MAX17501B/ MAX17501F Evaluation Kits Evaluate: MAX17501B/MAX17501F in TDFN Packages General Description The MAX17501B/MAX17501F evaluation kits (EV kits) provide proven designs to evaluate the MAX17501B/ MAX17501F high-efficiency, high-voltage, synchronous step-down DC-DC converters. The EV kits use these devices to generate a fixed 5V at load currents up to 500mA from a 6V to 60V input supply. The MAX17501B supports a PFM control scheme with high light-load efficiency, while the MAX17501F features a forcedPWM control scheme that provides constant switchingfrequency operation at all load and line conditions. Features S Operates from a 6V to 60V Input Supply S 5V Fixed Output Voltage S 500mA Output Current S 600kHz Switching Frequency S Enable/UVLO Input S Resistor-Programmable UVLO Threshold S Open-Drain RESET Output S Overcurrent and Overtemperature Protection S PFM/PWM (MAX17501B EV Kit) S PWM (MAX17501F EV Kit) S Proven PCB Layout S Fully Assembled and Tested Ordering Information appears at end of data sheet. Component List DESIGNATION C1 C2 C3 C4 C7 QTY 1 1 DESCRIPTION 1FF Q10%, 100V X7R ceramic capacitor (1206) Murata GRM31CR72A105KA01L 1FF Q10%, 6.3V X7R ceramic capacitor (0603) Murata GRM188R70J105K 1 3300pF Q10%, 50V X7R ceramic capacitor (0402) Murata GRM155R71H332K 1 10FF Q10%, 10V X7R ceramic capacitor (1206) Murata GRM31CR71A106K 1 33FF, 80V aluminum electrolytic (D = 8mm) Panasonic EEEFK1K330P DESIGNATION QTY JU1 1 3-pin header DESCRIPTION L1 1 47FH, 1.4A inductor (6mm x 6mm x 3.5mm) Coilcraft LPS6235-473ML R1 1 3.32MI Q1% resistor (0402) R2 1 866kI Q1% resistor (0402) R4 1 100I resistor (0402) R6 1 10kI Q1% resistor (0402) TP1, TP2 0 Not installed, test points U1 1 See the EV Kit-Specific Component List — 1 Shunt — 1 PCB: See the EV Kit-Specific Component List For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com. 19-6436; Rev 1; 10/13 MAX17501B/ MAX17501F Evaluation Kits Evaluate: MAX17501B/MAX17501F in TDFN Packages EV Kit-Specific Component List EV KIT DESIGNATION MAX17501BTEVKIT# MAX17501FTEVKIT# DESCRIPTION U1 Buck converter (10 TDFN-EP*) Maxim MAX17501BATB+ — PCB: MAX17501BT EVALUATION KIT U1 Buck converter (10 TDFN-EP*) Maxim MAX17501FATB+ — PCB: MAX17501FT EVALUATION KIT *EP = Exposed pad. Component Suppliers SUPPLIER PHONE WEBSITE Coilcraft, Inc. 847-639-6400 www.coilcraft.com Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com Panasonic Corp. 800-344-2112 www.panasonic.com Note: Indicate that you are using the MAX17501 when contacting these component suppliers. Quick Start Recommended Equipment • MAX17501B or MAX17501F EV kit • 6V to 60V, 1A DC input power supply • Load capable of sinking 500mA • Digital voltmeter (DVM) • Function generator 6) Enable the load. 7) Verify that the DVM displays the expected voltage. To turn-on/off the part from EN/UVLO, follow the steps below: 1) Remove resistors R1 and R2 and the jumper installed across pins 1-2 on jumper JU1. Procedure The EV kit is fully assembled and tested. Follow the steps below to verify the board operation. Caution: Do not turn on power supply until all connections are completed. 1) Set the power supply at a voltage between 6V and 60V. Disable the power supply. 2) Connect the positive terminal of the power supply to the VIN PCB pad and the negative terminal to the nearest PGND PCB pad. Connect the positive terminal of the 500mA load to the VOUT PCB pad and the negative terminal to the nearest PGND PCB pad. 3) Connect the DVM across the VOUT PCB pad and the nearest PGND PCB pad. 4) Verify that a shunt is installed across pins 1-2 on jumper JU1. Maxim Integrated 5) Turn on the DC power supply. 2) Connect the power supply to the EV kit and turn on the power supply. Set the power supply at a voltage between 6V and 60V. 3) Connect the function generator output to the EN/UVLO test loop. 4) EN/UVLO rising threshold is 1.24V and falling threshold is 1.11V. Make sure that the voltage-high and voltagelow levels of the function generator output are greater than 1.24V and less than 1.11V, respectively. 5) While powering down the EV kits, first disconnect the function generator output from the EN/UVLO test loop and then turn off the DC power supply. Care should be taken in board layout and systems wiring to prevent violation of the absolute maximum rating of the FB/VO pin under short-circuit conditions. Under such conditions, it is possible for the ceramic output capacitor to oscillate with the board or wiring inductance between the 2 MAX17501B/ MAX17501F Evaluation Kits Evaluate: MAX17501B/MAX17501F in TDFN Packages capacitor and short-circuited load, and thereby cause the absolute maximum rating of FB/VO (-0.3V) to be exceeded. This parasitic board or wiring inductance should be minimized and the output voltage waveform under short-circuit operation should be verified to ensure that the absolute maximum rating of FB/VO is not exceeded. Detailed Description of Hardware Regulator Enable/UndervoltageLockout Level (EN/UVLO) The devices feature an EN/UVLO input. For normal operation, a shunt should be installed across pins 1-2 on jumper JU1. To disable the output, install a shunt across pins 2-3 on JU1 and the EN/UVLO pin is pulled to GND. See Table 1 for JU1 settings. Setting the Undervoltage-Lockout Level The MAX17501B/MAX17501F EV kits provide proven designs to evaluate the MAX17501B/MAX17501F highefficiency, high-voltage, synchronous step-down DC-DC converters. The EV kits generate a fixed 5V, at load currents up to 500mA, from a 6V to 60V input supply. The EV kits feature a 600kHz fixed switching frequency for optimum efficiency and component size. The MAX17501B EV kit supports a PFM control scheme with high light-load efficiency, while the MAX17501F EV kit features a forcedPWM control scheme that provides constant switchingfrequency operation at all load and line conditions. The devices offer an adjustable input undervoltagelockout level. Set the voltage at which the device turns on with a resistive voltage-divider connected from VIN to GND. Connect the center node of the divider to EN/ UVLO. The EV kits include an EN/UVLO PCB pad and jumper JU1 to enable control of the converter output. An additional RESET PCB pad is available for monitoring the converter output. The VCC PCB pad helps measure the internal LDO voltage. where VINU is the voltage at which the IC is required to turn on. Choose R1 to be 3.3MI and then calculate R2 as follows: R2 = R1× 1.218 (VINU − 1.218) Soft-Start Input (SS) The devices utilize an adjustable soft-start function to limit inrush current during startup. The soft-start time is adjusted by the value of C3, the external capacitor from SS to GND. To adjust the soft-start time, determine C3 using the following formula: C3 = 5.55 x tSS where tSS is the required soft-start time in milliseconds and C3 is in nanofarads. Table 1. Regulator Enable (EN/UVLO) Jumper JU1 Settings SHUNT POSITION EN/UVLO PIN 1-2* Connected to IN MAX17501_ OUTPUT Enabled Not installed Connected to the center node of resistor-divider R1 and R2 Enabled, UVLO level set through the R1 and R2 resistor-divider 2-3 Connected to GND Disabled *Default position. Maxim Integrated 3 MAX17501B/ MAX17501F Evaluation Kits Evaluate: MAX17501B/MAX17501F in TDFN Packages EV Kits Performance Report LOAD AND LINE REGULATION (MAX17501B) EFFICIENCY vs. LOAD CURRENT (MAX17501B) 100 5.20 90 VIN = 12V VIN = 24V 5.10 VIN = 36V 5.05 VIN = 48V 5.00 VIN = 12V 70 60 50 4.95 VIN = 36V 40 VIN = 48V 30 4.90 0 1 50 100 150 200 250 300 350 400 450 500 Figure 1. MAX17501B Load and Line Regulation 10 100 LOAD CURRENT (mA) LOAD CURRENT (mA) Figure 3. MAX17501B Efficiency EFFICIENCY vs. LOAD CURRENT (MAX17501F) LOAD AND LINE REGULATION (MAX17501F) 5.05 100 5.04 VIN = 12V 90 5.02 5.01 5.00 4.99 VIN = 48V VIN = 36V VIN = 24V VIN = 12V 4.98 4.97 EFFICIENCY (%) 5.03 OUTPUT VOLTAGE (V) VIN = 24V 80 EFFICIENCY (%) OUTPUT VOLTAGE (V) 5.15 80 70 VIN = 36V VIN = 48V VIN = 24V 60 50 4.96 4.95 0 50 100 150 200 250 300 350 400 450 500 LOAD CURRENT (mA) Figure 2. MAX17501F Load and Line Regulation Maxim Integrated 40 50 100 150 200 250 300 350 400 450 500 LOAD CURRENT (mA) Figure 4. MAX17501F Efficiency 4 MAX17501B/ MAX17501F Evaluation Kits Evaluate: MAX17501B/MAX17501F in TDFN Packages EV Kits Performance Report (continued) VOUT (AC) 100mV/div fCR = 49.8kHz PM = 62° IOUT 100mA/div 4 5 6 7 8 9 1 2 20µs/div Figure 5. MAX17501B/MAX17501F Full-Load Bode Plot (VIN = 24V) VOUT (AC) 100mV/div Figure 7. MAX17501F No Load to 250mA Load Transient VOUT (AC) 100mV/div IOUT 200mA/div IOUT 100mA/div 200µs/div Figure 6. MAX17501B 5mA to 255mA Load Transient Maxim Integrated 20µs/div Figure 8. MAX17501B/MAX17501F 250mA to 500mA Load Transient 5 MAX17501B/ MAX17501F Evaluation Kits Evaluate: MAX17501B/MAX17501F in TDFN Packages PGND 1 LX PGND 10 VOUT L1 47µH VOUT C4 10µF VIN VIN C1 1µF VIN GND 9 5V/500mA TP2 VOUT R6 10k 1% U1 MAX17501 EN/UVLO R4 100 PGND 2 C7 33µF TP1 3 EN/UVLO RESET 8 EN/UVLO RESET GND VCC 4 C2 1µF GND 5 VCC N.C. FB/VO SS EP 7 6 C3 3300pF VIN 1 R1 3.32M 1% JU1 2 3 EN/UVLO R2 866k 1% Figure 9. MAX17501B/MAX17501F EV Kits Schematic Maxim Integrated 6 MAX17501B/ MAX17501F Evaluation Kits 6 1 1 1 2 1 2 2 1 1 2 1 1 1 2 1 2 2 2 10 11 1 9 8 4 7 5 6 2 2 1 1 1 1 1 2 1 2 2 1 2 1 2 1 2 8 4 7 5 6 2 2 1 1 1 2 1 1 2 2 1 1 2 1 2 1 2 1 1 3 2 1 1.0’’ Figure 11. MAX17501F EV Kit Component Placement Guide— Component Side 1 1 2 1 2 11 9 3 Maxim Integrated 2 2 1 13 10 2 11 1 12 2 3 1 1 1 1 1 2 2 1 2 2 2 1 2 1 1 1 1 2 2 1 2 2 Figure 12. MAX17501B/MAX17501F EV Kits PCB Layout— Component Side 1 1 1 1 2 1 1 1 1 2 1 1 1 2 1 1 1 1.0’’ Figure 10. MAX17501B EV Kit Component Placement Guide— Component Side 2 2 2 2 1 1.0’’ 1 1 3 1 3 1 2 2 1 2 1 2 2 3 2 1 1 2 9 8 7 5 2 2 13 2 1 10 4 2 2 11 1 2 3 1 2 1 1 1 12 2 1 1 12 2 1 1 1 2 1 2 2 13 2 1 2 1 1 1 2 1 1 1 1 1 1 2 2 1 2 1 1 Evaluate: MAX17501B/MAX17501F in TDFN Packages 1.0’’ Figure 13. MAX17501B/MAX17501F EV Kits PCB Layout— Solder Side 7 MAX17501B/ MAX17501F Evaluation Kits Evaluate: MAX17501B/MAX17501F in TDFN Packages 1.0’’ Figure 14. MAX17501B/MAX17501F EV Kits PCB Layout—Top Solder Mask Maxim Integrated 1.0’’ Figure 15. MAX17501B/MAX17501F EV Kits PCB Layout— Bottom Solder Mask 8 MAX17501B/ MAX17501F Evaluation Kits Evaluate: MAX17501B/MAX17501F in TDFN Packages Ordering Information PART TYPE MAX17501BTEVKIT# EV Kit MAX17501FTEVKIT# EV Kit #Denotes RoHS compliant. Maxim Integrated 9 MAX17501B/ MAX17501F Evaluation Kits Evaluate: MAX17501B/MAX17501F in TDFN Packages Revision History REVISION NUMBER REVISION DATE 0 8/12 Initial release 1 10/13 Replaced the R4 resistor value from 0W to 100W in the Component List and Figure 9 schematic; added new paragraph to the Procedure section about preventing violation of the abs max rating for FB/VO DESCRIPTION PAGES CHANGED — 1, 2, 6 Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. 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