MAX17552 5V Output Evaluation Kit (MAX) General Description The MAX17552 5V evaluation kit (EV kit) (MAX(R)) is a fully assembled and tested circuit board that demonstrates the performance of the MAX17552 60V, 100mA ultra-small, high-efficiency, synchronous step-down DC-DC converter in a 10-pin MAX package. The EV kit operates over a wide input voltage range of 6V to 60V and provides up to 100mA load current at 5V output. It draws only 26A supply current under no-load conditions (EN/UVLO connected to VIN). The EV kit is programmed to switch at a frequency of 220kHz and delivers a peak efficiency of 93% with the supplied components. The device is simple to use and easily configurable with minimal external components. It features cycle-by-cycle peak current-limit protection, undervoltage lockout and thermal shutdown. The EV kit comes installed with the MAX17552AUB+ in an 10-pin (3mm x 3mm), lead(Pb)-free/RoHS-compliant MAX package. Features and Benefits 6V to 60V Input Voltage Range 5V Output, 100mA Continuous Current 93% Peak Efficiency 26A No-Load Supply Current EN/UVLO for On/Off Control and Programmable Input Undervoltage Lockout Programmable Switching Frequency Internal or Programmable Soft-Start PFM or Forced-PWM Mode of Operation RESET Output Peak Current-Limit Protection Thermal Shutdown Proven PCB Layout Fully Assembled and Tested Ordering Information appears at end of data sheet. MAX is a registered trademark of Maxim Integrated Products, Inc. 19-6906; Rev 1; 4/14 Evaluates: MAX17552 (MAX) in 5V Output-Voltage Application Quick Start Recommended Equipment MAX17552 5V EV kit (MAX) 60V adjustable, 0.5A DC power supply Electronic load up to 100mA Voltmeter Procedure The EV kit is fully assembled and tested. Follow the steps below to verify board operation. Caution: Do not turn on the power supply until all connections are completed. 1) Verify that shunts are installed on jumpers JU1 and JU2 (EN/UVLO). 2) Verify that jumper JU3 (MODE-PFM operation) is open. 3) Set the electronic load to constant-current mode, 100mA, and disable the electronic load. 4) Connect the electronic load's positive terminal to the VOUT PCB pad. Connect the negative terminal to the GND PCB pad. 5) Connect the voltmeter across the VOUT and GND PCB pads. 6) Set the power-supply output to 24V. Disable the power supply. 7) Connect the power-supply output to the VIN PCB pad. Connect the supply ground to the GND PCB pad. 8) Turn on the power supply. 9) Enable the electronic load and verify that output voltage is 5V with respect to GND. 10) Vary the input voltage from 6V to 60V. 11) Vary the load current from 1mA to 100mA and verify that output voltage is 5V with respect to GND. Note: While performing an output short-circuit test, it is possible for the ceramic output capacitor to oscillate with the wiring inductance between the capacitor and shortcircuited load, and thereby cause the absolute maximum rating of VOUT pin (-0.3V) to be exceeded. The resistor (R7) and the capacitor (C5) are included on this EV kit to protect against unintentional violation of the above mentioned rating. In the actual system design, parasitic board or wiring inductance should be minimized and the outputvoltage waveform under short-circuit operation should be verified to ensure that the absolute maximum rating of VOUT pin is not exceeded. Evaluates: MAX17552 (MAX) in 5V Output-Voltage Application MAX17552 5V Output Evaluation Kit (MAX) Detailed Description The MAX17552 5V EV kit (MAX) is a fully assembled and tested circuit board that demonstrates the performance of the MAX17552 60V, 100mA ultra-small, high-efficiency, synchronous step-down DC-DC converter in a 10-pin MAX package. The EV kit operates over a wide input voltage range of 6V to 60V and provides up to 100mA load current at 5V output. It draws only 26A supply current under no-load conditions (EN/UVLO connected to VIN). The EV kit is programmed to switch at a frequency of 220kHz and delivers a peak efficiency of 93% with the supplied components. The device is simple to use and easily configurable with minimal external components. It features cycle-by-cycle peak current-limit protection, undervoltage lockout and thermal shutdown. The EV kit includes an EN/UVLO PCB pad and jumpers JU1 and JU2 to enable control of the converter output. The MODE PCB pad and jumper JU3 are provided for selecting the mode of operation of the converter. RESET PCB pad is available for monitoring the RESET output. The RT/SYNC PCB pad can be used to synchronize the EV kit switching frequency to an external clock frequency. Enable Control (JU1, JU2) The EN/UVLO pin on the EV kit serves as an on/off control while also allowing the user to program the input undervoltage lockout (UVLO) threshold. Jumpers JU1 and JU2 configure the EV kit's output for turn-on/turn-off control. See Table 1 for proper JU1, JU2 jumper configurations. Additionally, resistors R1 and R2 are included to set the UVLO to a desired turn-on voltage. Refer to the Setting the Input Undervoltage-Lockout Level section in the MAX17552 IC data sheet for additional information on setting the UVLO threshold voltage. RESET Output The EV kit provides a PCB pad to monitor the status of the RESET output. RESET goes high when output voltage rises above 95% (typ) of its nominal regulated output voltage. RESET goes low when output voltage falls below 92% (typ) of its nominal regulated voltage. PFM or Forced-PWM Mode (MODE) The EV kit includes a jumper (JU3) to select the mode of operation of the converter. Install a shunt across JU3 before powering up the EV kit to enable the forced-PWM operation. Keep JU3 open to enable the light-load PFM operation. See Table 2 for proper JU3 settings. Soft-Start The EV kit offers a fixed 5ms soft-start time. Connect the capacitor C4 to adjust the soft-start time (tSS). Use the following equation to determine the soft-start capacitance value (CSS): CSS = 6.25 x tSS where tSS is in milliseconds and CSS is in nanofarads. External Synchronization (RT/SYNC) The EV kit provides a PCB pad to synchronize the EV kit switching frequency to an external clock frequency. Apply the external clock to the RT/SYNC PCB pad though an AC-coupling capacitor. Refer to the External Synchronization section in the MAX17552 IC data sheet for additional information on configuring the external clock and selecting the AC-coupling capacitor. Table 1. Enable Control (EN/UVLO) (JU1, JU2) SHUNT POSITION EN/UVLO PIN VOUT OUTPUT Connected to VIN Enabled JU1 JU2 1-2 Open Open 1-2 Connected to GND Disabled 1-2* 1-2 Connected to midpoint of R1/R2 resistor-divider Enabled at VIN 6V *Default position. Table 2. MODE Control (JU3) SHUNT POSITION MODE PIN MODE OF OPERATION 1-2 Connected to GND Forced PWM Open* Unconnected PFM *Default position. www.maximintegrated.com Maxim Integrated 2 Evaluates: MAX17552 (MAX) in 5V Output-Voltage Application MAX17552 5V Output Evaluation Kit (MAX) EV Kit Performance Report 90 90 80 80 70 70 60 VIN = 12V VIN = 36V VIN = 24V 50 40 20 10 0 100 toc3 VIN = 12V VIN = 48V VIN = 60V 10 PFM MODE 1 VIN = 12V VIN = 36V 40 30 0 VIN = 24V 50 20 OUTPUT VOLTAGE vs. LOAD CURRENT toc2 5.08 60 30 10 EFFICIENCY vs. LOAD CURRENT 100 EFFICIENCY (%) EFFICIENCY (%) toc1 OUTPUT VOLTAGE (V) EFFICIENCY vs. LOAD CURRENT 100 PWM MODE 0 20 40 60 80 5.05 VIN = 48V, 60V 5.02 VIN = 24V 4.99 4.96 100 VIN = 36V PFM MODE 0 20 40 60 80 100 LOAD CURRENT (mA) LOAD CURRENT (mA) LOAD CURRENT (mA) OUTPUT VOLTAGE vs. LOAD CURRENT LOAD TRANSIENT RESPONSE, PFM MODE (LOAD CURRENT STEPPED FROM 5mA to 50mA) LOAD TRANSIENT RESPONSE PFM OR PWM MODE (LOAD CURRENT STEPPED FROM 50mA TO 100mA) toc5 toc4 toc6 4.994 OUTPUT VOLTAGE (V) 4.992 VOUT(AC) 100mV/div 100mV/div VOUT(AC) 4.99 VIN = 12V 4.988 VIN = 24V VIN = 36V VIN = 48V 4.986 4.984 IOUT 50mA/div PWM MODE 0 20 40 60 80 50mA/div IOUT VIN = 60V 100 200s/div 100s/div LOAD CURRENT (mA) LOAD TRANSIENT RESPONSE PWM MODE (LOAD CURRENT STEPPED FROM NO LOAD TO 50mA) SOFT-START toc7 toc8 BODE PLOT toc9 5V/div VEN/UVLO VOUT(AC) 100mV/div IOUT 50mA/div 100s/div www.maximintegrated.com 2V/div VOUT 50mA/div IOUT 5V/div VRESET PHASE GAIN fCR = 8.5kHz, PHASE MARGIN = 64 1ms/div Maxim Integrated 3 Evaluates: MAX17552 (MAX) in 5V Output-Voltage Application MAX17552 5V Output Evaluation Kit (MAX) Component List DESIGNATION QTY C1 1 C2 C3 C4 DESCRIPTION DESIGNATION QTY 22F, 100V electrolytic capacitor (8.3mm x 8.3mm) Panasonic EEVFK2A220P R1 1 3.01M 1% resistor (0402) R2 1 787k 1% resistor (0402) R3 1 191k 1% resistor (0402) 1 1F 10%, 100V X7R ceramic capacitor (1206) Murata GRM31CR72A105K R4 1 261k 1% resistor (0402) R5 1 49.9k 1% resistor (0402) R6 1 100k 1% resistor (0402) 1 10F 10%, 6.3V X7R ceramic capacitor (1206) Murata GRM31CR70J106K R7 1 22.1 1% resistor (0402) U1 1 60V, 100mA, ultra-small, highefficiency, synchronous step-down DC-DC converter with 22A noload supply current (10 MAX) Maxim MAX17552AUB+ -- 3 Shunts -- 1 PCB: MAX17552AUB-5V EVALUATION KIT 0 Not installed, ceramic capacitor C5 1 0.22F 10%, 16V X7R ceramic capacitor (0402) Murata GRM155R71C224K JU1-JU3 3 2-pin headers L1 1 220H, 235mA inductor Coilcraft, Inc. LPS5030-224ML DESCRIPTION Component Suppliers SUPPLIER PHONE WEBSITE Coilcraft, Inc. 847-639-6400 www.coilcraft.com Murata Americas 770-436-1300 www.murataamericas.com Panasonic Corp. 800-344-2112 www.panasonic.com Note: Indicate that you are using the MAX17552AUB when contacting these component suppliers. www.maximintegrated.com Maxim Integrated 4 Evaluates: MAX17552 (MAX) in 5V Output-Voltage Application MAX17552 5V Output Evaluation Kit (MAX) tP l ` wPVTTQ` t a uhm Uu s n UOu J P qP RMOPl kw PO P Q P dmNt ukn dmNt ukn f mc X S P PXPj unt s U ea T f mc qS QUPj qT SXMXj bS nodm l nc d itQ qs Nr xmb rr Q qV QQMP OMQQt e R qdr ds qdr ds V unt s P W l nc d Q qU itR POOj Q qQ VWVj unt s TuKPOOl ` POt e UMRu bT qR unt s bR qs Nr xmb itP f mc uhm bQ Pt e POOu Q f mc bP QQt e POOu kP QQOt g Figure 1. MAX17552 5V EV Kit (MAX) Schematic www.maximintegrated.com Maxim Integrated 5 MAX17552 5V Output Evaluation Kit (MAX) Figure 2. MAX17552 5V EV Kit (MAX) Component Placement Guide--Component Side Evaluates: MAX17552 (MAX) in 5V Output-Voltage Application Figure 3. MAX17552 5V EV Kit (MAX) PCB Layout-- Component Side Figure 4. MAX17552 5V EV Kit (MAX) PCB Layout--Solder Side www.maximintegrated.com Maxim Integrated 6 MAX17552 5V Output Evaluation Kit (MAX) Evaluates: MAX17552 (MAX) in 5V Output-Voltage Application Ordering Information PART MAX17552AUBEVKIT# TYPE EV Kit #Denotes RoHS compliant. www.maximintegrated.com Maxim Integrated 7 Evaluates: MAX17552 (MAX) in 5V Output-Voltage Application MAX17552 5V Output Evaluation Kit (MAX) Revision History REVISION NUMBER REVISION DATE 0 1/14 Initial release -- 1 4/14 Updated Ordering Information table 7 DESCRIPTION PAGES CHANGED 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. 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. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. (c) 2014 Maxim Integrated Products, Inc. 8 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Maxim Integrated: MAX17552AUBEVKIT#