MAX1953 Evaluation MAX1953 evaluation kit) demonstrates three low

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MAX1953 Evaluation MAX1953 evaluation kit) demonstrates three low

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19-2516; 7/02
MAX1953 Evaluation
MAX1953 evaluation kit) demonstrates three low-cost, buck controller application circuits. MAX1953 application circuit features adjustable current limit. 1MHz switching frequency renders small footprint. MAX1954 application circuit operates from 13.2V input voltage range adjustable independent supply voltage. MAX1954 switches 300kHz boasts efficiency with supplied components. MAX1957 application circuit demonstrates ability track VREFIN. MAX1957 switches 300kHz capable sinking sourcing This fully tested comes with MAX1953 MAX1954 evaluation circuits assembled. MAX1953 also complete layout evaluate MAX1957. Request free samples MAX1957 from Maxim evaluate this circuit. Low-Cost Current-Mode Controllers Fixed-Frequency Pulse-Width Modulation (PWM) 0.8V (min) Output Voltage MAX1953/MAX1954 Operates from Input Voltage MAX1953 1MHz Switching Frequency Small Component Size, Cost Adjustable Current Limit MAX1954 13.2V Input Voltage Efficiency 300kHz Switching Frequency MAX1957 0.4V 0.86VIN Output Voltage Range Sinking Sourcing Capability Output Voltage Tracks VREFIN Shutdown Feature N-Channel MOSFETs Design Cost Current-Sense Resistor Needed Internal Digital Soft-Start Surface-Mount Components Thermal-Overload Protection Small 10-Pin µMAX Package MAX1953/MAX1954 Circuit Assembled Tested
Features
Evaluates: MAX1953/MAX1954/MAX1957
Component List
MAX1953 Application Circuit
DESIGNATION DESCRIPTION 0.1µF ±10%, ceramic capacitor Taiyo Yuden UMK107BJ104KA 10µF, ceramic capacitors Taiyo Yuden AMK212BJ106MG 270pF, ceramic capacitor Kemet C0402C271M8RAC installed 10µF, 6.3V ceramic capacitors Taiyo Yuden JMK316BJ106ML 4.7µF, 6.3V ceramic capacitor Taiyo Yuden JMK212BJ475MG 120pF, ceramic capacitor Murata GRM1885C1H121J Schottky diode Central Semiconductor CMPSH1-4 Jumper, SIP3, 3-pin header Digi-Key S1012-3-ND equivalent Jumper, SIP2, 2-pin header Digi-Key S1012-2-ND equivalent 1µH, 3.6A, inductor Toko 817FY-1R0M
C13,
Ordering Information
PART MAX1953EVKIT TEMP RANGE -40°C +85°C PACKAGE µMAX
Recommended Equipment
power supply battery Digital multimeter (DMM) Ammeter (optional)
Maxim Integrated Products
pricing, delivery, ordering information, please contact Maxim/Dallas Direct! 1-888-629-4642, visit Maxim's website www.maxim-ic.com.
MAX1953 Evaluation Evaluates: MAX1953/MAX1954/MAX1957
Component List (continued)
MAX1953 Application Circuit (continued)
DESIGNATION None DESCRIPTION Shunt Digikey S9000-ND equivalent Dual, 20V, 9.4A, 0.014 MOSFET Fairchild FDS6898A 16.9k resistor 8.06k resistor resistor MAX1953EUB JU1, None
MAX1954 Application Circuit (continued)
DESIGNATION DESCRIPTION 1000pF, ceramic capacitor Kemet C0402C102M8RAC 47pF, ceramic capacitor Kemet C0402C470K8GAC 0.22µF, ceramic capacitor Kemet C0603C224M8RAC Schottky diode Central Semiconductor CMPSH1-4 Jumpers, SIP2, 2-pin headers Digi-Key S1012-2-ND equivalent 2.7µH, 6.6A, inductor Coilcraft DO3316P-272HC Dual, 20V, 7.5A, 0.018 MOSFET Fairchild FDS6890A 9.09k resistor 8.06k resistor resistor Shunt Digikey S9000-ND equivalent MAX1954EUB
MAX1954 Application Circuit
DESIGNATION DESCRIPTION 10µF, ceramic capacitor Taiyo Yuden EMK325BJ106MN 0.1µF ±10%, ceramic capacitor Taiyo Yuden #EMK107BJ104KA 180µF, capacitor Panasonic EEFUE0G181R 10µF, ceramic capacitor Taiyo Yuden AMK212BJ106MG, (Not installed)
Component Suppliers
SUPPLIER Central Semiconductor Coiltronics Fairchild Semiconductor Kemet Murata Taiyo Yuden Toko COMPONENT Diodes Inductors MOSFETs Capacitors Capacitors Capacitors Inductors PHONE 516-435-1110 561-752-5000 408-721-2181 864-963-6300 770-436-1300 408-573-4150 800-745-8656 WEBSITE www.centralsemi.com www.coiltronics.com www.fairchildsemi.com www.kemet.com www.murata.com www.t-yuden.com www.toko.com
Quick Start
MAX1953/MAX1954 application circuits fully assembled tested. Follow these steps verify board operation:
Verify that shunt place between positions Verify that there shunt JU2. Connect positive lead power supply connect negative lead power supply GND0. Turn power supply.
MAX1954
Preset power supply Turn power supply.
MAX1953 Evaluation
Verify that voltage VOUT 1.7V. Gradually increase input voltage 5.5V, verifying that output voltage remains 1.7V. Connect load between VOUT GND0. Verify that voltage VOUT 1.7V.
Setting Current Limit (MAX1953)
short-circuit current-limit threshold MAX1953. Short between pins 105mV threshold, between 320mV threshold, remove shunt from 210mV threshold.
Evaluates: MAX1953/MAX1954/MAX1957
Evaluating MAX1957
MAX1953
MAX1957 circuit comes unpopulated MAX1953 kit. Table bill materials MAX1957 circuit. evaluate MAX1957, request free sample MAX1957 from Maxim populate MAX1953 board with components specified.
Preset power supply Turn power supply. Ensure that there shunt between positions JU3. Verify that there shunt JU4. Connect positive lead power supply VIN1 connect negative lead GND1 pad. Turn power supply. Verify that voltage VOUT1 2.5V. Gradually increase input voltage 5.5V verifying that output voltage remains 2.5V. Connect load between VOUT1 GND2. Verify that voltage VOUT1 2.5V.
Setting Output Voltage
MAX1957's output voltage tracks voltage REFIN. Populate with resistors ratio 1/2. different input/output voltage ratio with following equation: VOUT2 VREFIN /(R7 R8))
Jumper Settings
JU2, JU4, Functions (Shutdown Mode)
MAX1953/MAX1954/MAX1957 feature shutdown mode minimize quiescent current. shut down MAX1953, place shunt between pins JU4. shut down MAX1954, place shunt between pins JU2. shutdown MAX1957, place shunt between pins JU5.
Detailed Description
Evaluating Other Output Voltages
MAX1953/MAX1954 application circuits come assembled with output voltages 2.5V 1.7V, respectively. MAX1953/MAX1954 capable adjustable output voltage settings from 0.8V 0.86VIN. adjust output voltage, place 8.06k resistor (R5) resistor (R4) with value corresponding equation: (R4) 8.06 ((VOUT/0.8) VOUT exceed VIN. compensation network need optimized each output voltage. Refer Stability Compensation section MAX1953/MAX1954/ MAX1957 data sheet method calculate compensation components.
Function (HSD Control, MAX1954)
pins MAX1954 connected when using input voltages lower than 5.5V. Place shunt connect pins.
Function (ILIM Control, MAX1953)
select current-limit threshold MAX1953. Table possible positions JU3.
Input Capacitance Guidelines
oscillation occur input voltage when using MAX1953 that shows output. This typically long input leads. "tank" circuit formed with inductance input leads input capacitance. very short leads high equivalent series resistance (ESR) capacitor (aluminum electrolytic tantalum) input stop this oscillation. This "detunes" tank circuit effectively stops oscillation.
Using Separate Power Supplies (MAX1954)
power supplies used with MAX1954 order extend input voltage range 13.2V. Remove shunt separate power supplies VHSD. input voltage required between 5.5V, VHSD connected together through JU1.
MAX1953 Evaluation Evaluates: MAX1953/MAX1954/MAX1957
Table MAX1957 Bill Materials
DESIGNATION C17, C18, DESCRIPTION 270µF, polymer capacitors Panasonic EEFUE0E271R 10µF, 6.3V ceramic capacitor Taiyo Yuden JMK316BJ106ML 4.7µF, 6.3V ceramic capacitor Taiyo Yuden JMK212BJ475MG 470pF, ceramic capacitor Kemet C0402C471M8RAC 0.1µF ±10%, ceramic capacitors Taiyo Yuden UMK107BJ104KA 22µF, 6.3V ceramic capacitors Taiyo Yuden JMK316BJ226ML 68pF, ceramic capacitor Kemet C0402C680K8GAC 1500pF, ceramic capacitor Murata GRM188R71H152K Schottky diode Central Semiconductor CMPSH1-4 Jumper, SIP2, 2-pin header Digikey S1012-2-ND equivalent DESIGNATION None DESCRIPTION 2.7µH, 6.6A,12m inductor Coilcraft DO3316P-272HC Dual, 20V, 7.5A, 0.018 MOSFET Fairchild FDS6890A Shunt Digi-Key S9000-ND equivalent resistors 51.1k resistor resistor MAX1957EUB
C23,
C25, C26,
VHSD 5.5V 13.2V
Table Positions
SHUNT LOCATION Between None Between ILIM Connected Floating Connected (mV)
CMPSH1-4 0.22µF MAX1954 1000pF 47pF COMP/ SHDN 0.1µF 2.7µH, 6.6A COILCRAFT DO3316P-272HG VOUT 1.7V FAIRCHILD FDS6890A 10µF
9.09k 180µF OPEN POLYMER 8.06k
PGND
Figure MAX1954 Schematic
MAX1953 Evaluation Evaluates: MAX1953/MAX1954/MAX1957
VIN1 3.6V 10µF
4.7µF
10µF
CMPSH1-4 FAIRCHILD FDS6898A
ILIM
MAX1953
0.1µF
1µH, 3.6A TOKO 817FY-1ROM
VOUT1 2.5V
270pF OPEN
COMP/ SHDN
16.9k 10µF 8.06k 120pF 10µF
PGND
Figure MAX1953 Schematic
VIN2 3.6V
4.7µF
10µF
CMPSH1-4 FAIRCHILD FDS6890A
22µF
22µF
22µF
REFIN 2.5V
REFIN 0.1µF
MAX1957
0.1µF
2.7µH, 6.6A COILCRAFT DO3316-272HC 1500pF 270µF 270µF 270µF
VOUT2 1.25V
470pF 51.1k 68pF
COMP/ SHDN
PGND
POLYMER
Figure MAX1957 Schematic
MAX1953 Evaluation Evaluates: MAX1953/MAX1954/MAX1957
1.0"
Figure MAX1953 Component Placement Guide-Top Silkscreen
MAX1953 Evaluation Evaluates: MAX1953/MAX1954/MAX1957
1.0"
Figure MAX1953 Board Layout-Component Side
MAX1953 Evaluation Evaluates: MAX1953/MAX1954/MAX1957
1.0"
Figure MAX1953 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.

MAX1953 Evaluation MAX1953 evaluation kit) demonstrates three low

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