Evaluates: MAX16932, MAX16933 MAX16932 Evaluation Kit General Description The MAX16932 evaluation kit (EV kit) is a fully assembled and tested application circuit for the MAX16932 highvoltage, dual synchronous step-down controller. The EV kit is set up to provide 5V and 3.3V from an input voltage ranging from 3.5V to 36V. Each buck rail can deliver up to 5A load current. The EV kit's switching frequency is set at 2.2MHz for both buck converters. Various jumpers are provided to help evaluate features of the MAX16932 IC. Benefits and Features Dual, Synchronous Step-Down Controllers Operate at 180 Out-of-Phase to Reduce Switching Noise 3.5V to 36V Wide Input Supply Range Buck Output Voltage: 5V and 3.3V Fixed or Adjustable Between 1V and 10V Current-Mode Controllers with Forced-PWM and Skip Modes Quick Start Recommended Equipment * MAX16932 EV kit * 3.5V to 36V, 15A power supply * Two voltmeters * Two electronic loads capable of sinking 5A each Procedure The EV kit is fully assembled and tested. Follow the steps below to activate the board. Caution: Do not turn on the power supply until all connections are completed. 1) Verify that all jumpers are in their default configurations according to Table 1. 2) Connect the positive and negative terminals of the power supply to the VBATF and PGND test pads, respectively. 3) Connect the positive terminal of the first electronic load to the VOUT1 test pad. Connect the ground terminal of the electronic load to the corresponding PGND test pad. 4) Connect the positive terminal of the second electronic load to the VOUT2 test pad. Connect the ground terminal of the electronic load to the corresponding PGND test pad. 5) Set the power-supply voltage to 14V. 6) Turn on the power supply. 7) Enable the electronic loads. 8) Verify that VOUT1 is approximately 5V. 9) Verify that VOUT2 is approximately 3.3V. Resistor-Programmable Frequency Between 1MHz and 2.2MHz Frequency Synchronization Input Independent Enable Inputs Voltage Monitoring PGOOD_ Outputs Fully Assembled and Tested EV Kit Contents MAX16932 EV Kit Board Ordering Information appears at end of data sheet. 19-6806; Rev 0; 9/13 Evaluates: MAX16932, MAX16933 MAX16932 Evaluation Kit Table 1. Default Jumper Settings JUMPER DEFAULT SHUNT POSITION JU1, JU2 1-2 Buck outputs enabled. JU6 1-2 Forced-PWM mode. JU7 1-2 JU8, JU9 Installed Detailed Description of Hardware The MAX16932 EV kit, which evaluates the MAX16932 high-voltage, dual synchronous step-down controller, can supply up to two rails. The EV kit includes two currentmode buck outputs that are fixed to 5V and 3.3V, or programmable from 1V to 10V with external resistor-dividers. The current capability is 5A per rail. Both outputs are current limited and can be controlled independently through their respective enable inputs EN_. Switching Frequency/ External Synchronization The EV kit switching frequency can be adjusted from 1MHz to 2.2MHz by changing the FOSC resistor R136. The EV kit can also be synchronized to an external clock by connecting the external clock signal to the FSYNC test point. Refer to the Switching Frequency/External Synchronization section in the MAX16932 IC data sheet for more details. Enable Control The EV kit features jumper JU1 to independently control the enable input of VOUT1 and jumper JU2 to control the enable input of VOUT2. Connect the EN_ pin to VBAT (pins 1-2) to enable VOUT_. Connect the EN_ pin to ground (pins 2-3) to disable VOUT_. See Table 2. FUNCTION Switches to EXTVCC. Internal regulator disabled. PGOOD_ pulls up to VBIAS when OUT_ is in regulation. Table 2. Enable Control (JU1, JU2) SHUNT POSITION EN_ PIN VOUT_ 1-2* Connected to VBAT Enabled 2-3 Connected to PGND Disabled *Default configuration. Table 3. Mode of Operation (JU6) SHUNT POSITION FSYNC PIN MODE 1-2* Connected to BIAS Forced-PWM mode 2-3 Connected to AGND Skip mode *Default configuration. Table 4. EXTVCC (JU7) SHUNT POSITION EXTVCC PIN 1-2 Connected to VOUT1 Switches to EXTVCC. Internal regulator disabled. 1-3* Connected to PGND Internal regulator enabled. 1-4 Connected to VOUT2 Switches to EXTVCC. Internal regulator disabled. Mode of Operation The EV kit features jumper JU6 to configure the mode switch-control input (Table 3). Drive FSYNC high (pins 1-2 of JU6) to enable forced-PWM mode. Drive FSYNC low (pins 2-3 of JU6) to enable skip mode under light loads. BIAS *Default configuration. EXTVCC Switchover Comparator The internal linear regulator can be bypassed by connecting an external supply (3.1V to 5.2V) or the output of one of the buck converters to EXTVCC. BIAS internally switches to EXTVCC and the internal linear regulator turns off. If VEXTVCC drops below VTH,EXTVCC = 3.1V(min), the internal regulator enables and switches back to BIAS. See Table 4. www.maximintegrated.com Maxim Integrated 2 MAX16932 Evaluation Kit Buck Output Monitoring (PGOOD_) The EV kit provides two power-good output test points (PGOOD1 and PGOOD2) to monitor the status of the two buck outputs (OUT1 and OUT2). Each PGOOD_ goes high (high impedance) when the corresponding regulator output voltage is in regulation. Each PGOOD_ goes low when the corresponding regula tor output voltage drops below 15% (typ) or rises above 10% (typ) of its nominal regulated voltage. PGOOD_ asserts low during soft-start and in shutdown. PGOOD_ becomes high impedance when OUT_ is in regulation. To obtain a logic signal, pull up PGOOD_ to VBIAS by installing shunts on JU8 and JU9. Setting the Output Voltage in Buck Converters Evaluates: MAX16932, MAX16933 Evaluating the MAX16933 on the MAX16932 EV Kit The MAX16932 EV kit can be modified to operate the MAX16933. The MAX16933 operates at a switching frequency of 400kHz, which requires a change in the following components: 1) Replace U1 with the MAX16933 IC. 2) Replace R136 (RFOSC) with 80.6k to achieve 400kHz switching frequency. 3) Replace the buck inductors (L7, L8) with a 6.8H 7A inductor. Contact Technical Support at www.maximintegrated. com/support for any further questions. To externally adjust the output voltage OUT1 between 1V and 10V, remove R122 and install a 0 resistor on R121. Connect a resistive divider from the output OUT1 to FB1 to AGND. Place appropriate resistors in positions R58 and R119 and R120 according to the following equation: V = R119 R120 OUT1 - 1 VFB1 where VFB1 = 1V (typ). To externally adjust the output voltage OUT2 between 1V and 10V, remove R132 and install a 0 resistor on R133. Connect a resistive divider from the output OUT2 to FB2 to GND. Place appropriate resistors in positions R131 and R132 according to the following equation: V = R131 R132 OUT2 - 1 V FB2 where VFB2 = 1V (typ). www.maximintegrated.com Maxim Integrated 3 MAX16932 Evaluation Kit Evaluates: MAX16932, MAX16933 Component List DESIGNATION QTY C1, C2, C3, C75, C83 5 C4, C5, C100-C103, C105-C108, C111, C112, C119, C120 0 DESCRIPTION 0.1F 10%, 50V X7R ceramic capacitors (0603) Murata GRM188R71H104K Not installed, ceramic capacitors (0603) C76, C77, C84, C85 4 47F 20%, 16V X7R ceramic capacitor (2220) TDK CGA9N3X7R1C476M C78, C86 2 4700pF 10%, 50V X7R ceramic capacitors (0402) Murata GRM155R71H472K C79 1 22pF 5%, 50V C0G ceramic capacitor (0402) Murata GRM1555C1H220J C81 1 6.8F 10%, 16V X7R ceramic capacitor (1206) TDK C3216X7R1C685K C82 1 2.2F 10%, 10V X7R ceramic capacitor (0603) Murata GRM188R71A225K C87 1 33pF 5% 50V C0G ceramic capacitor (0402) Murata GRM1555C1H330J C88 1 47F, 50V aluminum electrolytic capacitor (E) Panasonic EEE-FK1H470P C90-C93, C97, C116 6 4.7F 10%, 50V X7R ceramic capacitors (1210) Murata GCM32ER71H475KA55L www.maximintegrated.com DESIGNATION QTY DESCRIPTION C117, C118 0 Not installed, ceramic capacitors (2220) D20, D21 2 200mA, 30V diodes (SOT23) Fairchild BAT54 D22, D23 2 3A, 60V Schottky diodes (SMB) Diodes B360B-13-F FSYNC 0 Not installed, test point JU1, JU2, JU6 3 3-pin headers JU7 1 4-pin header JU8, JU9 2 2-pin headers L7, L8 2 2.2H, 12A power inductors Vishay IHLP4040DZER2R2M01 PGOOD1, PGOOD2 2 Test points Q13-Q16 4 40V, 7.6A n-channel MOSFETs (8 SO) Fairchild FDS8449 R1, R2 2 1k 5% resistors (0603) R113, R114, R115, R117, R118, R122, R125, R126, R127, R129, R130, R134, R162, R166 14 0 5% resistors (0603) R116, R128 2 0.015 1%, 0.5W sense resistors (1206) Panasonic ERJ-8BWFR015V IRC LRF1206LF-01-R015-F R119, R120, R121, R131, R132, R133, R146, R147, R161, R165 0 Not installed, resistors (0603) R123 1 22.1k 1% resistor (0603) R124 1 1 5% resistor (0603) Maxim Integrated 4 Evaluates: MAX16932, MAX16933 MAX16932 Evaluation Kit Component List (continued) DESIGNATION QTY DESCRIPTION R135 1 14k 1% resistor (0603) R136 1 13.7k 1% resistor (0603) R137 1 100k 1% resistor (0603) R156, R157 2 51.1k 5% resistors (0603) DESIGNATION QTY DESCRIPTION U1 1 Automotive dual buck (28 TQFN-EP*) Maxim MAX16932ATIR/V+ -- 6 Shunts -- 1 PCB: MAX16932 EVKIT *EP = Exposed pad. Component Suppliers SUPPLIER PHONE WEBSITE Diodes, Inc. 805-446-4800 www.diodes.com Fairchild Semiconductor 888-522-5372 www.fairchildsemi.com IRC, Inc. 361-992-7900 www.irctt.com Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com Panasonic Corp. 800-344-2112 www.panasonic.com TDK Corp. 847-803-6100 www.component.tdk.com Vishay 402-563-6866 www.vishay.com Note: Indicate that you are using the MAX16932 when contacting these component suppliers. www.maximintegrated.com Maxim Integrated 5 MAX16932 Evaluation Kit Evaluates: MAX16932, MAX16933 Figure 1. MAX16932 EV Kit Schematic www.maximintegrated.com Maxim Integrated 6 Evaluates: MAX16932, MAX16933 MAX16932 Evaluation Kit 1 1 6 5 2 7 2 1 1 2 2 2 2 8 1 1 2 6 7 8 5 4 3 2 1 1 2 1 2 1 1 2 1 1 2 1 2 2 2 2 1 2 1 2 1 2 1 2 1 2 2 2 1 1 1 1 4 2 1 2 1 1 1 2 2 1 1 1 2 1 3 1 2 2 3 2 2 1 1 2 1 2 1 1 2 1 2 1 17 16 15 1 1 1 2 9 19 14 13 8 2 18 1 2 4 3 2 1 2 20 1 2 2 2 24 33 1 1 25 32 30 12 1 7 11 4 2 2 31 29 3 2 1 2 27 21 2 6 1 23 1 5 2 1 2 1 1 1 22 1 26 2 1 10 1 2 28 1 2 2 4 5 1 3 6 2 1 2 8 7 2 1 3 2 2 4 3 1 1 1 3 2 2 6 1 5 1 1 3 2 2 3 7 1 1 2 8 1 2 2 2 1 1 2 1 1 1 2 1 1.0" Figure 2. MAX16932 EV Kit Component Placement Guide--Component Side 1.0" Figure 3. MAX16932 EV Kit PCB Layout--Component Side www.maximintegrated.com Maxim Integrated 7 Evaluates: MAX16932, MAX16933 MAX16932 Evaluation Kit 1.0" Figure 4. MAX16932 EV Kit PCB Layout--Layer 2 1 2 2 1 2 1 2 2 2 1 1 2 1 2 4 1 2 1 1 1 2 2 1 1 2 2 1 2 1 1 1 1 3 1 2 2 2 3 2 1 1 2 1 2 1 1 2 1 33 29 2 32 30 1 31 2 1 1 1 2 3 1 2 1 1 2 3 2 1 1 1 2 1 1 2 2 1 2 2 1 1 2 1 1 1 1 2 1 2 2 2 2 2 1 1 2 1 1.0" Figure 5. MAX16932 EV Kit PCB Layout--Layer 3 www.maximintegrated.com Maxim Integrated 8 Evaluates: MAX16932, MAX16933 MAX16932 Evaluation Kit 1 1 6 5 2 7 2 1 1 2 2 2 2 8 1 1 2 6 7 8 5 4 3 2 1 1 2 1 2 2 1 1 1 1 1 2 1 2 2 2 2 1 2 1 2 2 1 1 1 2 2 2 1 1 2 4 2 1 2 1 1 1 2 2 1 1 1 1 3 1 1 2 2 2 2 2 2 3 2 2 1 1 2 1 2 1 1 2 1 9 17 16 15 1 1 1 1 19 14 13 8 2 18 1 2 4 3 2 1 1 2 20 1 2 2 2 24 33 1 1 25 32 30 12 1 2 2 7 11 4 2 31 29 3 2 1 21 2 6 1 27 1 5 2 23 1 10 1 1 1 22 2 1 26 1 2 28 1 2 2 4 5 1 3 6 2 1 2 8 7 2 1 3 2 2 4 3 1 1 1 3 2 2 6 1 5 1 1 3 2 2 3 7 1 1 2 8 1 2 2 2 1 1 2 1 1 1 2 1 1.0" Figure 6. MAX16932 EV Kit PCB Layout--Solder Side 1 2 1 2 1 2 2 2 1 1 1 2 4 1 2 2 1 2 2 1 1 2 1 1 1 2 2 1 1 2 1 1 1 3 1 1 1 2 3 2 1 2 2 1 1 2 1 33 29 2 32 30 2 2 31 2 1 1 1 1 2 3 1 2 1 1 2 3 1 1 1 2 2 1 2 2 1 1 2 2 1 2 2 1 1 1 1 1 2 2 2 2 2 1 1 2 1 1.0" Figure 7. MAX16932 EV Kit Component Placement Guide--Solder Side www.maximintegrated.com Maxim Integrated 9 MAX16932 Evaluation Kit Evaluates: MAX16932, MAX16933 Ordering Information PART MAX16932EVKIT# #Denotes RoHS compliant. www.maximintegrated.com TYPE EV Kit Maxim Integrated 10 MAX16932 Evaluation Kit Evaluates: MAX16932, MAX16933 Revision History REVISION NUMBER REVISION DATE 0 9/13 DESCRIPTION Initial release 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. 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