalculating component values because frequency significant effect peak current-limit level, MOSFET heating, preferred inductor value, PFM/PWM switchover point, output noise, efficiency, other critical parameters.
Table Jumper Functions (Overvoltage Protection Selection)
Installed installed Connected Connected through Connected voltage between 1.0V 1.8V through divider THRESHOLD disabled enabled. threshold 114% nominal. threshold 100% 180% nominal VOUT1 VOUT2 according divider
Table Jumper Functions (Undervoltage Protection Selection)
installed Installed Connected through Connected THRESHOLD enabled. threshold nominal. disabled
installed
Table Jumper JU10 Functions (Fixed/Adjustable Current-Limit Selection VOUT2)
JU10 ILIM2 Connected through board trace Connected through resistordivider R13/R14. Refer CurrentLimit Circuit section MAX1845 data sheet information selecting R13/R14. CURRENT-LIMIT THRESHOLD 50mV (default)
Table Jumper JU11 Functions (Fixed/Adjustable Current-Limit Selection VOUT1)
JU11 ILIM1 Connected through board trace Connected through resistordivider R11/R12. Refer Current-Limit Circuit section MAX1845 data sheet information selecting R11/R12. CURRENT-LIMIT THRESHOLD 50mV (default)
SHORT
SHORT
OPEN
Adjustable between 30mV 250mV
OPEN
Adjustable between 30mV 250mV
Evaluates: MAX1845
ILIM1 3.3µF BST1 N3-B 4.7µH 0.1µF 0.005 OPEN 100k SKIP 0.22µF FLOAT 300kHz 200kHz 540kHz OPEN PGOOD SHORT TRACE) BST2 BST1 BST1 0.1µF 2.2µH 10µF 10µF
MAX1845 Evaluation
Figure MAX1845 Schematic
JU10 OPEN OPEN ILIM2 10µF 4.7µF VBIAS OPEN OPEN JU11 VOUT2 2.5V, 470µF 6.3V N3-A 0.01
OUT1 OUT2 OPEN VOUT1 1.5V 1.8V 420kHz PGOOD SHORT TRACE)
10µF
10µF
VOUT1 1.8V,
470µF 6.3V
470µF 6.3V
470µF 6.3V
MAX1845
OPEN
OPEN
OPEN
OPEN
SHORT TRACE)
OPEN
MAX1845 Evaluation Evaluates: MAX1845
Figure MAX1845 Component Placement Guide-Component Side
Figure MAX1845 Board Layout-Component Side
Figure MAX1845 Board Layout-Internal Plane (Layer
Figure MAX1845 Board Layout-Internal Plane (Layer
MAX1845 Evaluation Evaluates: MAX1845
Figure MAX1845 Board Layout-Solder Side
Figure MAX1845 Component Placement Guide- 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 2001 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.

MAX1845 Evaluation MAX1845 evaluation kit) demonstrates MAX1845's

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